Quiz: Electrical Engineering 15 Mar 2021

Quiz: Electrical Engineering
Topic: Miscellaneous

Each question carries 1 mark.
Negative marking: 1/3 mark
Time: 10 Minute

Q1. Out of the following, which one is correct in case of a circuit breaker?
(a) Breaking capacity=2.55× making capacity
(b) Making capacity= 2.55 × breaking capacity
(c) Breaking capacity=1.88 × making capacity
(d) Making capacity= 1.88 × breaking capacity

Q2. Switching surges and resonance can cause……………
(a) Low voltage
(b) Over voltage
(c) Both low voltage and over voltage
(d) None of the above

Q3. Match list-I(Relays) with list-II(Protection) and select the correct answer using the codes given below the lists:
List-I List-II
A. Buchholz relay 1. Feeder
B. Translay relay 2. transformer
C. Directional over current relay 3. Ring main distributor
4. Long overhead transmission line

(a) 2 3 4
(b) 4 3 2
(c) 2 1 3
(d) 2 3 1

Q4. If rotor speed of an induction motor is 480 rpm and rotor gross output is 2000 W, the magnitude of shaft torque developed is:
(a) 41.89 Nm
(b) 31.14 Nm
(c) 36.67 Nm
(d) 39.80 Nm

Q5. A 3-phase, 50 Hz induction motor draws 50 KW from the mains. If the stator losses are 2 KW and rotor emf oscillates at 100 oscillations per minute, the rotor copper losses will be:
(a) 1.2 KW
(b) 1.6 KW
(c) 1.8 KW
(d) 1.9 KW

Q6. Which lamps can be directly connected to a solar cell?
(a) Incandescent
(b) Metal Halide
(c) Compact Fluorescent
(d) LED

Q7. The power developed by salient pole synchronous machine is/are
(a) Excitation power only
(b) Power due to saliency or reluctance only
(c) Both a & b
(d) None of the above

Q8. In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is
(a) Zero
(b) Maximum
(c) Infinite value
(d) Any of the above

Q9. A 50 Hz transformer having equal hysteresis and eddy current losses at rated excitation is operated at 45 Hz at 90% of its rated voltage. Compared to rated operating point, the core losses under this condition;
(a) Reduce by 10 %
(b) Reduce by 19 %
(c) Reduce by 14.5 %
(d) Remains unchanged

Q10. A DC ammeter has a resistance of 0.1 Ω and its current range is 0-100 A. If the range is to be extended to 0-500 A, the meter requires which of the following shunt resistance?
(a) 0.010 Ω
(b) 0.011 Ω
(c) 0.025 Ω
(d) 1.0 Ω



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