Quiz: Electrical Engineering 15 Apr 2021

Quiz: Electrical Engineering
Topic: Miscellaneous

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

Q1. The starting torque of a wound rotor induction motor can be increased by adding:
(a) External inductance to the rotor circuit
(b) External capacitance to the rotor circuit
(c) External resistance to the rotor circuit
(d) A combination of inductance and capacitance to the rotor circuit

Q2. For a slip ring induction motor if the rotor resistance is increased the
(a) Starting torque and efficiency increases
(b) Starting torque increases but efficiency decreases
(c) Starting torque and efficiency decreases
(d) Starting torque decreases but efficiency increases

Q3. For a bipolar junction transistor, common base current gain is 0.98 and the base current is 120μA. Its common emitter current gain will be:
(a) 98
(b) 56
(c) 49
(d) 118

Q4. A sinusoidal voltage V=50 sinωt is applied to a series RL circuit. The current in the circuit is given by I=25 sin⁡(ωt-53^0 ). The apparent power consumed by the load is
(a) 375 VA
(b) 625 VA
(c) 2500 VA
(d) 750 VA

Q5. If three amplifiers having the same bandwidth are cascaded, the bandwidth of the resulting amplifier will be
(a) Better than that of each stage
(b) Worse than that of each stage
(c) Same as that of each stage
(d) None of the above

Q6. In short transmission line, the effects of _ are neglected: –
(a) resistance
(b) inductance
(c) capacitance
(d) All of the above

Q7. Which of the following relation is correct for current carrying capacity of fuse element?
(a) I ∝ d
(b) I² ∝ d²
(c) I² ∝ d³
(d) I² ∝ d
Where d = diameter of fuse element

Q8. For protection of transformer against all kinds of incipient faults, which relay is used:
(a) Buchholz relay
(b) Earth-fault relay
(c) Over current relay
(d) All of the above

Q9. For handling greater currents induction wattmeter are used in conjunction with
(a) power transformer
(b) current transformer
(c) potential transformer
(d) all

Q10. The armature torque of the DC shunt motor is proportional to
(a) armature current only
(b) field flux only
(c) both a and b
(d) none



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