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Right answer is (b) 145 mm WIDTH, 13” diameter, radial-ply

The EXPLANATION: The tire designation is of the form width (mm), SPEED rating, type of ply, and diameter (in) in the same order. So 145 SR – 13 signifies that width = W = 145 mm, speed rating = S which is up to 170 Kmph, the ply is of radial type, and diameter = 13” or 13 in = 330 mm.

Correct option is (b) Equalize wear

To explain I would SAY: Equalize wear is the PURPOSE of tire rotation on automobiles. The advantage of TIRES wearing uniformly is wear REDUCES a tire’s tread depth equally if all the tires wear at the same rate.

Correct option is (c) Cross-ply TIRES on front wheels

Explanation: The PERMISSIBLE of mixing cross-ply and radial-ply AUTOMOBILE tires ALLOW cross-ply tires on front wheels. In cross-ply type tires, the ply cords are woven at an angle to the TIRE axis.

The correct choice is (a) Near CENTER

For explanation I WOULD say: An overinflated tire will WEAR the thread near the center. This type of tire break is caused when an object is hit with a FORCE.

Right CHOICE is (b) Rated STRENGTH

To explain: The ‘ply RATING’ REFERS to rated strength. It is referred to the number of layers of cotton from which the ply is MADE. The ply rating is high that means the size of the tire is tough.

Right option is (a) TENSION

Best explanation: The vehicle WEIGHT is supported by the wire in tension in case of a wire wheel. The side FORCES on cornering are taken up by the spoke FORMING triangular arrangement.

The correct ANSWER is (c) semi-steel

The explanation: Semi-steel provides a strong and harder CASTING also good THERMAL conductivity, which permits thin casting WALLS and improving cooling.

The CORRECT CHOICE is (B) oil sump

To elaborate: Oil sump or oil pan which is bottom half of crank case it is bolted or screwed to the lower flange of MAIN casting.

Correct answer is (b) felicoid

Explanation: FELICOD is a type of PUMP gasket which is improvement on cork. It is less SUBJECT to SHRINKAGE and expansion. It can also withstand CONSIDERABLE bending and twisting without breakage.

The correct answer is (d) easy removal

For explanation I would SAY: Cylinder HEAD are casted as separate piece generally for easy removal also to provide correct provision for spark plug, INJECTOR, flow of water etc.,

Correct answer is (c) cylinder head STICK to cylinder block

For explanation I WOULD say: DUE to corrosion and over HEATING of the engine due to the piston sliding movements up and down, the cylinder block will GET attached to the cylinder block which in turns lead to total replacement of the entire engine setup.

Right choice is (b) HIGH THERMAL conductivity

To explain: Generally CYLINDER HEADS are COATED with grey cast iron and aluminium alloy. The main advantage for the aluminium alloy over the cast iron is high thermal conductivity which can withstand about 1000°C without much expansion and deformation.

Right choice is (a) gasket

The EXPLANATION is: Gaskets are coated with SPECIAL varnish which melts and seals all the SMALL inter sticks of the block and head when the engines warms up. The gaskets besides WITHSTANDING high PRESSURE should also withstand high temperature also.

The correct ANSWER is (b) cylinder head

Explanation: Since cylinder head only consists of the combustion chamber which in TURN connects with the cooling water PASSAGES for cooling down of the ENGINE or to prevent the over heating of engine.

Right CHOICE is (a) DENSITY

Easiest explanation: Density of ALUMINIUM is one-third of cast iron and it is a LIGHT weight material which is advantage over cast iron.

The CORRECT option is (a) grey CAST IRON

Explanation: Since cylinder block has to withstand more SLIDING of piston the material should be good in WEARING properties so grey cast iron material is used for cylinder block.

Correct choice is (d) ALUMINIUM

The EXPLANATION: Aluminium is of lighter weight and is easily available in the MARKET so which can be replaced easily with comparatively lower PRICE.

Correct answer is (B) rigid structure

To elaborate: CYLINDER block and CRANK case are made of single casting to make them a rigid structure since they should WITHSTAND high temperature and to have GOOD wear properties.

The correct ANSWER is (a) cylinder block

To explain: Because cylinder block is outer BODY of the engine which encloses all other parts LIKE piston, connecting rod etc.

Correct option is (a) CRANK case

To explain I would say: Crank case is attached to the bottom part of the cylinder block which serves as a base of engine, which supports crankshaft and camshaft in suitable BEARINGS also PROVIDES an arm for SUPPORTING engine on FRAME.

Correct answer is (C) RIMS

To ELABORATE: SINCE rims forms/gives an outer layer for crankcase they are used besides they too have HIGH wear properties.

Right answer is (b) 298.05 mm

The best I can explain: Radius of the WHEEL = ½ * 14 = 7 in = 177.8 mm. SECTION height of TIRE = 0.65 * 185 = 120.25 mm. Rolling radius of the original tires = 177.8 + 120.25 = 298.05 mm.

The correct choice is (d) SHIMBESTOS

The best explanation: Shimbestos is a cylinder GASKETS which is combination of thin STEEL HEAT shield on one side and a high resilient specially treated metal reinforced asbestos on the top.

The correct ANSWER is (c) felcoperne

Easy explanation: Felcoperne is synthetic rubber compound with good resilient and compressible. It is not affected by expansion or shrinkage. Compared to other oil pan gaskets LIKE cork and FELICOD felcoperene is preferred now-a-days.

Correct CHOICE is (c) Magnesium alloy wheel

Explanation: Magnesium alloy wheels are preferred in sports cars. Magnesium alloy wheels have high impact and fatigue strength so that they can stand VIBRATION and SHOCK loading BETTER.

Correct OPTION is (c) chromium

The explanation is: Chromium a very HARD METAL with high coefficient of THERMAL expansion so USED to reduce wall wear and to promote service life.