Many technicians use a(n) ________ to measure all electrical characteristics.
A) ohmmeter B) multimeter C) voltmeter D) ammeter
[Ques. 2] An energy recovery ventilator:
A) Exchanges sensible heat between the intake and exhaust air streams.
B) Exchanges humidity between the intake and exhaust air streams.
C) Exchanges position between the intake and exhaust air streams.
D) Exchanges sensible heat and humidity between the intake and exhaust air streams.
[Ques. 3] Why do solenoid-type valves pose a problem for some types of burners?
A) Solenoids open and close too quickly.
B) Solenoids open and close too slowly.
C) Solenoids create too much pressure when closing.
D) Solenoids' seal is not strong.
[Ques. 4] The typical start up sequence for a hot surface ignition system is:
A) Combustion blower prepurge, igniter energized after a delay, gas valve energized after a delay, flames sensed, indoor blower energized after time delay.
B) Combustion blower, indoor blower, igniter, and gas valve all energized simultaneously.
C) Gas valve and igniter energized, flames sensed, combustion blower and indoor blower energized after time delay.
D) Combustion blower energized, igniter energized and gas valve energized, flames sensed, indoor blower energized after time delay.
[Ques. 5] A big reason that communicating systems improve efficiency is:
A) They monitor and correct power factor.
B) They can make intelligent decisions based on actual operating conditions.
C) They switch faster than relay systems.
D) Relays consume large amounts of power in conventional systems.
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