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MCQs 1: Absolute pressure is measured as

Gauge pressure – Atmospheric pressure Gauge pressure + Atmospheric pressure Gauge pressure / Atmospheric pressure none of the above
Answer Explanation

MCQs 2: A platinum resistance thermometer has a resistance of 2 ohm at 0° C and 3 ohm at 100° C. What will be the temperature when resistance indicates 5 ohm?

300° C 200° C 350° C 400° C
Answer Explanation

MCQs 3: Heat flow is a quantity of heat transfer

within definite time within definite cross-sectional area within definite volume of the system none of the above
Answer Explanation

MCQs 4: The process in which no heat transfer takes place through boundaries is called as

isothermal process adiabatic process isochoric process none of the above
Answer Explanation

MCQs 5: Heat transfer is

a point function a path function a transfer function none of the above
Answer Explanation

MCQs 6: The amount of heat required to raise a unit mass of substance through a unit rise in temperature is called as

heat capacity of a substance specific heat of a substance latent heat of a substance none of the above
Answer Explanation

MCQs 7: The amount of heat transferred to convert unit mass of solid to vapour or vice versa is called as

latent heat of vaporization latent heat of fusion latent heat of sublimation specific heat
Answer Explanation

MCQs 8: Which among the following statements are correct? (1) Energy is an extensive property (2) Specific energy is an extensive property (3) Energy is a point function (4) Heat capacity is an extensive property

Statement (1), (2) and (3) Statement (1), (3) and (4) Statement (2), (3) and (4) Statement (1), (2), (3) and (4)
Answer Explanation

MCQs 9: A quasi-static process has main characteristics as it is

a stationary process an infinitely slow process a random process a spontaneous process
Answer Explanation

MCQs 10: A cyclic heat engine operates between a source temperature of 927 °C and a sink temperature of 27 °C. What will be the maximum efficiency of the heat engine?

100 % 80 % 75 % 70 %
Answer Explanation

MCQs 11: PMM2 is the machine which violates ___________

Kelvin-Planck statement Clausius statement both a. and b. none of the above
Answer Explanation

MCQs 12: Exergy is not conserved but destroyed in the process. What is the reason behind this?

reversibility irreversibility both reversibility and irreversibility none of the above
Answer Explanation

MCQs 13: What does the exergy principle state?

The exergy of an isolated system can never decreases, but always increases The exergy of an isolated system can never increases, but always decreases The exergy of an isolated system can either increases or decreases cannot say
Answer Explanation

MCQs 14: People use electric energy to heat and light homes. What does it indicate?

People are destroying energy People are creating energy People are converting energy from more exergy value to less exergy value People are converting energy from less exergy value to more exergy value
Answer Explanation

MCQs 15: The ratio of minimum exergy which must be consumed to perform the task to the actual amount of energy consumed in performing the same task is called as

first law efficiency second law efficiency exergy efficiency none of the above
Answer Explanation

MCQs 16: The dryness (x) fraction of superheated steam is taken as

x= 0 x= 0.9 x= 0.999 x= 1
Answer Explanation

MCQs 17: What is a liquid, whose temperature is less than the saturation temperature at the given pressure, called?

compressed liquid subcooled liquid both a. and b. none of the above
Answer Explanation

MCQs 18: What is the degree of subcooling?

the difference between saturation temperature of liquid and actual temperature of liquid the difference between saturation temperature of vapour and actual temperature of liquid the difference between saturation temperature of liquid and actual temperature of vapour the difference between saturation temperature of vapour and actual temperature of vapour
Answer Explanation

MCQs 19: Dalton's law of partial pressure states that

the total pressure of a mixture of ideal gases is equal to the sum of the partial pressures of individual gases divided by number of gases mixed the total pressure of a mixture of ideal gases is equal to the partial pressure of any individual gas in the mixture the total pressure of a mixture of ideal gases is equal to the sum of the partial pressures of individual gases none of the above
Answer Explanation

MCQs 20: What is the partial volume of a gas in a mixture?

volume occupied by a single gas alone of a mixture at the same temperature and pressure of the mixture total volume of the mixture at a certain pressure and temperature divided number of gases mixed in the mixture both a. and b. none of the above
Answer Explanation

MCQs 21: The sum of partial volumes of all gases in a mixture is equal to

less than the total volume of the mixture the total volume of the mixture more than the total volume of the mixture cannot predict
Answer Explanation

MCQs 22: How is the COP of gas-refrigeration cycle compared with the COP of vapour compression cycle, for the same capacity?

the COP of gas-refrigeration cycle is lower than the COP of vapour compression cycle, for the same capacity the COP of gas-refrigeration cycle is higher than the COP of vapour compression cycle, for the same capacity the COP of gas-refrigeration cycle is same as the COP of vapour compression cycle none of the above
Answer Explanation

MCQs 23: The gas-refrigeration system is

more heavy and bulky than the vapour compression cycle less heavy and bulky than the vapour compression cycle same in construction with the vapour compression cycle none of the above
Answer Explanation

MCQs 24: What is the perfect condition for dehumidification of air?

air is heated above its dew point temperature air is cooled up to its dew point temperature air is heated below its dew point temperature air is cooled below its dew point temperature
Answer Explanation

MCQs 25: At 100% relative humidity, the wet bulb temperature is

lower than the dew point temperature higher than the dew point temperature equal to the dew point temperature none of the above
Answer Explanation

MCQs 26: The dew point temperature is less than the wet bulb temperature for

saturated air unsaturated air both saturated and unsaturated air none of the above
Answer Explanation

MCQs 27: When the rate of evaporation of water is zero, the relative humidity of the air is

0% 100% 50% unpredictable
Answer Explanation

MCQs 28: What is the pH value of water permissible for boiler?

0 7 slightly less than 7 slightly more than 7
Answer Explanation

MCQs 29: The formation of scale boiler leads to

decrease in efficiency of boiler increase in efficiency of boiler increase in heat transfer decrease in maintenance of boiler
Answer Explanation

MCQs 30: The unit of mass in S.I. units is ____________________?

kilogram gram tonne quintal newton
Answer Explanation

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