1. For the protection of single-phase 1.5 kW motor, a MCB of rating should be provided
(a)10 A
(b) 16 A
(c) 32 A
(d) 63 A
Answer : (b) 16 A
2. The low power factor results in
(a)Increased losses
(b) Decreased losses
(c) No effect on losses
(d) Better generating efficiency
Answer : (a)Increased losse
3. Low power factor
(a)Aids the voltage regulation
(b)Increase the voltage regulation
(c)Decrease the voltage regulation
(d)None of the above
Answer : (b)Increase the voltage regulation
4. The power factor of the AC supply can be improved by using
(a) Synchronous generator
(b) Universal motor
(c) Synchronous condenser
(d) SCR
Answer : (c) Synchronous condenser
5. zA distribution line of 440 V is classified as
(a) LV
(b) MV
(c) HV
(d) EHV
Answer : (b) MV
6. Which of the following is not used as a overhead conductor
(a) ACSR
(b) Weasel
( c )PILCA
(d) Zebra
Answer : ( c )PILCA
7. Which of the following reduces the power factor
(a) Motor on no load
(b) Tube lights
(c) Fans
(d) All of the above
Answer : (d) All of the above
8. Under high voltage test cable shall withstand an AC voltage of
(a) 1.5 kV
(b) 3 kV
(c) 5.2 kV
(d) 7.2 kV
Answer : (b) 3 kV
9. Under high voltage test cable shall withstand a DC voltage of
(a) 1.5 kV
(b) 3 kV
(c) 5.2 kV
(d) 7.2 kV
Answer : (d) 7.2 kV
10. Under water immersion test cable is immersed in a water bath at
(a) 40 deg C
(b) 50 deg C
(c) 60 deg C
(d) 70 deg C
Answer : (c) 60 deg C
11. For water immersion test, cable is immersed in hot water at specified temperature, after 24 hrs the voltage applied between conductor and water for five minutes is
(a) 3 kV
(b) 4 kV
(c) 5 kV
(d) 6 kV
Answer : (d) 6 kV
12. Unit of energy is
(a) Kilo volt hours
(b) Kilo watt hours
(c) Kilo watt
Answer : (b) Kilo watt hours
13. As per Ohm’s law
(a) V = IR
b) V = I/R
c) R = VxI
Answer : b) V = I/R
14. Unit of resistance is
(a) Ampere
b) Volts
c) Ohm
d) none of the above
Answer : c) Ohm
15. In three phase 415 volts 50 Hz supply, the phase to phase voltage is
(a) 220 Volts
b) 415 volts
c) 440 volts
Answer : b) 415 volts
16. In three phase 415 volts 50 Hz supply, the phase to neutral voltage is
(a) 220 volts
(b) 230 volts
(c) 440 volts
Answer : (b) 230 volts
17. In 4 sq. mm PVC wire, 4 sq. mm stand for\
(a) Thickness of wire
(b) Length of wire
(c) The area of thickness of wire
Answer : (c) The area of thickness of wire
18. The instrument to measure the light is called
(a) Tong tester
(b) Lux meter
(c) Micro meter
Answer : (b) Lux meter
19. 10 hours use of 500 watt lamp will consume the energy
(a) 10 units
(b) 20 units
(c) 5 units
Answer : (c) 5 units
20. No. of poles in MCB/TPN is
(a) 2 poles
(b) 4 poles
(c) 3 poles
Answer : (b) 4 poles
21. A.C. is converted into D.C. by
(a) Dynamo
(b) Motor.
(c) Transformer
(d) Rectifier
Answer : (d) Rectifier
22. Farad is a unit of
(a) Flux
(b) Capacitance
(c) Mutual inductance
(d) Resistance of a conductor
Answer : (b) Capacitance
23. A kilowatt-hour is a unit of
(a) Energy
(b) Electrical potential
(c) Power
(d) Electric current
Answer : (a) Energy
24. An electric lamp is marked 100 watt. It is working on 200 Volts. The current through the lamp is given as
a) 0.5 Amp.
(b) 0.2 Amp.
(c) 5.0 Amp.
(d)1.0 Amp.
Answer : a) 0.5 Amp.
25. Before carrying out O/H maintenance following is due
a) Transformer is switched off
b) DG set is switched off
c) HT panel is switched off
d) Respective O/H feeder is switched off or earthed
Answer : d) Respective O/H feeder is switched off or earthed
26. In house wiring the red wire indicates the
a) Phase
(b) Neutral
(c) Earth wire
(d) Dead wire.
Answer : a) Phase
27. In house wiring the black wire indicates the
a) Phase
(b) Neutral
(c) Earth wire
(d) Dead wire
Answer : (b) Neutral
28. In house wiring the green wire indicates the
a) Phase
(b) Neutral
(c) Earth wire
(d) Dead wire.
