Test and Measurements

21. Considered as the "heart" of the cathode ray oscilloscope.

1. Cathode ray tube (CRT)
2. Sawtooth generator
3. Horizontal amplifier
4. Vertical amplifier

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22. Current range extension in moving coil instruments can be achieved by placing a __________ in shunt with the instrument.

1. Low resistance resistor
2. High resistance resistor
3. High voltage transistor
4. Capacitor

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23. Disc is made of what material in eddy current damping?

1. Conductor and non-magnetic material
2. Conductor and magnetic material
3. Non-conductor and non-magnetic material
4. Non-conductor and magnetic material

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24. Dynamometer type instrument can be used for

1. ac work only
2. dc work only
3. both dc and ac work
4. neither dc nor ac works

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25. Electrostatic instruments are exclusively used as

1. voltmeters
2. ohmmeters
3. ammeters
4. wattmeters

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26. Fluid friction damping is employed in one of the following

1. Dynamometer wattmeter
2. Induction type energy meter
3. Hot-wire ammeter
4. Kelvin electrostatic voltmeter

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27. For amplitude measurements, what scale is calibrated in either volts per centimeter (V/cm), or milivolts per centimeter (mV/cm).

1. Horizontal
2. Diagonal
3. Vertical
4. Voltage

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28. For time measurements, __________ scale of the scope is used.

1. horizontal
2. diagonal
3. vertical
4. both vertical and horizontal

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29. Hot-wire instrument has a/an __________ scale.

1. uniform
2. squared
3. logarithmic
4. exponential

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30. How can electrical currents be inducted with a coil and a magnet?

1. By placing the coil parallel to the magnetic field
2. By placing the coil at right angles with the magnetic field
3. By moving either the magnet or the coil
4. By keeping the coil and the magnet perfectly stationary

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