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MCQs 1: A diathermic wall is one which____________________?

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

MCQs 2: A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227° C and 27° C. His claim is__________________?

justified not possible may be possible with lot of sophistications cost will be very high theroretically possible
Answer Explanation

MCQs 3: An engine operates between temperatures of 900°Kandr2 and another engine between T2 and 400°K For both to do equal work, value of T2 will be________________?

650°K 600°K 625°K 700°K 750°K
Answer Explanation

MCQs 4: Carnot cycle efficiency depends upon________________?

properties of the medium/substance used condition of engine working condition temperature range of operation effectiveness of insulating material around the engine
Answer Explanation

MCQs 5: If a system after undergoing a series of processes, returns to the initial state then__________________?

process is thermodynamically in equilibrium process is executed in closed system cycle its entropy will change due to irreversibility sum of heat and work transfer will be zero no work will be done by the system
Answer Explanation

MCQs 6: Carnot cycle has maximum efficiency for__________________?

reversible engine irreversible engine new engine petrol engine diesel engine
Answer Explanation

MCQs 7: First law of thermodynamics___________________?

enables to determine change in internal energy of the system does not help to predict whether the system will or not undergo a change does not enable to determine change in entropy provides relationship between heat, work and internal energy all of the above
Answer Explanation

MCQs 8: According to first law of thermodynamics_______________________?

mass and energy are mutually convertible Carnot engine is most efficient heat and work are mutually convertible mass and light are mutually convertible heat flows from hot substance to cold substance
Answer Explanation

MCQs 9: In an isothermal process, the internal energy________________?

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

MCQs 10: First law of thermodynamics furnishes the relationship between______________________?

heat and work heat, work and properties of the system various properties of the system various thermodynamic processes heat and internal energy
Answer Explanation

MCQs 11: According to first law of thermodynamics__________________?

work done by a system is equal to heat transferred by the system total internal energy of a system during a process remains constant internal energy, enthalpy and entropy during a process remain constant total energy of a system remains constant entropy of a system remains constant
Answer Explanation

MCQs 12: For reversible adiabatic process, change in entropy is_________________?

maximum minimum zero unpredictable negative
Answer Explanation

MCQs 13: The more effective way of increasing efficiency of Carnot engine is to____________________?

increase higher temperature decrease higher temperature increase lower temperature decrease lower temperature keep lower temperature constant
Answer Explanation

MCQs 14: Molecular volume of any perfect gas at 600 x 103 N/m2 and 27°C will be ____________________?

4.17m3/kgmol 400 m3/kg mol 0.15 m3/kg mol 41.7 m3/kg mol 417m3/kgmol
Answer Explanation

MCQs 15: For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be___________________?

zero minimum maximum infinity there is no such criterion
Answer Explanation

MCQs 16: Which of the following processes is irreversible process___________________?

isothermal adiabatic throttling all of the above none of the above
Answer Explanation

MCQs 17: If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called___________________?

free expansion hyperbolic expansion adiabatic expansion parabolic expansion throttling
Answer Explanation

MCQs 18: If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as__________________?

free expansion hyperbolic expansion adiabatic expansion parabolic expansion throttling
Answer Explanation

MCQs 19: For which of the following substances, the internal energy and enthalpy are the functions of temperature only____________________?

any gas saturated steam water perfect gas superheated steam
Answer Explanation

MCQs 20: Universal gas constant is defined as equal to product of the molecular weight of the gas and_______________?

specific heat at constant pressure specific heat at constant volume ratio of two specific heats gas constant unity
Answer Explanation

MCQs 21: The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is______________________?

29.27 kgfm/mol°K 8314kgfm/mol°K 848kgfm/mol°K 427kgfm/mol°K 735 kgfm/mol°K
Answer Explanation

MCQs 22: For which of the following substances, the gas laws can be used with minimum error_________________?

dry steam wet steam saturated steam superheated steam steam at atmospheric pressure
Answer Explanation

MCQs 23: One watt is equal to__________________?

1 Nm/s 1 N/mt 1 Nm/hr 1 kNm/hr 1 kNm/mt
Answer Explanation

MCQs 24: If a certain amount of dry ice is mixed with same amount of water at 80°C, the final temperature of mixture will be__________________?

80°C 0°C 40°C 20°C 60°C
Answer Explanation

MCQs 25: In an isothermal process, the internal energy of gas molecules________________?

increases decreases remains constant may increase/decrease depending on the properties of gas shows unpredictable behaviour
Answer Explanation

MCQs 26: The term N.T.P. stands for________________________?

nominal temperature and pressure natural temperature and pressure normal temperature and pressure normal thermodynamic practice normal thermodynamic pressure
Answer Explanation

MCQs 27: The index of compression n tends to reach ratio of specific heats y when____________________?

flow is uniform and steady process is isentropic process is isothermal process is isentropic and specific heat does not change with temperature process is isentropic and specific heat changes with temperature
Answer Explanation

MCQs 28: Solids and liquids have___________________?

one value of specific heat (ft) two values of specific heat three values of specific heat no value of specific heat one value under some conditions and two values under other conditions
Answer Explanation

MCQs 29: Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure___________________?

enthalpy volume mass entropy specific volume
Answer Explanation

MCQs 30: Work done in an adiabatic process between a given pair of end states depends on__________________?

the end states only particular adiabatic process the value of index n the value of heattransferred mass of the system
Answer Explanation

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