Control Transformers and Voltage Testing

To avoid running separate lines to a machine for power devices and control devices, the higher voltage required by the power devices can be produced by using a control transformer to step up the control voltage

• a) True

• b) False

To get a control voltage of 120 VAC from a control transformer if the line voltage is 240 VAC, the primaries must be connected in series

• a) True

• b) False

To get a control voltage of 120 VAC from a dual-voltage control transformer if the line voltage is 480 VAC, the primaries must be connected in series

• a) True

• b) False

Most troubleshooters in manufacturing plants perform component level testing.

• a) True

• b) False

The process of finding the cause of a machine malfunction is called fault hunting

• a) True

• b) False

A solenoid's __________ can be checked with a machinist's rule

• a) Stroke length

• b) Magnetism

• c) Alignment

• d) Gap size

To determine if an indicator lamp has failed, measure the lamp's

• a) Brightness

• b) Amperage

• c) Resistance

• d) Voltage

The most likely cause of the problem when all of the contacts in an activated switch do not change status is __________

• a) A mechanical problem with the switch

• b) Switch contacts are shorted

• c) Switch contacts are open

• d) All of the above

• e) None of the above

To test a relay coil out-of-circuit, you would measure __________

• a) Voltage

• b) Resistance

• c) Current

• d) All of the above

• e) None of the above

A ladder diagram arranges the conductors in straight horizontal lines, like rungs on a ladder, with only outputs on each rung

• a) True

• b) False