Quiz: Electrical Engineering 01 Apr 2021

Quiz: Electrical Engineering
Exam: RVUNL-JE
Topic: Miscellaneous

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

Q1. The rotor input when rotor copper loss in an induction motor is 600 W and slip 3 % is:
(a) 18 kW
(b) 20 kW
(c) 25 kW
(d) 200 kW

Q2. If a 500 KVA, 200 Hz transformer is operated at 50 Hz, its KVA rating will be:
(a) 125 KVA
(b) 250 KVA
(c) 1000 KVA
(d) 2000 KVA

Q3. In a 3-phase induction motor, the mechanical power developed, in terms of air gap power P_g is:
(a) sPg
(b) Pg/s
(c) (1-s) Pg
(d) Pg/(1-s)

Q4. The mutual inductance between two coils having self -inductances 3 H and 12 H and coupling coefficient is 0.85:
(a) 1.7 H
(b) 5.1 H
(c) 12.75 H
(d) 0.425 H

Q5. The capacitance measured between any two cores of a 3-core cable with the sheathed earthed is 3 µF. The capacitance per phase will be
(a) 1 µF
(b) 3 µF
(c) 9 µF
(d) 6 µF

Q6. In the given circuit, if the power consumed by 5Ω resistor is 10 watts, then power factor of the circuit is

(a) 0.8
(b) 0.6
(c) 0.5
(d) zero

Q7. For a series as well as parallel circuit
(a) Resistances are additive
(b) Powers are additive
(c) Currents are additive
(d) Voltage drops are additive

Q8. Four 100 W bulbs are connected in parallel across 200 V supply line. If one bulb gets fused.
(a) No bulb will light
(b) All the four bulbs will light
(c) Rest of the three bulbs will light
(d) None of the above

Q9. The insulation resistance of a cable of length 10 Km is 1 MΩ. Its resistance for 50 Km length will be
(a) 1 MΩ
(b) 0.5 MΩ
(c) 0.2 MΩ
(d) None of these

Q10. For a circuit given that I = 2 ± 5 % A, R = 100 ± 0.2 % Ω the limiting error in the power dissipation I2 R in the resistor R is
(a) 1.2 %
(b) 5.2 %
(c) 10.2 %
(d) 25.2 %

SOLUTIONS

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