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MCQs 1: What is the purpose of analyser-rectifire in aqua-ammonia absorption system?

to absorb ammonia into the water to remove water vapour out from ammonia after generator to exchange heat between weak solution and strong solution none of the above
Answer Explanation

MCQs 2: What is an advantage using analyser-rectifier in aqua-ammonia absorption system?

it makes ammonia-water solution strong it prevents expansion valve from blocking due to ice formation both a. and b. none of the above
Answer Explanation

MCQs 3: For a same pressure the saturation temperature of ammonia is

higher than the saturation temperature of water lower than the saturation temperature of water same as the saturation temperature of water none of the above
Answer Explanation

MCQs 4: Which type of energy is required to expend in vapour absorption refrigeration system?

high-grade energy low-grade energy medium-grade energy none of the above
Answer Explanation

MCQs 5: The vapour absorption refrigeration system is

more noisy than the vapour compression refrigeration system more silent than the vapour compression refrigeration system equally noisy as the vapour compression refrigeration system it depends upon plant capacity
Answer Explanation

MCQs 6: For the same capacity of plant, the COP of the vapour absorption refrigeration system is

lower than the COP of the vapour compression refrigeration system higher than the COP of the vapour compression refrigeration system same as the COP of the vapour compression refrigeration system cannot say
Answer Explanation

MCQs 7: On psychrometric chart, wet bulb temperature lines are

horizontal with uniformly spaced horizontal with non-uniformly spaced inclined with uniformly spaced inclined with non-uniformly spaced
Answer Explanation

MCQs 8: At any point on the saturation curve in psychometric chart, the dry bulb temperature is always

less than the corresponding wet bulb temperature more than the corresponding wet bulb temperature equal to the corresponding wet bulb temperature cannot predict
Answer Explanation

MCQs 9: The moisture content lines in psychrometric chart are also called as

relative humidity lines specific humidity lines both a. and b. none of the above
Answer Explanation

MCQs 10: The natural draught in the steam generator depends upon

the air condition outside the chimney the temperature of exhaust gases both a. and b. none of the above
Answer Explanation

MCQs 11: What is the disadvantage of natural draught?

it has less life it has more maintenance cost of cleaning and more capital cost to build the chimney the available draught decreases with increasing outside air temperature all of the above
Answer Explanation

MCQs 12: Quasi-static process

is infinitely slow process experiences thermodynamic equilibrium at every small point on its path reversible process all of the above
Answer Explanation

MCQs 13: The thermocouple circuit which is used to measure temperature works on ____.

Seebeck effect Peltier effect Thomson effect none of the above
Answer Explanation

MCQs 14: Heat is transferred across a boundary by virtue of a temperature difference. The heat is transferred, that means

force transfer takes place energy transfer takes place temperature transfer takes place all of the above
Answer Explanation

MCQs 15: Total amount of energy in the universe is

increasing decreasing constant none of the above
Answer Explanation

MCQs 16: To achieve a definite zero point on the Kelvin scale, we have to violate

first law of thermodynamics second law of thermodynamics both first law and second law of thermodynamics no law has to be violated
Answer Explanation

MCQs 17: The temperature at which a system undergoes a reversible isothermal process without transfer of heat is called as _________

critical temperature Kelvin temperature absolute zero temperature reversible temperature
Answer Explanation

MCQs 18: Any attainable value of absolute temperature is ________

always less than zero always equals to zero always greater than zero none of the above
Answer Explanation

MCQs 19: Assume that a reversible heat engine is operating between a source at T1 and a sink at T2. If T2 decreases, the efficiency of the heat engine ______

decreases increases remains constant none of the above
Answer Explanation

MCQs 20: The irreversibility in the system caused by friction is an example of

internal irreversibility external irreversibility frictional irreversibility chemical irreversibility
Answer Explanation

MCQs 21: When a process becomes irreversible due to heat interaction between system and surrounding at the boundary due to finite temperature gradient, then the irreversibility is______

internal irreversibility external irreversibility mechanical irreversibility chemical irreversibility
Answer Explanation

MCQs 22: The degree of disorder of a mixture of two gases

is always less than the degrees of disorder of individual gases is always greater than the degrees of disorder of individual gases is always equals the degrees of disorder of individual gases none of the above
Answer Explanation

MCQs 23: What is the relation between thermodynamic probability (W) and entropy?

thermodynamic probability increases with entropy thermodynamic probability decreases with entropy thermodynamic probability does not change with change in with entropy none of the above
Answer Explanation

MCQs 24: At the most probable state of a system the entropy of the system is

minimum maximum constant none of the above
Answer Explanation

MCQs 25: At the state of perfect order (W = 1) of pure crystalline substance, how is the zero entropy defined?

entropy at 0 °C temperature entropy at absolute zero temperature entropy at the freezing point of the substance none of the above
Answer Explanation

MCQs 26: What is the reason behind the fact that the absolute zero entropy value is not attainable?

because absolute zero temperature is not attainable in finite number of operations because theoretically absolute zero temperature has negative value of entropy and it is not possible both a. and b. none of the above
Answer Explanation

MCQs 27: What is the entropy chosen at the triple point of water?

zero less than zero more than zero none of the above
Answer Explanation

MCQs 28: What is the difference between work done by a system through an ideal reversible process and actual work done by the system called?

irreversibility degradation dissipation all of the above
Answer Explanation

MCQs 29: Which will be a suitable condition of exergy loss and entropy generation for thermodynamically efficient process?

maximum exergy loss with minimum rate of entropy generation minimum exergy loss with maximum rate of entropy generation maximum exergy loss with maximum rate of entropy generation minimum exergy loss with minimum rate of entropy generation
Answer Explanation

MCQs 30: What is the value of exergy in general?

only negative only positive sometimes positive sometimes negative cannot say
Answer Explanation

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