The ratio of primary and secondary turns in a transformer is 1:200. If 200 Volt AC is fed to primary, voltage across secondary will be
a) 44 V
b) 220 V
c) 220/220 V
d) 44 KV
Q. A.C. is converted into D.C. by
a) Dynamo
b) Motor.
c) Transformer
d) Rectifier
Q. Farad is a unit of
a) Flux
b) Capacitance
c) Mutual inductance
d) Resistance of a conductor
Q. Two bulbs, 100 Watt and 200 Watt are placed in a series and 440 volts applied across them
a) Both the lamp will fuse
b) Neither of the lamp will fuse
c) Only 100 watt lamp will fuse
Q. Priming is required for
a) HS Pump
b) VS Pump
c) Submersible Pump
Q. A 5 HP pump set draws current on full load
a) 5 A
b) 10 A
c) 7.5 A
d) 6 A
Q. Automation of pump set is done to
a) To limit the working of pumps
b) To avoid the working of water
c) To save the electrical energy
d) To reduce the man power
e) All of the above.
Q. The following fuel is used in 70 KVA DG set
a) K. Oil
b) Petrol
c) High speed DSL oil
d) LPG
Q. Lub. oil pressure of DG set is maintained upto
a) 1.5 Kg./CM
b) 3.0 Kg./CM
c) 4.0 Kg./CM
d) 7.0 Kg./CM
a) None of the above
Q. Mono block submersible pump set is installed in
a) Deep tube well bore
b) Shallow tube well bore
c) Under ground tank
d) Sewage line
Q. The presence of moisture in refrigeration system
a) Increases the head pressure
b) Deposit of ice on expansion valve
c) Increase of suction pressure
Q. Who is largest run scorer in Indian cricket ?
a. Sunil Gavaskar
b. Mohd. Azharuddin
c. Sachin Tendulkar
d. Kapil Dev
Leander paes is associated with?
