Ammeters And Voltmeters Theory - 6 - MCQs with answers

Ammeters And Voltmeters Theory - 6 - MCQs with answers

Q1. For reducing the errors in an induction instrument the alternating current to be measured has

A. Same frequency with which the instrument was calibrated
B. High frequency compared with which the instrument was calibrated
C. Low frequency compared with which the instrument was calibrated
D. None of these

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Q2. The frequency errors in induction instruments can be compensated by the use of

A. Non inductive shunt in both ammeters and voltmeters

B. Non inductive shunt in case of ammeters and are generally self compensated in case of voltmeters

C. Self compensated in case of both ammeters and voltmeters

D. Self compensated in case of ammeters and non inductive shunt in case of voltmeters

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Q3. The temperature errors in induction instruments can be compensated by

A. Hunting in both ammeters and voltmeters

B. Combination of shunt and swamping resistance in both ammeters and voltmeters

C. Hunting in case of ammeters and Combination of shunt and swamping resistance in case of voltmeters

D. Combination of shunt and swamping resistance in case of ammeters and hunting in case of voltmeters

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Q4. Which among the following is not true about the induction instruments?

A. It can be used for ac measurements only
B. Damping is very efficient in case of induction instruments
C. Compensation for frequency temperature is not required
D. Cost is relatively high

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Q5. In a moving coil of a meter swamping resistance is added to

A. Reduce the frequency error
B. Reduce the temperature error
C. Reduce the power consumption
D. All of these

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Q6. Swamping resistance is a resistance made up of

A. Alloy of manganin and copper
B. Alloy of aluminium and copper
C. Alloy of nickel and cobalt
D. Alloy of manganin and aluminium

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Q7. Electrostatic instruments are generally used as

A. Voltmeters
B. Ammeters
C. Wattmeters
D. Watt-hour meters

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Q8. In electrostatic voltmeters, the principle of their operation is the force of attraction between electric charges on neighboring plates between which potential difference is maintained. The attracted-disc type electrostatic instruments are used for the measurement of

A. Very low voltages
B. Low voltages
C. High voltages
D. Very high voltages

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