#1 Which of the following instruments can be used in ac bridges for low frequencies up to 200 Hz only?

vibration galvanometer

#2 Maxwell bridge is used to measure

Inductance

#3 A bridge used for measurement of capacitance is

Schering bridge

#4 Which of the following instruments can be used in AC bridges for the frequencies up to 100 kHz?

Tunable amplifier detector

#5 Hay’s bridge can be used for measurements on

high Q inductive circuits

#6 . Capacitor type potential divider is used to extend the range of which type voltmeter?

Electrostatic voltmeter

#7 . Which of the following frequency meters can be used for the measurement of radio frequency?

Heterodyne frequency meter

#8 One wattmeter method is used to measure power in a three phase circuit when

the load is balanced in all three phases

#9 Which method can be used to measure the power in a three phase unbalanced load system?

Two wattmeter method

#10 In the two wattmeter method if power factor is 0.5, then one of the wattmeters will read

zero

#11 Highest flux density exists inside which of the following instrument?

moving coil type instrument

#12 In a moving iron instrument 12 A current causes a deflection of the needle by 60 degrees. A deflection of 15 degrees will be obtained by a current of

6 A

#13 In a moving coil instrument 12 A current causes a deflection of the needle by 60 degrees. A deflection of 15 degrees will be obtained by a current of

3 A

#14 Which of the following instruments does not use the effect of current for measurement purposes?

Electrostatic ammeter

#15 The porpoise of providing a swamping resistance in a dynamometer type moving coil instruments is

to provide equal time constant for fixed coil and moving coil, when used for AC measurements

#16 . Which of the following instruments will be suitable for the measurement of temperature of a furnace?

Optical pyrometer

#17 An electrodynamic wattmeter is not considered suitable for low power factor circuits due to

power loss in voltage coil

#18 In a megger when not in operation, the needle shows a resistance of

Infinity

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Categories: MCQ

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