List of top Questions asked in CBSE CLASS XII- 2026

Which transformer is known as a single winding transformer?
Speed of motor used in electric mixer has ________ RPM.
The efficiency of single-phase motor as compared to three-phase motor is:
Eddy current in dynamometer type wattmeter can be minimised by using ________ within the region of magnetic field. (Metallic parts Non-metallic parts)
The voltage transformer is also known as ________. (Air core transformer Potential transformer)
The speed of motor or blower of room cooler is controlled by ________. (Selector switch Toggle switch)
Torque and armature current characteristics are known as ________ characteristics. (Electrical Mechanical)
Series testing leads are connected to the terminals of plug top of the water heater. The lamp is not glowing. This indicates ________. (Short circuit Open circuit)
Universal motor works only with DC supply.
In DC motor, flux is directly proportional to armature current.
The electromagnet is the main component of driving system of energy meter.
Capacitor is always connected in series with starting winding.
Three-phase induction motor works on the principle of ________. (Self-induction Mutual induction)
Squirrel cage induction motor is cheaper than slip ring motor.
Switch on power supply while working with the transformer.
What do you mean by one cycle of a wave?
How will you perform open circuit test?
First aid for an electric shock victim is:
What is the recommended distance for connecting capacitors from soft starters?
Define Lenz's law.
How is the starting torque of an induction motor improved?
What is the other name for pressure type water heater?
What do you mean by Probes?
Natural air cooling is used in transformers with ratings up to
DC shunt motor is used in