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WorksheetsElectrical Installation T3 Q1 Principles of electric motor
Total questions: 25
Worksheet time: 25mins
The image shows a
block diagram
schematic diagram
circuit diagram
ladder diagram
The image shows a
block diagram
schematic diagram
circuit diagram
ladder diagram
1. pressure switch
2. cam switch
3. float switch
4. thermostats
Give two ways you can reverse the direction of a basic dc motor?
Reverse the current
Keep the current the same
Reverse the magnetic field
Keep the magnetic field the same
The purpose of overload protection on a motor is to protect the
Wire from high currents.
Motor from ground faults.
Motor from mechanical overload.
Motor from short circuits.
Thermal overload relays react to
High ambient temperatures and excessive current due to overloading
Heavy mechanical loads
Heavy electrical loads.
Rising starting currents.
The symbol show is of:
Push-Buttons Switch
Limit Switch NC
Magnetic Contactor Coil
Three Phase Induction Motor
Coasting is one of the methods of:
a) Starting the motor
b) Stopping the motor
c) Providing motor protection
d) Motor operational control
The Fuses and circuit breakers are generally used for :
a) Overload Protection
b) Over Current Protection
c) Environment Protection
d) Jogging.
Horizontal lines in a relay logic diagram that have input devices and an output device.
a) Rungs
b) Rails
c) Relay coil
d) Contact
Analyze the following relay logic circuit, completing the truth table accordingly
if A=0 and B=0, the light is on
if A=0 and B=1, the light is on
if A=1 and B=0, the light is on
if A=1 and B=1, the light is on
