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MCQs 1: The current sensitive instruments are

PMMC Hot wire instruments Electrostatic instruments Both (a) and (b)
Answer Explanation

MCQs 2: Power consumption in permanent magnet moving coil instrument and hot - wire instruments are

Low, low Low, high High, low High, high
Answer Explanation

MCQs 3: In the given frequency range, which type of instrument will have highest accuracy

electrodynamometer hot - wire instrument electrostatic instrument PMMC
Answer Explanation

MCQs 4: Megger is a portable instrument. It is used for the measurement of

Low inductance Low resistance High inductance High resistance
Answer Explanation

MCQs 5: In a portable instrument, the effect of stray magnetic field on actuating torque will be maximum when the operating field and stray fields are

Parallel to each other Perpendicular to each other Inclined at 45 degree Opposite to each other
Answer Explanation

MCQs 6: The thermocouple instruments works on the principle of Seebeck effect. The amount of heat produced is

Directly proportional to the current Directly proportional to the square of current Inversely proportional to the current Inversely proportional to the square of current
Answer Explanation

MCQs 7: The thermocouple ammeter scale is

Linear Cramped at low end and open at high end Open at low end and cramped at high end Cramped at the middle
Answer Explanation

MCQs 8: The heater wire of thermocouple instruments are made of smaller area of cross section to

reduce the skin effect reduce temperature error reduce frequency error increase inductance
Answer Explanation

MCQs 9: In a Wheatstone bridge, if P = 10 ± 1%, Q = 100 ± 1%, R = 20 ± 1% and S is unknown then the unknown resistance will be

200 ± 1% 200 ± 2% 200 ± 3% 100 ± 1%
Answer Explanation

MCQs 10: A highly sensitive galvanometer is used in Wheatstone bridge and it can detect a current as low as 80 pA. The resistances of each arm of bridge are 800 ohm and the resistance of galvanometer is 40 ohm. If an input of 20 V is applied to the bridge then the smallest change in resistance which can be detected is

10.752 μA 15.280 μA 17.351 μA 23.719 μA
Answer Explanation

MCQs 11: The method / methods suitable for the measurement of low resistance is / are

Ammeter - voltmeter method Kelvin’s double bridge method Potentiometer method All of these
Answer Explanation

MCQs 12: The bridge suitable for the measurement of capacitance is / are

Anderson’s bridge Hay’s bridge Owen’s bridge None of these
Answer Explanation

MCQs 13: Schering bridges are used for the measurement of

Unknown capacitance Dielectric loss Power factor All of these None of these
Answer Explanation

MCQs 14: The AC Bridge which is used for the measurement of frequency is

Schering bridge Wien bridge Hay’s bridge Anderson bridge
Answer Explanation

MCQs 15: In L - C connected wattmeter, compensated coil is used. The error in the wattmeter is due to power consumed by the

Current coil Potential coil Inductor Capacitor
Answer Explanation

MCQs 16: The full scale current of a galvanometer with internal resistance of 800 ohm is 8 A. what will be the multiplying power of 80 ohm shunt with this galvanometer?

8 9 10 11
Answer Explanation

MCQs 17: If the reading of the two wattmeters is equal and opposite while measuring power in a 3 phase induction motor then the power factor of the load will be

Unity Zero 0.5 lagging 0.5 leading
Answer Explanation

MCQs 18: During load test on 3 phase induction motor, the readings of the two wattmeters are -5.5 kW and +12.5 kW respectively. If the line voltage is 420 V then the line current will be

38.91 A 41.02 A 42.10 A 43.94 A
Answer Explanation

MCQs 19: The transformer ratio of the transformer depends upon the

Exciting current Secondary current Power factor of secondary circuit All of these
Answer Explanation

MCQs 20: Primary current in a current transformer is determined by

The load on the system The load on its own secondary The load on its own primary All of these
Answer Explanation

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