Mechanical Seal Balanced – Unbalanced seal for Vessel/Reactor and Pump – Maintenancemech

 Interview Questions and Answers -

Dear Readers here we will find automobile and mechanical interview question answer, I hope it will give you benefits during your interview.

1.What is actual power delivered by the engine known as?

Ans- Answer: C

a) Shaft power

b) Horse - power

c) Brake power

d) None of the mentioned

2. If ‘T’ is torque (in Nm) and ‘N’ is speed (in rpm) then the required expression for Brake power ‘B.P’ in kW s is-

Ans- b

a) 2πNT/6000

b) 2πNT/60000

c) πNT/6000

d) πNT/60000

3. The torque available at the contact between road and driving wheel is called

Ans- c

a) Brake power

b) Friction power

c) Tractive effort

d) Engine torque

4. If ‘V’ is vehicle speed (in meters/min) and ‘R’ is radius of driving wheel (in meters) then the rpm of the driving wheel is given by

Ans- a

a) rpm = V/2πR

b) rpm = 2πV/R

c) rpm = πR/V

d) rpm = πV/R

5. Which of these is not a power loss which takes place between engine and driving wheel

Ans- d

a) Power loss due to friction of piston bearings and gears

b) Power loss from clutch to drive wheel due to friction of various parts

c) Transmission line loss

d) None of the mentioned

6. The force that opposes the motion of a vehicle is

Ans- d

a) Rolling resistance

b) Gradient resistance

c) Wind or air resistance

d) All of the mentioned

7. Rolling resistance does not depend on which of the following factors

Ans- b

a) Load on each road wheel

b) Radius of driving wheel

c) Wheel inflation pressure

d) Nature of road surface

8. For an average type of road surface what percentage of vehicle’s weight constitutes rolling resistance

Ans- b

a) 5 to 10%

b) 1 to 2%

c) 2 to 5%

d) 0 to 3%

9. Wind or air resistance depends on which of the following factors

Ans- d

a) Shape and size of vehicle body

b) Air velocity

c) Speed of vehicle

d) All of the mentioned

10. If ‘k’ is coefficient of air resistance, ‘A’ is frontal area projected by the vehicle in square meters and ‘V’ is vehicle speed (in km/h) then the expression for air resistance ‘A.R’ on the vehicle is

Ans- a

a) A.R = k*A*V^2

b) A.R = k*A*V^3

c) A.R = 2k*A*V

d) A.R = k*A*V

11. The value of coefficient of air resistance for average cars is approximately equal to

Ans- c

a) 0.32

b) 0.032

c) 0.0032

d) 1.32

12. One Horse -Power (H.P) is approximately equal to _____ Watts.

Ans- d

a) 810

b) 545

c) 634

d) 746

13. Gradient resistance for a vehicle depends on which of the following factors

Ans- a

a) Weight of the vehicle

b) Size of the vehicle

c) Width of tire

d) Speed of the vehicle

14. Power to weight ratio for high performance cars can range up-to

Ans- c

a) 150

b) 190

c) 230

d) 280

15. What is a catalyst ?

Catalyst is a chemical substance which increases the rate of chemical reaction. Examples are Platinum, Palladium and Rhodium.

 16. Why are the side of the frame upswept at two places?

 The frame is upswept at the rear and front to accommodate the movement of the axles due to springing. It also keeps the chassis height low.

17. What is the function of a bumper?

A bumper is the front-most or rear-most part, which is designed to allow the vehicle to sustain an impact without damage to the vehicle’s safety systems

18. Name few components of engine.

1. Cylinder head
2.  Crankcase
3. Cylinder
4. Piston
5.  Connecting rod
6. Crankshaft
7.  Camshaft
8. Valves
9.  Spark plug (in the case of petrol engine.

19.What is meant by self-propelled vehicle?

A self propelled vehicle is known as an “Automobile”

20. State the major types of automobiles according to the fuel used.

•  Petrol Engines (SI engines)
• Diesel Engines (CI engines)
• Gas Engines (either SI or CI mode)

21. How automobiles are classified into different types?

 Based on Make & Model

• Based on Fuel
• Based on Body Style
• Based on No. of Wheels
• Based on Drive
• Based on Transmission

22.What are the two types of piston rings?

• Compression rings
• Oil rings

23. What are the advantages of air-cooled engines?

1. Less weight-power ratio
2. Does not require radiator and water pump
3. No antifreeze agents required
4. No salt and mud deposits in the system
5. Air cooled engines are cheaper

24.What is the function of piston, connecting rod, crank shaft and cylinder head?

• Piston – The piston assembly transfers the force from the power stroke to the crankshaft
• Connecting rod – converts reciprocating motion of piston into rotary motion of crankshaft
• Cylinder head – it acts as a top cover to the cylinder block. The valves are placed in the cylinder head in an overhead valve engine.

25. What is the purpose of cooling system?

The purpose of cooling system is to cool the engine components in order to keep their temperature below certain limit and thereby avoiding excessive thermal stress in those components.

26. What is the purpose of lubricating system? State its types.

The purpose of lubrication system is to supply the lubricating oil between the moving parts of the engine in order to
1. Reduce the friction
2. Provide the cooling effect
3. carry away the deposits formed due to wear and tear.

Types: –

• Mist lubrication
• Splash lubrication
• Pressure feed lubrication
• Combined splash & pressure feed lubrication.

27.What is fluid? What is fluid mechanics?

Answer : A fluid is a substance which always

 

 responses to shear stress and doesn’t have

 

 any definite shape. It may or may not have any

 

 definite volume.