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Mechanical Engineering Interview Questions: Unlock Knowledge through Online Education

#### 31. What is torque?

Torque is the force that causes rotation. It is a measure of how much force is acting on an object making it rotate.

#### 32. What is the difference between torque and power (in vehicle)?

While power determines the speed of a vehicle, torque determines the time in which that speed can be reached. The greater the torque figure, the faster the acceleration. The more torque in engine, the faster you accelerate. Power is the rate at which work is done, so it is basically the potential of the engine.

#### 33. How many types of suspensions are used in automobiles?

Leaf spring, Coil spring, Torsion beam, Wishbone, Air Suspension.

#### 34. What is meant by gear ratio?

A gear ratio is a direct measure of ratio of the rotational speeds of two or more interlocking gears.

#### 35. How will you differentiate between two stroke engine and four stroke engine?

In case of two stroke engine, rotation of crank shaft will be power stroke for every two rotations. During compression stroke, fuel will flow towards the crank case(suction) and during power stroke, exhaust will emit the burnt fuel through the transfer ports.

While in case of four stroke engine, rotation of crank shaft will be power stroke for every four rotation. Moreover, suction compression power and exhaust strokes are separate as there will be inlet and exhaust valves.

#### 36. What do you understand by CC of engine?

The meaning of CC is cubic centimetres. It represents the total volume of the engine cylinder. This reflects that the engine with more CC can generate more powers than the other engines. CC can also be related as inversely proportional to the fuel consumption.

#### 37. What is back compressor in engine?

Back compressor means the compression capability of the engine. An diesel engine can compress at the ratio of 14:1 to high as 25:1. Thus the higher compression leads to better efficiency of the engine. Thick black smoke emitted when the engine’s compression is reduced which leads to the deformed ead-gasket lead into crankcase.

#### 38. How air conditioners work in cars?

Air conditioners are based on the principles of evaporation and condensation and then compression and expansion. The hot air of the car is removed by the process of evaporation and then the condensation of the evaporated air takes places which is then further compressed by the compressors and then finally expanded to us in the form of cold breeze. Somehow, Air conditioning reduces the average of the car, as the energy is required to remove the hot air and then compression and expansion.

#### 39. Explain the significance of governor in automobiles?

Governor is an important component of automobile engine. It is used to regulate the main speed of engine during the variations in loads. With the variations in the load, fuel supply has to be maintained. This task is performed by the governor. In the case of high load on the engine, speed decrease, hence fuel supply has to be increased and similarly when load decreases then the fuel supply has to be decrease.

#### 40. what do you mean by Independent suspension?

Independent suspension refers to the mounting of the wheel on a separate axle, so that road shocks affect only the particular wheel.