Answer : (c) Earth wire
29. In 4 wire electric circuit, the black conductor is used for
a) Phase
(b) Neutral
(c) Earth wire
(d) Armour
Answer :(b) Neutral
30. In cabling system the earth is connected with conductor having colour
a) Red
(b) blue
(c) yellow
(d) Armour
Answer : (d) Armour
31. Unit of current is [ b ]
a) Watt
(b) Ampere
(c) Volt
(d) ohm
Answer : (b) Ampere
32. Heater element is made up of [ b ]
a) Tin
(b) Nichrome
(c) Silver
(d) Any above
Answer : (b) Nichrome
33. Filament of incandescent lamp is made of [ c ]
a) Tin
(b) Nichrome
(c) Tungusten
(d) Silver
Answer : (c) Tungusten
34. An insulator should have [a ]
a) High resistance
(b) High conductance
(c) High conductivity
(d) All of the above
Answer : a) High resistance
a) Solder
(b) PG clamp
(c) Thimbles
(d) All above
Answer : (d) All above
36. Instrument used for measuring the speed of rotating machines/ [ b ]
appliances is
a) Lux meter
(b) Tachometer
(c) Micrometer
(d) None above
Answer :(b) Tachometer
37. Instrument used for measuring the thickness of wire/strip is [ c ]
a) Lux meter
(b) Tachometer
(c) Micrometer
(d) None above
Answer :(c) Micrometer
38. Instrument used for measuring the voltage across a circuit is [ b ]
a) Ammeter
(b) voltmeter
(c) Thermometer
(d) None above
Answer :(b) voltmeter
39. Instrument used for measuring the current is [ a ]
a) Ammeter
(b) voltmeter
(c) Thermometer
(d) None above
Answer :a) Ammeter
a) Ammeter
(b) voltmeter
(c) Thermometer
(d) None above
Answer :(c) Thermometer
41. Illumination level is measured in terms of [ a ]
a) Lux
(b) Volt
(c) Ampere
(d) Ohm
Answer : a) Lux
42. Insulating resistance is measured by using [ b ]
a) Multimeter
(b) Insulation Megger
(c) Voltmeter
(d) Hydrometer
Answer : (b) Insulation Megger
43. Which of the following is used for rectification of AC supply [ a ]
a) Diodes
(b) Transistors
(c) Capacitor
(d) Resistors
Answer :a) Diodes
44. Which preparation should be done starting a new wiring [ a ]
a) Prepare a wiring diagram
(b) Prepare for shock treatment
(c) Both a & b
(d) None of the above
Answer :a) Prepare a wiring diagram
45. In wiring circuit the fuse will be placed on [ a ]
(a) Phase
(b) Neutral
(c) Earth
(d) Any of the above
Answer :(a) Phase
46. Which of the following tests should be done before connecting a wiring to the main line [a]
(a) IR test
(b) Continuity test
(c) Polarity test
(d) Any above
Answer : (a) IR test
47. Which of the following is a common wiring fault [ d ]
(a) Short circuit
(b) Open circuit
(c) Fuse blown
(d) All above
Answer :(d) All above
48. Wattage rating range of electric kettle is [ b ]
(a) 50-500 W
(b) 350-1000 W
(c) 1000-1500 W
(d) 1200-1600 W
Answer : (b) 350-1000 W
49. Device used for auto off an electric iron is [ a ]
(a) Thermostat switch
(b) Overload relay
(c) Time delay switch
(d) Any of the above
Answer :(a) Thermostat switch
50. Can you repair an immersion rod [ a ]
(a) No
(b) Yes
(c) It depend on condition
(d) None above.
Answer :(a) No
(a) Wire
(b) cable
(c) OH conductor
(d) Any above
Answer :(a) Wire
52. To improve the power factor, capacitors are connected in the circuit as
(a) Parallel path
(b) Series path
(c) Any of a & b
(d) None of the above
Answer : (a) Parallel path
53. To switch ON or switch OFF the supply in accordance with day light, following is used
(a) Light dependent resistor
(b) Light emitting diode
(c) Any of a & b
(d) None of the above
Answer :(a) Light dependent resistor
54 In order to draw more current from the electric source
(a) Resistors are connected in parallel
(b) Resistors are connected in series
(c) Resistors are connected in series and parallel
(d) None of the above.
Answer :(a) Resistors are connected in parallel
55. If a 60 W and 100 W lamps in series and are connected to a source of supply, which lamp will give more light
(a) 100 W
(b) 60 W
(c) Both will give same light
(d) None of the bulb will glow.
Answer : (b) 60 W
56 Power is defined as
(a) Capacity of doing work
(b) Rate of doing work
(c) Product of force and distance
(d) Energy dissipated by load.
