Question 1

A ____ thermostat wire can cause a bad connection that will cause the compressor to alternately start and stop.&#10;A) short&#10;B) loose&#10;C) long&#10;D) tight

Accepted Answer

A loose thermostat wire can cause a bad connection, leading to intermittent power supply to the compressor. This can cause it to start and stop repeatedly, which can damage the compressor over time. Short, long, or tight wires do not necessarily cause this issue.

Question 2

The delay-on-break short-cycle timer begins its timing sequence when the thermostat contacts close.

Accepted Answer

The delay-on-break short-cycle timer begins its timing sequence when the thermostat contacts open, not when they close. It's designed to prevent short cycling of the compressor by enforcing a delay before the compressor can restart.

Question 3

Short cycling is a condition that occurs when the compressor is turned off immediately after the pressure has been stabilized.

Accepted Answer

Short cycling refers to a condition where the compressor turns on and off more frequently than normal, often before the desired temperature or pressure level is maintained, not necessarily only after pressure has stabilized.

Question 4

The short-cycling timer is controlled by the ____.&#10;A) thermostat&#10;B) relay&#10;C) transformer&#10;D) motor

Accepted Answer

The short-cycling timer is designed to prevent a heating or cooling system from turning on and off too frequently, which can cause excessive wear and tear on the equipment. The thermostat is responsible for communicating with the short-cycling timer to control the frequency of the system's operation. Thus, the correct answer is A) thermostat.

Question 5

Short cycling can be acceptable in some cases.

Accepted Answer

Short cycling, which refers to an HVAC system turning on and off too frequently, is generally considered harmful as it can lead to increased wear and tear, reduced efficiency, and shorter system lifespan.

Question 6

After a compressor has been turned off, enough time should be permitted to pass to allow the ____ before it is restarted.&#10;A) pressure in the system to increase&#10;B) charge in the evaporator to reverse&#10;C) charge in the condenser to stabilize&#10;D) pressure in the system to equalize

Accepted Answer

After a compressor has been turned off, enough time should be permitted to pass to allow the pressure in the system to equalize before it is restarted. Restarting the compressor too soon can damage the compressor and the system. This is especially important in systems with high pressure differentials.

Question 7

Many short-cycle timers use electronic components to affect a time delay.

Accepted Answer

Many short-cycle timers do use electronic components, such as capacitors and transistors, to create a time delay.

Question 8

Electronic short-cycle timers can be obtained that operate as delay-on-make or as ____.&#10;A) delay-on-pass&#10;B) on-delay&#10;C) delay-on-break&#10;D) delay-on-check

Accepted Answer

The question states that electronic short-cycle timers can operate as delay-on-make. This means that the timer will delay turning on the load after the switch is initially closed. Therefore, the opposite operation would be delay-on-break, where the timer would delay turning off the load after the switch is opened. Option A (delay-on-pass) and Option D (delay-on-check) are not valid options for the operation of electronic short-cycle timers. Option B (on-delay) would be an incorrect choice because it does not describe the delay operation for the timer when using it in a short-cycle application.

Question 9

Some electronic controls combine more than one function in a single unit.

Accepted Answer

Many electronic controls are designed to combine multiple functions in order to save space and increase efficiency. For example, a thermostat may also include a timer function or a digital display to show the current temperature. This type of integration can make devices more versatile and user-friendly.

Question 10

The short-cycling timer is a cam-operated, motor driven, ____.&#10;A) on-delay timer&#10;B) digital timer&#10;C) delay-on-brake timer&#10;D) programmed timer

Accepted Answer

The short-cycling timer is cam-operated and motor-driven, which typically indicates that it is an on-delay timer.

Deck 36: The Short-Cycle Timer