Valves that use motors that move in tiny increments are:

Valves that use motors that move in tiny increments are:

A) Electronic expansion valves. B) Pulse-modulated valves.
C) Cross-charged expansion valves. D) Step motor valves.

[Ques. 2] Which of the following types of valve is NOT considered an isolation valve?

A) Diaphragm valve B) Stem-type valve C) Solenoid valve D) Ball valve

[Ques. 3] Why is it recommended that an acetylene cylinder valve never be opened more than one-half turn?

A) To minimize the strain of the high cylinder pressures on the valve threads
B) To allow rapid shutoff in the case of an accident
C) To prevent the valve from getting stuck in the fully opened position
D) To regulate the pressure to the torch handle

[Ques. 4] The operation of a thermostatic expansion valve can best be described as:

A) Evaporator pressure = evaporator pressure + bulb pressure.
B) Bulb pressure + evaporator pressure = spring pressure.
C) Spring pressure = bulb pressure + evaporator pressure.
D) Bulb pressure = evaporator pressure + spring pressure.

[Ques. 5] Which of the following are used to separate and collect some of the oil in the discharge line as it leaves the compressor and then return it to the compressor's crankcase?

A) Oil separators B) Water separators
C) Heat separators D) Refrigerant separators

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Valves that use motors that move in tiny increments are:

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