Ammeters And Voltmeters Theory - 7 - MCQs with answers

Ammeters And Voltmeters Theory - 7 - MCQs with answers

Q1. A Kelvin’s multicellular voltmeter has a torsion head and a coach spring for

A. Protection against accidental fraction of suspension due to vibration

B. For zero adjustment

C. Torsion head for zero adjustment and coach spring for Protection against accidental fraction of suspension due to vibration

D. Torsion head for Protection against accidental fraction of suspension due to vibration and coach spring for zero adjustment

View Answer / Hide Answer

Q2. Electrostatic voltmeter instruments are suitable for

A. Ac work only
B. Dc work only
C. Both ac and dc work
D. None of these

View Answer / Hide Answer

Q3. If an electrostatic voltmeter is used on ac circuit and has non uniform waves, then it will read

A. Average values
B. RMS values
C. Peak values
D. All of these

View Answer / Hide Answer

Q4. In electrostatic instruments iron is not used in their construction. These instruments are

A. Free from hysteresis and eddy current losses
B. Free from temperature errors
C. Dependent on temperature errors
D. Both (a) and (b)

View Answer / Hide Answer

Q5. The multiplying factor of electrostatic voltmeters is given by

A. (C + C_v) / C

B. (C + C_v) / C_v

C. C / (C+C_v)

D. C_v / (C+ C_v)

View Answer / Hide Answer

Q6. The range of electrostatic voltmeter can be extended by using

A. Resistance potential divider method
B. Capacitance potential divider method
C. Both (a) and (b)
D. None of these

View Answer / Hide Answer

Q7. The resistance potential divider method and capacitance potential divider method is used for

A. Both ac and dc

B. Former method can be used for both ac and dc and the later method can be used only for ac

C. Former method can be used for ac only and the later method can be used for both ac and dc

D. Former method can be used for dc only and the later method can be used only for ac

View Answer / Hide Answer

Q8. The indicating instruments with linear scale is

A. PMMC
B. Electrostatic instrument
C. Dynamometer instrument
D. Thermocouple instrument

View Answer / Hide Answer