List of top Questions asked in CBSE CLASS XII

In digital multimeter, black lead is considered as connection of circuit. (Negative/Positive)

Three-phase induction motor runs at constant speed from . (No load to full load/Medium load to high load)

Speed and torque characteristic of DC motor is known as characteristic. (Electrical/Mechanical)

Write True/False :
(i) Manual handling causes over a third of all workplace injuries.
(ii) Maintenance cost of slip ring motor is less as compared to squirrel cage motor.
(iii) Always place transformer in a dry area.
(iv) The core of electromagnet is made up of soft iron or silicon steel lamination.
(v) Three-phase induction motors are used for domestic purposes.
(vi) DC series motor is used when high starting torque is required.

fitting of the heating element in the Geyser is preferred. (Horizontal/Vertical)

What is the full form of ONAN?

What do you mean by squirrel cage induction motor?

Which type of motor is used in room coolers?

What is the use of induction-type energy meters?

What does ( Ia ) indicate in the voltage equation of a DC motor? [ V = Eb + Ia Ra ]

Name any two types of single phase induction motors.

Continuity of electrical circuit is checked by .

Define frequency.

The upper bowl of electric mixer is made of which material?

How many contactors does a star-delta motor starter require?

The shape of a rotor is:

The peak energy stored in an RLC circuit divided by the average energy dissipated in the circuit per radian at resonance is called:

One BHP is equal to:

With the help of a block diagram, explain the working principle of disc recording system.

Explain working, merits, demerits and application of moving coil microphone.