Automobile Engineering Questions & Answer

 

01. During suction stroke, the inside pressure of cylinder is

 

Ans:- less then the atmospheric pressure

 

02. The function of an oil control orifice is that it

 

Ans:- regulates the pressure of engine oil supplied by the oil pump for the lubrication of cylinder head mechanism and other purposes.

 

03. The advantage of having a tandem master cylinder arrangement in automobiles is that it

 

Ans:- enhances safety by serving two independent lines in a divided-line brake circuit

 

04. In petrol engines, during suction stroke, __________ is drawn in the cylinder

Ans:- air and fuel

 

05. The purpose of adding pigment to the paint is that it

 

Ans:- gives color and filling up effect to the paint

 

06. When the top of the wheel is tilted outward, then it is called

 

Ans:- positive camber

 

07. The commonly used antifreeze solution in automobiles is

 

Ans:- ethylene glycol

 

08. Engine misfiring is likely to result from

 

Ans:- spark plug gap too wide

 

09. The basic part of the engine, to which the other engine parts are attached or assembled in the

 

Ans:- cylinder block

 

10. Which of the following bulb in a car will have the least wattage?

 

Ans:- Ignition warning bulb

Automobile Engineering Top ten Questions and Answer

 

01. The lower cylindrical portion of the piston which improves piston cooling performance is called

 

Ans:- piston skirt

 

 

02. The most an effective method of controlling S.I. engine exhaust emission is by

 

Ans:- using catalytic converter

 

03. The power actually developed inside the engine cylinder is called as

 

Ans:- indicated power

 

04. The basic function of the suspension is to

Ans:- absorb vibration and impact forces from the road surface

 

05. Damper in an automobile is used to

 

Ans:- dissipate the energy

 

06. The combustion process in a Diesel engine is a

 

Ans:- constant pressure process

 

07. The damper fluid leakage typically occurs from

 

Ans:- clearance between inner and outer tubes of the damper

 

08. The compression ratio of a petrol engine is nearly

 

Ans:- 8:1

 

09. The rigid suspension is beneficial when

 

Ans:- large changes in load make it necessary to have a large suspension stroke

 

10. The tire rotation is generally done at

 

Ans:- 10000 km

Automobile Engineering most imp Questions & Answer

 

01. The oil the pump is driven by the

 

Ans:- crankshaft directly

 

02. The vehicle ride will be comfortable if

 

An:- unsparing mass is kept minimum

 

03. The main function of the intake manifold is that it

 

Ans:- distributes intake air equally to the cylinders

 

04. A front of the stabilizer bar is used to

 

Ans:- control suspension movement and body roll

 

05. When indicated power (I.P.) and frictional power (F.P.) are known, we can calculate

 

Ans:- brake power

 

06. The battery can be charged by

 

Ans:- applying voltage in the reverse direction to that of charging

 

07. The best fuels for compression ignition engines are

 

Ans:- naphthalene’s

 

08. Damper is also known as

 

Ans:- shock absorber

 

09. The main function of a resonator is that it

 

Ans:- reduces the intake air noise

 

10. For the same maximum pressure and temperature

 

Ans:- Diesel cycle is more efficient than the Otto cycle

IC ENGINE TOP 10 MCQ

01.For maximum specific output of a constant volume cycle (Otto cycle)

otto cycle

temperature of the working fluid at the end of compression and expansion should be equal.

02.In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of

1000°C.

03.Which cycle consists of two reversible isotherms and two reversible isobars?

Ericsson cycle.

04.In SI engines for higher thermal efficiency

compression ratio should be high.

05.The two reference fuels used for cetane rating are

cetane and a-methyl naphthalene.

06.In some carburetors, meter rod and economizer device is used for

power enrichment.

07.In the operation of four-stoke diesel engines, the term 'squish' refers to the

entry air into the combustion chamber.

08.In a diesel engine, the fuel is ignited by

heat resulting from compressing air that is supplied for combustion.

09.Pistons of diesel engines are usually cooled by

Diesel engine.

Lubricating oil.

10.Air injected in IC engines refers to injection of

Liquid fuel and air.

