Coal India Design Engineer Interview Questions and Answers

Differential is a mechanical device that allows the wheels of a vehicle to rotate at different speeds.

• Differential is commonly found in vehicles with multiple wheels, such as cars and trucks.

• It is located in the center of the axle and connects the drive shaft to the wheels.

• The main purpose of a differential is to allow the wheels to rotate at different speeds while still receiving power from the engine.

• This is importan...read more

EGR system stands for Exhaust Gas Recirculation system. It is used in internal combustion engines to reduce nitrogen oxide emissions.

• EGR system recirculates a portion of exhaust gases back into the engine's intake manifold.

• This reduces the combustion temperature and lowers the production of nitrogen oxides.

• The recirculated exhaust gases also help in reducing engine knocking and improving fuel efficiency.

• EGR systems can...read more

The I-shift automatic gearbox uses helical gears and spur gears.

• I-shift automatic gearbox uses helical gears for the main transmission and spur gears for the auxiliary section

• Helical gears provide smoother and quieter operation compared to spur gears

• Spur gears are used for the auxiliary section as they are more efficient for high torque applications