Answer :(b) Rate of doing work
57 Unit of electric Energy is
(a) Kilowatt
(b) watt
(c) Kilowatt hour
(d) watt hour
Answer : (c) Kilowatt hour
58 The internal resistance of battery is increased by
(a) Increase in no. of cells
(b) Decrease in no. of cells
(c) None of the above
(d) Both a and b
Answer :(a) Increase in no. of cells
59 A generators converts
(a) Mechanical energy into light
(b) Electrical energy to mechanical energy
(c) Mechanical energy to electrical energy
(d) None of the above
Answer : (a) Mechanical energy into light
60 Power factor of AC circuit is equal to
(a) Tan of phase angle
(b) Sine of phase angle
(c) Cosine of phase angle
(d) None of the above
Answer :(a) Tan of phase angle
61 Resistance of open circuit is equal to
(a) Zero
(b) Infinity
(c) Less than 1 ohm
(d) None above
Answer :(b) Infinity
62 Laminated core is used to reduce
(a) Hysteresis loss
(b) Eddy current loss
(c) Copper loss `
(d) iron loss
Answer :(b) Eddy current loss
63 Which of the following is not a non conventional energy source [ d ]
(a) Solar
(b) Bio gas
(c) Wind
(d) Electricity
Answer :(d) Electricity
64 Solar energy is used for
(a) Lighting
(b) Cooking
(c) Battery charging
(d) All above
Answer :(d) All above
65 Solar and wind hybrid system is [ a ]
(a) Becoming popular
(b) Not possible
(c) Conventional energy source
(d) None of the above
Answer :(a) Becoming popular
66 Bio gas depends on [ b ]
(a) Electrical energy
(b) Waste products
(c) Both a and b
(d) None of the above
Answer :(b) Waste products
67 Which of the following is not a constituent of a solar lighting system [ d ]
(a) Photo voltaic cell
(b) Back up batteries
(c) Charger
(d) Earth wire.
Answer :(d) Earth wire.
68 Which of the following is not a type of fuse [ c ]
(a) HRC
(b) Rewirable
(c) Ceramic
(d) None above.
Answer :(c) Ceramic
69 Which of the following is not a type of generating station? [ d ]
(a) Thermal
(b) Nuclear
(c) Hydro
(d) Atmospheric
Answer :(d) Atmospheric
70 Which of the following is not a part of overhead distribution line [ d ]
(a) Conductor
(b) Insulator
(c) Cross arms
(d) Thimbles
Answer : (d) Thimbles
71 Type of insulator not used in a 3 phase, 440 V overhead distribution line [ c ]
(a) Pin
(b) Shackle
(c) Disc
(d) None above
Answer : (c) Disc
72 Instrument connected in the circuit with the ammeter (in panel) to facilitate the measurement of current is [ a ]
(a) Current transformer
(b) Potential transformer
(c) Excitation transformer
(d) None of the above
Answer :(a) Current transformer
73 Capacitor opposes [ a ]
(a) Instantaneous change of voltage
(b) Instantaneous change of current
(c) Instantaneous change in resistance
(d) None of the above
Answer : (a) Instantaneous change of voltage
74 Induct or opposes [ b ]
(a) Instantaneous change of voltage
(b) Instantaneous change of current
(c) Instantaneous change in resistance
(d) None of the above
Answer : (b) Instantaneous change of current
75 Current is [ a ]
(a) Rate of flow of charge
(b) Gradual change in resistance
(c) Linear change in capacitance
(d) None of the above.
Answer : (a) Rate of flow of charge
76 When resistances are connected in parallel, the equivalent resistance [ a ]
(a) Decreases
(b) Increases
(c) No change
(d) May increase or decrease
Answer :(a) Decreases
77 When resistances are connected in series, the equivalent resistance [ b ]
(a) Decreases
(b) Increases
(c) No change
(d) May increase or decrease
Answer :(b) Increases
78 Diode allows the flow of the current [ a ]
(a) In one direction
(b) In both the directions
(c) Flow of current not allowed
(d) None of the above.
Answer :(a) In one direction
79 When capacitance are connected in parallel, the equivalent capacitance [ b ]
(a) Decreases
(b) Increases
(c) no change
(d) May increase or decrease
Answer :(b) Increases
(a) Decreases
(b) Increases
(c) No change
(d) May increase or decrease
Answer :(a) Decreases
81 Two lamps of 60 W and one of 100 W are connected in series to a supply 220 V, the current flowing in the circuit will be [ a ]
(a) 1A
(b) 2A
(c) 3A
(d) 4A
Answer :(a) 1A
82 A 2 x 40 W box type fitting glows for 10 hrs in a day, units consumed per day will be [ c ]
(a) 0.72
(b) 0.04
(c) 0.8
(d) 1
Answer : (c) 0.8
83 A 2 x 40 W box type fitting glows for 10 hrs in a day, electric charges for the month of June @ Rs. 3/- per unit will be Rs.
