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WorksheetsPLC and power electrical test
Total questions: 10
Worksheet time: 10mins
Sensors and switches are connected to the ________ of a PLC.
input module
output module
CPU
RAM
The following voltage is detected at the input of a PLC as logic 1.
240 volt AC
48 volt AC
48 volt DC
24 volt DC
If the input module is connected as common negative, the output module must be connected as common positive.
TRUE
FALSE
A START switch and STOP switch to control an electrical motor should have the following physical contacts.
START switch – Normally closed, STOP switch – Normally open
START switch – Normally open, STOP switch – Normally closed
START switch – Normally closed, STOP switch – Normally closed
START switch – Normally open, STOP switch – Normally open
The output module of a PLC can use the following components to switch an output.
Relay
Transistor
Both A & B
None of the above
A relay has a coil and a set of contacts.
TRUE
FALSE
A 3-phase supply is connected to a 3-phase motor via a contactor.
TRUE
FALSE
A motor overload protection is connected in parallel to the motor windings.
TRUE
FALSE
A 3-phase asynchronous motor produces torque when there is
no load
a slip
a phase failure
power failure
The power to an electric motor should cut OFF automatically (Trip) in the event of
Phase failure
Overload
Both A & B
None of the above
