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MCQs 1: Work done is zero for the following process_________________?

constant volume free expansion throttling all Of the above none of the above
Answer Explanation

MCQs 2: In a non-flow reversible process for which p = (- 3V+ 15) x 105N/m2,V changes from 1 m to 2 m3. The work done will be about_______________?

100 xlOO5 joules lxlO5 joules 10 xlO5 joules 10 xlO5 kilo joules 10xl04kiojoules
Answer Explanation

MCQs 3: On volume basis, air contains following parts of oxygen _____________________?

21 23 25 77 79
Answer Explanation

MCQs 4: The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is________________?

29.27 J/kmol°K 83.14J/kmol°K 848J/kmol°K All J/kmol °K 735 J/kmol °K
Answer Explanation

MCQs 5: In a free expansion process___________________?

work done is zero heat transfer is zero both A. and B. above work done is zero but heat increases work done is zero but heat decreases
Answer Explanation

MCQs 6: The specific heat of air increases with increase in __________________?

temperature pressure both pressure and temperature variation of its constituents air flow
Answer Explanation

MCQs 7: Which of the following processes are thermodynamically reversible___________________?

throttling free expansion constant volume and constant pressure hyperbolic and pV = C isothermal and adiabatic
Answer Explanation

MCQs 8: In order that a cycle be reversible, following must be satisfied ________________?

free expansion or friction resisted expansion/compression process should not be encountered when heat is being absorbed, temperature of hot source and working sub¬stance should be same when beat is being rejected, temperature of cold source and working sub-stance should be same all of the above none of the above
Answer Explanation

MCQs 9: Minimum work in compressor is possible when the value of adiabatic index n is equal to_________________?

0.75 1 1.27 1.35 2
Answer Explanation

MCQs 10: A gas is compressed in a cylinder by a movable piston to a volume one-half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be___________________?

300 Nm 300,000 Nm 30 Nm 3000 Nm 30,000 Nm
Answer Explanation

MCQs 11: Entropy change depends on___________________?

heat transfer mass transfer change of temperature thermodynamic state change of pressure and volume
Answer Explanation

MCQs 12: Energy can neither be created nor destroyed but can be converted from one form to other is inferred from_________________?

zeroth low of thermodynamic first law of thermodynamics second law to thermodynamics basic law of thermodynamics claussius statement
Answer Explanation

MCQs 13: Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant________________?

pressure temperature volume internal energy entropy
Answer Explanation

MCQs 14: Isochoric process is one in which___________________?

free expansion takes place very little mechanical work is done by the system no mechanical work is done by the system all parameters remain constant mass and energy transfer do not take place
Answer Explanation

MCQs 15: Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant_______________?

pressure temperature volume internal energy entropy
Answer Explanation

MCQs 16: Total heat of a substance is also known as __________________?

internal energy entropy thermal capacity enthalpy thermal conductance
Answer Explanation

MCQs 17: Addition of heat at constant pressure to a gas results in________________?

raising its temperature raising its pressure raising its volume raising its temperature and doing external work doing external work
Answer Explanation

MCQs 18: Measurement of temperature is based on_________________?

thermodynamic properties zeroth law of thermodynamics first law of thermodynamics second law of thermodynamics joule’s law
Answer Explanation

MCQs 19: Carnot cycle efficiency is maximum when______________?

initial temperature is 0°K final temperature is 0°K difference between initial and final temperature is 0°K final temperature is 0°C initial temperature is minimum possible
Answer Explanation

MCQs 20: If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly_________________?

temperature enthalpy internal energy entropy all of the above
Answer Explanation

MCQs 21: An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is___________________?

feasible impossible possible possible, but with lot of sophistications desirable
Answer Explanation

MCQs 22: In a Carnot cycle, heat is transferred at_______________________?

constant pressure constant volume constant temperature constant enthaply any one of the above
Answer Explanation

MCQs 23: An adiabatic wall is one which__________________?

prevents thermal interaction permits thermal interaction encourages thermal interaction discourages thermal interaction dos not exist
Answer Explanation

MCQs 24: Compressed air coming out from a punctured football___________________?

becomes hotter becomes cooler1 remains at the same temperature may become hotter or cooler depend-ing upon the humidity of the surround¬ing air attains atmospheric temperature
Answer Explanation

MCQs 25: During throttling process___________________?

heat exchange does not take place no work is done by expanding steam there is no change of internal energy of steam all of the above entropy decreases
Answer Explanation

MCQs 26: A sudden fall in the barometer reading is a sign of approaching________________?

fine weather rains storm cold wave hot wave
Answer Explanation

MCQs 27: Calorie is a measure of

specific heat quantity of heat thermal capacity entropy work
Answer Explanation

MCQs 28: Barometric pressure is equal to_____________________?

760 mm Hg zero mm Hg 735.6 mm Hg 1 mm Hg 100mm Hg
Answer Explanation

MCQs 29: The first law of thermodynamics is the law of_________________?

conservation of mass conservation of energy conservation of momentum conservation of heat conservation of temperature
Answer Explanation

MCQs 30: Kelvin Planck’s law deals with___________________?

conservation of heat conservation of work conversion of heat into work conversion fo work into heat conservation of mass
Answer Explanation

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