(a) 18
(b) 3.60
(c) 72
(d) 90
Answer :(c) 72
(a) 0.72
(b) 0.04
(c) 0.8
(d) 1
Answer :(a) 0.72
85 One ordinary ceiling fan works for 12 hrs in a day, electric charges per day @ Rs. 2/- per unit will be
(a) 0.72
(b) 1.44
(c) 0.8
(d) 1
Answer :(c) 0.8
86 One 20 inch desert cooler (150 W) works for 8 hrs per day, units consumed per day will be
(a) 1.2
(b) 1.8
(c) 2.1
(d) 2.4
Answer :(a) 1.2
87 One 20 inch desert cooler (150 W) works for 8 hrs per day, electric charges gor the month of July @ Rs. 3/- per unit will be
(a) 111. 6
(b) 110.2
(c) 90
(d) 115.3
Answer :(a) 111. 6
(a) 540
(b) 480
(c) 620
(d) 700
Answer :(a) 540
(a) 1.8
(b) 2.1
(c) 1.7
(d) 3
Answer :(a) 1.8
90 A 10 hp pump works for 10 hrs per day, monthly consumption will be
(a) 223.8
(b) 2.23
(c) 22.38
(d) 2238
Answer :(a) 223.8
(a) 5.490
(b) 6.714
(c) 2388
(d) 1940
Answer :(b) 6.714
(a) 0.5 W
(b) 1 W
(c) 5 W
(d) 50 W
Answer :(b) 1 W
93 The resistance of human body lies between
(a) 100-200 ohm
(b) 5 K ohm-50 K ohm
(c) 1 M ohm-10 M ohm
(d) 100 k ohm-500 K ohm
Answer :(d) 100 k ohm-500 K ohm
94 Instrument used to measure electric energy consumption is [ c ]
(a) Galvanometer
(b) Potentiate
(c) Energy meter
(d) None of the above
Answer :(c) Energy meter
95 Which of the following keeps the poles straight [ a ]
(a) Stay rod
(b) Cross arm
(c) Conductor
(d) Insulator
Answer :(a) Stay rod
96 Inside the geyser there is a [ b ]
(a) Filament
(b) Immersion rod
(c) Any of a & b
(d) None of the above
Answer :(b) Immersion rod
97 Which of the following is used for concealed wiring in a house [ a ]
(a) PVC conduit
(b) GI pipe
(c) Spun concrete pipe
(d) Any of the above.
