MCQs 1: In a typical medium speed 4 stroke cycle diesel engine_______________?
exhaust valve opens at 35° before bot-tom dead center and closes at 20° after top dead center
exhaust valve opens at bottom ‘dead center and closes at top dead center
exhaust valve opens just after bottom dead center and closes just before top dead center
may open and close anywhere
none of the above is true
MCQs 2: The mean effective pressure obtained from engine indicator indicates the________________?
maximum pressure developed
minimum pressure
instantaneous pressure at any instant
exhaust pressure
average pressure
MCQs 3: Installation of supercharger on a four-cycle diesel engine can result in the following percentage increase in power_____________?
MCQs 4: Which of the following is the lightest and most volatile liquid fuel________________?
MCQs 5: Air fuel ratio for idling speed of a petrol engine is approximately_________________?
MCQs 6: For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of _________________?
MCQs 7: Pour point of fuel oil is the_________________?
minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in conta
temperature at which it solidifies or congeals
it catches fire without external aid
indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off
temperature at which it flows easily
MCQs 8: The air-fuel ratio in petrol engines-is controlled by__________________?
MCQs 9: Which is more viscous lub oil_________________?
MCQs 10: A stoichiometric air-fuel ratio is______________________?
chemically correct mixture
lean mixture
rich mixture for idling
rich mixture for over loads
the ratio used at full rated parameters
MCQs 11: In loop scavenging, the top of the piston is________________?
MCQs 12: In the crankcase method of scavenging, the air pressure is produced by_________________?
MCQs 13: In a naturally aspirated diesel engine, the air is supplied by________________?
MCQs 14: In the opposed piston diesel engine, the combustion chamber is located________________?
MCQs 15: In order to prevent formation of carbon on the injector, the temperature of nozzle tip should be__________________?
MCQs 16: Ignition quailty of petrol is expressed by___________________?
MCQs 17: Kerosene is distilled at________________?
MCQs 18: Iso-oct ,ne________________?
has octane number of 0
has octane number of 50
has octane number of 100
is an index of detonation quality
is an index of knocking quality
MCQs 19: Cetane___________________?
has zero cetane number
has 100 cetane number
helps detonation
is a straight chain paraffin
determines the efficiency of an I.C. engine
MCQs 20: The self-ignition temperature of diesel oil compared to petrol is_________________?
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