Cricket
Badminton
Table tennis
Long Tennis
Q. Firoz Shah Kotla Stadium is situated at?
a. Lucknow
b. Kolkatta
c. Delhi
d. Mumbai
Q. “SARS” word is related with?
a. Disease
b. Fish
c. A welfare organization for the Children’s
d. None of the above
Q. ‘Gate Way of India’ is situated at?
a. Delhi
b. Kolkatta
c. Mumbai
d. Madras
Q. The full form of ‘WHO’ is ?
a. World health organization
b. World House organization
c. World Hungry organization
d. None of the above
Q. Who built the famous Grand trunk Road?
a. Akbar
b. Babar
c. Sher Shah Suri
d. Aurangzeb
Q. Who wrote the epic ‘Ramayana?
a. Valmiki
b. Tulsi Das
c. Kabir
d. Guru Govind Singh
Q. Who has written ‘Lajja’?
a. Tusleema Nasreen
b. Salman Rushdie
c. Benazir Bhutto
d. None of the Above
Q. Gas freon is used in ?
a. Domestic Gas cylinders
b. Automobiles
c. Refrigerators
d. Gas Lighters
Q. Term ‘CNG Gas’ Stands for “
a. Compressed Nitrogen Gas
b. Compressed Nerve Gas
c. Compressed Natural Gas
d. None of the above
Q. The Chemical formula of water is?
a. HO2
b. H2O2
c. H2O
d. None of the Above
Q. The term ‘Jaundice’ is associated with?
a. Heart
b. Brain
c. Lever
d. Kidney
Q. The head quarter of North Central Railway (N.C.R.) is situated at ?
a. Delhi
b. Chandigarh
c. Allahabad
d. Kanpur
Q. Unit of energy is
a) Kilo volt hours
b) Kilo watt hours
c) Kilo watt
Q. As per Ohm’s law
a) V = IR
b) V = I/R
c) R = VxI
Q. Unit of resistance is
a) Ampere
b) Volts
c) Ohm
Q. In three phase 415 volts 50 Hz supply, the phase to phase voltage is
a) 220 Volts
b) 415 volts
c) 440 volts
Q. Watt-hour efficiency of a cell is always less than ampere-hour efficiency because
a) It takes into account the varying voltage of change and discharge
b) Charge volts are constant
c) Discharge volts are constant
d) Polarisation is neglected
Q. In three phase 415 volts 50 Hz supply, the phase to neutral voltage is
a) 220 volts
b) 230 volts
c) 440 volts
Q. HPSV stands for
a) High power sodium vapour
b) High pressure sodium vapour
c) High pressure sodium voltage
Q. The effect of load on synchronous motor is that its speed
a) increases
b) decreases
c) remains constant
Q. P.F. of induction motor proper than that of transformer because
a) Induction motor produces rotating magnetic torque
b) Induction motor produces mechanical torque
c) Induction motor has air gap
Q. Decrease in ambient temperature will
a) Decrease the rating of the motor
b) Increase in rating of motor
c) Not effect its rating
Q. The ideal value of power factor is
a) 0.9
b) 0.8
c) 1.0
Q. 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
Q. If the relay setting of 60/5 CT is at 3.75, then the tripping will be
a) 60 Amp.
b) 45 Amp.
c) 30 Amp.
Q. The instrument to measure the light is called
a) Tong tester
b) Lux meter
c) Micro meter
Q. The colour of healthy silica gel will be
a) White
b) Blue
c) Brown
Q. The specific gravity of fully charged lead battery is
a) 1200
b) 11600
c) 1180
Q. The acid used in lead acid battery is
a) Salt acid
b) Sulphuric acid
c) Sodium chloride
Q. The B.D.V. of new transformer oil is
a) 30 KV
b) 33 KV
c) 40 KV
Q. 10 hours use of 500 watt lamp will consume the energy
a) 10 units
b) 20 units
c) 5 units
Q. Earth relay of HT panels should be set at
a) At maximum
b) At minimum
c) At average
Q. The ideal starter for 0.5 HP electric motor is
a) D.O.L.
b) Star delta
c) Oil merged
Q. The work of step down transformer is to
a) Change the voltage
b) Reduce the voltage
c) Give constant voltage
Q. No. of poles in MCB/TPN is
a) 2 poles
b) 4 poles
c) 3 poles
Q. The material used for fuse wire is
a) Lead + Aluminium
b) Lead + Tin
c) Aluminium + Copper
d) Silver + Copper
Q. The working of a dynamo is based on the principal of
a) Heating effect of current
b) Magnetic effect of current
c) Chemical effect of current
d) Electromagnetic induction
Q. At resonance, in a series LCR circuit which relation does not hold
a) W = 1/LC
b) W = 1/LC 1/2
c) LW = 1/CW
d) CW = 1/LW
Q. The power factor of a series LCR, when at resonance, is
a) Zero
b) 0.5
c) 1.0
d) Depends on value of LCR
Q. An inductor may store energy in
a) Its electric field
b) Its coils
c) Its magnetic field
d) Both in electric and magnetic field
Q. In a short circuit containing inductance of zero resistance, the current lags behind the applied A.C. voltage by a phase angle of
a) 90 degree
b) 45 degree
c) 30 degree
d) Zero degree
Q. The self-inductance of a straight conductor is
a) Zero
b) Infinity
c) Very large
d) Very small
Q. The cover of a transformer is laminated to
a) Reduce eddy current losses
b) Increase magnetic flux
c) Increase strength of magnetic field
d) Increase residual magnetism
Q. A pair of a slip rings is used in
a) A.C. generators
b) D.C. generators
c) A.C. motors
d) D.C. motors
Q. A motors starter is
a) A fixed resistance
b) A variable resistance
c) A variable capacitor
d) A fixed inductor
Q. The ratio of primary and secondary turns in a transformer is 1:200. If 200 Volt AC is fed to primary, voltage across secondary will be
a) 44 V
b) 220 V
c) 220/220 V
d) 44 KV
Q. A choke is used as a resistance in
a) D.C. circuits
b) A.C. circuits
c) Both A.C. and D.C. circuits
d) Neither of the two
Q. A.C. is converted into D.C. by
a) Dynamo
b) Motor.
