Measurement and Instrumentation

21. An induction wattmeter can be used for

1. both D.C. and A.C.
2. D.C. only
3. A.C. only
4. any of the above

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22. An instrument transformer is used to extend the range of

1. induction instrument
2. electrostatic instrument
3. moving coil instrument
4. any of the above

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23. An ohmmeter is a

1. moving iron instrument
2. moving coil instrument
3. dynamometer instrument
4. none of the above

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24. Basically a potentiometer is a device for

1. comparing two voltages
2. measuring a current
3. comparing two currents
4. measuring a voltage

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25. ccording to application, instruments are classified as

1. switch board
2. portable
3. both (a) and (b)
4. moving coil

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26. Commonly used instruments in power system measurement are

1. induction
2. moving coil or iron
3. rectifier
4. electrostatic

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27. Commonly used standard capacitor is

1. spherical type
2. concentric cylindrical type
3. electrostatic type
4. multilayer parallel plate type

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28. Damping of the Ballistic galvanometer is made small to

1. get first deflection large
2. make the system oscillatory
3. make the system critically damped
4. get minimum overshoot

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29. E.m.f. of a Weston cell is accurately measured by

1. electrostatic voltmeter
2. hot wire voltmeter
3. isothermal voltmeter
4. electrodynamic voltmeter

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30. For handling greater currents induction wattmeters are used in conjunction with

1. potential transformers
2. current transformers
3. power transformers
4. either of the above

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