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Question & Answer TRD (DROPPERS & OTHER OHE CONDUCTORS)

7.1 The fittings, which is used to transfer the weight of contact wire to the catenary wire is called
(a) Section insulator 
(b) Jumpers
(c) Cantilever assembly 
(d) Droppers
Answer - (d) Droppers

7.2 Droppers are used for
(a) Leveling the contact wire
(b) To maintain stagger
(c) Reduced the sag in catenary wire 
(d) None of the above
Answer - (a) Leveling the contact wire

7.3 Droppers are made out of
(a) Annealed copper 
(b) Hard drawn copper
(c) Cadmium copper 
(d) Bronze
Answer - (b) Hard drawn copper

7.4 Diameter of in-span dropper in AC traction is
(a) 7 mm 
(b) 6.75 mm
(c) 6 mm
 (d) 5 mm
Answer -  (d) 5 mm

7.5 Diameter of inclined dropper in bracket assembly is
(a) 7 mm 
(b)5 mm
(c) 9 mm 
(d) 6 mm
Answer - (a) 7 mm 

7.6 In AC traction , how many droppers in 72 m span length
(a) 9 Droppers 
(b) 10 Droppers
(c) 8 Droppers 
(d) 12 Droppers
Answer - (a) 9 Droppers 

7.7 In AC traction , how many droppers in 58.5 m span length
(a) 9 droppers 
(b) 8 droppers
(c) 7 droppers 
(d) 6droppers
Answer - (c) 7 droppers 

7.8 In AC traction, how many droppers in 54 m span length
(a) 8 Droppers 
(b) 7 Droppers
(c) 6 Droppers 
(d) 5 Droppers
Answer - (b) 7 Droppers

7.9 In AC traction ,how many droppers in 35 m. non standard span length
(a) 5 Droppers 
(b) 4 Droppers
(c) 6 Droppers 
(d) 3 Droppers
Answer - (a) 5 Droppers 

7.10 In AC traction, spacing of „A‟ dropper (1st dropper from the support) is
(a) 4.50 m 
(b) 2.50 m
(c) 2.25 m 
(d) 2.00 m
Answer - (c) 2.25 m 

7.11 In AC traction, spacing of „A‟ dropper tolerance (1st dropper from the support) is ( As perRDSO latter no. TI/OHE/GA/3013 dated 14.05.13)
(a) ± 20 mm 
(b) Zero
(c) ± 10 mm 
(d) ± 30 mm
Answer - (d) ± 30 mm

7.12 In AC traction, length of „A‟ dropper tolerance (1st dropper from the support) is ( As perRDSO latter no. TI/OHE/GA/3013 dated 14.05.13)
(a) ± 5 mm
 (b) Zero
(c) ± 10 mm 
(d) ± 15 mm
Answer - (a) ± 5 mm

7.13 In AC traction, length of other droppers tolerance is ( As per RDSO latter no.TI/OHE/GA/3013 dated 14.05.13)
(a) ± 5 mm 
(b) Zero
(c) ± 10 mm 
(d) ± 15 mm
Answer -(a) ± 5 mm 
 
7.14 In AC traction, spacing of other dropper tolerance is ( As per RDSO latter no.TI/OHE/GA/3013 dated 14.05.13)
(a) ± 20 mm
 (b) Zero
(c) ± 50 mm
(d) ± 30 mm
Answer - (c) ± 50 mm

7.15 In AC traction, distance of 2nd dropper from 1st dropper in 72 m span length
(a) 9.0 m 
(b) 6.75 m
(c) 4.5 m 
(d) 2.25 m
Answer - (b) 6.75 m

7.16 In AC traction , distance of 2nd dropper from 1st dropper in 58.5 m. span length
(a) 9.0 m 
(b) 6.75 m
(c) 4.5 m 
(d) 2.25 m
Answer - (a) 9.0 m 

7.17 In AC traction , distance of 3rd dropper from 2nd dropper in 58.5 m span length
(a) 9 m 
(b) 6.75 m
(c) 6 m
 (d) 4.5 m
Answer - (a) 9 m 

