The duty cycle of an astable multivibrator is the ratio of time the output is ____________________ (low, high) to the total time of one cycle.
Fill in the blank(s) with the appropriate word(s).
high
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Which of the following is true about a battery?
A. The liquid inside is not corrosive. B. It contains electrolytes. C. Disconnect the positive battery cable first. D. It produces hydrogen, which is flammable.
Heat emitters that use fans or blowers to force air through a heat exchanger are usually called fan coils or air ____.
a. handlers b. tunnels c. wavers d. blowers
Most hydrothermal plants in the U.S. are located in the state of _______________
Fill in the blank(s) with the appropriate word(s).
Technician A says that spark knock, ping, and detonation are different names for abnormal combustion. Technician B says that any abnormal combustion raises the temperature and pressure inside the combustion chamber and can cause severe engine damage. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician