EEE MCQ: Switchgear and Protection - E Tips BD

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Monday, August 10, 2015

EEE MCQ: Switchgear and Protection

A switchgear or electrical switchgear is a generic term which includes all the switching devices associated with mainly power system protection. It also includes all devices associated with control, protecting (switches, relays, fuses or circuit breakers used to control & Protect), metering and regulating of electrical power system. Assembly of such devices in a logical manner forms a switchgear. This is a very basic definition of switchgear.
EEE Interview Tips. Important MCQ of Switchgear and Protection. Click "Answer", find right Answer-
Answer লেখা ইমেজে ক্লিক করলে উত্তর অপশন দেখাবে।
1) In a circuit breaker the current which exists at the instant of contact separation is known as....
A) surge current
B) breaking current
C) recovery current
D) re striking current

2) Bucholz relay used on..
A) Air cooled transformer
B) welding transformer
C) oil cooled transformer
D) All of above

3) The SF6 gas is...
A) non poisonous
B) non inflammable
C) insulating properties
D) none of above

4) The rating of a wire is always expressed in
A) Ampere-volt
B) Ampere
C) kW
D) all of above

5) Oil immersion of contacts is the method of
A) de ionization
B) arc prevention
C) arc dispersion
D) None of above.

6) Air blast circuit breakers for 400 kV. Power system are designed to operate in
A) 50 micro seconds
B) 50 milli seconds
C) both A and B
D) none of above

7) Which of the following contact point metals has the highest melting point?
A) Copper
B) silver
C) Gold
D) Tungsten

8) HRC fuses are....
A) High Rupturing Capacity fuse
B) Holding and Resisting current fuses
C) High Rating fuse
D) none of above

9) A fuse is normally a ...
A) voltage limiting device
B) current limiting device
C) power limiting device
D) all of above

10) A differential relay measures the vector difference between.
A) two voltages
B) two current
C) two or more similar electrical quantities
D) continious load

11) Thermal overload relays are used to protect the motor against over current due to
A) over heat
B) Short Circuit
C) heavy load
D) all of above

12) Which of the following circuit breakers produce least arc energy?/b>
A) Air blast
B) Oil Circuit breaker
C) Minimum oil
D) None of above

13) Which of the following is not a part of the circuit breaker?
A) Operating mechanism
B) conservator
C) Explosion pot
D) Fixed and moving contacts

14) A Merz-price protection is suitable for
A) Alternator
B) transmission line
C) Motor
D) Transformer

15) The over-voltage surges in power systems may be caused by
A) lightning
B) switching
C) resonance
D) all of above

See more 50 MCQ of AC Generator

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