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.Management Sciences
Category: I.C. Engines
A stoichiometric air-fuel ratio is______________________?
A. chemically correct mixture
B. lean mixture
C. rich mixture for idling
D. rich mixture for over loads
E. the ratio used at full rated parameters
Ignition quailty of petrol is expressed by___________________?
A. octane number
B. cetane number
C. calorific value
D. self ignition temperature
E. distillation temperature
In petrol engine, increase of cooling water temperature will_________________?
A. increase the knocking tendency
B. decrease the knocking tendecny
C. not affect the knocking tendency
D. increase or decrease knocking tendency depedning on strength and time of spark
E. unpredictable
Cetane___________________?
A. has zero cetane number
B. has 100 cetane number
C. helps detonation
D. is a straight chain paraffin
E. determines the efficiency of an I.C. engine
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
E. supercharging
The size of inlet valve of.an engine in comparison to exhaust valve is_________________?
A. more
B. less
C. same
D. more/less depending on capacity of engine
E. varies from design to design
The specific fuel consumption for a petrol engine first decreases with increase in fuel air ratio and then increases with further increase in fuel air ratio. The minimum value occurs in the range of__________________?
A. lean mixture
B. chemically correct mixture
C. rich mixture
D. unpredictable
E. none of the above
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
The maximum temperature in the I.C. engine cylinder is of the order of ________________?
A. 500- 1000°C
B. 1000- 1500°C
C. 1500-2000°C
D. 2000-2500°C
E. 2500-3000°C
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