Question 1

Shunt capacitance is neglected while considering

Accepted Answer

A) short transmission line 
B) medium transmission line 
C) long transmission line 
D) medium and long transmission lines 
A) short transmission line 
B) medium transmission line 
C) long transmission line 
D) medium and long transmission lines A

Question 2

For the protection of power station buildings against direct strokes the requirements are

Accepted Answer

A) interception 
B) interception and conduction 
C) interception, conduction and dissipation 
D) interception, conduction, dissipation and reflection 
A) interception 
B) interception and conduction 
C) interception, conduction and dissipation 
D) interception, conduction, dissipation and reflection C

Question 3

To protect most of the electrical equipment handling low power, the types of relays used are

Accepted Answer

A) thermocouple 
B) electronic and bimetallic 
C) both (
A)  and (
B)  
D) none of the above 
A) thermocouple 
B) electronic and bimetallic 
C) both (
A)  and (
B)  
D) none of the above C

Question 4

Wave trap is used to trap waves of

Accepted Answer

A) power frequencies 
B) higher frequencies entering generator or transformer units 
C) either of the above 
D) none of the above 
A) power frequencies 
B) higher frequencies entering generator or transformer units 
C) either of the above 
D) none of the above

Question 5

The delay fuses are used for the protection of ________.

Accepted Answer

A) motors 
B) power outlet circuits 
C) fluorescent lamps 
D) light circuits 
A) motors 
B) power outlet circuits 
C) fluorescent lamps 
D) light circuits

Question 6

The reflection co-efficient at the open circuited end of a transmission line.

Accepted Answer

A) zero 
B) infinity 
C) unity 
D) none of the above 
A) zero 
B) infinity 
C) unity 
D) none of the above

Question 7

Ungrounded neutral transmission system is not recommended because of system

Accepted Answer

A) insulation being overstressed due to over voltages 
B) insulation overstress may lead to failure and subsequent phase to phase faults 
C) being inadequately protected against ground fault 
D) all of the above 
A) insulation being overstressed due to over voltages 
B) insulation overstress may lead to failure and subsequent phase to phase faults 
C) being inadequately protected against ground fault 
D) all of the above

Question 8

When a transmission line is energized, the wave that propagates on it is

Accepted Answer

A) current wave only 
B) voltage wave only 
C) both (
A)  and (
B)  
D) power factor wave only 
A) current wave only 
B) voltage wave only 
C) both (
A)  and (
B)  
D) power factor wave only

Question 9

Protective relays are devices that detect abnormal conditions in electrical circuits by measuring

Accepted Answer

A) current during abnormal condition 
B) voltage during abnormal condition 
C) constantly the electrical quantities which differ during normal and abnormal conditions 
D) none of the above 
A) current during abnormal condition 
B) voltage during abnormal condition 
C) constantly the electrical quantities which differ during normal and abnormal conditions 
D) none of the above

Question 10

Overheating of relay contacts or contact born out is due to

Accepted Answer

A) slow making and breaking of load circuit contacts 
B) foreign matter on the contact surface 
C) too low contact pressure 
D) all of the above 
A) slow making and breaking of load circuit contacts 
B) foreign matter on the contact surface 
C) too low contact pressure 
D) all of the above

Question 11

The arc voltage produced in A.C. circuit breaker is always

Accepted Answer

A) in phase with the arc current 
B) lagging the arc current by 90? 
C) leading the arc current by 90° 
D) none of the above 
A) in phase with the arc current 
B) lagging the arc current by 90? 
C) leading the arc current by 90° 
D) none of the above

Question 12

The interaction between a transmission line and communication line is minimized by

Accepted Answer

A) transposing transmission as well as communication lines 
B) increasing the height of the trans-mission line tower 
C) increasing the distance between the two lines 
D) all of the above 
A) transposing transmission as well as communication lines 
B) increasing the height of the trans-mission line tower 
C) increasing the distance between the two lines 
D) all of the above

Question 13

When a wave propagates on a transmission line, it suffers reflection several times at

Accepted Answer

A) tapping 
B) load end 
C) sending end 
D) sending and other end 
A) tapping 
B) load end 
C) sending end 
D) sending and other end

Question 14

Insulation resistance of high voltage circuit breakers is more than

Accepted Answer

A) 1 mega ohms 
B) 10 mega ohms 
C) 100 mega ohms 
D) 500 mega ohms 
A) 1 mega ohms 
B) 10 mega ohms 
C) 100 mega ohms 
D) 500 mega ohms

Question 15

In a circuit breaker the basic problem is to

Accepted Answer

A) maintain the arc 
B) extinguish the arc 
C) transmit large power 
D) emit the ionizing electrons 
A) maintain the arc 
B) extinguish the arc 
C) transmit large power 
D) emit the ionizing electrons

Question 16

Ionization in circuit breaker is facilitated by

Accepted Answer

A) high temperature 
B) increase of mean free path 
C) increasing field strength 
D) all of the above 
A) high temperature 
B) increase of mean free path 
C) increasing field strength 
D) all of the above

Question 17

The voltage appearing across the contacts after opening of the circuit breaker is called______voltage.

