HDFC Bank Senior Administration Officer Interview Questions, Process, and Tips

A semiconductor is a material that has electrical conductivity between that of a conductor and an insulator.

• Semiconductors are used in electronic devices such as transistors, diodes, and integrated circuits.

• They are made of materials such as silicon, germanium, and gallium arsenide.

• The conductivity of a semiconductor can be controlled by adding impurities through a process called doping.

• Semiconductors are essential com...read more

Star delta starter is a type of motor starter used for reducing the starting current of a motor.

• Star delta starter is used for motors with high starting current

• It reduces the starting current by first starting the motor in star configuration and then switching to delta configuration

• Direct online starter starts the motor directly without any reduction in starting current

• Star delta starter is more expensive than direct o...read more

The minimum permissible value of earthing in India is 1 ohm.

• The Indian Electricity Rules, 1956 specify that the earth resistance of an installation shall not exceed 1 ohm.

• This is to ensure safety of electrical equipment and personnel.

• Earthing is the process of connecting the metallic parts of electrical equipment to the earth plate or electrode.

• The earth resistance is measured using an earth tester or megger.

• Regular ma...read more

MCB is a miniature circuit breaker while MCCB is a molded case circuit breaker.

• MCB is designed for low voltage applications while MCCB is used for high voltage applications.

• MCB is rated for lower current capacities compared to MCCB.

• MCCB has adjustable trip settings while MCB does not.

• MCCB is more expensive than MCB.

• Examples of MCB brands include Legrand, Schneider Electric, and Siemens while examples of MCCB brands inc