Test and Measurements

51. The output voltage of a thermocouple

1. Remains constant with temperature
2. Decreases with applied voltage
3. Increases with temperature
4. Increases with applied voltage

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52. The pointer of an indicating instrument is generally made of

1. Copper
2. Silver
3. Aluminum
4. Gold

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53. The pointer of an indicating instrument is the final deflected position, the __________ is zero.

1. Deflecting torque
2. Controlling torque
3. Damping torque
4. Frictional

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54. The resistance of a moving-coil instrument is 10 n and gives full-scale deflection at 10 mA. Calculate the resistance of the shunt required to convert the instrument to give full- scale detection when the circuit current is 5 A.

1. 0.02004 0
2. 0.20004 n
3. 1 n
4. 2.04 n

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55. The temperature coefficient of resistance of the shunt material is

1. negligible
2. negative
3. positive
4. infinite

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56. The time interval between pulses is called

1. Pulse frequency
2. Pulse delay
3. Pulse duration
4. Pulse period

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57. The time interval that a waveform is high (or low) is the of the __________ signal.

1. Pulse width
2. Pulse length
3. Pulse position
4. Duty cycle

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58. The typical power range of diode sensor is

1. 0.1μW to 10mW
2. 0.1pW to 10mW
3. 0.1mW to 100W
4. 0.lnW to l0mW

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59. What ammeter is used to measure high-frequency currents?

1. Hot-wire
2. Moving-iron
3. Dynamometer
4. Thermocouple

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60. What bridge is used to measure high-Q inductors (Q>10)?

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

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