Top 150+ Solved Electromagnetic Interference MCQ Questions Answer
Q. Moving Iron instruments can be used on:
a. ac and dc both
b. ac only
c. dc only
d. none of the above
Q. In spring control instruments, controlling torque:
a. can be adjusted easily
b. cannot be adjusted easily
c. remains the same
d. varies with the load
Q. Chemical effect is used for the operation of:
a. voltmeter
b. ammeter
c. ampere hour meter
d. kwh meter
Q. The deflection torque can be produced by:
a. gravity control
b. spring control
c. air friction
d. magneitcally
Q. Moving coil instruments are:
a. permanent magnet type
b. dynamometer type
c. induction type
d. permanent magnet and dynamometer type
Q. For increasing the range of an ammeter, connect:
a. a high value resistance in series with the ammeter coil
b. a high value resistance in parallel with the ammeter coil
c. a low value resistance in parallel with the ammeter coil
d. a low value resistance in series with the ammeter coil
Q. A galvanometer can be used for measuring current and voltage of a circuitby:
a. shunt only
b. connecting high value of resistance in series only
c. shunt for measuring current and high resistance in series for voltage
d. without shunt and series resistance
Q. The energy consumption of MI instrument as compared to MC instrument is:
a. same
b. more
c. less
d. very small
Q. An ammeter requires a change of 4A in its coil to produce a pointer deflectionof 8mm then its sensitivity is
a. 2.5 mm/a
b. 2.0 mm/a
c. 0.5 mm/a
d. none of the above
Q. Electrostatic type instruments are mainly used for measurement of
a. heavy currents
b. low currents
c. low voltages
d. high voltages
Q. Measurement range of a voltmeter can be extended by using:
a. high current resistance
b. high series resistance
c. low shunt resistance
d. low series resistance
Q. Which of the following voltmeter have least power consumption:
a. moving iron
b. hot-wire
c. electrostatic
d. induction type
Q. Which of the following instruments have least torque/weight ratio:
a. dynamometer type
b. pmmc
c. attraction type moving iron
d. repulsion type moving iron
Q. Fluid friction damping can be used in
a. horizontally mounted instruments
b. vertically mounted instruments
c. both horizontally mounted instruments and vertically mounted instruments
d. none of the above
Q. The ratio and phase angle errors in potential transformer may be reduced by
a. increasing the exciting current
b. increasing the resistance and leakage reactance in the transformer
c. by not employing turns compensation
d. none of the above