Rod, pipe, and plate electrodes must have a resistance to ground of at least _____.
a. 25 ohms or less
b. 35 ohms or less
c. 45 ohms or less
d. 75 ohms or less
a. 25 ohms or less
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The coolant heat storage system is being discussed. Technician A says that the water valve is driven by an electric motor. Technician B says that the storage tank has its own electric water pump. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
Why don't variable-air-volume zone systems need any method of controlling excess air?
A) The fans used are not capable of producing excess air. B) Any excess air is automatically diverted outside. C) All the dampers pass a little air, even when they are closed. D) They reduce the system airflow to match the number of zones calling.
With the Volts/Div. switch set to 2 mV, a sine wave measures 6.3 blocks with a 1x probe. The rms value of this sine wave is ____.
A. 4.45 mV B. 6.3 mV C. 44.5 mV D. 12.6 mV
What is generally considered to be the major cause of clutch failure?
A. excess heat B. excess vibration C. lack of lubrication D. all of the above