Electrical Engineering MCQ Questions and Answers
1- Which method of braking is generally used in elevators?
(A) Regenerative braking.
(B) Rheostatic braking.
(C) Plugging.
(D) Retrogenerative braking
2- If the air gap in an induction motor is increased,
(A) The magnetizing current of the rotor will decrease.
(B) The power factor will decrease.
(C) The motor speed will increase.
(D) The windage losses will increase.
3- Resistance earthing is employed for voltages between
(A) 3.3 and 11 kV
(B) 11 and 33 kV
(C) 33 and 66 Kv
(D) 66 and 132 kV
4- In a.c. welding, as the thickness of the part to be welded increases, which of the following should increase?
(A) Voltage
(B) Current
(C) Frequency.
(D) Voltage, current, and frequency
5- A circuit in which the output voltage remains constant irrespective of the value of the load resistance uses a
(A) Silicon diode.
(B) Zener diode.
(C) SCR
(D) Amplifier
6- The Q-meter works on the principle of
(A) Self-inductance.
(B) Mutual inductance.
(C) Series resonant circuit.
(D) Parallel resonant circuit.
7- All the instruments stated below are suitable for use for both a.c. and d.c except
(A) Moving Iron type.
(B) Hot wire type.
(C) Induction type.
(D) Dynamometer type.
8- The bridge used for the measurement of capacitance is
(A) Schering bridge.
(B) Anderson’s bridge
(C) Hay’s bridge.
(D) Maxwell’s bridge.
9- Hunting in a synchronous motor takes place when the
(A) Friction in the bearings is more.
(B) Air gap is less.
(C) Load is variable.
(D) Load is constant.
10- Piezoelectric transducer works under the variation of
(A) Intensity of light.
(B) Pressure intensity.
(C) Flow.
(D) Temperature.
11- The materials that are repelled by a magnet and whose relative permeability is less than one are called
(A) Paramagnetic materials.
(B) Ferromagnetic materials.
(C) Diamagnetic materials.
(D) Coercive materials.
12- Selection of one of the multiple inputs and transferring it to a common output is done by
(A) An analog multiplexer.
(B) A sample and hold circuit.
(C) An analog-to-digital converter.
(D) A de-multiplexer
13- Which device is used for the measurement of low pressure below atmospheric pressure?
(A) Pirani gauge.
(B) Compound gauge.
(C) Strain gauge.
(D) Ionization gauge.
14- An oscillator uses
(A) Positive feedback.
(B) Negative feedback.
(C) Both positive and negative feedback.
(D) No feedback.
ANSWERS:
1-(C), 2-(B), 3-(A), 4-(D), 5-(B), 6-(D), 7-(C), 8-(A), 9-(C), 10-(B), 11-(C), 12-(A), 13-(A), 14-(A)