#1 Which of the following cannot be described as the advantage of moving coil permanent magnet type instrument?

they have low torque/weight ratio

#2 Which type of damping is generally preferred in case of instruments having weak magnetic field?

air friction damping

#3 132 kV AC voltage can be measured by

electro static voltmeter.

#4 In which instruments the deflecting torque depends on frequency

induction type instruments.

#5 On account of the effect of the inductance in pressure coil, the wattmeter at leading power factor tends to read

low

#6 To measure the voltages and currents in the radio frequency range, suitable instrument is

electro-thermic type

#7 When a 10 µF capacitor is connected across the terminals of an ohm meter, the instrument initially shows low resistance and then slowly the value of resistance rises to a very high value. What conclusion can be drawn about the condition of capacitor?

the capacitor is straight

#8 . A permanent magnet moving coil type ammeter and a moving iron type ammeter are connected in series with the output of a half wave rectifier. If the moving iron type instrument reads 5 amperes then moving coil type instrument is likely to be

5 A

#9 Thermocouples are generally used for accurate temperature measurements up to

1600

#10 The commonly used material for thermocouple is

any of the above

#11 Bolometers are used for the measurement of

thermal radiations

#12 A bolometer is an element which

senses optical input and delivers thermal output

#13 Least expensive instrument for DC measurement is

attraction type moving iron instrument

#14 To double the current range of a 50 µA 2000 Ω meter movement, the shunt resistance required is

2000 Ω

#15 Which voltmeter has the least power consumption?

Electrostatic type

#16 . Which of the following instrument can be used for the measurement of temperatures above 1500 K ?

thermo-electric pyrometer

#17 Meter range is normally so selected that the indications are obtained

at the middle of the scale

#18 Ideally the internal resistance of an ammeter should be

zero

#19 . In two wattmeter method, if one of the wattmeter shows negative reading, the power factor of the load should be

lagging

#20 The scale of a wattmeter gives maximum indication of 100. The current and voltage ranges are 10 A and 220 V. The multiplication factor is

22

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Categories: MCQ

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