McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 1. |
Starting motor current may be around |
| A. | 0.1 A |
| B. | 25 A |
| C. | 1. A |
| D. | 0.5 A |
| E. | 35 A |
| Answer» B. 25 A | |
| 2. |
The purpose of the dynamo in an automobile is to |
| A. | Act as a reservoir of electrical energy |
| B. | Continually recharge the battery |
| C. | Convert mechanical energy into electrical energy |
| D. | Partly convert engine power into electric power |
| E. | Supply electric power |
| Answer» B. Continually recharge the battery | |
| 3. |
In a vehicle if there is no king pin offset |
| A. | Starting steering effort will be high |
| B. | Starting steering effort will be zero |
| C. | Wobbling of wheels will increase |
| D. | bracking effort will be high |
| E. | None of the above |
| Answer» A. Starting steering effort will be high | |
| 4. |
In a four stroke engine, for the combustion of one litre of fuel, the volume of air required would be approximately |
| A. | 1 cu-m |
| B. | 5 - 7 cu-m |
| C. | 15 - 16 cu-m |
| D. | 2 cu-m |
| E. | 9 - 10 cu-m |
| Answer» E. 9 - 10 cu-m | |
| 5. |
The number of revolutions per km for a free rolling tyre are less than that calculated from its static radius. This difference in number of revolutions is due to |
| A. | forces in the contact area that cause slight forward of the tread |
| B. | hysteresis of the tyre materials which make the dynamic loaded radius somewhat larger than the static radius |
| C. | either of (A) and (B) above |
| D. | none of the above |
| E. | None of the above |
| Answer» C. either of (A) and (B) above | |
| 6. |
The reaction time of an average driver from recognizing an obstacle is taken as |
| A. | 0.5 to 1.7 seconds |
| B. | 4.5 to 7.0 seconds |
| C. | 3.5 to 4.5 seconds |
| D. | 7 to 10 seconds |
| E. | 2 to 3.5 seconds |
| Answer» A. 0.5 to 1.7 seconds | |
| 7. |
The fuel is injected into the cylinder in Diesel engine when the piston is |
| A. | Pump the fuel to the injector |
| B. | Approaching T.D.C. during compression stroke |
| C. | Just after T.D.C. during exhaust compression stroke |
| D. | Exactly at T.D.C. after compression stroke |
| E. | Approaching T.D.C. during exhaust stroke |
| Answer» B. Approaching T.D.C. during compression stroke | |
| 8. |
Dilution of lubricating oil is caused by |
| A. | Solid contaminants like dust, etc. |
| B. | Solid combustion residues |
| C. | Worn off particles |
| D. | Water |
| E. | Fuels |
| Answer» E. Fuels | |
| 9. |
The function of oil scraper rings is to |
| A. | Lubricate cylinder walls |
| B. | Retain compression |
| C. | Maintain vacuum |
| D. | Reduce vacuum |
| E. | Reduce piston wear |
| Answer» A. Lubricate cylinder walls | |
| 10. |
Speedometer drive is usually taken from |
| A. | Gear box |
| B. | Dynamo |
| C. | Fan belt |
| D. | Front wheel |
| E. | Flywheel |
| Answer» D. Front wheel | |
| 11. |
The gear ratio in the differential unit of a passenger car is of the order of |
| A. | 3 ; 1 |
| B. | 6 ; 1 |
| C. | 2 ; 1 |
| D. | 8 ; 1 |
| E. | 10 ; 1 |
| Answer» A. 3 ; 1 | |
| 12. |
Exhaust gas leakage into the cooling system is most likely to be due to a defective |
| A. | Cylinder head gasket |
| B. | Manifold gasket |
| C. | Water pump |
| D. | Radiator |
| E. | Any of the above |
| Answer» A. Cylinder head gasket | |
| 13. |
The frame provided for supporting the units of chasis and the body, in case of Tata vehicles is |
| A. | Cross member - type frame |
| B. | Centre beam frame |
| C. | Y-shaped tube frame |
| D. | Self-supporting structure |
| E. | Any of the above |
| Answer» A. Cross member - type frame | |
| 14. |
Which one of the following is not a part of the hydraulic braking system? |
| A. | Wheel cylinder |
| B. | Steering mechanism |
| C. | Brade shope |
| D. | Master cylinder |
| E. | Brake pedal |
| Answer» B. Steering mechanism | |
| 15. |
The process of super charging is meant for |
| A. | raising exhaust pressure |
| B. | increasing density of intake air |
| C. | providing air for cooling |
| D. | none of the above |
| E. | An instrument for smoke analysis |
| Answer» B. increasing density of intake air | |
| 16. |
Diesel fuel as compared to petrol is |
| A. | More difficult to ignite |
| B. | Less difficult to ignite |
| C. | Equally difficult to ignite |
