Test and Measurements

81. What sensor provides a change of resistance with typical power range of 1μW to 10mW and with maximum frequency greater than 100GHz?

1. Thermal converter
2. Diode sensor
3. Thermocouple sensor
4. Thermistor sensor

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82. What sensor provides a dc voltage approximately 1 V at 10 mW?

1. Diode sensor
2. Thermocouple sensor
3. Thermal sensor
4. Thermistor sensor

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83. What type of instrument is the watt-hour meter?

1. An integrating
2. A recording
3. An indicating
4. A power meter

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84. What type of meter gives a precise reading on voltage, current or resistance where there is the generation of samples at the input and then feeds it to a digital read-out?

1. VOM
2. VTVM
3. DMM
4. DTMF

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85. When both deflecting and controlling torque act, the pointer of an indicating instrument comes to

1. Rest
2. Mid-position
3. Maximum position
4. Three-fourth position

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86. When current through the operating coil of a moving-iron instrument is tripled the operating force becomes

1. six times
2. one-half time
3. nine times
4. three times

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87. When should a fuse be replaced with a higher rated unit?

1. Never
2. When the original value is not available
3. If it blows
4. When fuses of the original value are small in size

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88. When the vertical input is 0V, the electron beam may be positioned at the __________ of the screen

1. top center
2. vertical center
3. horizontal center
4. bottom center

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89. Which dynamometer type has uniform scale?

1. Wattmeter
2. Voltmeter
3. Ammeter
4. Ohmmeter

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90. Which instrument is the most sensitive?

1. Moving-iron
2. Dynamometer
3. Hot-wire
4. Permanent-magnet moving coil

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