Question 1

The frequency of voltage generated, in case of generators, can be increased by

Accepted Answer

A) using reactors 
B) increasing the load 
C) adjusting the governor 
D) reducing the terminal voltage 
A) using reactors 
B) increasing the load 
C) adjusting the governor 
D) reducing the terminal voltage C

Question 2

For transmission of power over a distance of 200 km, the transmission voltage should be

Accepted Answer

A) 132 kV 
B) 66 kV 
C) 33 kV 
D) 11 kV 
A) 132 kV 
B) 66 kV 
C) 33 kV 
D) 11 kV A

Question 3

The use of strain type insulators is made where the conductors are

Accepted Answer

A) dead ended 
B) at intermediate anchor towers 
C) any of the above 
D) none of the above 
A) dead ended 
B) at intermediate anchor towers 
C) any of the above 
D) none of the above C

Question 4

Series capacitors on transmission lines are of little use when the load VAR requirement is

Accepted Answer

A) large 
B) small 
C) fluctuating 
D) any of the above 
A) large 
B) small 
C) fluctuating 
D) any of the above

Question 5

In the analysis of which of the following lines shunt capacitance is neglected ?

Accepted Answer

A) Short transmission lines 
B) Medium transmission lines 
C) Long transmission lines 
D) Medium as well as long transmission lines 
A) Short transmission lines 
B) Medium transmission lines 
C) Long transmission lines 
D) Medium as well as long transmission lines

Question 6

The voltage regulation in magnetic amplifier type voltage regulator is effected by

Accepted Answer

A) electromagnetic induction 
B) varying the resistance 
C) varying the reactance 
D) variable transformer 
A) electromagnetic induction 
B) varying the resistance 
C) varying the reactance 
D) variable transformer

Question 7

In a tap changing transformer, the tappings are provided on

Accepted Answer

A) primary winding 
B) secondary winding 
C) high voltage winding 
D) any of the above 
A) primary winding 
B) secondary winding 
C) high voltage winding 
D) any of the above

Question 8

Aluminium has a specific gravity of

Accepted Answer

A) 1.5 
B) 2.7 
C) 4.2 
D) 7.8 
A) 1.5 
B) 2.7 
C) 4.2 
D) 7.8

Question 9

Pin type insulators are generally not used for voltages beyond

Accepted Answer

A) 1 kV 
B) 11 kV 
C) 22 kV 
D) 33 kV 
A) 1 kV 
B) 11 kV 
C) 22 kV 
D) 33 kV

Question 10

When the interconnector between two stations has large reactance

Accepted Answer

A) the transfer of power will take place with voltage fluctuation and noise 
B) the transfer of power will take place with least loss 
C) the stations will fall out of step because of large angular displacement between the stations 
D) none of the above 
A) the transfer of power will take place with voltage fluctuation and noise 
B) the transfer of power will take place with least loss 
C) the stations will fall out of step because of large angular displacement between the stations 
D) none of the above

Question 11

Constant voltage transmission entails the following disadvantage

Accepted Answer

A) large conductor area is required for same power transmission 
B) short-circuit current of the system is increased 
C) either of the above 
D) none of the above 
A) large conductor area is required for same power transmission 
B) short-circuit current of the system is increased 
C) either of the above 
D) none of the above

Question 12

When an alternator connected to the bus-bar is shut down the bus-bar voltage will

Accepted Answer

A) fall 
B) rise 
C) remain unchanged 
D) none of the above 
A) fall 
B) rise 
C) remain unchanged 
D) none of the above

Question 13

For transmission of power over a distance of 500 km, the transmission voltage should be in the range

Accepted Answer

A) 150 to 220 kV 
B) 100 to 120 kV 
C) 60 to 100 kV 
D) 20 to 50 kV 
A) 150 to 220 kV 
B) 100 to 120 kV 
C) 60 to 100 kV 
D) 20 to 50 kV

Question 14

The current drawn by the line due to corona losses is

Accepted Answer

A) non-sinusoidal 
B) sinusoidal 
C) triangular 
D) square 
A) non-sinusoidal 
B) sinusoidal 
C) triangular 
D) square

Question 15

On which of the following factors skin effect depends ?

