Test and Measurements

61. What CRT element provides for control of the number of electrons passing farther into the tube?

1. Cathode
2. Control grid
3. Anode
4. Phosphor screen

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62. What dc bridge is widely used for the accurate measurements of resistance?

1. Owen bridge
2. Hay bridge
3. Potentiometer bridge
4. Wheatstone bridge

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63. What element of a CRT releases electrons when heated indirectly by a filament?

1. Cathode
2. Grid
3. Anode
4. Phosphor screen

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64. What force in analog instrument quickly brings the moving system to rest in its final position?

1. Damping force
2. Controlling force
3. Deflecting force
4. Force at rest

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65. What has a series RC combination in one arm and a parallel RC combination in the adjoining arm and used as a notch filter in harmonic distortion analyzer?

1. Wien bridge
2. Maxwell bridge
3. Kelvin bridge
4. Hay bridge

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66. What instrument is used for measuring the amount of current flowing in a circuit?

1. Voltmeter
2. Ammeter
3. Oscilloscope
4. Meter amperage

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67. What instrument is used for observing voltage and current waveforms?

1. Multimeter
2. DMM
3. Oscilloscope
4. Telescope

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68. What instrument which springs provide the controlling torque as well as serve to lead current into and out of the operating coil?

1. Moving-iron
2. Permanent-magnet
3. Hot-wire
4. Iron-wire

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69. What is the period of a repetitive signal?

1. One-fourth cycle of the waveform
2. Two cycles of the waveform
3. One cycle of the waveform
4. One-half cycle of the waveform

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70. What is the reason why the scale of a permanent-magnet moving coil instrument is uniform?

1. Because of effective eddy current damping
2. Because external magnetic field has no effect
3. Because it is spring controlled
4. Because it has no hysteresis loss

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