Answer :(a) PVC conduit
98 The size of copper wire used for point wiring in sq mm is [ a ]
(a) 1.5
(b) 2.5
(c) 4
(d) 10
Answer :(a) 1.5
99 The size of copper wire used for sub main in sq mm is [ b ]
(a) 1.5
(b) 2.5
(c) 4
(d) 10
Answer :(b) 2.5
100 The size of Aluminium wire used for point wiring in sq mm is [ c ]
(a) 1.5
(b) 2.5
(c) 4
(d) 10
Answer :(c) 4
101 The combined Earth resistance of 33kV/11 kV receiving station should not exceed [a ]
(a) 1 ohm
(b) 2 ohms
(c) 10 ohms
(d) 20 ohms
Answer :(a) 1 ohm
102 The combined earth resistance of 11 kV/415 V Sub-station should not exceed [ b ]
(a) 0.5 ohm
(b) 2 ohms
(c) 10 ohms
(d) 20 ohms
Answer :(b) 2 ohms
103 The integration time employed by supply authorities for recording M.D. for a 33 kV/415 V, 10 MVA Sub-station is –
(a) 5 minutes
(b) 15 minutes
(c) 45 minutes
(d) 60 minutes
Answer :(b) 15 minutes
104 While designing a sub-station anticipated future loads in the next … years are taken [d ]
(a) 1 year
(b) 2 years
(c) 20 years
(d) 5-7 years
Answer :(d) 5-7 years
105 As per the present Tariff the minimum power factor of sub-station should be [ d ]
(a) 0.8
(b) 0.85
(c) 0.90
(d)0.95
Answer : (d)0.95
106 The minimum clearance of lowest conductor from the ground of 33 kV [ c ] lines, across the road.
(a) 3 M
(b) 4 M
(c) 6.1 M
(d) 14 M
Answer : (c) 6.1 M
107 The minimum clearance of lowest conductor from the ground [ a] of 33 kV lines, along a street.
(a) 5.8 M
(b) 3.0 M
( c ) 4.0 M
(d) 14 M
Answer : (a) 5.8 M
(a) 2.0 M
(b) 10.M
(c) 3.7 M
(d) 6.0 M
Answer : (c) 3.7 M
109. The minimum Horizontal clearance of 11 kV lines from any buildings. [ b ]
(a) 1.2 M
(b) 3.7 M
(c) 6.1 M
(d) 10 M
Answer : (b) 3.7 M
110. The Visible, Audible, Partial discharge at the surface of conductor at high [ b ] voltage is called –
(a) Skin affect
(b) Corona
(c) Creep
(d) None of these
Answer :(b) Corona
111. For maintaining power supply quantity the frequency variation of [ b ] power supply are restricted to
(a) ± 1 %
(b) ± 3 %
(c) ± 0.5%
(d) ± 10%
Answer :(b) ± 3 %
112. The 3 phase voltage unbalance in supply should not exceed
(a) 2.5.% to 5%
(b) 20%
(c) 25%
(d) 10%
Answer :(a) 2.5.% to 5%
113. For maintaining power supply quality the rate of change of frequency should not exceed.
(a) 5 Hz
(b) 10 HZ
(c) 1 HZ
(d) 3 Hz
Answer :(c) 1 HZ
114. In Thermal Power plants the generator used are [ b ]
(a) AC 3 Ø, Induction Generators.
(b) AC 3 Ø, Synchronous Generators.
(c) D.C. Shunt Generators.
(d) AC 1 Ø Synchronous Generators.
Answer :(b) AC 3 Ø, Synchronous Generators.
115. The highest system voltage of normal 33 kV System for the purpose [ b ] of design of equipments is
(a) 30 kV.
(b) 36 kV.
(c) 33 kV.
(d) 66 kV.
Answer :(b) 36 kV.
116. The Rod gap on the L.V.side of 11 kV/415, 250 kVA Transformer is [ d ]
(a) 300 mm.
(b) 100 mm.
(c) 50 mm.
(d) Rod gap L.A. is not provided for LV side of Transformer.
Answer :(d) Rod gap L.A. is not provided for LV side of Transformer.
117. The rated voltage of L.A. for 11 kV/415V Transformer Protection is [ c ]
(a) 11 kV.
(b) 12 kV.
(c) 9 kV.
(d) 24 kV.
Answer :(c) 9 kV.
118. For medium sized 11 kV/415 v, 500 kVA Transformer sub-station, the type of L.A. used are
(a) Station type.
(b) Line type.
(c) Distribution type.
(d) None of these.
Answer :(b) Line type.
119. The line type L.A. used for our 11 kV and 33 kV Sub-station are having a standard [a ] normal discharge current (Peak).
(a) 5 KA.
(b) 10 KA.
(c) 1.5 KA.
(d) 2.5 KA.
Answer :(a) 5 KA.
120. The span of supports for 11 kV over head lines should not exceed. [ b]
(a) 100 m.
(b) 65 m.
(c) 30 m.
(d) 27 m.
Answer :(b) 65 m.
121. The testing of relays should be performed at a interval of [ b ]
(a) 6 months
(b) 12 months
(c) 18 months
(d) 24 months
Answer :(b) 12 months
122. If any live conductor in the circuit is entangled with tree branch ______ operates. [ a]
(a) EFR
(b) OVR
(c) OLR
(d) Thermal relay
Answer :(a) EFR
123. _______ relay operates if there is a heavy increase in load current. [ c]
(a) EFR
(b) OVR
(c) OLR
(d) Thermal relay
Answer :(c) OLR
124. _______ relay indicates the temperature rise of a transformer. [d]
(a) EFR
(b) OVR
(c) OLR
(d) Thermal relay
Answer :(d) Thermal relay
125. If the relay setting of 60/5 CT is at 3.75, then the tripping will be at [ b]
(a) 60 Amp.
(b) 45 Amp.
(c) 30 Amp.
(d) 50 Amp
Answer :(b) 45 Amp.
126. The normal SPG of electrolyte of lead acid battery should be [ c ]
(a) 1.160
(b) 1.180
(c) 1.220
(d) 1.240
Answer :(c) 1.220
127. The terminal voltage of a fully charged lead acid cell is [ c ]
(a) 1.8 V
(b) 2.0 V
(c) 2.2 V
(d) 2.4 V
Answer :(c) 2.2 V
128. The terminal voltage of a lead acid cell should not fall below [ b ]
(a) 1.6 V
(b) 1.8 V
(c) 2.0 V
(d) 2.2 V
Answer :(b) 1.8 V
129. The normal charging rate of 120 AH lead acid battery set is [c]
(a) 4 A
(b) 8 A
(c) 12 A
(d) 16 A
Answer :(c) 12 A
130. The ratio of distil water and acid used to prepare new electrolyte for lead acid cell is [ d ]
(a) 1 : 1
(b) 2 : 1
(c) 3 : 1
(d) 4 : 1
Answer : (d) 4 : 1
131. Following law is applicable in the working of lead acid cell [ c ]
(a) Faradays law of self induction.