Accepted Answer

A) Frequency of the current 
B) Size of the conductor 
C) Resistivity of the conductor material 
D) All of the above 
A) Frequency of the current 
B) Size of the conductor 
C) Resistivity of the conductor material 
D) All of the above

Question 16

The skin effect of a conductor will reduce as the

Accepted Answer

A) resistivity of conductor material increases 
B) permeability of conductor material increases 
C) diameter increases 
D) frequency increases 
A) resistivity of conductor material increases 
B) permeability of conductor material increases 
C) diameter increases 
D) frequency increases

Question 17

For aluminium, as compared to copper, all the following factors have higher values except

Accepted Answer

A) specific volume 
B) electrical conductivity 
C) co-efficient of linear expansion 
D) resistance per unit length for same cross-section 
A) specific volume 
B) electrical conductivity 
C) co-efficient of linear expansion 
D) resistance per unit length for same cross-section

Question 18

The following system is not generally used

Accepted Answer

A) 1-phase 3 wire 
B) 1-phase 4 wire 
C) 3-phase 3 wire 
D) 3-phase 4 wire 
A) 1-phase 3 wire 
B) 1-phase 4 wire 
C) 3-phase 3 wire 
D) 3-phase 4 wire

Question 19

When a conductor carries more current on the surface as compared to core, it is due to

Accepted Answer

A) permeability variation 
B) corona 
C) skin effect 
D) unsymmetrical fault 
A) permeability variation 
B) corona 
C) skin effect 
D) unsymmetrical fault

Question 20

The angular displacement between two interconnected stations is mainly due to

Accepted Answer

A) armature reactance of both alternators 
B) reactance of the interconnector 
C) synchronous reactance of both the alternators 
D) all of the above 
A) armature reactance of both alternators 
B) reactance of the interconnector 
C) synchronous reactance of both the alternators 
D) all of the above

The frequency of voltage generated, in case of generators, can be increased by

For transmission of power over a distance of 200 km, the transmission voltage should be

The use of strain type insulators is made where the conductors are

Series capacitors on transmission lines are of little use when the load VAR requirement is

In the analysis of which of the following lines shunt capacitance is neglected ?

The voltage regulation in magnetic amplifier type voltage regulator is effected by

In a tap changing transformer, the tappings are provided on

Aluminium has a specific gravity of

Pin type insulators are generally not used for voltages beyond

When the interconnector between two stations has large reactance

Constant voltage transmission entails the following disadvantage

When an alternator connected to the bus-bar is shut down the bus-bar voltage will

For transmission of power over a distance of 500 km, the transmission voltage should be in the range

The current drawn by the line due to corona losses is

On which of the following factors skin effect depends ?

The skin effect of a conductor will reduce as the

For aluminium, as compared to copper, all the following factors have higher values except

The following system is not generally used

When a conductor carries more current on the surface as compared to core, it is due to

The angular displacement between two interconnected stations is mainly due to

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Exam 4: Electrical Transmission and Insulation

The frequency of voltage generated, in case of generators, can be increased by

For transmission of power over a distance of 200 km, the transmission voltage should be

The use of strain type insulators is made where the conductors are

Series capacitors on transmission lines are of little use when the load VAR requirement is

In the analysis of which of the following lines shunt capacitance is neglected ?

The voltage regulation in magnetic amplifier type voltage regulator is effected by

In a tap changing transformer, the tappings are provided on

Aluminium has a specific gravity of

Pin type insulators are generally not used for voltages beyond

When the interconnector between two stations has large reactance

Constant voltage transmission entails the following disadvantage

When an alternator connected to the bus-bar is shut down the bus-bar voltage will

For transmission of power over a distance of 500 km, the transmission voltage should be in the range

The current drawn by the line due to corona losses is

On which of the following factors skin effect depends ?

The skin effect of a conductor will reduce as the

For aluminium, as compared to copper, all the following factors have higher values except

The following system is not generally used

When a conductor carries more current on the surface as compared to core, it is due to

The angular displacement between two interconnected stations is mainly due to

Electrical Power Transmission and Distribution

Electrical Supply and Distribution

Transmission System and Equipment

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