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Directions to Solve

Find the correctly spelt words.

Q1: (solve as per the direction given above)

A Garuntee

B Guarantee

C Gaurantee

D Guaruntee

Q2: In compression ignition engines, swirl denotes a

A rotary motion of the gases in the chamber

B none of the above

C haphazard motion of the gases in the chamber

D radial motion of the gases in the chamber

Q3: A mixture containing 65% of iso-octane and 35% of normal heptane will have

A octane number 35

B octane number 65

C qetane number 35

D cetane number 65

Q4: Which of the following statement is wrong ?

A In compression ignition engines, because of hetrogeneous mixture, the rate of pressure rise is comparatively lower.

B In compression ignition engines, detonation occurs near the beginning of combustion.

C To eliminate knock in compression ignition engines, we want to achieve auto-ignition not early and desire a long delay period.

D Since the fuel, in compression ignition engines, is injected at the end of compression stroke, therefore, there will be no pre-ignition.

Q5: The maximum propulsive efficiency of a turbo-jet engine is at a speed of

A 2000 km/h

B 2400 km/h

C 3000 km/h

D 1000 km/h

Q6: In order to mix air and petrol in the required proportion and to supply it to the engine during suction stroke, then __________ is employed.

A carburettor

B injector

C fuel pump

D none of these

Q7: The advancing of spark timing in spark ignition engines will __________ knocking tendency.

A reduce

B increase

C not effect

Q8: The knocking in spark ignition engines can be reduced by

A both (a) and (b)

B increasing the engine speed

C retarding the spark

D none of these

Q9: An atom bomb utilises uncontrolled nuclear fission.

A False

B True

Q10: The ratio of the brake power to the indicated power is called

A mechanical efficiency

B indicated thermal efficiency

C overall efficiency

D volumetric efficiency