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.
| 451. |
The condition that results in large quantities of HC emission is |
| A. | High temperature combustion |
| B. | Incomplete combustion |
| C. | Low temperature combustion |
| D. | High atmospheric temperature combustion |
| Answer» C. Low temperature combustion | |
| 452. |
Odometer is an instrument used for measurement of |
| A. | Power |
| B. | Fuel consumption |
| C. | Engine r.p.m. |
| D. | Distance |
| Answer» E. | |
| 453. |
The function of a radiator fan in the cooling system is that |
| A. | It blows air through the radiator when necessary |
| B. | It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump |
| C. | It cools the engine by blowing air onto the cylinder block |
| D. | It draws heat out of the engine compartment |
| Answer» B. It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump | |
| 454. |
The component that connects the steering rack to the knuckles is |
| A. | Tie rod |
| B. | Sector gear |
| C. | Pivot |
| D. | Spline |
| Answer» B. Sector gear | |
| 455. |
When the battery is half (50%) charged, the specific gravity of acid in a battery is usually |
| A. | 0.74 |
| B. | 1.00 |
| C. | 1.12 |
| D. | 1.19 |
| Answer» E. | |
| 456. |
The petrol engines are also known as |
| A. | Spark ignition (S.I.) engines |
| B. | Compression ignition (C.I.) engines |
| C. | Steam engines |
| D. | None of these |
| Answer» B. Compression ignition (C.I.) engines | |
| 457. |
The connecting rod lower end is connected to the relevant ________ of crankshaft. |
| A. | Big end |
| B. | Crank arm |
| C. | Journal |
| D. | Small end |
| Answer» D. Small end | |
| 458. |
The difference between DOT 3 and DOT 4 brake fluids is |
| A. | DOT 4 fluids have a higher boiling point than DOT 3 fluid |
| B. | DOT 4 fluids have a lower boiling point than DOT 3 fluid |
| C. | DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life |
| D. | DOT 4 fluid is more resistant to freezing than DOT 3 fluid |
| Answer» B. DOT 4 fluids have a lower boiling point than DOT 3 fluid | |
| 459. |
The correct flow of power through the drive train is |
| A. | Engine drive shafts, clutch, main shaft, counter shaft, final driven gear, wheels |
| B. | Engine clutch, main shaft, counter shaft, final driven gear, drive shafts, wheels |
| C. | Engine clutch, counter shaft, main shaft, final driven gear, drive shafts, wheels |
| D. | Engine main shaft, counter shaft, clutch, final driven gear, drive shafts, wheels |
| Answer» C. Engine clutch, counter shaft, main shaft, final driven gear, drive shafts, wheels | |
| 460. |
The braking control type traction control system (TCS) generally operates in the speed range of |
| A. | Less than 20 kmph |
| B. | Less than 40 kmph |
| C. | Less than 60 kmph |
| D. | More than 60 kmph |
| Answer» C. Less than 60 kmph | |
| 461. |
The minimum parking brake force is generally ___________ of gross vehicle mass (GVM). |
| A. | 5% |
| B. | 10% |
| C. | 15% |
| D. | 20% |
| Answer» E. | |
| 462. |
The mechanical efficiency (ηm) of an I.C. engine is equal to (where I.P. = Indicated power, B.P. = Brake power and F.P. = Frictional power)$ |
| A. | I.P/B.P. |
| B. | B.P/I.P. |
| C. | B.P/F.P. |
| D. | F.P/B.P. |
| Answer» C. B.P/F.P. | |
| 463. |
The most accurate ignition system of a spark ignition engine is |
| A. | Magneto system |
| B. | Battery system |
| C. | Electronic control unit system |
| D. | Magneto and electronic system |
| Answer» D. Magneto and electronic system | |
| 464. |
The characteristic that is enhanced by the honing of cylinder sleeves inner surface is |
| A. | Cooling efficiency |
| B. | Resistance to wear |
| C. | Lubrication performance |
| D. | None of these |
| Answer» D. None of these | |
| 465. |
The device for smoothening out the power impulses from the engine is called |
| A. | Clutch |
| B. | Differential |
| C. | Flywheel |
| D. | Torque converter |
| Answer» D. Torque converter | |
| 466. |
The crankshaft of a typical inline four cylinder engine has ________ balance weights. |
| A. | 12 |
| B. | 4 |
| C. | 16 |
| D. | 8 |
| Answer» E. | |
| 467. |
The drive-shafts are connected to the differential and wheel hubs through universal joints because the universal joints |
| A. | Absorb the vibrations transferred from the surface of the road |
| B. | Compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions. |
