Wireman – Semester 4, Module 1 & 2 - Generation and transmission

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Common for Wireman Trade 2nd Year Part-3

NAME *

NAME OF THE ITI *

MOBILE NUMBER *

61 : What is the name of conductor used in overhead lines? *

2 points

A : ACSR

B : Iron

C : Brass

D : Copper

62 : Which is the important property of OH line supports? *

2 points

A : High mechanical strength

B : Withstand Heavy weight

C : High conductivity

D : Low specific gravity

63 : Which is the span length of steel tower? *

2 points

A : 40-50 meter

B : 50-80 meter

C : 60-100 meter

D : 100-300 meter

64 : Which height the stay insulators are to be fixed? *

2 points

A : Not below 1 m from ground

B : Not below 1.5 m from ground

C : Not below 2 m from ground

D : Not below 3 meters from ground

65 : Which is the name of insulator? *

3 points

A : Suspension insulator

B : Stay insulator

C : Shackle insulator

D : Post insulator

66 : Which is the name of insulator? *

3 points

A : Pin insulator

B : Stay insulator

C : Shackle insulator

D : Disc insulator

67 : Which is the clearance between live conductors in OH.LT. vertical configuration? *

2 points

A : 20 cm

B : 30 cm

C : 40 cm

D : 50 cm

68 : What is the purpose of applying grease in binded aluminium joints in OH lines? *

2 points

A : Avoid sparking

B : Avoid oxidation

C : Avoid loose connection

D : Fill the gap between turns

69 : What is minimum clearance between earth and live conductor in LT vertical configuration? *

3 points

A : 10 cm

B : 15 cm

C : 25 cm

D : 30 cm

70 : Which is the conductivity of aluminium compared to copper? *

2 points

A : 30%

B : 40%

C : 50%

D : 60%

71 : Which is the height of bus-bar assembly to be installed from ground? *

2 points

A : 1 m

B : 1.5 m

C : 2 m

D : 2.75 m

72 : What is the name of material used for bus bar? *

2 points

A : Brass

B : High speed steel

C : Bronze

D : Aluminium

73 : Which is non conventional power generation? *

2 points

A : Wind

B : Nuclear

C : Thermal

D : Hydro

74 : Which is the suitable place for construction of hydro power plant? *

2 points

A : Hill area

B : Seashore

C : Islands

D : Deserts

75 : Which is the main disadvantage of hydro power plant? *

2 points

A : High capital cost

B : Complicated construction

C : High maintenance cost

D : Requires long starting time

76 : Which is the advantage of diesel power plant over thermal plant? *

2 points

A : More efficient

B : Less noise

C : Low maintenance cost

D : High unit capacity

77 : Which device heats the feed water on its way to boiler by deriving heat from the flue gases in thermal power plant? *

3 points

A : Super heater

B : Economiser

C : Air preheater

D : Condenser

78 : Which part convert potential energy into kinetic energy in tidal power plant? *

2 points

A : Sluices

B : Embankments

C : Turbines

D : Barrage

79 : Which is the disadvantage of AC electric power transmission? *

2 points

A : Skin effect

B : More voltage fluctuation

C : Required transformer for voltage step up/down

D : More line loss

80 : Which is the advantage of DC electric power transmission? *

2 points

A : Required only two conductors

B : No communication problem due to high voltae

C : No need of transformer

D : High voltage transmission

81 : Which is the voltage range transmitted to load center in primary transmission? *

2 points

A : 11KV

B : 33KV

C : 66KV

D : 132KV

82 : Which is the voltage range transmitted in secondary transmission system? *

2 points

A : 11 KV

B : 11.5 KV

C : 12 KV

D : 66 KV

83 : Which is the property of conducting materials used for OH lines? *

2 points

A : High tensile strength

B : High specific gravity

C : High dielectric strength

D : Easy available in the market

84 : How many disc of suspension insulators are to be connected in series for a 66 KV working voltage? *

3 points

A : 2

B : 3

C : 4

D : 6

85 : Which insulator is used for terminating corner poles? *

2 points

A : Pin insulator

B : Shackle insulators

C : Stay insulator

D : Cap and pin type insulator

86 : Which is the size of binding wires used to bind insulator in OH lines? *

2 points

A : Not less than 1sq.mm

B : Not less than 1.5sq.mm

C : Not less than 2sq .mm

D : Not less than 2.5sq.mm

87 : Which is the minimum clearance between live wires on either side of a support in OH horizontal configuration of conductors? *

3 points

A : 10 cm

B : 25 cm

C : 30 cm

D : 45 cm

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