In a diesel engine, the fuel is ignited by___________________?
(A) spark
(B) injected fuel
(C) heat resulting from compressing air that is supplied for combustion
(D) ignition
(D) combustion chamber
The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is__________________?
(A) same
(B) less
(C) more
(D) more or less depending on power rating
(D) unpredictable
Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ?
(A) yes
(B) no
(C) to some extent
(D) unpredictable
(D) depends on other factors
Scavenging air in diesel engine means___________________?
(A) air used for combustion sent under pres-sure
(B) forced air for cooling cylinder
(C) burnt air containing products of combustion
(D) air used for forcing burnt gases out of engine’s cylinder during the exhaust period
(D) air fuel mixture
The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft___________________?
(A) 1/2
(B) 1
(C) 2
(D) 4
(D) 8
The knock in diesel engine occurs due to____________________?
(A) instantaneous and rapid burning of the first part of the charge
(B) instantaneous atuo iginition of last part of charge
(C) delayed burning of the first part of the charge
(D) reduction of delay period
(D) all ot the above
The output of a diesel engine can be increased without increasing the engine revolution or size in following way_________________?
(A) feeding more fuel
(B) increasing flywheel size
(C) heating incoming air
(D) scavenging
(D) supercharging
Which of the following is not an interns combustion engine___________________?
(A) 2-stroke petrol engine
(B) 4-stroke petrol engine
(C) diesel engine
(D) gas turbine
(D) steam turbine
The air requirement of a petrol engine during starting compared to theoretical airequired for complete combustion is___________________?
(A) more
(B) loss
(C) same
(D) may be more or less depending on engine capacity
(D) unpredictable
The specific fuel consumption per BHP hour for diesel engine is approximately___________________?
(A) 0.15 kg
(B) 0.2 kg
(C) 0.25 kg
(D) 0.3 kg
(D) 0.35 kg