Petrol Engine & Thermostat Valve
49. The top and bottom halves of connecting rod are bolted on
A. crankshaft man journal   
B. crankpin journal   
C. camshaft   
D. piston pin boss

50.  if thermostat valve remains closed then
A. engine will over heat   
B. rough idling   
C. engine will warm up slowly  
D. starting will be difficult

51. If thermostat valve remains in an open position then which of the following will happen
A. slow warming up to engine  
B. engine will over heat   
C. engine fails to start  
D. stalling of engine

52.During suction stroke the charge drawn in a petrol engine is
A. air only   
B. air and petrol mixture   
C. petrol only   
D. fuels other than petrol

53.  In a petrol engine air fuel mixture is drawn into the cylinder due to vacuum created during
A. power stroke   
B. exhaust stroke  
C. suction stroke   
D. compression stroke

54. The float circuit is provided in a carburetor
A. to store fuel vapours   
B. to supply mixture of air & fuel  
C. to maintain proper level of fuel in float chamber   
D. none of the above

55.  Air-fuel ration  changes according to certain operating conditions like
A. speed only  
B. speed and load only   
C. load only   
D. speed, load and temperature

56. When air passes through air horn, it
A. crates vacuum in the venture   
B. creates pressure in the venture   
C. cleans air horn tube  
D. fills up the cylinder bore

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