Test review True or False Chapters 12-20

True or False: The temperature drop below the thermostat’s set point is referred to as system lag.
True
True or False: Pressures below atmospheric pressure cannot be detected.
False
True or False: If the differential of a motor control is set too small, the motor may short cycle.
True
True or False: A change in the differential setting will automatically change the cut-in pain of the control.
False
True or false: A change in the differential of a control will always change the range of the control.
True
True or False: Changing the cut-out adjustments with out changing the differential adjustment will automatically change the cut-in setting.
False
True or False: The indoor fan must always run during the cooling cycle.
True
True or False: When the control transformer is not working, the indoor fan will not run in the FAN ON position.
True
True or False: When using a voltmeter for troubleshooting, any time the technician measures across the same line (whether it be line 1 to line 1 or line 2 to line 2), the voltage will always be zero.
True
True or False: Open switches will always read voltage.
True
True or False: Three-phase motors have low starting torque.
False
True or False: All large motors are three-phase.
True
True or False: All electric motors must be cooled or they will overheat.
True
True or False: An SCR is an electronic switch .
True
True or False: Three-phase motors are often used in air-conditioning systems in residences.
False
True or False: A contactor can alway be converted to a starter.
False
True or False: A motor can be restarted immediately after it has stopped or been overloaded.
False
True or False: If a sleeve bearing fails in a small, fractional horsepower motor, the motor is generally replaced.
True

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