MCQOPTIONS
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MCQOPTIONS
This section includes 538 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 401. |
In Diesel engines, the duration between the time of injection and the time of ignition is called$? |
| A. | Spill cut-off |
| B. | Delay period |
| C. | Injection period |
| D. | Ignition period |
| Answer» C. Injection period | |
| 402. |
Damper is also known as$? |
| A. | Shock absorber |
| B. | Torsion bar |
| C. | Spring |
| D. | Radius rod |
| Answer» B. Torsion bar | |
| 403. |
The compression ratio of a petrol engine is nearly$? |
| A. | 4:1 |
| B. | 8:1 |
| C. | 15:1 |
| D. | 20:1 |
| Answer» C. 15:1 | |
| 404. |
In comparison with a radial tyre, one advantage of a bias ply tyre is$? |
| A. | Longer life |
| B. | Lower rolling resistance |
| C. | Smoother ride at low speeds |
| D. | None of these |
| Answer» D. None of these | |
| 405. |
The seat belt tensioners are built in the$? |
| A. | Front seats |
| B. | Shoulder anchors |
| C. | Seat belt retractors |
| D. | Seat belt buckles |
| Answer» D. Seat belt buckles | |
| 406. |
Tachometer in a vehicle measures$? |
| A. | Speed |
| B. | Distance |
| C. | Engine r.p.m. |
| D. | Fuel consumption |
| Answer» D. Fuel consumption | |
| 407. |
In a four speed four stroke Diesel engine, the intake valve$? |
| A. | Opens at T.D.C. and closes at B.D.C. |
| B. | Opens at 20° before T.D.C. and closes at 35° after B.D.C. |
| C. | Opens at 10° after T.D.C. and closes at 20° before B.D.C. |
| D. | None of the above |
| Answer» C. Opens at 10¬¨‚àû after T.D.C. and closes at 20¬¨‚àû before B.D.C. | |
| 408. |
The function of a first compression ring (top ring) is that it$? |
| A. | Increases the combustion temperature |
| B. | Creates swirl |
| C. | Maintains a seal and prevents the fuel leakage |
| D. | Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber |
| Answer» E. | |
| 409. |
Which of the following indicates multi-grade oil?$? |
| A. | SAE 30 |
| B. | API SF |
| C. | SAE20 W50 |
| D. | API 50 |
| Answer» D. API 50 | |
| 410. |
The rigid suspension is beneficial when$? |
| A. | It is desired to reduce the unsprung mass |
| B. | It is desired to have more flexibility in design |
| C. | It is desired to improve tyre to ground contact characteristics |
| D. | Large changes in load make it necessary to have a large suspension stroke |
| Answer» E. | |
| 411. |
The function of an oil control orifice is that it$? |
| A. | Returns cylinder head lubricating oil to the oil pan at high speed |
| B. | Turns oil into fine mist for spray lubrication |
| C. | Regulates the pressure of engine oil supplied by the oil pump for the lubrication of cylinder head mechanism and other purposes |
| D. | Removes impurities from cylinder head lubricating oil |
| Answer» D. Removes impurities from cylinder head lubricating oil | |
| 412. |
In a square type engine$? |
| A. | Geometrical shape is square |
| B. | Diameter and length of piston are same |
| C. | Two cylinders are placed horizontal and two vertical |
| D. | Stroke length and cylinder bore are same |
| Answer» E. | |
| 413. |
The air resistance to a car at 20 kmph is R. The air resistance at 40 kmph will be$? |
| A. | R |
| B. | 2R |
| C. | 4R |
| D. | 4R² |
| Answer» D. 4R¬¨‚⧠| |
| 414. |
The information provided by the oxygen (O‚ÇÇ) sensor to the feedback control system is about the$? |
| A. | Air-fuel ratio |
| B. | Air temperature |
| C. | Air flow speed |
| D. | Exhaust gas volume |
| Answer» B. Air temperature | |
| 415. |
The engine oil level should be checked$? |
| A. | Immediately after the ignition switch is turned off |
| B. | While the engine is running |
| C. | A few minutes after the ignition switch is turned off |
| D. | While the engine is running at high idle speed |
| Answer» D. While the engine is running at high idle speed | |
| 416. |
The boiling point of Diesel fuel is in the range of$? |
| A. | 70°C to 100°C |
| B. | 100°C to 120°C |
| C. | 120°C to 180°C |
| D. | 180°C to 360 °C |
