When coils are used in the injector driver units in truck ECMs, which of the following best describes their role?
A. isolation transformers
B. ignition coils
C. step-down transformers
D. step-up transformers
Answer: D
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Suppose a circuit is designed to turn off a compressor if the pressure in the system reaches a predetermined level. If the pressure becomes high enough to cause the pressure switch contacts to close, ____.
a. the CR relay coil is turned off b. the compressor motor will connected to an auxiliary power line c. a warning light will be turned on d. compressor is automatically restarted by the thermostat
How does an air sensing tstat keep frost from building up on a medium temperature evaporator?
a. It has a wide temperature swing to allow enough off time to defrost. b. It has a narrow temperature swing or differential to prevent frost buildup. c. The tstat won’t start the compressor until the frost has melted off the evap.
A transformer is used to match an amplifier with an 8-? load as shown in Fig. 13.118. The Thevenin equivalent of the amplifier is: VTh = 10 V, ZTh = 128 ?.
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Why might adjusting the oxygen flow during a brazing project by standing in front of the cylinder and slowly opening the valve all the way create a hazardous situation?
A) The valve should only be opened halfway. B) The valve should only be opened two-and-a-half turns. C) The valve should be opened quickly to relieve pressure. D) The valve should be opened while standing behind the cylinder.