What might be the problem if the furnace runs, but with short cycles?

What might be the problem if the furnace runs, but with short cycles?

A) Cracked heat exchanger B) Defective relay protector
C) Improper heat anticipator setting D) Defective fan controller

[Ques. 2] Normally, a split AC system that uses a fixed metering device can safely operate at temperatures:

A) Above 65F. B) Above 90F. C) Above 70F. D) Above 50F.

[Ques. 3] In an induced-draft gas furnace, the first component to energize on a call for heat is:

A) The hot surface igniter. B) The gas valve.
C) The induced-draft blower. D) The indoor blower.

[Ques. 4] What is the typical pressure setting for a relief valve at on a residential hot water boiler?

A) 15 psig B) 160 psig C) 12 psig D) 30 psig

[Ques. 5] What should be done if a furnace with a tripped primary control has oil is in the combustion chamber?

A) Burn off the excess oil using a propane torch before firing the furnace.
B) Clean out the oil before firing the furnace.
C) Disconnect the vent connector before firing the furnace to avoid soot accumulation in the vent.
D) Push the reset button and let the fire burn off the excess oil.

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What might be the problem if the furnace runs, but with short cycles?

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