MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 365 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
The main task of a battery in automobiles is to |
| A. | Supply electricity to the alternator |
| B. | Act as a reservoir or stabilizer of electricity |
| C. | Supply electricity to the vehicle's electrical system at all times while the engine is running |
| D. | Supply a large amount of power to turn the starter motor when the engine is being started |
| Answer» E. | |
| 302. |
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. | |
| 303. |
Highest useful compression ratio (HUCR) is the highest compression ratio at which the |
| A. | Engine can run |
| B. | Engine gives maximum output |
| C. | Engine is most efficient |
| D. | Fuel can be used in a test engine without knocking |
| Answer» E. | |
| 304. |
A laminated glass upon cracking |
| A. | Bursts into sharp edged fragments |
| B. | Bursts into granular pieces |
| C. | Sandwiched layer traps the fragments |
| D. | Breaks into the form of crystals |
| Answer» D. Breaks into the form of crystals | |
| 305. |
The self ignition temperature of Diesel as compared to petrol is |
| A. | Higher |
| B. | Lower |
| C. | Same |
| D. | Depends on fuel quality |
| Answer» C. Same | |
| 306. |
The Diesel 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» C. Steam engines | |
| 307. |
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 | |
| 308. |
A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it |
| A. | Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion |
| B. | Allows the steering wheel to be turned by a greater amount when steering |
| C. | Makes the steering more responsive |
| D. | Reduces the amount of kickback for large steering angles |
| Answer» B. Allows the steering wheel to be turned by a greater amount when steering | |
| 309. |
An under-inflated tyre will wear the tread most |
| A. | Near the centre |
| B. | Near the edges |
| C. | In the lateral direction |
| D. | In the cross direction |
| Answer» C. In the lateral direction | |
| 310. |
The purpose of a balancer shaft is to |
| A. | Balance the timing in the movement of the two groups of pistons |
| B. | Increase inertia force of the rotating crankshaft |
| C. | Reduce vibrations caused by the crankshaft rotation |
| D. | Adjusts the timing of the intake and exhaust valve openings |
| Answer» D. Adjusts the timing of the intake and exhaust valve openings | |
| 311. |
The correct way to rectify an imbalanced wheel is to |
| A. | Adjust the tyre pressure |
| B. | Rotate the tyres |
| C. | Adjust the damper spring tension |
| D. | Attach appropriate weights to the wheel at appropriate positions |
| Answer» E. | |
| 312. |
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 | |
| 313. |
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. | |
| 314. |
The octane rating of petrol commercially available is |
| A. | 85-95 |
| B. | 95-100 |
| C. | 100-110 |
| D. | 110-125 |
| Answer» B. 95-100 | |
| 315. |
Which of the following symptom is caused as a result of brake disc run out? |
| A. | Ineffectiveness of the brakes |
| B. | Judder during braking |
| C. | Localized wearing of the brake pads |
| D. | Rapid wearing of the brake pads |
| Answer» C. Localized wearing of the brake pads | |
| 316. |
The camshaft of a four stroke Diesel engine running at 1000 rpm will run at |
| A. | 500 rpm |
| B. | 1000 rpm |
| C. | 2000 rpm |
| D. | 4000 rpm |
| Answer» B. 1000 rpm | |
| 317. |
The engine oil viscosity is defined by ___________ ratings. |
| A. | Automatic transmission fluid (ATF) |
| B. | Society of automotive engineers (SAE) |
| C. | Gross vehicle weight (GVW) |
| D. | American petroleum institute (API) |
| Answer» C. Gross vehicle weight (GVW) | |
| 318. |
In order to implement gear changes in the gear unit of an automatic transmission, a ___________ is used. |
| A. | Synchronizer |
| B. | Planetary gear |
| C. | Magnetic clutch |
| D. | Hydraulic multi plate clutch |
| Answer» E. | |
| 319. |
A heat treated glass generally used in automobiles bursts into ________ upon cracking, |
| A. | Sharp edged fragments |
| B. | Small particles |
| C. | Large particles |
| D. | None of these |
| Answer» C. Large particles | |
| 320. |
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 | |
| 321. |
The positive plates of a lead acid battery has |
| A. | Lead peroxide (PbO₂) |
| B. | Spongy lead (Pb) |
| C. | Lead sulphate (PbSO₄) |
| D. | Sulphuric acid (H₂SO₄) |
| Answer» B. Spongy lead (Pb) | |
| 322. |
The negative plates of a lead acid battery has |
| A. | Lead peroxide (PbO₂) |
| B. | Spongy lead (Pb) |
| C. | Lead sulphate (PbSO₄) |
| D. | Sulphuric acid (H₂SO₄) |
| Answer» C. Lead sulphate (PbSO₄) | |
| 323. |
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 | |
| 324. |
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. | |
| 325. |
The function of anti-lock brake system (ABS) is that is |
| A. | Reduces the stopping distance |
| B. | Minimizes the brake fade |
| C. | Maintains directional control during braking by preventing the wheels from locking |
