Electrical Engineering MCQs [Quiz 25]

Q1. In an RL circuit, as the ratio of inductive reactance to resistance (XL/R) decreases, the phase angle
A. Increases
B. Decreases
C. Stays the same
D. Becomes alternately positive and negative

Q2. The best filter for a power supply is
A. a capacitor in series
B. a choke in series
C. a capacitor in series and a choke in parallel
D. a capacitor in parallel and a choke in series

Q.3 Voltage regulation can be achieved by a zener diode connected in
A. parallel with the filter output, forward biased
B. parallel with the filter output, reverse biased
C. series with the filter output, forward biased
D. series with the filter output, reverse biased

Q4. A current surge takes place when a power supply is first turned on because
A. the transformer core is suddenly magnetized
B. the diodes suddenly start to conduct
C. the filter capacitor must be initially charged
D. arching takes place in the power switch

Q5. A dc electromagnet
A. has constant polarity
B. Requires an air core
C. Cannot be used to permanently magnetize anything
D. Does not attract or repel permanent magnet

Q6. In a multi-stage RC coupled amplifier the coupling capacitor______________
A) Limits the low frequency response
B) Limits the high frequency response
C) Does not affect the frequency response
D) Block the DC component without affecting the frequency response

Q7. It is required to measure temperature in the range of 13000 deg C to 15000 deg c. The most suitable thermocouple to be used as a transducer would be?
a) chromel – constantan
b) Iron – constantan
c) chromel – alumel
d) platinum- rhodium

Q8. Telemetering is a method of?
a) Counting pulses sent over long distances
b) Transmitting pictures from one place to another
c) Transmitting information concerning a process over a distance
d) None

Q9. A dc to dc converter having an efficiency of 80% is delivering 16W to a load. If the converter is generating an output of 200V from an input source of 20V, then the current drawn from the source will be?
a) 0.1A
b) 0.5A
c) 1.0A
d) 10.0A
Q10. The location of lighting arrestor is?
a) Near the transformer
b) Near the circuit breaker
c) Away from the transformer
d) None

Updated: 25th July 2019 — 10:00 PM

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