Basic Timer Control: On-Delay and Off-Delay

One common method of unloading a compressor motor during startup is to use a control circuit with a timer relay. A. True B. False

A. True

An off-delay timer's contacts change to their energized state after the delay. A. True B. False

B. False

Which of the following is not a common timing mechanism used on timer relays? A. Motor-driven timers B. Hydraulic timers C. Pneumatic timers D. Solid-state timers

B. Hydraulic timers

Using timers to sequence the operation of a machine is called __________. A. Event-driven sequencing B. Time-driven sequencing C. Delay sequencing D. All of the above E. None of the above

B. Time-driven sequencing

Which of the following might cause the N.O. contact of a timer relay to be closed whether the coil is energized or not? A. Mechanical problem with the timer relay B. Contact is stuck closed C. Contact is shorted D. All of the above E. None of the above

D. All of the above