Q1. At which pressure the properties of water and steam become identical
(A) 0.1 kg/cm2
(B) 1 kg/cm2
(C) 100 kg/cm2
(D) 225.6 kg/cm2

Q2. In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is
(A) 0.4
(B) 0.55
(C) 0.5
(D) 0.8

Q3. While steam expands in turbines, theoretically the entropy
(A) remains constant
(B) increases
(C) decreases
(D) behaves unpredictably

Q4. Heating wet steam at constant temperature is heating it at constant
(A) volume
(B) pressure
(C) entropy
(D) enthalpy

(A) essentially an isentropic process
(B) non-heat transfer process
(C) reversible process
(D) constant temperature process

Q6. The state of vapour under saturation condition is described by
(A) pressure alone
(B) temperature alone
(C) pressure and temperature
(D) pressure and dryness fraction

Q7. Pick up the wrong statement about critical condition of steam
(A) latent heat is zero
(B) liquid directly becomes steam
(C) specific volume of steam and liquid is same
(D) this is the maximum pressure limit

Q8. Water boils when its vapour pressure
(A) equals that of the surroundings
(B) equals 760 mm of mercury
(C) equals to atmospheric pressure
(D) equals the pressure of water in the container

Q9. Equivalent evaporation of water is the evaporation “for a feed water supply at 100°C
(A) and its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm2
(B) and its corresponding conversion into dry steam at desired boiler pressure
(C) conversion into steam at atmospheric condition
(D) conversion into steam at the same pres-sure at which feed water is supplied

Q10. The evaporation of 15.653 kg of water per hour from and at 100°C is called
(A) factor of evaporation
(B) equivalent evaporation
(C) one boiler h.p.
(D) boiler efficiency

Q11. The increase in pressure
(A) lowers the boiling point of a liquid
(B) raises the boiling point of a liquid
(C) .does not affect the boiling point of a liquid
(D) reduces its volume

Q12. During polytropic process
(A) heat transfer takes place across cylinder walls
(B) work is done
(C) steam may be wet, dry or superheated after expansion
(D) all of the above

Q13. Hygrometery deals with the
(A) Hygroscopic substances
(B) water vapour in air
(C) temperature of air
(D) pressure of air

Q14. Orsat meter is used for
(A) gravimetric analysis of the flue gases
(B) volumetric analysis of the flue gases
(C) mass flow of the flue gases
(D) measuring smoke density of flue gases

Q15. An ideal regenerative cycle is
(A) equal to carnot cycle
(B) less than carnot cycle
(C) more than carnot cycle
(D) could be anything

Q16. Efficiency of rankine cycle can be increased by
(A) decreasing initial steam pressure and temperature
(B) increasing exhaust pressure
(C) decreasing exhaust pressure
(D) increasing the expansion ratio

Q17. Cochran boiler is a
(A) horizontal fire-tube boiler
(B) horizontal water-tube boiler
(C) vertical fire tube boiler
(D) forced circulating boiler

Q18. Lancashire boiler is a
(A) stationary fire tube boiler
(B) stationary water tube boiler
(C) water tube boiler with natural/forced circulation
(D) mobile fire tube boiler

Q19. Efficiency of a thermal cycle increases by
(A) regeneration
(B) reheating of steam
(C) Both of these
(D) None of these

Q20. One kilowatt-hour energy is equivalent to
(A) 1200 J
(B) 360 kJ
(C) 3600 kJ
(D) 3600 kW/sec

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