| D. | None of the above |
| E. | Compression ratio |
| Answer» A. More difficult to ignite | |
| 17. |
A ring gear is provided around the engine fly-wheel |
| A. | For getting uniform speed |
| B. | To start the engine using self-starter |
| C. | For reducing noise |
| D. | To get variable engine speeds |
| E. | To operate the valves |
| Answer» B. To start the engine using self-starter | |
| 18. |
The part of the vehicle which holds the passengers and the cargo to be transported, is known as |
| A. | Senan |
| B. | Chassis |
| C. | Hull |
| D. | Cabin |
| E. | Aft |
| Answer» C. Hull | |
| 19. |
Wax is applied on car body because |
| A. | It is water repellent |
| B. | It seals off the pores |
| C. | The surface shines |
| D. | Any of the above |
| E. | None of the above |
| Answer» D. Any of the above | |
| 20. |
Synthetic rubber is made of |
| A. | Coal |
| B. | Butadiene |
| C. | Mineral oil |
| D. | Crude oil |
| E. | Starch |
| Answer» B. Butadiene | |
| 21. |
Fuel pump for diesel engine is |
| A. | electrically operated |
| B. | mechanically operated |
| C. | pneumatically operated |
| D. | electro-magnetically operated |
| E. | None of the above |
| Answer» B. mechanically operated | |
| 22. |
The process of supplying the intake air to the engine cylinder at a pressure greater than the pressure of the surrounding atmosphere is known as |
| A. | supercharging |
| B. | auto-ignition |
| C. | scavenging |
| D. | none of the above |
| E. | None of the above |
| Answer» A. supercharging | |
| 23. |
Highest useful compression ratio is an indicator of |
| A. | knocking of a fuel at a particular pressure |
| B. | knocking of a fuel at a particular temperature |
| C. | knocking of a fuel in a particular engine |
| D. | knocking of a fuel under specified conditions in a standard engine |
| E. | None of the above |
| Answer» D. knocking of a fuel under specified conditions in a standard engine | |
| 24. |
Which one of the following is antifriction bearing? |
| A. | Ball bearing |
| B. | Roller bearing |
| C. | Taper roller bearing |
| D. | Needle bearing |
| E. | All of the above |
| Answer» A. Ball bearing | |
| 25. |
The ignition of the charge in spark ignition engine before spark occurs in spark plug, is known as |
| A. | auto-ignition |
| B. | pre-ignition |
| C. | detonation |
| D. | none of the above |
| E. | None of the above |
| Answer» B. pre-ignition | |
| 26. |
Which of the following lamp in a car will have the least wattage |
| A. | Flasher bulb |
| B. | Head light bulb |
| C. | Stop light bulb |
| D. | Ignition warning light |
| E. | Parking light bulb |
| Answer» D. Ignition warning light | |
| 27. |
The boiling point of Diesel fuel may be expected to be in the range |
| A. | 150 °C to 200 °C |
| B. | 70 °C to 100 °C |
| C. | 125 °C to 135 °C |
| D. | 220 °C to 375 °C |
| E. | 100 °C to 112 °C |
| Answer» D. 220 °C to 375 °C | |
| 28. |
Odometer is |
| A. | An instrument which indicates the condition of the battery |
| B. | An instrument for distance measurement |
| C. | An instrument for BHP measurement |
| D. | An instrument for smoke analysis |
| E. | An instrument used for measurement of fuel consumption |
| Answer» B. An instrument for distance measurement | |
| 29. |
For lubrication of which part of an automobile only grease is used |
| A. | Transmission |
| B. | Steering system |
| C. | Axle drive |
| D. | Tie rod |
| E. | All of the above |
| Answer» D. Tie rod | |
| 30. |
In case of four cylinder in line engine, the number of firing stroke (s) in one revolution of crank is |
| A. | 3 |
| B. | 4 |
| C. | 2 |
| D. | Depends on the design of engine. |
| E. | 1 |
| Answer» C. 2 | |
| 31. |
Diesel engines are also known as |
| A. | S.I. engines |
| B. | C.I. engines |
| C. | Steam engines |
| D. | none of the above |
| E. | None of the above |
| Answer» B. C.I. engines | |
| 32. |
High sulphur content of petrol affects the engine performance by |
| A. | causing corrosion of muffler and exhaust pipe |
| B. | had odours |
| C. | poor explosion characteristics |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 33. |
Which part is not common between the petrol and diesel engines |
| A. | Battery |
| B. | Dynamo |
| C. | Air cleaner |
| D. | Fuel injector |
