What can be done to prevent ductwork from sweating?
A. Lower the thermostat setting.
B. Add dampers.
C. Insulate the duct.
D. Both a and c are correct.
Answer: C
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If the symbol shows the movable contact touching but below the stationary contact, this indicates that the switch is ____.
A. normally open held closed B. normally closed held open C. normally closed D. normally open
In response to a supposed Soviet threat to Middle Eastern oil, the American Central Intelligence Agency in 1953
A. began seeking alternative sources of energy. B. staged a coup to overthrow the Iranian government and install Shah Mohammed Reza Pahlevi as dictator-like monarch. C. engaged in sabotage against pro-Soviet governments in the region. D. developed close cooperation with Israeli intelligence agencies. E. gathered conclusive evidence of the Soviets' plans to control Egypt.
If the starter "whines" when engaged, which of these is a possible cause?
A) Worn leather armature brake B) Open pull-in winding C) Worn or defective starter drive D) Defective solenoid
What is interrupt-driven I/O and what is its major advantage?
A) An I/O device needing service sends a request to the PIC (programmable interrupt controller), which in turn notifies the CPU of the request based on the assigned priority level of the specific I/O device. If there are no pending I/O requests the CPU does not have to spend time checking the I/O ports. B) Each individual I/O device is checked sequentially on a regular basis to see if it needs to be serviced. This slows down the CPU operation. C) Individual I/O devices regularly send inquiries to the CPU to see if it is available for a specific I/O operation; if the CPU is available, the I/O device then proceeds to carry out its operation. D) Each individual I/O device is serviced sequentially on a regular basis by the PIC. This speeds up the I/O process.