7.18 In AC traction, a chain dropper is consists of parts viz (i) Fixed part (ii) Variable part. Whatwill be the length of 
(b) 125 mm
(c) 105 mm 
(d) 76.2 mm
Answer - (c) 105 mm 

7.19 If dropper is rigid type or encumbrance is less than 150 mm, the OHE is suitable upto themaximum speed
(a) 120 KMPH 
(b) 100 KMPH
(c) 90 KMPH 
(d) 65 KMPH
Answer - (c) 90 KMPH 

7.20 In AC traction , distance of 2nd dropper from 1st dropper in 60 m non standard span length
(a) 9.0 m 
(b) 6.75 m
(c) 6.0 m 
(d) 5.25 m
Answer - (d) 5.25 m

7.21 When equal encumbrance 1.4 m is given at both OHE supports & 100 mm pre sag in contactwire, what will be the length of 1st dropper in 72 m span length ?
(a) 1250 mm
(b) 1283 mm
(c) 1273 mm
 (d) 1261 mm
Answer - (c) 1273 mm

7.22 When equal encumbrance 1.4 m. is given at both OHE supports & 100 mm pre sag in contactwire, what will be the length of 2nd dropper in 72 m span length?
(a) 1118 mm 
(b) 1018 mm
(c) 908 mm 
(d) 902 mm
Answer - (b) 1018 mm

7.23 When equal encumbrance 1.4 m. is given at both OHE supports & 100 mm pre sag in contactwire, what will be the length of 3rd dropper in 72 m span length ?
(a) 767 mm
 (b) 763 mm
(c) 761 mm 
(d) 758 mm
Answer - (a) 767 mm

7.24 When equal encumbrance 1.4 m. is given at both OHE supports & 100 mm pre sag in contactwire, what will be the length of 4th dropper in 72 m span length?
(a) 621 mm 
(b) 617 mm
(c) 613 mm 
(d) 609 mm
Answer - (b) 617 mm

7.25 When equal encumbrance 1.4 m. is given both OHE supports &100 mm pre sag in contactwire, what will be the length of 5th dropper in 72 m span length?
(a) 589 mm 
(b) 576 mm
(c) 571 mm 
(d) 566 mm
Answer - (d) 566 mm

7.26 Chain droppers are used for smooth adjustment of section insulator, both the pieces of chaindroppers are connected together by P.G. clamp, what is the length of piece of dropper ?
(a) 400 mm 
(b) 450 mm
(c) 350 mm 
(d) 320 mm
Answer - (c) 350 mm 

7.27 In AC traction, distance between 1st & 2nd dropper in 56 m non standardspan length is
(a) 4.50 m 
(b) 6.75 m
(c) 7.75 m 
(d) 9.00 m
Answer - (c) 7.75 m 

7.28 For inclined OHE, angle between dropper‟s top position & vertical planeshould not be more than
(a) 100 
(b) 60
(c) 40 
(d) 20
Answer - (c) 40 

7.29 Material of AC catenary wire is
(a) Cadmium copper 
(b) Annealed copper
(c) Hard drawn copper 
(d) Bronze
Answer - (a) Cadmium copper 

7.30 No. of layers& strands of AC catenary wire is
(a) 3 layer & 19 strands 
(b) 2 layer & 19 strands
(c) 2 layer & 37 strands
(d) 3 layer & 37 strands
Answer -(b) 2 layer & 19 strands

7.31 Diameter of each strand of AC catenary wire is
(a) 2.92 mm 
(b) 2.42 mm
(c) 2.11 mm 
(d) 2.32 mm
Answer - (c) 2.11 mm 

7.32 Over all diameterof ac catenary wire is
(a) 12.56 mm 
(b) 12.25 mm
(c) 10.50 mm 
(d) 9.20 mm
Answer - (c) 10.50 mm 

7.33 Cross section area of AC catenary wire is
(a) 107 sq mm
(b) 98 sq mm
(c) 65 sq mm 
(d) 61 sq mm
Answer - (c) 65 sq mm 