| D. | Prevents nose dives during braking and thereby postpones locking of the wheels |
| Answer» D. Prevents nose dives during braking and thereby postpones locking of the wheels | |
| 326. |
In a fuel injection system, the electronic control module (ECM) calculates the optimum fuel-injection volume for the engine condition based on the data received from the sensors, and injects this volume of fuel into the intake manifold at the optimum timing. |
| A. | Correct |
| B. | Incorrect |
| C. | - |
| D. | - |
| Answer» B. Incorrect | |
| 327. |
The coefficient of friction for the clutch facing is approximately |
| A. | 0.1 |
| B. | 0.4 |
| C. | 0.8 |
| D. | 1.2 |
| Answer» C. 0.8 | |
| 328. |
Which of the following indicates a multigrade oil ? |
| A. | SAE 30 |
| B. | API SF |
| C. | SAE 20 W-50 |
| D. | API 50 |
| Answer» D. API 50 | |
| 329. |
The valve overlap in four stroke petrol engines is approximately |
| A. | 30° |
| B. | 60° |
| C. | 90° |
| D. | 120° |
| Answer» B. 60° | |
| 330. |
The cetane number of a Diesel fuel is a measure of |
| A. | volatility |
| B. | viscosity |
| C. | ignition quality |
| D. | delay peirod |
| Answer» E. | |
| 331. |
The air gap between the central electrode and ground (or side) electrode of a spark plug is around |
| A. | 0.2 mm |
| B. | 0.5 mm |
| C. | 1 mm |
| D. | 1.5 mm |
| Answer» D. 1.5 mm | |
| 332. |
The cetane rating of Diesel fuel is in the order of |
| A. | 25 |
| B. | 45 |
| C. | 70 |
| D. | 90 |
| Answer» C. 70 | |
| 333. |
The natural gas is compressed in a CNG cylinder at a pressure of |
| A. | 200 bar |
| B. | 220 bar |
| C. | 250 bar |
| D. | 300 bar |
| Answer» B. 220 bar | |
| 334. |
The most commonly used supplementary restraint system (SRS) component is |
| A. | seat belt |
| B. | brake |
| C. | airbag |
| D. | steering |
| Answer» D. steering | |
| 335. |
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 | |
| 336. |
The aluminium alloy is used in cylinder blocks because |
| A. | it is lighter and have 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 | |
| 337. |
The operation of removing trapped air from the hydraulic braking system is known as |
| A. | trapping |
| B. | tapping |
| C. | bleeding |
| D. | cleaning |
| Answer» D. cleaning | |
| 338. |
The battery is an electrochemical device, which means battery |
| A. | makes chemicals by mechanical means |
| B. | uses chemical action to provide electricity |
| C. | has curved plates instead of flat plates |
| D. | does not use an electrolyte |
| Answer» C. has curved plates instead of flat plates | |
| 339. |
The diagram which shows the correct crank positions corresponding to the opening and closing of the valves, is known as |
| A. | indicator diagram |
| B. | axial force diagram |
| C. | valve timing diagram |
| D. | none of these |
| Answer» D. none of these | |
| 340. |
The information provided by the oxygen (O 2 ) 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 | |
| 341. |
If the air-fuel mixture ignites before the spark takes place at spark plug, the condition is called |
| A. | detonation |
| B. | ignition |
| C. | pre-ignition |
| D. | rumble |
| Answer» D. rumble | |
| 342. |
If the level of tension in the belt is too high, it can result in a loss of power or in bending of the rotating shaft or crankshaft. |
| A. | Correct |
| B. | Incorrect |
| C. | - |
| D. | - |
| Answer» B. Incorrect | |
| 343. |
The co-efficient 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. | |
| 344. |
The advantage of double-wishbone suspension design is that a large amount of freedom is available for setting geometry and precise settings can be made for driving comfort and steerability, |
| A. | Correct |
| B. | Incorrect |
| C. | - |
| D. | - |
| Answer» B. Incorrect | |
| 345. |
If the air-fuel mixture in a spark ignition engine is too rich, then air-fuel ratio is about |
| A. | 17:1 |
| B. | 15:1 |
| C. | 13:1 |
| D. | 10:1 |
| Answer» E. | |
| 346. |
The effect of having excess camber is |
| A. | excessive steering alignment torque |
| B. | hard steering |
| C. | too much traction |
| D. | uneven tyre wear |
| Answer» E. | |
| 347. |
In a ventilated disc brake, |
| A. | a duct directs air towards the caliper for cooling while the vehicle is moving |
| B. | caliper is covered with cooling fins |
| C. | disc contains many small holes for optimum cooling performance |
| D. | disc contains radial vanes between its rubbing surfaces for optimum cooling performance |
| Answer» E. | |
| 348. |
The firing order for an in-line four cylinder I.C. engine is |
| A. | 1-2-3-4 |
| B. | 1-3-4-2 |
| C. | 1-2-4-3 |
| D. | 1-3-2-4 |
| Answer» C. 1-2-4-3 | |
| 349. |
In automobiles G.V.W. refers to |
| A. | gross vehicle width |
| B. | gross vehicle weight |
| C. | gross vehicle wheel base |
| D. | gross vehicle wheel track |
| Answer» C. gross vehicle wheel base | |
| 350. |
Positive camber is used to compensate for wheels tilting inward due to the weight of the vehicle. |
| A. | Yes |
| B. | No |
| C. | - |
| D. | - |
| Answer» B. No | |