AUTOMOBILE ENGINEERING MCQ SECTION 39

391. What is approximate value of octane number of Natural gas

(A) Less than 100

(B) 120 to 130

(C) Around 150

(D) 85 to 105

Answer: -120 to 130

392. The air / fuel ratio, at which maximum power output is available

(A) Near stoichiometric mixture

(B) 16

(C) Less than 10

(D) Near to 12

Answer: -Near to 12

393. One Btu of Energy is equal to kJ:

(A) 1.055

(B) 4.1868

(C) 1.2

(D) 4.5

Answer: -1.055

394. The top portion of the tyre is called

(A) Tread

(B) Rayon cords

(C) Bead wire

(D) None of these

Answer: -Tread

395. Which type of pump is most suitable for high pressure and moderate capacity

pumping?

(A) Rotary positive displacement

(B) Centrifugal

(C) Reciprocating

(D) None of these

Answer: -Reciprocating

396. Hypsometer works on the principle of

(A) Boiling temperature of water varies with atmospheric pressure

(B) Independent of Boiling Temperature

(C) Atmospheric pressure varies with altitude

(D) None of the above

Answer: -Boiling temperature of water varies with atmospheric pressure

397. Which of the following is used to check change in ocular lines position due to column rotation in universal micrometer?

(A) Dial indicator

(B) Slip gauges

(C) Control shaft

(D) Universal microscope

Answer: -Control shaft

398. Which of the following is most convenient to measure the cylindrical ring gauges?

(A) Slip gauges

(B) Micrometer

(C) Measurement by using rollers

(D) Pneumatic comparators

Answer: - Pneumatic comparators

399. Which of the following is best gauge/machine to inspect the parallel screw ring gauges?

(A) Hand micrometer

(B) Plug check gauges

(C) Comparators

(D) Bench micrometer

Answer: -Comparators

400. Which of the following is generally used to calibrate slip gauges?

(A) Micrometer

(B) Collimator

(C) Interferometer

(D) Gap gauge

Answer: -Interferometer

AUTOMOBILE ENGINEERING MCQ SECTION 38

381. Which one is not the main objective of annealing

(A) soften the steel

(B) refine the grain structure

(C) relieve internal stresses

(D) improve brittleness

Answer: -improve brittleness

382. The portion of the piston below the ring section is known as

(A) Piston crown

(B) Oil ring

(C) Compression ring

(D) Piston skirt

Answer: -Piston skirt

383. Two blocks which are at different states are brought into contact with each other and allowed to reach a final state of thermal equilibrium. The final

attained is specified by the

(A) zeroth law of thermodynamics

(B) first law of thermodynamics

(C) second law of thermodynamics

(D) third law of thermodynamics

Answer: -zeroth law of thermodynamics

384. Which one of the following is the extensive property of a thermodynamic system?

(A) Volume

(B) Pressure

(C) Temperature

(D) Density

Answer: -Volume

385. Which one of the following thermodynamic processes approximates the steaming of food in a pressure cooker?

(A) Isenthalpic

(B) Isobaric

(C) Isochoric

(D) Isothermal

Answer: -Isochoric

386. Identify the correct statement for movement in lathe machine

(A) Longitudinal feed - through carriage movement

(B) Cross feed - through cross slide movement

(C) Angular feed - through top slide movement

(D) All of the above

Answer: -All of the above

387. For the same compression ratio or the same heat rejection, which power cycle

is more efficient?

(A) Diesel cycle

(B) Dual cycle

(C) Otto cycle

(D) None of the above

Answer: -Otto cycle

388. The advantages of cold working of metals, except

(A) Improve surface finish

(B) Closer dimensional

(C) Scale free and bright surface

(D) Refine the grain structure

Answer: -Refine the grain structure

390. The act of restoring the cutting face of a grinding wheel by removing the

abrasive materials from the cutting face and sides of the wheel is known as:

(A) Wheel truing

(B) Wheel dressing

(C) Wheel metal crushers

(D) None of these

Answer: -Wheel truing

AUTOMOBILE ENGINEERING MCQ SECTION 37

371.At resonance, the amplitude of vibration is

(A) Very large

(B) Small

(C) Zero

(D) Depends upon frequency

Answer: -Very large

372. An ideal fluid

(A) Has no viscosity

(B)  Satisfies the relationship (pv = RT)