(b) Faradays law of mutual induction
(c) Faradays law of electrolysis.
(d)Newton’s law of motion.
Answer : (c) Faradays law of electrolysis.
132. The capacity of storage battery is expressed as [ d ]
(a) No. of recharges it can take
(b) Time for which it can be used
(c) No. of cells it contain
(d) Ampere hour it can deliver.
Answer :(d) Ampere hour it can deliver.
133. Sedimentation in lead acid cell occurs due to [ a ]
(a) Overcharging at high rate.
(b) Slow charging at low rate.
(c) Over discharge at low rate.
(d) Non-utilization for long periods.
Answer :(a) Overcharging at high rate.
134. Even when not in use, a lead acid battery should be recharged once in [ a ]
(a) Six week
(b) Six days
(c) Three months
(d) Six months.
Answer : (a) Six week
135. First step to be carried out before starting work starting work on faulty portion of overhead line is to[ b ]
(a) Earth the line on both the ends of the portion
(b)Obtain the permit to work
(c ) Bring ladder or crane
(d) Climb on the pole immediately
Answer :(b)Obtain the permit to work
136. Before starting the work on faulty circuit it should be ensured that [ a ]
(a)The faulty portion has been isolated from the power supply
(b)The worker is strong enough to climb the pole
(c) The cable is not deep enough to dig
(d) None of the above.
Answer :(a)The faulty portion has been isolated from the power supply
137. The electric overhead line on which work is to be carried out should be necessarily
earthed on both the ends to [ c ]
(a) Dispense the charge stored between the conductors due to capacitive effect
(b) To bring the line at zero potential
(c) Both a & b
(d) None of the above
Answer :(c) Both a & b
138. One can protect himself from electric shock while working on live circuit by wearing
gloves of good[ b ]
(a) Conducting material
(b) Insulating material
(c) Semiconductor material
(d) Any of the above.
Answer :(b) Insulating material
139. Which of the following are principal safety precautions [ d ]
(a) Don’t touch live wire or equipment with bare hands
(b) Before switching on supplysee no one is working in the line
(c) Use rubber gloves and meeting.
(d) All of the above.
Answer :(d) All of the above.
140. Which of the following is most effective method of artificial respiration [ a ]
(a) Mouth to mouth air pumping method
(b) To use bicycle air pump
(c) Both a & b
(d) None of the above
Answer :(a) Mouth to mouth air pumping method
141. Which material is recommended as fire extinguisher in electrical cases [ b ]
(a) Carbon tetra chloride
(b) Carbon dioxide
(c) Sulphur hexafluoride
(d) Any of the above
Answer :(b) Carbon dioxide
142. Which of the following is to be necessarily kept in a electric substation [ d ]
(a) First aid box
(b) Stretcher
(c) Earthing rod
(d) All of the above
Answer :(d) All of the above
143. The warning board to be provided, on the switch of the line on which work is going on [a]
(a) Men at working
(b) Danger
(c) Keep away
(d) None of the above
Answer :(a) Men at working
144. Staff competent to work on overhead line of MV should be [ c ]
(a) Unskilled
(b) Semi skilled
(c) Highly skilled
(d) Any of the above
Answer :(c) Highly skilled
145. Which of the following is a renewable source of energy? [ d ]
a) coal
b) oil
c) Natural gas
d) Solar
Answer :d) Solar
146. The law of conservation of energy states that energy [ d ]
a) can be created and destroyed
b) is destroyed in the process of burning
c) cannot be converted from one
d) is neither destroyed nor created; But can be transform from one form to another form
Answer :d) is neither destroyed nor created; But can be transform from one form to another form
147. Absolute pressure is [ c ]
a) Gauge Pressure
b) Atmospheric Pressure
c) Gauge pressure + Atmospheric Pressure
d) Gauge Pressure – Atmospheric Pressure
Answer :c) Gauge pressure + Atmospheric Pressure
148. 100 kCals expressed as kilojoules would be [ a ]
a) 418.7 kJ
b) 4.187 Joules
c) 4.187 kJ
d) 41.87 kJ
