If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the %age increase in efficiency will be________________?
A. 2%
B. 4%
C. 8%
D. 14%
E. 27%.
Month: January 2019
The pressure at the end of compression in the case of diesel engine is of the order of___________________?
The pressure at the end of compression in the case of diesel engine is of the order of___________________?
A. 6 kg/cm
B. 12kg/cmz
C. 20 kg/cmz
D. 27.5 kg/cmz
E. 35 kg/cm
In a typical medium speed 4-stroke cycle diesel engine the inlet valve_____________________?
In a typical medium speed 4-stroke cycle diesel engine the inlet valve_____________________?
A. opens at 20° before top dead center and closes at 35° after the bottom dead center
B. opens at top dead center and closes at bottom dead center
C. opens at 10° after top dead center and closes 20° before the bottom dead center
D. may open or close anywhere
E. remains open for 200°.
An engine indicator is used to determine the following___________________?
An engine indicator is used to determine the following___________________?
A. speed
B. temperature
C. volume of cylinder
D. m.e.p. and I.H.P.
E. BHP
If the intake air temperature of I.C. engine increases, its efficiency will_________________?
If the intake air temperature of I.C. engine increases, its efficiency will_________________?
A. increase
B. decrease
C. remain same
D. unpredictable
E. depend on other factors
The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called__________________?
The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called__________________?
A. net efficiency
B. efficiency ratio
C. relative efficiency
D. overall efficiency
E. cycle efficiency
In a diesel engine, the fuel is ignited by___________________?
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
E. combustion chamber
The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is__________________?
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
E. unpredictable
Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ?
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
E. depends on other factors
Scavenging air in diesel engine means___________________?
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
E. air fuel mixture