c) Transformer
d) Rectifier
Q. When a conductor is being charge, its potential energy
a) Large radius
b) Goes on decreasing
c) Conducting surface
d) Remain constant
Q. Farad is a unit of
a) Flux
b) Capacitance
c) Mutual inductance
d) Resistance of a conductor
Q. A uncharged conductor is placed near a charged conductor. This results in
a) Fall in potential of the charged conductor
b) Rise in potential of the charged conductor
c) Loss of some charge
d) All are true
Q. Insulator are said to behave like solids because
a) The electrons can’t move freely
b) Like solids they can withstand rough handling
c) Like solids they can bear pressure difference
d) Like solids they do not allow free movement
Q. Current in a conductor is due to
a) Motion of free electrons in it
b) Motion of +ve ions
c) Motion of electro potential
d) None of these
Q. Ohm’s law deals with the relation between
a) Current and potential
b) Capacity and charge
c) Capacity and potential
d) All are true
Q. A kilowatt-hour is a unit of
a) Energy
b) Electrical potential
c) Power
d) Electric current
Q. 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.
Q. B.O.T.U. is a unit of
a) Electric energy
b) Electric power
c) Electric capacity
d) It is fundamental unit
Q. Two bulbs, 100 Watt and 200 Watt are placed in a series and 440 volts applied across them
a) Both the lamp will fuse
b) Neither of the lamp will fuse
c) Only 100 watt lamp will fuse
d) Only 200 watt lamp will fuse
Q. If R1 and R2 are respectively the filament resistance of 200 watt and 100 watt bulbs designed to operate on the same voltage
a) R1 is tow times R2
b) R2 is tow times R1
c) R1 is four times R2
d) R2 is four times R1
Q. Two electric bulbs, one of 200 volts, 40 watt and the other of 200 Volts, 100 watt are connected in house wiring in series to a 220 volt line. The potential drop will be
a) Across two bulbs is the same
b) Across the 40 watt bulb is greater than the potential drop across the 100 watt bulb
c) Across the 100 watt bulb is greater than the potential drop across the 40 watt bulb
d) Across both the bulb is 220 volt
Q. D.C. motor can have efficiency
a) Equal to 1
b) Electric generator
c) Electric dynamo
d) All are wrong
Q. Work output of a D.C. motor is maximum when
a) Back e.m.f. = forward e.m.f./2
b) Back e.m.f. = forward e.m.f.x2
c) Forward e.m.f. = back e.m.f./2
d) Back e.m.f. = 2 x forward e.m.f.
Q. When wire carries current, a magnetic field is produced around it in the condition that the wire is made of
a) Copper
b) Tungsten
c) Iron
d) Any metal
Q. If a two phase supply is fed to operate three phase motor, following will happen
a) Motor will not work
b) Motor will work for a shorter period
c) Motor will get over heated
d) None of the above
Q. Safety belt is used by wireman while working at
a) In sub station
b) Repairing of LT cable
c) Repairing HT cable
d) While working on O/H line
Q. 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
Q. The following is competent to over head the HT OCB
a) Khalasi
b) Wireman grade-III
c) Wireman grade-II
d) Wireman grade-I
Q. Alternators are rated in
a) KVA
b) KW
c) KVAR
Q. Frequency of alternator can be increased by increasing
a) Speed
B) Excitation
C) Voltage
Q. HS Pump works with suction head.
a) 15-20 feet head
b) 21-40 feet head
c) 41-80 feet head
d) None of the above.
Q. VS Pump works with total head
a) Upto 46 Mtrs. head.
b) 46-70 Mtrs. head
c) 70-100 Mtrs. Head
d) None of the above
Q. Motor of the VS pump is located
a) Above the ground level
b) Below the ground level
c) Deep in the bore
d) None of the above
Q. Line shaft of the VS pump is lubricated
a) Spindle oil
b) Diesel oil
c) Lub oil SAE-40/30
d) None of the above
Q. Priming is required for
a) HS Pump
b) VS Pump
c) Submersible Pump
Q. RRM of submersible pump set is
a) 440
b) 1440
c) 380
d) 2800
Q. Which pump is most suitable for deep & titled bore
a) HS Pump
b) VS Pump
c) Submersible
d) Jet pump
e) None of above.
Q. Redevelopment of bore is done
a) For smooth operation of pump
b) For taking good yield for bore
c) To maintain long life of bore
d) To avoid the frequent failure of the pump
e) All of above.
