#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
#6 To measure the voltages and currents in the radio frequency range, suitable instrument is
#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
#9 Thermocouples are generally used for accurate temperature measurements up to
#10 The commonly used material for thermocouple is
any of the above
#11 Bolometers are used for the measurement of
#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
#15 Which voltmeter has the least power consumption?
#16 . Which of the following instrument can be used for the measurement of temperatures above 1500 K ?
#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
#19 . In two wattmeter method, if one of the wattmeter shows negative reading, the power factor of the load should be
#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
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