Electrical Measuring Instruments MCQs | Electrical Measuring Instruments Multiple Choice Questions with Answers

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Questions
61 If a voltmeter is connected, like an ammeter in series to the load:
A The measurement reading will be too high
B Almost no current will flow in the circuit
C The meter will burn
D An instantaneously high current will flow

Answer: Almost no current will flow in the circuit
62 Preferred material for permanent magnet is:
A Stainless steel
B Alnico
C Tungsten steel
D Soft iron

Answer: Alnico
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63 PMMC instrument gives uniform scale because:
A It uses spring control
B It uses eddy current damping
C The deflection torque is proportional to the instrument current
D Both (a) and (c)

Answer: Both (a) and (c)
64 Maxwell-Wien bridge is used to measure:
A Inductance
B Capacitance
C Dielectric loss
D Frequency

Answer: Inductance
65 ____ factor is the ratio of total flux to the useful flux in a magnetic circuit:
A Form factor
B Leakage
C Utility
D Dispersion

Answer: Leakage
66 For eliminating the effect of earth capacitance from the bridge network we use:
A Wagner’s earthing device
B High voltage at low frequency
C Low voltage at high frequency
D Campbell-maxwell device

Answer: Wagner’s earthing device
67 The most commonly used null deflector in a power frequency ac bridge is a:
A Vibration galvanometer
B D’Arsanval galvanometer
C Ballistic galvanometer
D Tachometer

Answer: Vibration galvanometer
68 Loss of charge method is used to measure:
A Low R
B High R
C Low L
D High L

Answer: High R
69 Megger is an instrument used for the measurement of:
A High resistance and insulation resistance
B Medium resistance
C Low resistance
D Leakage current

Answer: High resistance and insulation resistance
70 Kelvin double bridge is best suited for the measurement of:
A Inductance
B Capacitance
C Low resistance
D High resistance

Answer: Low resistance

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