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MCQs 1: Thermal power plant works on______________?

Carnot cycle Joule cycle Rankine cycle Otto cycle Brayton cycle
Answer Explanation

MCQs 2: Otto cycle consists of following four processes____________________?

two isothermals and two isentropics two isentropics and two constant volumes two isentropics, one constant volume and one constant pressure two isentropics and two constant pres-sures none of the above
Answer Explanation

MCQs 3: For same compression ratio and for same heat added_________________?

Otto cycle is more efficient than Diesel cycle Diesel cycle is more efficient than Otto cycle efficiency depends on other factors both Otto and Diesel cycles are equally efficient none of the above
Answer Explanation

MCQs 4: Carnot cycle is__________________?

a reversible cycle (ft) an irreversible cycle a semi-reversible cycle a quasi static cycle an adiabatic irreversible cycle
Answer Explanation

MCQs 5: If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle___________________?

more less equal depends on other factors none of the above
Answer Explanation

MCQs 6: A cycle consisting of two adiabatics and two constant pressure processes is known as___________________?

Otto cycle Ericsson cycle Joule cycle Stirling cycle Atkinson cycle
Answer Explanation

MCQs 7: Brayton cycle consists’ of following four processes____________________?

two isothermals and two isentropics two isentropics and two constant volumes two isentropics, one constant volume and one constant pressure two isentropics and two constant pres-sures none of the above
Answer Explanation

MCQs 8: The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as_________________?

Dual combustion cycle Diesel cycle Atkinson cycle Rankine cycle Stirling cycle
Answer Explanation

MCQs 9: Which of the following cycles has maximum efficiency_____________?

Rankine Stirling Carnot Brayton Joule
Answer Explanation

MCQs 10: The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will______________?

increase decrease remain unchanged increase/decrease depending on ap-plication unpredictable
Answer Explanation

MCQs 11: Gas turbine cycle consists of___________________?

two isothermals and two isentropics two isentropics and two constant volumes two isentropics, one constant volume and one constant pressure two isentropics and two constant pressures none of the above
Answer Explanation

MCQs 12: The ideal efficiency of a Brayton cycle without regeneration with increase ni pressure ratio will_________________?

increase decrease remain unchanged increase/decrease depending on application unpredictable
Answer Explanation

MCQs 13: The following cycle is used for air craft refrigeration___________________?

Brayton cycle Joule cycle Carnot cycle Bell-Coleman cycle Reversed-Brayton cycle
Answer Explanation

MCQs 14: The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that___________________?

carnot cycle can’t work with saturated steam heat is supplied to water at temperature below the maximum temperature of the cycle a rankine cycle receives heat at two places rankine cycle is hypothetical none of the above
Answer Explanation

MCQs 15: The efficiency of Diesei cycle with decrease in cut off_________________?

increases decreases remains unaffected first increases and then decreases first decreases and then increases
Answer Explanation

MCQs 16: Which of the following cycles is not a reversible cycle_____________________?

Carnot Ericsson Stirling Joule none of the above
Answer Explanation

MCQs 17: Reversed joule cycle is called_________________?

Carnot cycle Rankine cycle Brayton cycle Bell Coleman cycle Dual cycle
Answer Explanation

MCQs 18: Stirling and Ericsson cycles are__________________?

reversible cycles irreversible cycles quasi-static cycles semi-reversible cycles adiabatic irreversible cycles
Answer Explanation

MCQs 19: Diesel cycle consists of following four processes_________________?

two isothermals and two isentropics two isentropics, and two constant volumes two isentropics, one constant volume and one constant pressure two isentropics and two constant pressures none of the above
Answer Explanation

MCQs 20: The efficiency of Carnot cycle is maximum for_____________________?

gas engine well lubricated engine petrol engine steam engine reversible engine
Answer Explanation

MCQs 21: The efficiency of a Carnot engine depends on_______________________?

working substance design of engine size of engine type of fuel fired temperatures of source and sink
Answer Explanation

MCQs 22: Which of the following is an irreversible cycle_____________________?

carnot Stirling ericsson all of the above none of the above
Answer Explanation

MCQs 23: According to Clausis statement of second law of thermodynamics___________________?

heat can’t be transferred from low temperature source to high temperature source heat can be transferred for low temperature to high temperature source by using refrigeration cycle heat can be transferred from low temperature to high temperature source if COP of process is more than unity heat can’t be transferred from low temperature to high temperature source without the aid of external energy all of the above
Answer Explanation

MCQs 24: A perpetual motion machine is___________________?

a thermodynamic machine a non-thermodynamic machine a hypothetical machine a hypothetical machine whose opera-tion would violate the laws of thermodynamics an inefficient machine
Answer Explanation

MCQs 25: One barometric pressure or 1 atmospheric pressure is equal to___________________?

1 kgf/cnr2 1.033 kgf/cm2 0 kgf/cm2 1.0197 kgf/cm2 100 kgf/cm2
Answer Explanation

MCQs 26: I kgf/cm2 is equal to________________?

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

MCQs 27: The unit’of universal gas constant is___________________?

watts/°K dynes/°C ergscm/°K erg/°K none of the above
Answer Explanation

MCQs 28: The energy of molecular motion appears as________________?

heat potential energy surface tension friction increase in pressure
Answer Explanation

MCQs 29: Water contained in a beaker can be made to boil by passing steam through it__________________?

at atmospheric pressure at a pressure below the firuosphejric pressure at a pressure greater than atmospheric pressure any pressure not possible
Answer Explanation

MCQs 30: The door of a running refrigerator inside a room was left open____________________?
Which of the following statements is correct ?

The room will be cooled to the temperature inside the refrigerator The room will be cooled very slightly The room will be gradually warmed up The temperature of the air in room will remain unaffected any one of above is possible depending on the capacity
Answer Explanation

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