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MCQs 1: The Q meter works on the principle of

Series resonance Parallel resonance Both (a) and (b) Neither series resonance nor parallel resonance
Answer Explanation

MCQs 2: In wattmeters, errors due to stray fields can be removed by

Proper instrument construction Using brake magnet Using shading ring Using two separate ac magnets
Answer Explanation

MCQs 3: A dynamometer type wattmeter reads 200W when its voltage coil is connected across the load whose voltage is 150 V. if the voltage coil has internal resistance of 1800 ohm, then the power taken by the load will be

163.8 W 171.7 W 178.9 W 187.5 W
Answer Explanation

MCQs 4: In a dynamometer type meter, the error due to connections would be minimum if

Capacitive reactance of pressure coil is greater than its inductive reactance Capacitive reactance of pressure coil is equal to its inductive reactance Capacitive reactance of pressure coil is lesser than its inductive reactance Capacitive reactance of current coil is equal to its inductive reactance
Answer Explanation

MCQs 5: To avoid wastage of power during calibration in dynamometer type wattmeter

Phantom loading is used Brake magnet is used Spring is used Capacitance is used
Answer Explanation

MCQs 6: In terms of the division on screen, the voltage of the waveform in CRO is

Average voltage RMS voltage Peak to peak voltage Maximum voltage
Answer Explanation

MCQs 7: The Lissajous patterns help in the measurement of

Phase difference between two sine wave Frequency of one waveform if the frequency of other waveform is known Both (a) and (b) None of these
Answer Explanation

MCQs 8: If the two input waveforms are of equal amplitude and 90 degree phase difference is applied to the CRO then the Lissajous patterns obtained will be

Straight line tilted at 45 degree with respect to X - axis Circle Ellipse Vertical straight line
Answer Explanation

MCQs 9: Turbine meters are generally preferred for

Low viscosity and high flow measurements High viscosity and low flow measurements High viscosity and high flow measurements Low viscosity and low flow measurements
Answer Explanation

MCQs 10: The flow meter which is replacing the differential pressure meters in its applications is

Vortex - shedding flow meters Electromagnetic flow meters Ultrasonic flow meters All of these
Answer Explanation

MCQs 11: Dipsticks are used for the

Pressure measurement Flow measurement Displacement measurement Level measurement
Answer Explanation

MCQs 12: In a ramp type DVM, the multivibrator determines the rate at which the

Clock pulses are generated Measurement cycles are initiated It oscillates Its amplitude varies
Answer Explanation

MCQs 13: In potentiometric type DVM, the adjustment of sliding contact is done by

A single phase servomotor Two phase servomotor Three phase servomotor All of these
Answer Explanation

MCQs 14: In case of motor meters, the speed of rotation is

Directly proportional to the current in case of ampere hour meter and to power in case of watt-hour meter Directly proportional to the current in case of ampere hour meter and inversely proportional to the power in case of watt-hour meter Inversely proportional to the current in case of ampere hour meter and directly proportional to the power in case of watt-hour meter Inversely proportional to the current in case of ampere hour meter and to power in case of watt-hour meter
Answer Explanation

MCQs 15: In motor meters, the speed control of the rotating system is done by using

Permanent magnet Train of gear wheels and dials Pinion All of these
Answer Explanation

MCQs 16: Commutator motor meters are

Ampere hour meter True watt - hour meter Either ampere hour meter or true watt - hour meter None of these
Answer Explanation

MCQs 17: The induction type single - phase watt - hour meters uses

Control spring Pointer Brake magnet and spindle All of these
Answer Explanation

MCQs 18: If one meter A requires 80 mA to give full scale deflection and another meter B requires 60 mA to give full scale deflection, then the

Meter A is more sensitive Both meters are equally sensitive Meter B is more sensitive Insufficient data
Answer Explanation

MCQs 19: To produce a change in deflection of 1.5 mm of the galvanometer of Wheatstone bridge, a change of 5 Ω in the unknown arm of bridge is required. The sensitivity is

0.2 mm / Ω 0.3 mm / Ω 0.4 mm / Ω 0.5 mm / Ω
Answer Explanation

MCQs 20: Resolution of an instrument is specified as an

Absolute value Percentage of full scale deflection Either (a) or (b) None of these
Answer Explanation

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