#1 A pointer of an instrument once deflected returns to zero position, when the current is removed, due to

controlling torque

#2 An instrument in which the value of electrical quantity to be measured can be determined from the deflection of the instrument, when it has been pre-calibrated by comparison with an absolute instrument is known as

secondary instrument

#3 Damping torque in instruments is generally not produced

electro-statically

#4 Which of the following materials will be preferred as a shunt for extending the range of measurement of a voltmeter?

Manganin

#5 Low temperature coefficient of the resistance used for extending the range of a voltmeter

reduces inaccuracies due to the temperature variations

#6 The deflecting torque in an instrument may be produced

#7 To take-care the change in frequency of AC current, while using moving iron type instruments,

a condenser of suitable value is used in parallel with the swamp resistance

#8 A portable instrument is likely to have

eddy-current damping

#9 In eddy-current damping systems, the disc is usually made of

conducting and non-magnetic material

#10 In eddy-current damping systems, the disc is usually made of

conducting and non-magnetic material

#11 Which type of wattmeter cannot be used for both AC and DC?

induction type

#12 A moving iron type ammeter has few turns of thick wire so that

resistance is less

#13 A repulsion type ammeter when used on AC circuits, reads

RMS value of current

#14 If damping torque is not provided in an instrument

the pointer will oscillate about its final deflected position for quite time before comingĀ  to rest

#15 When the damping of an instrument is adjusted to enable the pointer to rise quickly to its deflected position without overshooting, in that case the instrument is said to be

dead beat

#16 When the damping force is more than the optimum, the instrument will become

slow and lethargic

#17 In a moving iron type ammeter, the coil has

few turns of thick wire

#18 In a repulsion type instrument, the force of repulsion is approximately proportional to

square of the current

#19 In moving iron type instruments because of the hysteresis in the iron parts of the moving system, the readings are

higher on descending values but lower on ascending values

#20 Magnetic shielding of the working parts is obtained by using

covering case of cast iron

#21 If the torque/weight ratio of an instrument is low, then it can be concluded that

sensitivity of the meter will be low

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Categories: MCQ

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