Answer :a) 418.7 kJ
149. When heat flows from one place to another by means of a liquid or gas, it is being
transferred by [ d ]
a) radiation
b) conduction
c) sublimation
d) convection
Answer :d) convection
150. How many watts are in a hp? [ d ]
a) 700
b) 725
c) 740
d) 746
Answer :d) 746
151. The characteristic of an electrical circuit that forces current to flow is [ d ]
a) watts
b) amps
c) ohms
d) volts
Answer :d) volts
152. Voltage and resistance in an electrical circuit are related by Ohm's law [ d ] and determine
a) resistance
b) voltage
c) the type of circuit
d) current
Answer :d) current
153. The characteristic of an electrical circuit that opposes current flow is [ a ]
a) resistance
b) voltage
c) friction
d) power
Answer :a) resistance
154. The instrument used to measure RPM is [ d ]
a) Fyrite
b) Pyrometer
c) Ultrasonic flow meter
d) Stroboscope
Answer :d) Stroboscope
155. Which of the following terms does not refer to specific energy consumption [ d ]
a) Kwh/ton
b) kcal/kL
c) kJ/kg
d) kg
Answer :d) kg
156. Which of the following will not motivate the employees for energy conservation ? [ d ]
a) Incentive
b) Recognition
c) Reward
d) Threatening
Answer :d) Threatening
157. The heat input required for generating ‘one’ kilo watt-hour of electrical output is
called as ___. [ b ]
a) Efficiency
b) Heat Rate
c) Calorific Value
d) Heat value
Answer :b) Heat Rate
158. Which of the voltage is not available for Indian distribution system? [ c ]
a) 33 kV
b) 11 kV
c) 280 V
d) 433 V
Answer :c) 280 V
159. The power loss in transmission/distribution line depends on ____. [ d ]
a) Current in the line
b) Resistance of the line
c) Length of the line
d) All
Answer :d) All
160. If distribution of power is raised from 11 kV to 66 kV, the voltage drop would [ b ] lower by
a) 6 times
b) 1/6 times
c) 36 times
d) 1/36 times
Answer :b) 1/6 times
161. If the distribution voltage is raised from 11 kV to 33 kV, the line loss would be: [ a]
a) Less by 1/9
b) More by 9 times
c) No change
d) None of the above
Answer :a) Less by 1/9
162. The maximum demand of an industry, if trivector motor records 3600 KVA for 15 minutes and 3000 kVA for next 15 minutes over a recording cycle of 30 min is_____.
a) 3600 kVA
b) 3000 kVA
c) 3300 kVA
d) 600 kVA
Answer :c) 3300 kVA
163. Presenting the load demand of a consumer against time of the day is known as___. [ b ]
a) Time Curve
b) Load curve
c) Demand curve
d) Energy curve
Answer :b) Load curve
164. The vector sum of active power and reactive power required is ____. [ a ]
a) Apparent Power
b) Power Factor
c) Load Factor
d) Maximum Demand
Answer :a) Apparent Power
165. Power factor is the ratio of ____ and apparent power. [ a ]
a) Active power
b) Reactive power
c) Load Factor
d) Maximum Demand
Answer :a) Active power
166. The kVAr rating required for improving the power factor of a load operating at [ a ] 500 kW and 0.85 power factor to 0.95 is ________.
a) 145 kVAr
b) 500 kVAr
c) 50 kVAr
d) 100 kVAr
Answer :a) 145 kVAr
167. The rating of the capacitor at motor terminals should not be greater than _____ . [ b ]
a) magnetizing kVAr of the motor at full load
b) magnetizing kVAr of the motor at no load
c) magnetizing kVAr of the motor at half load
d) magnetizing kVAr of the motor at 75% load
Answer :b) magnetizing kVAr of the motor at no load
168. The percentage reduction in distribution loses when tail end power factor raised from 0.8 to 0.95 is ________. [ a ]
a) 29%
b) 15.8%
c) 71%
d) 84%
Answer :a) 29%
169. If voltage applied to a 415 V rated capacitors drops by 10%, its VAR output [ c ] drops by ____.
a) 23%
b) 87%
c) 19%
d) 10%
Answer :c) 19%
170. The ratio between the number of turns on the primary to the turns on the [ a ] secondary of a transformer is know as:
a) turns ratio
b) efficiency
c) winding factor
d) power factor
Answer : a) turns ratio
171. The ratio of overall maximum demand of the plant to the sum of individual [ b ] maximum demand of various equipment is ______.