(C) Obey the Newton's law of viscosity

(D) Is both incompressible and non viscous

Answer: -Is both incompressible and non viscous

373. Surface tension is a phenomenon due to

(A) Viscous force

(B) Cohesion between the liquid molecules

(C) Adhesion between the liquid and solid molecules

(D) Adhesion and cohesion both

Answer: -Cohesion between the liquid molecules

374. One torr pressure is equivalent to

(A) 1 mm of Hg

(B) 1 atmosphere

(C) 1 Pascal

(D) 10 m of water

Answer: -1 mm of Hg

375. Euler’s dimensionless number relates

(A) Inertia and gravity force

(B) Viscous and inertia force

(C) Pressure and inertia force

(D) Buoyant and viscous force.

Answer: -Pressure and inertia force

376. According to Indian Standards., total number of tolerance grades are

(A) 8

(B) 12

(iii) 18

(D) 20

Answer: -18

377. In designing a sleeve and cotter joint, the outside diameter of the sleeve is taken as, where d is diameter of the rod

(A) 1.5 d

(B) 2.5 d

(C) 3 d

(D) 4 d

Answer: -2.5 d

378. What is the value of Poisson’s ratio for steel

(A) 0.25 to 0.33

(B) 0.5 to 0.66

(C) 0.75 to 0.85

(D) 0.10 to 0.16

Answer: -0.25 to 0.33

379. What is the effect of adding Phosphorus in cast iron

(A) Improve hardness

(B) Improve brittleness

(C) Reduce hardness

(D) Improve fluidity

Answer: -Improve fluidity

380. The carbon % carry by the dead mild steel are in the order of

(A) 0.45 to 0.8

(B) 0.85 to 1.0

(C) Up to 0.15

(D) None of these

Answer: -Up to 0.15

AUTOMOBILE ENGINEERING MCQ SECTION 36

361. The part that rotates to circulate coolant between the radiator and water

jackets is the

(A) Bypass valve

(B) Propeller

(C) Expeller

(D) Impeller

Answer: -Impeller

362. The inertia of the rotating parts of the clutch should be

(A) Minimum

(B) Maximum

(C) Zero

(D) None of above

Answer: -Minimum

363. Cushion spring in automotive clutch plate are required to reduce

(A) Vehicle speed

(B) Torsional vibrations

(C) Jerk starts

(D) None of the above

Answer: -Jerk starts

364. In an automobile, if the vehicle makes a left turn, the gyroscopic torque

(A) Decreases the forces on the outer wheels

(B) Increases the forces on the outer wheels

(C) Does not affect the forces on the outer wheels

(D) None of above

Answer: -Increases the forces on the outer wheels

365. A machine member used to connect engine shaft to gear box is called

(A) Differential

(B) Clutch

(C) Flywheel

(D) Propeller shaft

Answer: -Clutch

366. What is a byproduct of producing biodiesel?

(A) Polymer

(B) Methanol

(C) Glycerin

(D) Salt

Answer: -Glycerin

367. According to Aronhold Kennedy’s theorem, if three bodies move relatively to each other, their instantaneous centres will lie on a

(A) straight line

(B) parabolic curve

(C) Ellipse

(D) none of these

Answer: -straight line

368. The total number of instantaneous centres for a mechanism consisting of n links are

(A) n/2

(B) n

(C) n – 1/2

(D) n(n – 1)/2

Answer: -n(n – 1)/2

369. Oldham’s coupling is used to connect two shafts which are

(A) Intersecting

(B) Parallel

(C) Perpendicular

(D) Co-axial

Parallel

370.Two intersecting shafts can be connected by ............ gears?