| C. | Absorb any difference in speed between the left and right wheels when the vehicle is turning |
| D. | None of the above |
| Answer» C. Absorb any difference in speed between the left and right wheels when the vehicle is turning | |
| 468. |
The basic function of the suspension is to |
| A. | Absorbs vibration and impact forces from the road surface |
| B. | Ensure that the steering wheel can deliver a suitable amount of steering force |
| C. | Ensure that wheel alignment is not disturbed during driving |
| D. | Automatically correct the effects of over steering |
| Answer» B. Ensure that the steering wheel can deliver a suitable amount of steering force | |
| 469. |
The two kinds of piston rings are |
| A. | Compression and oil control rings |
| B. | Compression and sliding seal rings |
| C. | Oil scrapper and oil control rings |
| D. | Pressure and sealing rings |
| Answer» B. Compression and sliding seal rings | |
| 470. |
Which of the following oil is more viscous? |
| A. | SAE 30 |
| B. | SAE 40 |
| C. | SAE 70 |
| D. | SAE 80 |
| Answer» E. | |
| 471. |
In a single dry plate clutch, torsional vibrations are absorbed by |
| A. | Coil springs known as torsional springs |
| B. | Cushion springs |
| C. | Central hub |
| D. | Clutch pedal |
| Answer» B. Cushion springs | |
| 472. |
During suction stroke, the inside pressure of cylinder is |
| A. | More than the atmospheric pressure |
| B. | Less than the atmospheric pressure |
| C. | Equal to the atmospheric pressure |
| D. | None of these |
| Answer» C. Equal to the atmospheric pressure | |
| 473. |
An engine has a clearance volume of 100 cm³ and a swept volume of 800 cm³. The compression ratio is$ |
| A. | 7 : 1 |
| B. | 8 : 1 |
| C. | 9 : 1 |
| D. | 10 : 1 |
| Answer» D. 10 : 1 | |
| 474. |
The basic purpose of a four wheel drive (4WD) system is that it |
| A. | Delivers improved cornering on dry road surfaces |
| B. | Eliminates the need of snow tyres, tyre chains, etc. |
| C. | Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces |
| D. | Ensures that effective braking can be performed, even on slippery surfaces |
| Answer» D. Ensures that effective braking can be performed, even on slippery surfaces | |
| 475. |
The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to |
| A. | Enable the pump's fault diagnosis function to operate |
| B. | Warm up and lubricate the pump |
| C. | Supplies a large amount of fuel and thereby creates a choke effect |
| D. | Pressurise the fuel system before the engine is started |
| Answer» E. | |
| 476. |
The basic purpose of tyres is to |
| A. | Grip the road and provide good traction |
| B. | Substitute for springs |
| C. | Act as brake |
| D. | None of these |
| Answer» B. Substitute for springs | |
| 477. |
The compression ratio for Diesel engines usually lies in the range of |
| A. | 6-10 |
| B. | 10-15 |
| C. | 15-25 |
| D. | 25-40 |
| Answer» D. 25-40 | |
| 478. |
A three way catalytic converter |
| A. | Re-circulates exhaust gases |
| B. | Burns fuel vapour gases |
| C. | Reduces N‚ÇÇ, H‚ÇÇO, and CO‚ÇÇ emission levels |
| D. | Removes CO, HC, and NO‚ÇÇ from the exhaust gases passing through it |
| Answer» E. | |
| 479. |
Two speed reverse gear arrangements is generally provided in case of |
| A. | Passenger cars |
| B. | Matadors |
| C. | Tractors |
| D. | Trucks |
| Answer» D. Trucks | |
| 480. |
A traction control system (TCS) in automobiles controls the |
| A. | Vibrations on the steering wheel |
| B. | Engine power during acceleration |
| C. | Torque that is transmitted by the tyres to the road surface |
| D. | Stopping distance in case of emergency |
| Answer» D. Stopping distance in case of emergency | |
| 481. |
In a four stroke engine for each crankshaft revolution, the camshaft revolves |
| A. | One half turn |
| B. | One turn |
| C. | Two turns |
| D. | Four turns |
| Answer» B. One turn | |
| 482. |
The basic characteristics of a brake fluid is |
| A. | A high boiling point |
| B. | Low viscosity |
| C. | Compatibility with rubber and metal parts |
| D. | All of these |
| Answer» E. | |
| 483. |
Which of the following parameter can be adjusted by modifying the tie rod attachment length? |
| A. | Camber |
| B. | Caster |
| C. | Toe |
| D. | Steering gear ratio |
| Answer» D. Steering gear ratio | |
| 484. |
If the valve clearances are excessively large, the problem that can arise is |
