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

Dear Readers, Welcome to Switchgear & Protection multiple choice questions and answers with explanation. These objective type Switchgear & Protection questions are very important for campus placement test, semester exams, job interviews and competitive exams like GATE, IES, PSU, NET/SET/JRF, UPSC and diploma.

Specially developed for the Electrical Engineering freshers and professionals, these model questions are asked in the online technical test and interview of many companies.

These tutorial are also important for your viva in university exams like Anna university, Pune, VTU, UPTU, CUSAT etc.

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

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
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__________.

- 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?

- 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?

- 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?

- 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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