If, while troubleshooting a residential central air conditioning system, the technician notices frost on the suction line, what is the most likely problem?
A. dirty air filter
B. defective condenser fan motor
C. dirty condenser
D. high superheat
E. normal operation
Answer: A
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If the time for one cycle is 0.1 second, the frequency is _____.
a. 0.1Hz b. 0.5Hz c. 1Hz d. 10Hz
The optimum reading for carbon monoxide in the delivered air stream is ___________.
a. less than 10 PPM b. less than 1 PPM c. less than .1 PPM d. zero
A concentric clutch is ________.
A) A type of wet clutch B) A type of dry clutch C) Also called a nested-type clutch D) Both A and C
The subsequent problems deal with the circuit below. Assume that when the transistor is in saturation, the collector-to-emitter drop is 0.2 V and the base-to-emitter forward bias voltage is 0.7 V. Assume that the forward bias voltage for the LED is 2 V.
If Vin=0V, what is the voltage at the base of the transistor?
A. 5 V B. 4.3 V C. 0.7 V D. 0.2 V E. 0 V