a) load factor
b) diversity Factor
c) demand Factor
d) maximum demand
Answer : b) diversity Factor
172. Core losses in transformer are caused by ______. [ c ]
a) Hysteresis loss
b) Eddy current loss
c) both a & b d) None
Answer :c) both a & b d) None
173. The load losses in transformer vary according to ________. [ b]
a) Loading of transformer
b) Square of loading of transformer
c) Cube of loading of transformer
d) None
Answer :b) Square of loading of transformer
174. The total losses in a transformer operating at 50% load with designed no load and load losses at 2 kW and 20 kW respectively are _______. [ a ]
a) 7 kW
b) 12 kW
c) 4.5 kW
d) 22 kW
Answer :a) 7 kW
175. The total amount of harmonics present in the system is expressed using ___. [ c ]
a) Total Harmonic Factor
b) Total Harmonic Ratio
c) Total Harmonic Distortion
d) Crest Factor
Answer :c) Total Harmonic Distortion
176. The 5th and 7th harmonic in a 50 Hz power environment will have: [ c ]
a) voltage and current distortions with 55 Hz & 57 Hz
b) voltage and current distortions with 500 Hz & 700 Hz
c) voltage and current distortions with 250 Hz & 350 Hz
d) no voltage and current distortion at all
Answer : c) voltage and current distortions with 250 Hz & 350 Hz
177. The type of energy possessed by the charged capacitor is [ b ]
a) Kinetic energy
b) Electrostatic Potential
d) Magnetic
Answer : b) Electrostatic Potential
178. The energy stored in the bonds of atoms and molecules is called [ b ]
a) Kinetic energy
b) Chemical energy
c) Potential energy
d) Magnetic energy
Answer : b) Chemical energy
179. Active power consumption of motive drives can be determined by using one of the following relations. [ d ]
a) √3 x V x I
b) √3 x V2 x I x cosϕ
c) √3 x V x I2x Cosϕ
d) √3 x V x I x Cosϕ
Answer : b) √3 x V2 x I x cosϕ
180. The grade of energy can be classified as low, high, extra ordinary. In case of [ c ] electrical energy it would fall under ____ category. (EM/EA)
a) low grade
b) extra ordinary grade
c) high grade
d) none of the above
Answer : c) high grade
181. The portion of apparent power that doesn’t do any work is termed as [ c ]
a) Apparent power
b) Active power
c) Reactive Power
d) None of the above
Answer : c) Reactive Power
182. Power factor (PF) is the ratio of (EM/EA) [ c ]
a) Apparent power & Active power
b) Active power & Reactive power
c) Active Power & Apparent power
d) Apparent power & Reactive power
Answer : c) Active Power & Apparent power
183. kVA is also called as [ b ]
a) reactive power
b) apparent power
c) active power
d) captive power
Answer : c) active power
184. The energy consumed by a 50 kW motor loaded at 40 kW over a period of 4 hours is[ b ]
a. 50 kWh
b) 160 kWh
c) 40 kWh
d) 2000 kWh
Answer : b) 160 kWh
185. The ratio of maximum demand to the connected load is termed as [ b]
a) Load factor
b) Demand factor
c) Contract demand
d) none of the above
Answer : b) Demand factor
186. A single phase induction motor is drawing 10 amps at 230 volts. If the operating power factor of the motor is 0.9, then the power drawn by the motor is [ c ]
a) 2.3 kW
b) 3.58 kW
c) 2.07 kW
d) 2.70 kW
Answer : c) 2.07 kW
187. The quantity of heat required to raise the temperature of 1 gram of water by 1 OC is termed as[ c ]
a) Specific heat
b) Heat capacity
c) One Calorie
d) Sensible heat
Answer : c) One Calorie
188. Nameplate kW or HP rating of a motor indicates [ b ]
a) input kW to the motor
b) output kW of the motor
c) minimum input kW to the motor
d) maximum input kW to the motor
Answer : b) output kW of the motor
189. The quantity of heat required to change 1 kg of the substance from liquid to vapor state without change of temperature is termed as [ b ]
a) Latent heat of fusion
b) Latent heat of vaporization
c) Heat capacity
d) Sensible heat
Answer : b) Latent heat of vaporization
190. The latent heat of condensation of 1 kg of steam at 100 °C to form water at 100 °C, it gives out the heat of [ b ]
a) 580 kCal
b) 540 kCal
c) 620 kCal
d) 2260 kCal
Answer : b) 540 kCal
191. The specific heat of ____ is very high compared to other common substances listed below [ c ].
a) Lead
b) Mercury
c) Water
d) Alcohol
Answer : c) Water
192. The property of viscosity of liquid fuels: [ c ]
a) decreases with decreasing temperature
b) increases with increasing temperature
c) decreases with increasing temperature
d) increases with decreasing temperature
Answer : c) decreases with increasing temperature
193. The quantity of heat Q, supplied to a substance to increase its temperature depends upon the following. [ c ]
a) sensible heat added
b) latent heat of fusion
c) specific heat of the substance
d) heat capacity
Answer : c) specific heat of the substance
194. Unit of specific heat in SI system is_________. [ c ]
a) joule /kg °C
b) kg/cm2
c) kcal/m3
d) kcal/cm2
Answer : c) kcal/m3
195. The change by which any substance is converted from a gaseous state to liquid state is termed as
----- [ a ]
a) condensation
b) Evaporation
c) Fusion
d) Phase change
Answer : a) condensation
196. The method of producing power by utilizing steam generated for process in the boiler is termed as ----- [ b ]
a) Extraction
b) Co generation
c) Both a & b
d) Neither a nor b
Answer : b) Co generation
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