List of top Questions asked in CBSE CLASS XII

Which transformer is known as a single winding transformer?
The efficiency of single-phase motor as compared to three-phase motor is:
Star delta motor starters are used for ________ motors.
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)
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)
The speed of motor or blower of room cooler is controlled by ________. (Selector switch Toggle switch)
The electromagnet is the main component of driving system of energy meter.
Three-phase induction motor works on the principle of ________. (Self-induction Mutual induction)
Universal motor works only with DC supply.
Capacitor is always connected in series with starting winding.
In DC motor, flux is directly proportional to armature current.
Switch on power supply while working with the transformer.
Squirrel cage induction motor is cheaper than slip ring motor.
What is the recommended distance for connecting capacitors from soft starters?
How will you perform open circuit test?
What is the other name for pressure type water heater?
How is the starting torque of an induction motor improved?
What do you mean by one cycle of a wave?
First aid for an electric shock victim is:
What do you mean by Probes?
Define Lenz's law.
Megger is used to measure ________.
DC shunt motor is used in