| A. | Overheating of the engine |
| B. | Incomplete valve closure |
| C. | Fouling of spark plug by gasoline |
| D. | None of these |
| Answer» C. Fouling of spark plug by gasoline | |
| 485. |
An imbalance wheel during vehicle operation |
| A. | Makes large noise when its heavy point hits the road surface |
| B. | Deflects in the vehicle's longitudinal direction |
| C. | Bounces vertically or deflects from side to side (as seen from front or rear) |
| D. | Creates a standing wave |
| Answer» D. Creates a standing wave | |
| 486. |
In vehicles with tilt steering, the steering column is pivoted in |
| A. | Upper bracket |
| B. | Lower bracket |
| C. | Tilt bracket |
| D. | Steering yoke joint |
| Answer» C. Tilt bracket | |
| 487. |
The materials used for cylinder block are |
| A. | Cast iron and steel |
| B. | Cast iron and aluminium alloy |
| C. | Steel and aluminium alloy |
| D. | Brass and steel |
| Answer» C. Steel and aluminium alloy | |
| 488. |
The timing belt is attached to the camshaft pulley and |
| A. | Timing belt drive pulley |
| B. | Distributor |
| C. | Radiator fan pulley |
| D. | Alternator pulley |
| Answer» B. Distributor | |
| 489. |
The effect of vapour locking on the brake performance is that the |
| A. | Brakes function more effectively |
| B. | Brakes fail completely |
| C. | Brake operation is delayed after depression of the brake pedal |
| D. | Vapour locking has no effect on brake performance |
| Answer» C. Brake operation is delayed after depression of the brake pedal | |
| 490. |
The purpose of a thermostat in an engine cooling system is to |
| A. | Prevent the coolant from boiling |
| B. | Allow the engine to warm up quickly |
| C. | Indicate the coolant temperature |
| D. | Pressurise the system to raise the boiling point |
| Answer» C. Indicate the coolant temperature | |
| 491. |
The main purpose of an engine's air cleaner is that it |
| A. | Controls the engine's air intake volume |
| B. | Reduces the engine's air intake noise |
| C. | Prevents rain water from entering the engine |
| D. | Prevents dust and other foreign matter from entering the engine |
| Answer» E. | |
| 492. |
The petrol engine works on |
| A. | Otto cycle |
| B. | Carnot cycle |
| C. | Diesel cycle |
| D. | Rankine cycle |
| Answer» B. Carnot cycle | |
| 493. |
The purpose of turning radius gauges is to measure the |
| A. | Contact areas of the tyres |
| B. | Free plays of the steering wheel |
| C. | Turning radius of the left and right wheels |
| D. | Difference in the toe angles of the left and right wheels |
| Answer» D. Difference in the toe angles of the left and right wheels | |
| 494. |
When the front wheels of a vehicle are locked during braking, then |
| A. | Stopping distance becomes extremely long |
| B. | Front tyres skid across the road surface, and the vehicle spins around |
| C. | Rear tyres skid across the road surface, and the vehicle spins around |
| D. | Driver loses control over the steering, and the vehicle continues moving in its current direction |
| Answer» E. | |
| 495. |
In bias ply tyres |
| A. | All plies run parallel to one another |
| B. | Belts of steel mesh are used in the tyres |
| C. | One ply layer runs diagonally one way and another layer runs diagonally the other way |
| D. | All of the above |
| Answer» D. All of the above | |
| 496. |
If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on |
| A. | Too lean mixture |
| B. | Stoichiometric mixture |
| C. | Most economical mixture |
| D. | Too rich mixture |
| Answer» E. | |
| 497. |
The specific gravity of Diesel is about |
| A. | 0.65 |
| B. | 0.75 |
| C. | 0.85 |
| D. | 0.95 |
| Answer» D. 0.95 | |
| 498. |
The aspect ratio (expressed in percentage) of the tyre is defined as the ratio of |
| A. | Section width to section height |
| B. | Section height to section width |
| C. | Wheel diameter to section height |
| D. | Wheel diameter to section width |
| Answer» C. Wheel diameter to section height | |
| 499. |
When the brake pedal free play is less than the specified value, then the |
| A. | Brake drags |
| B. | Brake fades |
| C. | Vapour locking occurs in the brake lines |
| D. | Antilock braking system malfunctions |
| Answer» B. Brake fades | |
| 500. |
The valve tappet clearance is measured by |
| A. | Screw pitch gauge |
| B. | Engineering scale |
| C. | Feeler gauge |
| D. | Vernier caliper |
| Answer» D. Vernier caliper | |