Quiz: Electrical Engineering 18 June 2020

Quiz: Electrical Engineering
Topic: Power System

Each question carries 1 mark.
Negative marking: 1/4 mark
Time: 10 Minute

Q1. The lightning arrestor is usually located nearer to
(a) bush bar
(b) Transformer
(c) circuit breaker
(d) isolator

Q2. The main function of relay is
(a) fault isolation
(b) fault detection
(c) fault prevention
(d) All of the above

Q3. Mho relay is normally used for the protection of
(a) long Transmission lines
(b) medium length line
(c) short length lines
(d) No length criteria

Q4. Earth fault relay are
(a) directional relays
(b) non-directional relays
(c) short operate time relays
(d) long operate time relays

Q5. The rating of Fuse is expressed in terms of
(a) amperes
(b) Volts
(c) VAR
(d) KVA

Q6. By burden of the relay we mean
(a) volt ampere rating of the relay
(b) current rating of relay
(c) voltage rating of relay
(d) watt rating of relay

Q7. In electric motor cooling; TEFC means
(a) total efficient fan cooled
(b) totally enclosed fan cooled
(c) thermal energy fan cooled
(d) tough energy fan cooled

Q8. The type of oil used in transformer is
(a) olive
(b) mineral
(c) coconut
(d) palm

Q9. In a synchronous motor hunting takes place
(a) when load varies
(b) motor is under loaded
(c) when power factor is unity
(d) when supply voltage fluctuates

Q10. If the field of a synchronous motor is under excited, the power factor will be
(a) lagging
(b) leading
(c) unity
(d) zero

S1. Ans. (b)
Sol. Transformer

S2. Ans. (b)
Sol. Fault detection

S3. Ans. (a)
Sol. Long transmission line

S4. Ans. (c)
Sol. Short operate time relay

S5. Ans. (a)
Sol. Ampere

S6. Ans. (a)
Sol. Volt ampere rating of relay

S7. Ans. (b)
Sol. totally enclosed fan cooled

S8. Ans. (b)
Sol. Mineral

S9. Ans. (a)
Sol. When load varies

S10. Ans. (a)
Sol. Lagging


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