320 Important Engineering Thermodynamics MCQ Question and Answer | PDF Free Download
1.A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is
- A54°C
- B327°C
- C108°C
- D654°C
2.In closed cycle gas turbine, the air is compressed
- AIsothermally
- BIsentropically
- CPolytropically
- DNone of these
3.The following cycle is used for air craft refrigeration
- ABrayton cycle
- BJoule cycle
- CCarnot cycle
- DReversed Brayton cycle
4.According to Avogadro's Hypothesis
- AThe molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature
- BThe sum of partial pressure of mixture of two gases is sum of the two
- CProduct of the gas constant and the molecular weight of an ideal gas is constant
- DGases have two values of specific heat
5.For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.
- AGreater than
- BLess than
- CEqual to
- DNone of these
6.The efficiency of the dual combustion cycle for the same compression ratio is __________ Diesel cycle.
- AGreater than
- BLess than
- CEqual to
- DNone of these
7.The efficiency of Ericsson cycle is __________ Carnot cycle.
- AGreater than
- BLess than
- CEqual to
- DNone of these
8.The efficiency of Stirling cycle is __________ Carnot cycle.
- AGreater than
- BLess than
- CEqual to
- DNone of these
9.According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible.
- AFirst kind
- BSecond kind
- CThird kind
- DNone of these
10.According to Gay Lussac’s law for a perfect gas, the absolute pressure of given mass varies directly as
- ATemperature
- BAbsolute temperature, if volume is kept constant
- CVolume, if temperature is kept constant
- DNone of these
11.The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is
- A0.086
- B1.086
- C1.086
- D4.086
12.Work done in a free expansion process is
- AZero
- BMaximum
- CMinimum
- DPositive
13.The condition of perfect vacuum, i.e., absolute zero pressure can be attained at
- AA temperature of - 273.16°C
- BA temperature of 0°C
- CA temperature of 273 °K
- DA negative pressure and 0°C temperature
14.For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be
- AZero
- BMinimum
- CMaximum
- DInfinity
15.One kg of carbon requires 4/3 kg of oxygen and produces __________ kg of carbon monoxide gas.
- A8/3
- B11/3
- C11/7
- D7/3
16.The natural petroleum may be separated into
- APetrol
- BKerosene
- CFuel oil
- DLubricating oil
17.According to Regnault's law, the specific heat at constant pressure (cp) and specific heat at constant volume (cv) _________ with the change in pressure and temperature of the gas.
- AChange
- BDo not change
- CBoth (A) and (B)
- DNone of these
19.In open cycle gas turbine plants
- ADirect combustion systems is used
- BA condenser is used
- CThe indirect heat exchanger and cooler is avoided
- DAll of the above
20.Producer gas is obtained by
- ACarbonization of bituminous coal
- BPartial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
- CPassing steam over incandescent coke
- DPassing air and a large amount of steam over waste coal at about 650°C