Switchgear & Protection - Electrical Engineering (MCQ) questions and answers

1)   Which of the following circuit breakers has the lowest operating voltage?
- Published on 18 Nov 15

a. SF6 circuit breaker
b. Air break
c. Air blast
d. Minimum oil circuit breaker
Answer  Explanation  Related Ques

ANSWER: Air break

Explanation:
No explanation is available for this question!


2)   The most efficient torque producing actuating structure for the induction type relays is
- Published on 18 Nov 15

a. Shaded pole structure
b. Watt hour meter structure
c. Induction cup structure
d. Single induction loop structure
Answer  Explanation  Related Ques

ANSWER: Induction cup structure

Explanation:
No explanation is available for this question!


3)   Plug setting of a electromagnetic relay can be altered by varying
- Published on 18 Nov 15

a. Number of ampere turns
b. Air gap of magnetic path
c. Adjustable back stop
d. None of these
Answer  Explanation  Related Ques

ANSWER: Number of ampere turns

Explanation:
No explanation is available for this question!


4)   In the following figure, the tripping circuit is__________.
V Curves For Synchronous Generator

- Published on 18 Nov 15

a. AC
b. DC
c. Either AC or DC
d. None of these
Answer  Explanation  Related Ques

ANSWER: Either AC or DC

Explanation:
No explanation is available for this question!


5)   In the following figure, which component ensures the safety of the line from damage?
V Curves For Synchronous Generator

- Published on 18 Nov 15

a. Relay
b. Circuit breaker
c. Bus bar
d. Current transformer
Answer  Explanation  Related Ques

ANSWER: Relay

Explanation:
No explanation is available for this question!


6)   In the following figure, the relay circuit is divided into three parts. What does the third part consist of?
V Curves For Synchronous Generator

- Published on 18 Nov 15

a. Primary winding of a current CT which is connected in series with the line to be protected.
b. Secondary of the CT and the operating coil.
c. Tripping circuit.
d. None of these
Answer  Explanation  Related Ques

ANSWER: Tripping circuit.

Explanation:
No explanation is available for this question!


7)   In the following figure, the relay circuit is divided into three parts. What does the first part consist of?
V Curves For Synchronous Generator

- Published on 18 Nov 15

a. Primary winding of a current CT which is connected in series with the line to be protected.
b. Secondary of the CT and the operating coil.
c. Tripping circuit.
d. None of these
Answer  Explanation  Related Ques

ANSWER: Primary winding of a current CT which is connected in series with the line to be protected.

Explanation:
No explanation is available for this question!


8)   On what factor does the operating speed of the relay depend?
- Published on 18 Nov 15

a. Rate of flux built up
b. Armature core air gap
c. Spring tension
d. All of these
Answer  Explanation  Related Ques

ANSWER: All of these

Explanation:
No explanation is available for this question!


9)   Protective relays can be designed to respond to ___________.
- Published on 18 Nov 15

a. Light intensity, impedance
b. Temperature, resistance, reactance
c. Voltage and current
d. All of these
Answer  Explanation  Related Ques

ANSWER: All of these

Explanation:
No explanation is available for this question!


10)   What is the actuating quantity for the relays?
- Published on 18 Nov 15

a. Magnitude
b. Frequency
c. Phase angle
d. All of these
Answer  Explanation  Related Ques

ANSWER: All of these

Explanation:
No explanation is available for this question!


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