WorksheetsTE-1 (UNIT TEST-1) GAS AND STEAM POWER CYCLE
Total questions: 20
Worksheet time: 3600secs
Air standard cycle for SI Engines is
Otto cycle
Diesel cycle
Brayton cycle
Dual Cycle
Efficiency of Otto cycle _________ with increase in compression ratio
decreases
remains constant
increases
slightly decreases
For same compression ratio and heat input, the efficiency of the air standard cycles are related as follows:
ηOtto < ηDiesel < ηdual
ηOtto >ηDiesel >ηdual
ηOtto< ηdual < ηDiesel
ηOtto > ηdual > ηDiesel
Compression ratio of an I C Engine is
Ratio of volume before compression to volume after compression
Ratio of volume after compression to volume before compression
Volume of air compressed in one cycle
None of the above
Mean effective pressure is
The pressure of charge inside the cylinder during expansion stroke of the cycle
The average pressure inside the cylinder during the entire cycle that would result in the same output as that of a normal cycle
Net work out put divided by swept volume of the cylinder
Both (b) and (c)
The minimum volume occupied by the fluid in the cylinder when the piston reaches TDC is
Swept volume
Stroke volume
Clearance volume
None of the above
When the compression ratio is constant in diesel cycle
The efficiency increases with increase in cut off ratio
The efficiency decreases with increase in cut off ratio
The efficiency is not affected by cut off ratio
The efficiency may increase or decrease with increase in cut off ratio
The major components in a Rankine cycle are
Compressor, combustion chamber, turbine and condenser
Boiler, compressor, condenser and turbine
Boiler, turbine, condenser and pump
Boiler, compressor, pump and turbine
Reheat is adopted in Rankine cycle when
Boiler is operated at low temperatures
Boiler is operated at low pressures
Boiler is operated at high pressure to ensure moisture content does not exceed 15%
Turbine exhaust has less moisture
Brayton cycle is not suitable for I C Engines, because
The maximum pressure in the cycle would be too high
The swept volume is too small
The maximum temperature in the cycle would be high
Swept volume required would be large
The Otto cycle is not suitable for Gas Turbine plants, because
Maximum temperature encountered will be high
The maximum pressure reached would be small
The efficiency of Otto cycle for same compression ratio would be less than that of Brayton cycle
More space is required
In an Otto cycle how many reversible adiabatic processes are invovled?
1
2
3
4
In a process, if the value of γ is replaced by n , then what is the name of the process
Isentropic
Polytropic
Isobaric
Isochoric
The volume of cutoff is generally expressed as_____?
% of clearance volume
% of stroke volume
Compression ratio
Expansion ratio
The mean effective pressure of a Diesel cycle is defined as the work done per cycle divided by_______?
Clearance Volume
Stroke Volume
All of the above
None of the above
The important parameters used for the comparison of the cycle are
Cut off ratio
Stroke volume
Work done
Compression ratio, Net-work
The air standard efficiency of an IC engine depends on
Fuel used
Speed of engine
Compression ratio
None of the above
