Pace IIT & Medical Electrician Interview Questions and Answers

There are three types of protection in a transformer.

• The three types of protection are overload protection, overcurrent protection, and overvoltage protection.

• Overload protection protects the transformer from excessive heat caused by too much current.

• Overcurrent protection protects the transformer from damage caused by excessive current.

• Overvoltage protection protects the transformer from damage caused by excessive vol...read more

The 4 protection devices for an oil type transformer are Buchholz relay, pressure relief valve, oil level indicator, and winding temperature indicator.

• Buchholz relay detects gas accumulation and oil level changes

• Pressure relief valve releases excess pressure to prevent explosion

• Oil level indicator monitors oil level to prevent damage to transformer

• Winding temperature indicator measures temperature to prevent overheatin

MPCB stands for Motor Protection Circuit Breaker.

• MPCB is an electrical device used to protect motors from overloading, short circuits, and phase failures.

• It is a combination of a circuit breaker and a contactor.

• MPCBs are commonly used in industrial and commercial applications.

• They are available in different sizes and ratings depending on the motor's power and voltage requirements.

An induction motor works by inducing a magnetic field in the rotor through electromagnetic induction.

• The stator creates a rotating magnetic field

• This induces a current in the rotor, creating a magnetic field

• The interaction of the two fields causes the rotor to rotate

• Induction motors are commonly used in industrial and residential applications

DC motors use direct current to produce rotational motion while induction motors use alternating current and electromagnetic induction.

• DC motors have a commutator and brushes while induction motors do not.

• DC motors have a constant speed while induction motors have a variable speed.

• DC motors are more efficient at low speeds while induction motors are more efficient at high speeds.

• DC motors are commonly used in small app...read more