7.34 Per meter weight of catenary wire is
(a) 1250 gm 
(b) 971 gm
(c) 951 gm 
(d) 603 gm
Answer - (d) 603 gm

7.35 Material of 107sq mm wire is
(a) Hard drawn copper 
(b) Annealed copper
(c) Cadmium copper 
(d) Brass
Answer - (a) Hard drawn copper 

7.36 Diameter of new 107sq mm wire is
(a) 16.36 mm 
(b) 12.24 mm
(c) 10.55 mm 
(d) 8.25 mm
Answer - (b) 12.24 mm

7.37 Condemning size of 107sq mm wire
(a) 8.93 mm 
(b) 8.34 mm
(c) 8.25 mm 
(d) 8.89 mm
Answer - (c) 8.25 mm 

7.38 Cross section area of 107sq mm wire is
(a) 193 sq mm 
(b) 158 sq mm
(c) 107 sq mm 
(d) 97 sq mm
Answer - (c) 107 sq mm 

7.39 Per meter weight of 107sq mm wire is
(a) 951 gm 
(b) 930 gm
(c) 870 gm 
(d) 603 gm
Answer - (a) 951 gm 

7.40 Current density of copper (continuous) is
(a) 4 amps/sq. mm 
(b) 7 amps /sq. mm
(c) 5 amps /sq. mm 
(d) 2 amps /sq. mm
Answer - (a) 4 amps/sq. mm 

7.41 Current density of copper ( for 3 minutes ) is
(a) 9 amps /sq. mm
 (b) 7 amps /sq. mm
(c) 6 amps /sq. mm 
(d) 5 amps /sq. mm
Answer -  (b) 7 amps /sq. mm

7.42 Conductivity of aluminum in terms of equivalent copper will be
(a) 70 % 
(b) 60 %
(c) 45 % 
(d) 30 %18
Answer - (b) 60 %

7.43 Conductivity of cadmium copper in terms of equivalent copper will be
(a) 80 % 
(b) 70 %
(c) 45 %
(d) 30 %
Answer - (a) 80 % 

7.44 Tensile strength of annealed copper is
(a) 25 kg/ sq mm 
(b) 42 kg / sq mm
(c) 63 kg/ sq mm 
(d) 66 kg / sq mm
Answer -(a) 25 kg/ sq mm 

7.45 Tensile strength of hard drawn copper is
(a) 25 kg /sq mm 
(b) 42 kg /sq mm
(c) 63 kg /sq mm 
(d) 66 kg /sq mm
Answer - (b) 42 kg /sq mm

7.46 Tensile strength of cadmium copper is
(a) 50 kg /sq mm 
(b) 59 kg /sq mm
(c) 69 kg /sq mm 
(d) 63 kg /sq mm
Answer - (d) 63 kg /sq mm

7.47Tensile strength of aluminum, in terms of equivalent copper will be
(a) 75 % 
(b) 66 %
(c) 50 % 
(d) 45 %
Answer -(d) 45 %

7.48 Weight of aluminum, in terms of equivalent copper will be
(a) 60 % 
(b) 45 %
(c) 33 % 
(d) 30 %
Answer - (c) 33 % 

7.49 Cadmium copper is used in place of hard drawn copper for AC catenary wire, why?
(a) To increase tensile strength of catenary
(b) To reduce the weight of catenary
(c) To increases current carrying capacity
(d) None of above
Answer -(a) To increase tensile strength of catenary

7.50 Groove angle of 107sq mm contact wire i
(a) 78 degree 
(b) 81 degree
(c) 91degree 
(d) 71 degree
Answer -s(a) 78 degree 

7.51 Distance between groove edge to groove edge i.e. inner distance in 107sq mm wire
(a) 6.92 mm 
(b) 3.42 mm
(c) 5.62 mm 
(d) 8.12 mm
Answer -(a) 6.92 mm 

7.52 Vertical distance between the centre of the groove to the top of crown in 107sq mm wire willbe
(a) 5.30 mm 
(b) 5.6 mm
(c) 4.45 mm 
(d) 4.0 mm
Answer -(c) 4.45 mm 

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