List of top Electrical Technology Questions on Electrical Machines asked in CBSE CLASS XII

Explain the working principle of three-phase induction motor with its advantages.
Explain the construction and working principle of a room cooler. Draw a diagram of internal structure of a room cooler.
With the help of diagram, explain the working principle of capacitor start motor.
What are the advantages and disadvantages of Dynamometer wattmeter? Write the different types of Dynamometer wattmeters.
Why is starter necessary in DC motor? Explain its working in brief.
With the help of a diagram, explain the working of a universal motor.
With the help of diagram, explain basic construction and working principle of a transformer.
Write the main components of immersion heater.
Write the safety measure precautions of a transformer from the operational point of view.
What are the possible faults in electric mixer? How are they removed?
Explain the characteristics and applications of DC compound motor.
The advantage of three-phase induction motor is:
The losses in an ideal transformer will be:
Universal motor is used in .
The electrolytic capacitor used in a capacitor start motor is a short duty type and guaranteed for operations per hour.
When using electricity in a damp location must be used. (Insulation fault indicator/Ground fault circuit interrupter)
Three-phase induction motor runs at constant speed from . (No load to full load/Medium load to high load)
In digital multimeter, black lead is considered as connection of circuit. (Negative/Positive)
fitting of the heating element in the Geyser is preferred. (Horizontal/Vertical)
How will you perform earth fault test?
What do you mean by squirrel cage induction motor?
What is the full form of ONAN?
The upper bowl of electric mixer is made of which material?
Define frequency.
What is the use of induction-type energy meters?