Electrical Measuring Instruments MCQs | Electrical Measuring Instruments Short Questions(MCQs) & Answers

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Questions
41 Commonly used standard capacitor is
A spherical type
B concentric cylindrical type
C electrostatic type
D multilayer parallel plate type

Answer: concentric cylindrical type
42 A multirangq instrument has
A multiple shunt or series resistances inside the meter
B multicoii arrangement
C variable turns of coil
D multi range meters inside the measurement system

Answer: multiple shunt or series resistances inside the meter
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43 An instrument transformer is used to extend the range of
A induction instrument
B electrostatic instrument
C moving coil instrument
D any of the above

Answer: induction instrument
44 The power of a n-phase circuit can be measured by using a minimum of
A (n - 1) wattmeter elements
B n wattmeter elements
C (n + 1) wattmeter elements
D 2n wattmeter elements

Answer: (n - 1) wattmeter elements
45 The principle on which vector voltmeter is based is
A that it works on the principle of complex variation
B that it measures the response of linear ramp voltage
C same as digital meter
D that it measures the amplitude of a single at two points and at the same time measures their phase difference

Answer: that it measures the amplitude of a single at two points and at the same time measures their phase difference
46 To avoid the effect of stray magnetic field in A.C. bridges we can use
A magnetic screening
B Wagner earthing device
C wave filters
D any of the above

Answer: magnetic screening
47 In a single phase power factor meter the phase difference between the currents in the two pressure coils is
A exactly 0°
B approximately 0°
C exactly 90°
D approximately 90°

Answer: exactly 90°
48 In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of
A 0.1 Hz
B 0.25 Hz
C 0.5 Hz
D 1.5 Hz

Answer: 0.5 Hz
49 A Weston frequency meter is
A moving coil instrument
B moving iron instrument
C dynamometer instrument
D none of the above

Answer: moving iron instrument
50 The desirable static characteristics of a measuring system are
A accuracy and reproducibility
B accuracy, sensitivity and reproducibility
C drift and dead zone
D static error

Answer: accuracy, sensitivity and reproducibility
51 Operating torques in analogue instruments are
A deflecting and control
B deflecting and damping
C deflecting, control and damping
D vibration and balancing

Answer: deflecting, control and damping
52 Alternating current is measured by
A induction ammeter
B permanent magnet type ammeter
C electrostatic ammeter
D moving iron repulsion type voltmeter

Answer: induction ammeter
53 Most sensitive galvanometer is
A elastic galvanometer
B vibration galvanometer
C Duddlb galvanometer
D spot ballistic galvanometer

Answer: spot ballistic galvanometer
54 Wattmeter cannot be designed on the principle of
A electrostatic instrument
B thermocouple instrument
C moving iron instrument
D electrodynamic instrument

Answer: moving iron instrument
55 Various adjustments in an energy meter include
A light load or friction
B lag and creep
C overload and voltage compensation
D all of the above

Answer: Mandalams, Nadu, Kurram & Valanadu
56 To measure radio frequency, the suitable frequency meter is
A Weston frequency meter
B reed vibrator frequency meter
C heterodoxy frequency meter
D electrical resonance frequency meter

Answer: heterodoxy frequency meter
57 Which of the following is measured by using a vector voltmeter ?
A Amplifier gain and phase shift
B Filler transfer functions
C Complex insersion loss
D All of the above

Answer: All of the above
58 In an energy meter braking torque is produced to
A safe guard it against creep
B brake the instrument
C bring energy meter to stand still
D maintain steady speed and equal to driving torque

Answer: Maurya
59 Two holes in the disc of energy meter are drilled at the opposite sides of the spindle to
A improve its ventilation
B eliminate creeping at no load
C increase its deflecting torque
D increase its braking torque

Answer: eliminate creeping at no load
60 The rectifier instrument is not free from
A temperature error
B wave shape error
C frequency error
D All of the above

Answer: frequency error

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