Practice - SACA - Timers

Which of the following is not a component of a time-delay relay?

• Coil

• Timing mechanism

• Alarm

• Contacts

An on-delay timer relay's contacts will not change states until _________.

• The coil has de-energized

• A predetermined time has elapsed

• The coil has been energized

• The circuit is turned off

The ________ timer operates in a manner that is opposite to the on-delay timer.

• Off-Delay

• Instantaneous

• Pneumatic

• Solid-state

In order to avoid seriously overheating the motor on a centrifugal air compressor at startup, it is recommended that _________.

• The motor be overhauled

• The motor be unloaded when started

• The oil be changed every week

• All of the above

• None of the above

One machine that uses a time-delay relay to perform a cylinder dwell is a(n) __________.

• Automatic carwash

• Centrifugal air compressor

• Plastic injection molding machine

• Washing machine

When time-delay relays are used in time-driven sequencing, they basically take the place of __________.

• Limit switches

• Start pushbuttons

• Stop pushbuttons

• Manual overrides