Transmission Line MCQs | Transmission Line Short Questions and Answers

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Questions
41 Transmission voltage of ll kV is normally used for distances upto
A 20—25 km
B 40—50 km
C 60—70 km
D All of the above

Answer: 20—25 km
42 Which of the following regulations is considered best?
A 50%
B 20%
C 10%
D 2%

Answer: 2%
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43 Which of the following bus-bar schemes has the lowest cost ?
A Ring bus-bar scheme
B Single bus-bar scheme
C Breaker and a half scheme
D Main and transfer scheme

Answer: Single bus-bar scheme
44 By which of the following methods string efficiency can be improved ?
A Using a guard ring
B Grading the insulator
C Using long cross arm
D Any of the above

Answer: Any of the above
45 By which of the following a bus-bar is rated ?
A Current only
B Current and voltage
C Current, voltage and frequency
D Current, voltage, frequency and short time current

Answer: Current, voltage, frequency and short time current
46 For which of the following equipment current rating is not necessary ?
A Circuit breakers
B Isolators
C Load break switch
D none of the above

Answer: Isolators
47 jCorona usually occurs when the electrostatic stress in air around the conductor exceeds
A 6.6 kV (r.m.s. value)/cm
B 11 kV (r.m.s. value)/cm
C 22 kV (maximum value)/cm
D 30 kV (maximum value)/cm

Answer: 30 kV (maximum value)/cm
48 The current drawn by the line due to corona losses is
A non-sinusoidal
B sinusoidal
C triangular
D square

Answer: non-sinusoidal
49 Pin type insulators are generally not used for voltages beyond
A 1 kV
B 11 kV
C 22 kV
D 33 kV

Answer: 33 kV
50 Aluminium has a specific gravity of
A 1.5
B 2.7
C 4.2
D 7.8

Answer: 2.7
51 For transmission of power over a distance of 200 km, the transmission voltage should be
A 132 kV
B 66 kV
C 33 kV
D 11 kV

Answer: 132 kV
52 Which of the following equipment, for regulating the voltage in distribution feeder, will be most economical ?
A Static condenser
B Synchronous condenser
C Tap changing transformer
D Booster transformer

Answer: Booster transformer
53 In a tap changing transformer, the tappings are provided on
A primary winding
B secondary winding
C high voltage winding
D any of the above

Answer: high voltage winding
54 On which of the following factors skin effect depends ?
A Frequency of the current
B Size of the conductor
C Resistivity of the conductor material
D All of the above

Answer: All of the above
55 For transmission of power over a distance of 500 km, the transmission voltage should be in the range
A 150 to 220 kV
B 100 to 120 kV
C 60 to 100 kV
D 20 to 50 kV

Answer: 150 to 220 kV
56 Electro-mechanical voltage regulators are generally used in
A Reactors
B Generators
C Transformers
D All Of The Above

Answer: Generators
57 When a conductor carries more current on the surface as compared to core, it is due to
A permeability variation
B corona
C skin effect
D unsymmetrical fault

Answer: skin effect
58 The following system is not generally used
A 1-phase 3 wire
B 1-phase 4 wire
C 3-phase 3 wire
D None of the above

Answer: 1-phase 3 wire
59 When a live conductor of public electric supply breaks down and touches the earth which of the following will happen ?
A Current will flow to earth
B Supply voltage will drop
C Supply voltage will increase
D None of the above

Answer: Current will flow to earth
60 The voltage regulation in magnetic amplifier type voltage regulator is effected by
A electromagnetic induction
B varying the resistance
C varying the reactance
D All of the above

Answer: varying the reactance

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