Q. Cap. of pump set is selected on the ground of
a) Yield, Static-water-level, Working-water-level.
b) Location of bore
c) Type of starter provided
d) Quantity of water to be used.
Q. Pump fails mostly due to
a) Less working
b) Excessive working
c) Incorrect operation
d) Failure of pump
Q. Pump set motor burns due to
a) Single phasing
b) Reverse phasing
c) Over loading for a shorter period
d) None of above.
Q. For a 10 HP pump set which type of starter is suitable
a) DOL
b) Start Delta
c) Auto Transformer
d) None of the above
Q. A 5 HP pump set draws current on full load
a) 5 A
b) 10 A
c) 7.5 A
d) 6 A
Q. Ammeter is provided in control panel of pump set to measure the
a) Voltage
b) Frequency
c) Power Factor
d) Current
Q. No. of contractors provided in star-delta starter
a) 1
b) 2
c) 3
d) 4
Q. Pump Guard functions to protect the submersible pump set against
a) Single Phasing
b) Reverse Phasing
c) Over Loading
d) Dry Running
e) All of above.
Q. Automation of pump set is done to
a) To limit the working of pumps
b) To avoid the working of water
c) To save the electrical energy
d) To reduce the man power
e) All of the above.
Q. Centralized control of pumps means
a) Operation of pump from individual pump houses
b) Operation of all pumps from a single location
c) None of the above
Q. DG set operates at following RPM
a) 400
b) 300
c) 2000
d) 1500
Q. The following fuel is used in 70 KVA DG set
a) K. Oil
b) Petrol
c) High speed DSL oil
d) LPG
Q. Water is used in DG set for
a) Lubrication of piston
b) for lubrication of shaft
c) for cooling of DSL engine
d) For cooling of alternator
Q. High water temp. of DG set is maintained upto
a) 400c
b) 600c
c) 700c
d) 900c
Q. Lub. oil pressure of DG set is maintained upto
a) 1.5 Kg./CM
b) 3.0 Kg./CM
c) 4.0 Kg./CM
c) 7.0 Kg./CM
d) None of the above
Q. Before starting the DG set, what will be checked?
a) Water level in radiator
b) Level of Lub oil in the sump
c) Fuel in the fuel tank
d) Fan belt
e) Water pump belt
f) All of above.
Q. Cleaning of fuel tank is done
a) Once in a year
b) Once in half on year
c) Once in two years
d) Once in three years
Q. Schedule of DG set is carried out after
a) 200 hrs. of working
b) 250 hrs. of working
c) 300hrs. of working
d) 500 hrs. of working
Q. Fuel filter is replaced after
a) 6 months
b) 9 months
c) 12 months
d) 18 months
Q. Schedule of DG set is carried out after
a) Six months
b) 9 months
c) 12 months
d) 24 months
Q. Mono block submersible pump set is installed in
a) Deep tube well bore
b) Shallow tube well bore
c) Under ground tank
d) Sewage line
Q. DG set is operated during
a) Earth quake
b) Flood
c) Power Supply Failure
Q. One ton of refrigeration is equal to
a) 2000 Pond/hour
b) 180 BTU/hour
c) 12000 BTU/hour
Q. The presence of moisture in refrigeration system
a) Increases the head pressure
b) Deposit of ice on expansion valve
c) Increase of suction pressure
Q. The best way of leakage detection in AC system is
a) Soap method
b) Halide torch method
c) Electronic detector method
Q. In 1.5 Ton AC unit running capacitor required will be of
a) 36 mfd
b) 45 mfd
c) 10 mfd
d) 20 mfd
Q. In 2 Ton AC units has
a) 12000 BTU
b) 24000 BTU
c) 18000 BTU
Q. Starting relay used in AC units is
a) Voltage relay
b) Current relay
c) Starting relay
Q. The grill temperature of AC units is
a) 15 o C
b) 12 o C
c) 20 o C
d) 25 o C
Q. Boiling point of R-12 gas is
a) 22.7 o C
b) 21.7 o C
c) 32 o C
Q. Running capacitor required for water cooler
a) 15 mfd
b) 25 mfd
c) 36 mfd
d) 30 mfd
No comments:
Post a Comment