(A) Straight spur

(B) Spiral

(C) Cross helical

(D) Straight bevel

Answer: -Straight bevel

AUTOMOBILE ENGINEERING MCQ SECTION 35

351.When the engines are built to withstand the same thermal and mechanical Stresses

(A) ηOtto > ηDual > ηDiesel 

(B)  ηDual > ηDiesel > ηOtto

(C)  ηDiesel > ηDual > ηOtto 

(D) ηOtto > ηDiesel > ηDual

Answer: -ηDiesel > ηDual > ηOtto

352.Mean effective pressure of Otto cycle is

(A) Inversely proportional to pressure ratio

(B) Directly proportional to pressure ratio

(C) Does not depend on pressure ratio

(D) Proportional to square root of pressure ratio

Answer: -Directly proportional to pressure ratio

353.For SI engine fuels most preferred are

(A) Aromatics

(B) Paraffins

(C) Olefins

(D) Napthenes

Answer: -Aromatics

354.Stoichiometric air-fuel ratio of alcohol when compared to gasoline is

(A) Higher

(B) Lower

(C) Equal

(D) None of the above

Answer: -Lower

355.In the coil spring rear suspension for a rear drive vehicle, the axle housing is kept in place by

(A) U-bolts

(B) The stabilizer bar

(C) Control arms

(D) The shock absorbers

Answer: -Control arms

356.For maximum thermal efficiency, the fuel-air mixture in SI engine should be

(A) Lean

(B) Rich

(C) Stoichiometric

(D) May be rich or lean

Answer: -Lean

357.With increase in compression ratio flame speed

(A) Increases

(B) Decreases

(C) Remain the same

(D) None of the above

Answer: -Increases

358.The type of rear axle used on trucks is

(A) Semi-floating

(B) Three-quarter floating

(C) Fully-floating

(D) None of above

Answer: -Fully-floating

359.Which stage of vehicle emission norms presently applicable in India in Internal Combustion Engine?

(A) Bharat Stage V

(B) Bharat Stage II

(C) Bharat Stage IV

(D) Bharat Stage III

Answer: -Bharat Stage IV

360. If the compressor runs, little or no difference in temperature between the low pressure and the high pressure lines indicates

(A) A full refrigerant charge

(B) Normal system operation

(C) Low or no refrigerant

(D) An overcharge of refrigerant oil

Answer: -Low or no refrigerant

AUTOMOBILE ENGINEERING MCQ SECTION 34

341.When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be

(A) to raise the bow and lower the stern

(B) to move the ship towards star-board

(C) to move the ship towards portside

(D) to raise the stern and lower the bow.

Answer: -to move the ship towards star-board

342.The buoyant force for a floating body passes through the

(A) Centroid of the displaced volume

(B) Centre of gravity of the body

(C) Centroid of volume of the body

(D) Meta-centre of the body

Answer: -Centroid of the displaced volume

343.The Otto cycle consists of

(A) two constant pressure processes and two constant volume processes

(B) two constant pressure and two constant entropy processes

(C) two constant volume processes and two constant entropy processes

(D) none of the mentioned

Answer: -two constant pressure and two constant entropy processes

344.Pascal second is the unit of

(A) Drag

(B) Dynamic viscosity

(C) Kinematic viscosity

(D) Pressure

Answer: -Dynamic viscosity

345.The standard atmospheric pressure (at sea level) is not equal to

(A) 760 mm Hg

(B) 18.2 m of benzene

(C) 10.3 m of H20

(D) 101.325 kPa

Answer: -18.2 m of benzene

346.Which of the following criteria need to be fulfilled for making two different pipe systems equivalent?

(A) Same length and diameter

(B) Same discharge and length

(C) Same pressure loss and discharge

(D) Same velocity and diameter

Answer: -Same pressure loss and discharge

347.Engine of different cylinder dimensions, power and speed are compared on the basis of

(A) Maximum pressure

(B) Fuel consumption

(C) Mean effective pressure

(D) Unit power

Answer: -Mean effective pressure

348.The mean effective pressure of an Otto Cycle increases with an increase in

(A) pressure ratio

(B) compression ratio

(C) temperature ratio

(D) none of the mentioned

Answer: -compression ratio

349.Inlet valve Mach index usually relates

(A) Mechanical efficiency

(B) Volumetric efficiency

(C) Brake thermal efficiency

(D) Relative efficiency

Answer: -Volumetric efficiency

350. In Otto cycle, heat addition takes place at

(A) constant temperature

(B) constant pressure

(C) none of the mentioned

(D)constant volume

Answer: -constant volume