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MCQs 1: What is the criterion provided by Clausius inequality for the process which is impossible?

Cyclic ∫ (đQ/T) = 0 Cyclic ∫ (đQ/T) > 0 Cyclic ∫ (đQ/T) < 0 all above processes are possible
Answer Explanation

MCQs 2: Which condition is correct according to the entropy principle?

the entropy of an isolated system can never decreases the entropy of a system remains constant only when the process is reversible the entropy of a system increases when the process is irreversible all of the above
Answer Explanation

MCQs 3: What is available energy (A. E.)

Energy supplied to a cyclic heat engine Maximum energy utilized to produce maximum work from a certain heat supplied to a cyclic heat engine Minimum heat energy rejected to sink by second law Maximum heat energy rejected to sink by second law
Answer Explanation

MCQs 4: What is unavailable energy (U. E.)

Energy supplied to a cyclic heat engine Maximum energy utilized to produce maximum work from a certain heat supplied to a cyclic heat engine Minimum heat energy rejected to sink by second law Maximum heat energy rejected to sink by second law
Answer Explanation

MCQs 5: What is the effect on exergy output of a process, when heat is transferred through a finite temperature difference?

exergy output increases exergy output decreases exergy output remains same none of the above
Answer Explanation

MCQs 6: What is the saturated solid state?

a state at which solid can change into liquid at constant pressure but changing temperature a state at which solid can change into liquid at constant temperature but change in pressure a state at which solid can change into liquid at constant pressure and temperature none of the above
Answer Explanation

MCQs 7: What is the state, at which saturated liquid line with respect to vaporisation and saturated vapour line on p-v diagram of pure substance, meet called?

saturation state critical state vaporisation state superheated vapour state
Answer Explanation

MCQs 8: The volume occupied by one number of unit mol of gas is called as

molecular volume mol volume molar volume none of the above
Answer Explanation

MCQs 9: What is the inversion curve in isenthalpic expansion or Joule-Kelvin expansion?

the locus of all points at which Joule-Kelvin coefficient is negative the locus of all points at which Joule-Kelvin coefficient is positive the locus of all points at which Joule-Kelvin coefficient is zero none of the above
Answer Explanation

MCQs 10: Which is the affecting factor for the fact that turbine work output is more than pump work input in vapour power cycle for the same pressure ratio?

specific heat added to the working fluid specific volume of working fluid both a. and b. none of the above
Answer Explanation

MCQs 11: Which loss does present in actual vapour power cycle at the exit of the boiler and at the entry of the turbine?

friction loss constant pressure heat loss both a. and b. none of the above
Answer Explanation

MCQs 12: How can we differentiate Rankine cycle from Carnot cycle?

Heat addition process of Rankine cycle is reversible isothermal whereas heat addition process of Carnot cycle is reversible isobaric Heat addition process of Rankine cycle is reversible isobaric whereas heat addition process of Carnot cycle is reversible isothermal Heat addition process of Rankine cycle is reversible isentropic whereas heat addition process of Carnot cycle is reversible isothermal both cycles are identical except the working fluid used
Answer Explanation

MCQs 13: How is the efficiency of the SI engine affected by change in specific heat ratio (γ) of the working fluid?

the efficiency of the engine increases with increase in specific heat ratio (γ) of the working fluid the efficiency of the engine decreases with increase in specific heat ratio (γ) of the working fluid the efficiency of the engine does not affected by change in specific heat ratio (γ) of the working fluid none of the above
Answer Explanation

MCQs 14: For the same capacity engines, the compression ratio of diesel engine

is lower than the compression ratio of SI engine is higher than the compression ratio of SI engine is same as the compression ratio of SI engine cannot say
Answer Explanation

MCQs 15: Rate of burning in the compression ignition engine can be controlled by

rate of injection of fuel rate of air taken into carburetor both a. and b. none of the above
Answer Explanation

MCQs 16: How is the heat added in the Diesel cycle?

reversibly at constant pressure irreversibly at constant pressure reversibly at constant volume irreversibly at constant volume
Answer Explanation

MCQs 17: The Brayton cycle which is used in aircraft, automotive is

a closed cycle an open cycle either closed or open cycle cannot say
Answer Explanation

MCQs 18: The heat required to melt 1 tonne of ice in 12 hours is equivalent to

one tonne of refrigeration two tonne of refrigeration half tonne of refrigeration four tonne of refrigeration
Answer Explanation

MCQs 19: One tonne of refrigeration is approximately equal to

3.5 kJ / min 3.5 W 211 kW 211 kJ / min
Answer Explanation

MCQs 20: What is the main reason behind subcooling of liquid refrigerant at the condenser outlet in vapour compression refrigeration system?

to increase the refrigerating effect to reduce the mass of vapour formed during expansion process to reduce vapour bubbles which obstruct the flow of liquid refrigerant all of the above
Answer Explanation

MCQs 21: What is the result of superheating of vapour at the evaporator outlet?

no liquid droplets will travel to the compressor the compressor discharge temperature increases both a. and b. none of the above
Answer Explanation

MCQs 22: Which expansion device is capable of regulating the flow of refrigerant according to the load on the evaporator?

capillary tube throttle valve both a. and b. none of the above
Answer Explanation

MCQs 23: Which compressor is used, when volume flow rate of refrigerant is very large?

rotary compressor reciprocating compressor centrifugal compressor none of the above
Answer Explanation

MCQs 24: What is the temperature at which the water vapour in the mixture of water vapour in air, starts condensing called?

condensation temperature dew point temperature vaporization temperature all of the above
Answer Explanation

MCQs 25: The temperature of air recorded by thermometer when the bulb is covered by a cotton wick saturated by water is called as

dry bulb temperature wet bulb temperature stream temperature psychrometric temperature
Answer Explanation

MCQs 26: Which temperature can be measured by an instrument called psychrometer?

dry bulb temperature wet bulb temperature both a. and b. none of the above
Answer Explanation

MCQs 27: What is the purpose of using economizer in the boiler?

to heat feedwater by utilizing heat from exhaust gases to heat feedwater by utilizing some heat from superheated steam to superheat steam none of the above
Answer Explanation

MCQs 28: Homogeneous system

consists any one phase among solid, liquid and gas consists only solid phase not liquid and gas consists all three phases at particular temperature none of the above
Answer Explanation

MCQs 29: Which of the following is chosen as a standard thermometric substance?

Gas Thermocouple Electric resistance Mercury
Answer Explanation

MCQs 30: Work done in a constant volume process is

negative zero positive none of the above
Answer Explanation

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