Automatic Controls

The purpose of a heat anticipator is to ____.

• anticipate a rise in temperature

• keep the tstat warm

• reduce temperature swing

• make sure the xfmr does not overheat

The difference between system overshoot and system lag is called ____.

• room temperature

• temperature rise

• temperature swing

• room swing

What is meant by the term "detent"?

• a nice place to sleep outside

• the rapid opening and closing of contacts

• to avoid authority

• slow motion electrical contact

The heat anticipator in the thermostat control circuit in the heating mode is active when the ____.

• points are open

• points are closed

• fan is on

• fan is turned off

The heater in the thermostat control circuit in the cooling mode is active when the ____.

• points are open

• points are closed

• fan is on

• fan is turned off

To properly set the heat anticipator, the ____ must determine what the current flow is through the heating control circuit when the furnace is operating in a steady state condition.

• homeowner

• inspector

• electrician

• technician

Bellows, sensing bulb, and bimetal controls have heavier contacts and accommodate which type of "source"?

• low amperage

• low voltage

• high resistance

• high voltage

To obtain an accurate reading of a fluid in a large pipe, a technician should ____.

• use a laser gun

• use a permanently mounted thermometer in a well

• use a pocket thermometer

• use a thermal image device

A low pressure control has a "high event" and a "differential" setting. The technician wants the system to turn on at 28 psig and shut down at 2 psig. What would be the proper settings?

• High event: 28 psig, differential: 2 psig.

• High event: 2 psig, differential: 2 psig.

• High event: 28 psig, differential: 26 psig

• High event: 2 psig, differential: 28 psig.

If the suction pressure of a system is 65 psig and the oil pump outlet is 95 psig, what is the net oil pressure?

• 25psig

• 30psig

• 65psig

• 160psig