| E. | Exhaust silencer |
| Answer» D. Fuel injector | |
| 34. |
The problem of exhaust emissions can be handled by |
| A. | engine design modification |
| B. | treatment of exhaust gases |
| C. | fuel modification |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 35. |
The heating value of petrol is |
| A. | 7650 kcal/kg |
| B. | 10,000-10400 kcal/kg |
| C. | 15000-16000 kcal/kg |
| D. | 8000-8500 kcal/kg |
| E. | 12750-13850 kcal/kg |
| Answer» B. 10,000-10400 kcal/kg | |
| 36. |
The king pin inclination is usually |
| A. | Less than |
| B. | Between 2? and 5? |
| C. | More than 7? |
| D. | More than 7? |
| E. | Between 1? to 2? |
| Answer» B. Between 2? and 5? | |
| 37. |
Which of the following can be used for starting a 1000 H.P. diesel engine? |
| A. | Battery |
| B. | Shunt motor |
| C. | Small petrol engine |
| D. | Compressed air |
| E. | Any of the above |
| Answer» D. Compressed air | |
| 38. |
In a scooter engine the cylinder is lubricated by |
| A. | Cylinder does not require lubrication |
| B. | Lubrication plug |
| C. | Pressure lubrication |
| D. | Splash lubrication |
| E. | Mixing lubricating oil in the fuel |
| Answer» E. Mixing lubricating oil in the fuel | |
| 39. |
Which one of the following is independent of fuel constituents, combustion chamber design, temperature and pressure of compressed charge |
| A. | Pinking |
| B. | Pre-ignition |
| C. | Knocking |
| D. | none of the above |
| E. | None of the above |
| Answer» B. Pre-ignition | |
| 40. |
Engine pistons are generally made of aluminium alloy because |
| A. | It has less wear |
| B. | It is stronger |
| C. | It absorbs shocks |
| D. | It does not react with fuel as well as lubricating oil |
| E. | It is lighter |
| Answer» E. It is lighter | |
| 41. |
Springs are made of |
| A. | Carbon steel |
| B. | Stainless steel |
| C. | High speed steel |
| D. | Mild steel |
| E. | Spring steel |
| Answer» E. Spring steel | |
| 42. |
The breaking up of a liquid into fine droplets by spraying is called |
| A. | Injection |
| B. | Vaporization |
| C. | Atomisation |
| D. | Ionisation |
| E. | Carburetion |
| Answer» C. Atomisation | |
| 43. |
Which fuel has maximum resistance to detonation |
| A. | n-heptane |
| B. | Toluene |
| C. | Isoctave |
| D. | Benzene |
| E. | Alcohol |
| Answer» C. Isoctave | |
| 44. |
A square type engine |
| A. | Has operating speed as 64, 81, 100, 121, 144, 169, 196 rpm or the like |
| B. | Has cylinder bore equal to stroke length |
| C. | Has four cylinders with phase shift of 90? between any two consecutive cylinders |
| D. | Has two cylinders horizontal and two cylinders vertical |
| E. | Has geometrical shape as square |
| Answer» B. Has cylinder bore equal to stroke length | |
| 45. |
For balancing single cylinder engine a counter weight is added to |
| A. | Crankshaft |
| B. | Piston rings |
| C. | Piston |
| D. | Gudgeon pin |
| E. | Connecting rod |
| Answer» A. Crankshaft | |
| 46. |
In an engine shows lack of power on running the probable cause could be |
| A. | Poor compression |
| B. | Faulty ignition |
| C. | Overheating |
| D. | Over cooling |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 47. |
If the end mixture of S.I. engine is having low temperature and long igition delay, then knocking will |
| A. | accelerate |
| B. | decrease |
| C. | remain constant |
| D. | none of the above |
| E. | None of the above |
| Answer» B. decrease | |
| 48. |
The maximum pressure generated by the fuel injection pump does not reach the nozzle end immediately. The lag is due to |
| A. | friction in the oil column |
| B. | pressure wave in the oil column |
| C. | turbulence in the cylinder |
| D. | none of the above |
| E. | None of the above |
| Answer» B. pressure wave in the oil column | |
| 49. |
Which company is not engaged in the manufacture of tyres in India |
| A. | Larsen & Toubro |
| B. | Appollo |
| C. | Modi |
| D. | Good year |
| E. | J.K. |
| Answer» B. Appollo | |
| 50. |
If the cut-off is decreased, the efficiency of Diesel cycle |
| A. | is equal to Otto cycle |
| B. | is more than Otto cycle |
| C. | is less than Otto cycle |
| D. | approaches to Otto cycle |
| E. | None of the above |
| Answer» D. approaches to Otto cycle | |
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