21-The chassis frame of vehicles is narrow at the front, because:

(A) It gives smaller turning radius to the vehicle

(B) Number of tyres is less at the front

(C) Weight of the vehicle is less at the front

(D) It helps to reduce the weight of the frame

22-The metal used for body building of automobiles is generally:

(A) Cast iron

(B) Steel

(C) Copper

(D) Aluminium

23-Spark plug ‘reach’ means:

(A) The heat range of the spark plug

(B) The length of central electrode

(C) The length of the threaded portion of the spark plug shell

(D) The gap between the spark plug terminals

24-In an automobile, solenoid switch is a part of:

(A) Starting system

(B) Ignition system

(C) Charging system

(D) Lighting system

25-Which of the following is not a function of fuel injection system in the diesel engine?

(A) To atomise the fuel

(B) To supply the fuel into the cylinder in mentioned quantity

(C) To prepare air-fuel mixture in the inlet manifold for combustion

(D) To pressurize the fuel so that it can enter into the compressed air in the cylinder

26-The positive crankcase ventilation system helps:

(A) To redirect the blow by gases in the crankcase to inlet manifold

(B) To reduce the atmospheric pollution caused by the engine

(C) To prevent air dilution and sludge formation

(D) All of the above

27-The force which retards the motion of one body, in contact with another body is called

(A) Friction

(B) Adhesion

(C) Cohesion

(D) Torsion

28-If you notice the presence of engine oil inside the radiator filler neck, the reason can be:

(A) Defective radiator pressure cap

(B) Damaged cylinder head gasket

(C) Defective thermostat valve

(D) Defective oil pump

29-Which process gives the engine cylinder a cross hatch pattern?

(A) Drilling

(B) Boring

(C) Facing

(D) Honing

30-In a diesel engine, the fuel gets ignited by:

(A) Fuel injector

(B) Electric spark

(C) Heater plug

(D) Heat of compressed air

ANSWERS:

21-(A), 22-(B), 23-(C), 24-(A), 25-(C), 26-(D), 27-(B), 28-(B), 29-(D), 30-(D)