| Answer» E. | |
| 417. |
Cushioning springs in clutch plate reduces$? |
| A. | Vehicle speed |
| B. | Torsional vibrations |
| C. | Jerky starts |
| D. | None of these |
| Answer» D. None of these | |
| 418. |
The negative terminal post on the top of a battery is$? |
| A. | Smaller than the positive terminal post |
| B. | Larger than the positive terminal post |
| C. | Of the same size as the positive terminal post |
| D. | None of these |
| Answer» B. Larger than the positive terminal post | |
| 419. |
The number of exhaust manifolds in a V6 engine is$? |
| A. | One |
| B. | Two |
| C. | Four |
| D. | Eight |
| Answer» C. Four | |
| 420. |
A battery can be charged by$? |
| A. | Adding distilled water |
| B. | Adding sulphuric acid |
| C. | Applying voltage in the reverse direction to that of charging |
| D. | Applying a voltage in the same direction to that of charging |
| Answer» D. Applying a voltage in the same direction to that of charging | |
| 421. |
Wheel base of a vehicle is the$? |
| A. | Distance between the centres of the front and rear wheels |
| B. | Distance between the centres of the front tyres |
| C. | Distance between the centres of the rear tyres |
| D. | Extreme length of the vehicle |
| Answer» B. Distance between the centres of the front tyres | |
| 422. |
The main merit of a multi cylinder type cylinder sleeve is$? |
| A. | Smaller engine dimensions |
| B. | Better cooling efficiency |
| C. | High rigidity |
| D. | None of these |
| Answer» B. Better cooling efficiency | |
| 423. |
How many cells are used in a 12 volt car battery?$? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 424. |
The octane number of compressed natural gas (CNG) is$? |
| A. | 90 |
| B. | 100 |
| C. | 110 |
| D. | 120 |
| Answer» E. | |
| 425. |
The advantage of a tubeless tyre over tube type tyre is$? |
| A. | Slow air leakage |
| B. | Better fuel efficiency |
| C. | Less chances of running flat |
| D. | All of these |
| Answer» E. | |
| 426. |
The connecting rod is attached to the piston by the$? |
| A. | Cap bolt |
| B. | Piston pin |
| C. | Cap roller bearing |
| D. | Rod cap |
| Answer» C. Cap roller bearing | |
| 427. |
A maintenance free battery$? |
| A. | Has lead-antimony plate grid |
| B. | Has lead-calcium plate grid |
| C. | Does not contain acid |
| D. | Does not contain water |
| Answer» C. Does not contain acid | |
| 428. |
The advantage of a tubeless tyre over tube type tyre is? |
| A. | Slow air leakage |
| B. | Better fuel efficiency |
| C. | Less chances of running flat |
| D. | All of these |
| Answer» E. | |
| 429. |
The connecting rod is attached to the piston by the? |
| A. | Cap bolt |
| B. | Piston pin |
| C. | Cap roller bearing |
| D. | Rod cap |
| Answer» C. Cap roller bearing | |
| 430. |
How many cells are used in a 12 volt car battery?? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 431. |
The octane number of compressed natural gas (CNG) is? |
| A. | 90 |
| B. | 100 |
| C. | 110 |
| D. | 120 |
| Answer» E. | |
| 432. |
The main merit of a multi cylinder type cylinder sleeve is? |
| A. | Smaller engine dimensions |
| B. | Better cooling efficiency |
| C. | High rigidity |
| D. | None of these |
| Answer» B. Better cooling efficiency | |
| 433. |
Incorrect steering axis inclination (S.A.I.) causes? |
| A. | Tendency to assume toe-out orientation |
| B. | Generation of a braking effect at tight corners |
| C. | Poor recovery of the steering wheel after making a turn |
| D. | The vehicle to pull to the side of lesser inclination |
| Answer» D. The vehicle to pull to the side of lesser inclination | |
| 434. |
The acid used in automobile battery is? |
| A. | Hydrochloric acid |
| B. | Hydrofluoric acid |
| C. | Nitric acid |
| D. | Sulphuric acid |
| Answer» E. | |
| 435. |
In an engine, the temperature of the piston will be more at the? |
| A. | Crown of the piston |
| B. | Skirt of the piston |
| C. | Piston walls |
| D. | Piston rings |
| Answer» B. Skirt of the piston | |
| 436. |
It is necessary to maintain the valve clearances as they? |
