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Directions to Solve

Find the correctly spelt words.

Q1: (solve as per the direction given above)

A Gaurantee

B Garuntee

C Guarantee

D Guaruntee

Q2: In compression ignition engines, swirl denotes a

A radial motion of the gases in the chamber

B haphazard motion of the gases in the chamber

C rotary motion of the gases in the chamber

D none of the above

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

A octane number 65

B cetane number 65

C qetane number 35

D octane number 35

Q4: Which of the following statement is wrong ?

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

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

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

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

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

A 2000 km/h

B 1000 km/h

C 2400 km/h

D 3000 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 fuel pump

C injector

D none of these

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

A increase

B reduce

C not effect

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

A retarding the spark

B both (a) and (b)

C none of these

D increasing the engine speed

Q9: An atom bomb utilises uncontrolled nuclear fission.

A True

B False

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

A mechanical efficiency

B volumetric efficiency

C overall efficiency

D indicated thermal efficiency