Electrical Measuring Instruments Quiz | Electrical Measuring Instruments Objective Type Questions & Answers

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Questions
21 Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?
A Absolute instruments
B Indicating instruments
C Recording instruments
D Integrating instruments

Answer: Indicating instruments
22 A moving-coil permanent-magnet instrument can be used as flux-meter
A by using a low resistance shunt
B by using a high series resistance
C by eliminating the control springs
D by making control springs of large moment of inertia

Answer: by eliminating the control springs
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23 An induction meter can handle current up to
A 10 A
B 30 A
C 60 A
D 100 A

Answer: 100 A
24 Which of the following meters are not used on D.C. circuits
A Mercury motor meters
B Commutator motor meters
C Induction meters
D None of the above

Answer: Induction meters
25 The pointer of an indicating instrument should be
A very light
B very heavy
C either (a) or (b)
D neither (a) nor (b)

Answer: very light
26 An ammeter is a
A secondary instrument
B absolute instrument
C recording instrument
D integrating instrument

Answer: secondary instrument
27 A moving iron instrument can be used for
A D.C. only
B A.C. only
C both D.C. and A.C.
D None of these

Answer: both D.C. and A.C.
28 In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be
A unity
B 0.5
C 0.3
D zero

Answer: 0.5
29 For measuring a very high resistance we should use
A Kelvin's double bridge
B Wheat stone bridge
C Meggar
D None of the above

Answer: Meggar
30 The operating voltage of a meggar is about
A 6 V
B 12 V
C 40 V
D 100 V

Answer: 100 V
31 It is required to measure the true open circuit e.m.f. of a battery. The best device is
A D.C. voltmeter
B Ammeter and a known resistance
C D.C. potentiometer
D None of the above

Answer: D.C. potentiometer
32 In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be
A out of phase by 90°
B out of phase by 60°
C out of phase by 30°
D out of phase by 0°

Answer: out of phase by 90°
33 In an Anderson bridge, the unknown inductance is measured in terms of
A known inductance and resistance
B known capacitance and resistance
C known resistance
D known inductance

Answer: known capacitance and resistance
34 For measurement of mutual inductance we can use
A Anderson bridge
B Maxwell's bridge
C Heaviside bridge
D Any of the above

Answer: Heaviside bridge
35 If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is
A 10°
B 80°
C 120°
D 170°

Answer: 10°
36 In a Schering bridge the potential of the detector above earth potential is
A a few volts only
B 1 kV
C 5 kV
D 10 kV

Answer: a few volts only
37 A power factor meter has
A one current circuit and two pressure circuits
B one current circuit and one pressure circuit
C two current circuits and one pres¬sure circuit
D none of the above

Answer: one current circuit and two pressure circuits
38 In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at
A 0°
B 60°
C 90°
D 120°

Answer: 120°
39 In a Weston frequency meter, the magnetic axes of the two fixed coils are
A parallel
B perpendicular
C inclined at 60°
D inclined at 120°

Answer: perpendicular
40 The power factor of a single phase load can be calculated if the instruments available are
A one voltmeter and one ammeter
B one voltmeter, one ammeter and one wattmeter
C one voltmeter, one ammeter and one energy meter
D any of the above

Answer: one voltmeter, one ammeter and one wattmeter

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