Amara Raja Group Assistant Engineer Mechanical Interview Questions and Answers

I am a recent graduate with a degree in Mechanical Engineering and a passion for problem-solving and innovation.

• Graduated with a degree in Mechanical Engineering

• Passionate about problem-solving and innovation

• Completed internships at XYZ Company and ABC Company

• Led a team project on designing a new prototype for a car engine

Vapour compression refrigeration cycle is a process used in refrigeration systems to remove heat from a space and maintain a cool temperature.

• Vapour compression refrigeration cycle is based on the principle of phase change of a refrigerant.

• The cycle consists of four main components: compressor, condenser, expansion valve, and evaporator.

• The refrigerant enters the compressor as a low-pressure vapor and is compressed to ...read more

The differential is a device that allows the wheels of a vehicle to rotate at different speeds while maintaining traction.

• The differential is located in the center of the axle and is connected to the drive shaft.

• It consists of a set of gears that distribute power from the engine to the wheels.

• The main function of the differential is to allow the wheels to rotate at different speeds, especially when turning.

• When a vehic...read more

The propeller shaft is a component in an automobile that transmits power from the transmission to the differential.

• It is a long, cylindrical shaft made of steel or aluminum.

• It connects the transmission output shaft to the differential input shaft.

• It allows the power generated by the engine to be transferred to the wheels.

• It is commonly used in rear-wheel drive vehicles.

• In four-wheel drive vehicles, there are usually tw...read more

The number of joints in a propeller shaft depends on the design and type of the shaft.

• The number of joints can vary depending on the length and complexity of the propeller shaft.

• A typical propeller shaft may have one or two joints.

• Some propeller shafts may have more joints if they are designed for flexibility or to accommodate changes in length.

• The joints in a propeller shaft are usually universal joints or constant ve...read more

Universal joints are mechanical devices used to connect two shafts that are not in line with each other.

• Universal joints are also known as U-joints or Cardan joints.

• They are commonly used in automotive applications to transmit power from the engine to the wheels.

• Universal joints allow for the transmission of rotational motion at different angles and speeds.

• They consist of a cross-shaped component with needle bearings a...read more

The gears used in a differential are bevel gears and pinion gears.

• Bevel gears are used to transfer power from the drive shaft to the differential housing.

• Pinion gears are used to transfer power from the differential housing to the axle shafts.

• The bevel gears and pinion gears work together to allow the wheels to rotate at different speeds while maintaining power distribution.

• The bevel gears are typically spiral bevel ge...read more

The boiling point of a substance decreases with decreasing pressure in a vacuum.

• Boiling point is the temperature at which a substance changes from a liquid to a gas.

• In a vacuum, the pressure is significantly lower than atmospheric pressure.

• Lower pressure in a vacuum reduces the intermolecular forces holding the substance together.

• As a result, less energy is required to overcome these forces and the boiling point decrea...read more

One tonnage of refrigeration is equal to approximately 3.5169 kilowatts (KW).

• One ton of refrigeration is the amount of heat required to melt one ton (2000 pounds) of ice in 24 hours.

• It is a unit used to measure the cooling capacity of refrigeration systems.

• The conversion factor from tonnage of refrigeration to KW is approximately 3.5169.

• To convert tonnage of refrigeration to KW, multiply the tonnage by 3.5169.

There are several types of heat exchangers, including shell and tube, plate, and finned tube heat exchangers.

• Shell and tube heat exchangers consist of a shell with multiple tubes inside, allowing for efficient heat transfer.

• Plate heat exchangers use a series of plates to separate the hot and cold fluids, maximizing heat transfer surface area.

• Finned tube heat exchangers have fins attached to the tubes, increasing the he...read more

There are 2.54 centimeters in one inch.

• 1 inch is equal to 2.54 centimeters.

• The conversion factor between inches and centimeters is 2.54.

• To convert inches to centimeters, multiply the number of inches by 2.54.

• To convert centimeters to inches, divide the number of centimeters by 2.54.