| A. | Reduce the resistance to sliding that occurs between the cam and the tappet |
| B. | Allow for lengthening of the valves owing to the heat of combustion |
| C. | Increase the speed at which the valves move up and down |
| D. | Make the crankshaft turn smoothly |
| Answer» C. Increase the speed at which the valves move up and down | |
| 437. |
The Diesel engine works on? |
| A. | Otto cycle |
| B. | Carnot cycle |
| C. | Diesel cycle |
| D. | Rankine cycle |
| Answer» D. Rankine cycle | |
| 438. |
Two advantages of using helical gears rather than spur gears in a transmission system are? |
| A. | Strength and cost |
| B. | Strength and less end thrust |
| C. | Noise level and strength |
| D. | Noise level and economy |
| Answer» D. Noise level and economy | |
| 439. |
What type of bearing is used for main bearings and connecting rod bearings?? |
| A. | Ball bearings |
| B. | Plain bearings |
| C. | Needle roller bearing |
| D. | Taper roller bearing |
| Answer» C. Needle roller bearing | |
| 440. |
In radial tyres? |
| A. | One ply layer runs diagonally one way and another layer runs diagonally the other way |
| B. | All plies run parallel to one another and vertical to tyre bead |
| C. | Inner tubes are always used |
| D. | None of these |
| Answer» C. Inner tubes are always used | |
| 441. |
A maintenance free battery? |
| A. | Has lead-antimony plate grid |
| B. | Has lead-calcium plate grid |
| C. | Does not contain acid |
| D. | Does not contain water |
| Answer» C. Does not contain acid | |
| 442. |
A four cylinder engine has a capacity of 2.4 litres. The swept volume of one cylinder is? |
| A. | 400 cm³ |
| B. | 600 cm³ |
| C. | 1200 cm³ |
| D. | 2400 cm³ |
| Answer» C. 1200 cm¬¨‚â• | |
| 443. |
The composition of the electrolyte in a fully charged battery is that? |
| A. | The electrolyte is pure distilled water |
| B. | The electrolyte is pure sulphuric acid |
| C. | The electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight |
| D. | The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight |
| Answer» D. The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight | |
| 444. |
A petrol engine of a car develops 125 Nm torque at 2700 r.p.m. The car is driven in second gear having gear ratio of 1.75. The final drive ratio is 4.11. If the overall transmission efficiency is 90%, then the torque available at the driving wheels is? |
| A. | 8.091 Nm |
| B. | 80.91 Nm |
| C. | 809.1 Nm |
| D. | 8091 Nm |
| Answer» D. 8091 Nm | |
| 445. |
The parking brakes employed in vehicles are operated? |
| A. | Mechanically |
| B. | Hydraulically |
| C. | Pneumatically |
| D. | None of these |
| Answer» B. Hydraulically | |
| 446. |
The aluminium alloy is used in cylinder blocks because? |
| A. | It is lighter and has good heat dissipation characteristics |
| B. | Material cost is low |
| C. | It does not require any cylinder liners |
| D. | The piston is also made of aluminium alloy |
| Answer» B. Material cost is low | |
| 447. |
The rating of C.I. engine fuel (Diesel) is given by? |
| A. | Octane number |
| B. | Performance number |
| C. | Cetane number |
| D. | None of these |
| Answer» D. None of these | |
| 448. |
The coefficient of rolling resistance for a truck weighing 63,500 N is 0.018. The rolling resistance to the truck is? |
| A. | 1.143 N |
| B. | 11.43 N |
| C. | 114.3 N |
| D. | 1143 N |
| Answer» E. | |
| 449. |
The compression ratio in petrol engine is kept less than in Diesel engine because? |
| A. | It makes petrol engines lighter |
| B. | Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition |
| C. | Less compression ratio gives better performance |
| D. | It is just customary to have less compression ratio in petrol engines |
| Answer» C. Less compression ratio gives better performance | |
| 450. |
The power actually developed inside the engine cylinder is called as |
| A. | Indicated power |
| B. | Brake power |
| C. | Frictional power |
| D. | None of these |
| Answer» B. Brake power | |