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WorksheetsQ3-Electrical Motor Control
Total questions: 10
Worksheet time: 15mins
Which of the following devices is not categorized as a control equipment or devices in a starter unit?
pushbutton switch.
thermal overload relay.
selector switch.
timer relay.
Which of the following procedures is not true about a remote switch?
It provides an automatic ON/OFF cycles of a starter unit.
It is connected in a main circuit of a starter unit.
There normally connected in series to each other in a control circuit.
It is operate due to setting point of temperature, level, flow or pressure.
A no-volt coil protection in the starter unit is used to
prevent auto restart after loss of supply due to power failure.
auto restart the starter unit after loss of supply due to power failure.
prevent manually restart after loss of supply due to power failure.
auto stop the starter unit after loss of supply due to power failure.
A protection device which break a supply to the control circuit of the starter unit when there is a short circuit fault occur is
thermal overload relay.
molded case circuit breaker.
control fuse or miniature circuit breaker.
earth leakage circuit breaker.
A red lamp is used to indicate
a motor is in trip condition.
a motor is in stop condition.
A motor is in stop and trip condition.
a motor is in operation condition.
Holding contact is provided by
limit switch normally close contact (LSc).
M contactor normally close auxiliary contact.
M contactor normally open auxiliary contact.
holding relay auxiliary normally open contact across the start button.
A delta connection is at the point
mark X.
mark W.
mark Z.
mark V.
What is the purpose of the contact mark X?
Break the supply when the timer coil is malfunction
Break the supply when both coils energize at same time
Provide an automatic stop due to setting time
Provide an electrical interlock system.
This starter can be used to open and close the motor operated valve (MOV).
Auto-transformer starter.
Star-delta starter.
Forward-reverse DOL.
Slip-ring starter.
Which of the following statements is not true about an auto-transformer starter?
Starting current value depend on transformer tapping voltage.
An auto-transformer is connected in parallel with main contactor.
It can using two or three contactors.
It is used for a three terminals three-phase motor.
