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WorksheetsThermal Engineering Unit I (Gas and Steam Power Cycles)
Total questions: 15
Worksheet time: 6mins
Air standard cycle for C I engines is
Otto cycle
Carnot cycle
Brayton cycle
Diesel cycle
Air standard cycle for SI Engines is
Otto cycle
Diesel cycle
Brayton cycle
Dual Cycle
Air standard cycle for Gas Turbine Power Plant is
Otto cycle
Brayton cycle
Diesel 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 effect of regeneration in Brayton cycle is:
Increase in net work output
decrease in net work output
decrease in heat input and increase in efficiency
none of the above
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
Regeneration in Gas Turbine Plant would be useful only when
The temperature of exhaust gas is above that of compressed air
The temperature of compressed air is above that of exhaust gas
The temperature of exhaust gas is equal to that of compressed air
The temperature of air entering the compressor is above that of exhaust gas
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