Accepted Answer

A) recovery 
B) surge 
C) operating 
D) arc 
A) recovery 
B) surge 
C) operating 
D) arc

Question 18

Resistance grounding is used for voltage between

Accepted Answer

A) 33kVto66kV 
B) HkVto33kV 
C) 3.3kVandllkV 
D) none of the above 
A) 33kVto66kV 
B) HkVto33kV 
C) 3.3kVandllkV 
D) none of the above

Question 19

Interruption of large currents by relay requires

Accepted Answer

A) arc suppressing blow out coils 
B) wide separation of the opened contacts 
C) high speed opening of contacts 
D) all of the above 
A) arc suppressing blow out coils 
B) wide separation of the opened contacts 
C) high speed opening of contacts 
D) all of the above

Question 20

Which of the following is the least expensive protection for overcurrent is low voltage system ?

Accepted Answer

A) Rewireable fuse 
B) Isolator 
C) Oil circuit breaker 
D) Air break circuit breaker 
A) Rewireable fuse 
B) Isolator 
C) Oil circuit breaker 
D) Air break circuit breaker

Shunt capacitance is neglected while considering

For the protection of power station buildings against direct strokes the requirements are

To protect most of the electrical equipment handling low power, the types of relays used are

Wave trap is used to trap waves of

The delay fuses are used for the protection of ________.

The reflection co-efficient at the open circuited end of a transmission line.

Ungrounded neutral transmission system is not recommended because of system

When a transmission line is energized, the wave that propagates on it is

Protective relays are devices that detect abnormal conditions in electrical circuits by measuring

Overheating of relay contacts or contact born out is due to

The arc voltage produced in A.C. circuit breaker is always

The interaction between a transmission line and communication line is minimized by

When a wave propagates on a transmission line, it suffers reflection several times at

Insulation resistance of high voltage circuit breakers is more than

In a circuit breaker the basic problem is to

Ionization in circuit breaker is facilitated by

The voltage appearing across the contacts after opening of the circuit breaker is called______voltage.

Resistance grounding is used for voltage between

Interruption of large currents by relay requires

Which of the following is the least expensive protection for overcurrent is low voltage system ?

Electrical Protection and Circuit Breakers

Power System Protection and Equipment

Electrical Protection and Safety: Part A

Electrical Protection and Safety: Part B

Protective Relays and Circuit Breakers for Electrical Systems

Circuit Breakers and Fuses

Electric Arc and Circuit Breaker Protection

Electrical Components and Circuit Breakers

Electrical Protection and Switchgear

Relaying Schemes and Techniques for Electrical Equipment Protection

Understanding Relays for Power System Protection

Filters

Exam 2: Electrical Protection and Transmission Line Characteristics

Shunt capacitance is neglected while considering

For the protection of power station buildings against direct strokes the requirements are

To protect most of the electrical equipment handling low power, the types of relays used are

Wave trap is used to trap waves of

The delay fuses are used for the protection of ________.

The reflection co-efficient at the open circuited end of a transmission line.

Ungrounded neutral transmission system is not recommended because of system

When a transmission line is energized, the wave that propagates on it is

Protective relays are devices that detect abnormal conditions in electrical circuits by measuring

Overheating of relay contacts or contact born out is due to

The arc voltage produced in A.C. circuit breaker is always

The interaction between a transmission line and communication line is minimized by

When a wave propagates on a transmission line, it suffers reflection several times at

Insulation resistance of high voltage circuit breakers is more than

In a circuit breaker the basic problem is to

Ionization in circuit breaker is facilitated by

The voltage appearing across the contacts after opening of the circuit breaker is called______voltage.

Resistance grounding is used for voltage between

Interruption of large currents by relay requires

Which of the following is the least expensive protection for overcurrent is low voltage system ?

Electrical Protection and Circuit Breakers

Power System Protection and Equipment

Electrical Protection and Safety: Part A

Electrical Protection and Safety: Part B

Protective Relays and Circuit Breakers for Electrical Systems

Circuit Breakers and Fuses

Electric Arc and Circuit Breaker Protection

Electrical Components and Circuit Breakers

Electrical Protection and Switchgear

Relaying Schemes and Techniques for Electrical Equipment Protection

Understanding Relays for Power System Protection

Filters