Test and Measurements

31. If the pointer of an indicating instrument is in motion, then what opposes deflecting torque?

1. Controlling torque
2. Damping torque
3. Damping and controlling torques
4. Frictional torque

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32. In an oscilloscope, __________ __________ adjusts the brightness of the spot by changing the voltage on the control grid.

1. intensity control
2. focus control
3. astigmatism control
4. position control

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33. In VTVMs, __________ is used to balance both halves of the difference amplifier or cathode-coupled amplifier.

1. trigger adjust
2. scale
3. infinite adjust
4. zero adjust

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34. In VTVMs, __________ refers to the smallest signal that can be reliably measured.

1. threshold signal
2. minimum signal
3. sensitivity
4. input signal

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35. In Wheatstone bridge, bridge balance is considered where

1. There is no current that flows through the load
2. There is current that flows through the load
3. There is potential difference between load terminal
4. The galvanometer reading is maximum

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36. Indicating instrument is assumed to be most accurate at what part of the scale?

1. At beginning
2. At half of full
3. At ending
4. Any part

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37. Insulation resistance is measured by which meter?

1. Ohmmeter
2. Insulation meter
3. Wien bridge
4. Megger

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38. Majority of analog measuring instrument utilizes one of the following effects.

1. Heating effect
2. Electrostatic effect
3. Magnetic field
4. Chemical effect

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39. Maxwell bridge measures an unknown inductance in terms of known

1. resistance
2. frequency
3. inductance
4. capacitance

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40. Most AC voltmeters have an rms scale which is valid only if the input signal being measured is a __________ signal.

1. square wave
2. triangular
3. sawtooth
4. sinusoidal

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