Steam Turbines MCQs with Answers - Set 23

Practice Test: Question Set - 23


1. The saturation temperature of steam with increase in pressure increases
    (A) Linearly
    (B) Rapidly first and then slowly
    (C) Slowly first and then rapidly
    (D) Inversely

2. Thermal equilibrium means that the flow of steam is
    (A) Isothermal
    (B) Isentropic
    (C) Hyperbolic
    (D) Polytropic

3. Willian’s line follows the law (where b = A constant representing the shape of the Willian’s line, a = Another constant i.e. no load consumption per hour, I.P. = Indicated power, and m = Steam consumption per hour)
    (A) I.P. = a × m + b
    (B) m = a + b × I.P.
    (C) I.P. = b × m + a
    (D) m = (b/I.P.) - a

4. 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 pressure at which feed water is supplied

5. The difference of supersaturated temperature and saturation temperature at that pressure is called
    (A) Degree of super-saturation
    (B) Degree of superheat
    (C) Degree of under-cooling
    (D) None of these

6. The diameter of internal flue tubes of a Lancashire boiler is about _________ that of its shell.
    (A) One-fourth
    (B) One-third
    (C) Two-fifth
    (D) One-half

7. The biggest size of thermal power unit operating in India is
    (A) 30 MW
    (B) 60 MW
    (C) 100 MW
    (D) 500 MW

8. The ratio of the isentropic heat drop to the heat supplied, is called
    (A) Reheat factor
    (B) Stage efficiency
    (C) Internal efficiency
    (D) Rankine efficiency

9. The ratio of the actual vacuum to the ideal vacuum in a condenser is called
    (A) Condenser efficiency
    (B) Vacuum efficiency
    (C) Nozzle efficiency
    (D) Boiler efficiency

10. Pick up the wrong statement about water tube boiler in comparison to fire tube boilers
    (A) Former occupies less space for same power
    (B) Rate of steam flow is more in former case
    (C) Former is used for high installed capacity
    (D) Chances of explosion are less in former case

11. The turbine blades are
    (A) Straight
    (B) Circular
    (C) Curved
    (D) None of these

12. The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called
    (A) Condenser efficiency
    (B) Vacuum efficiency
    (C) Nozzle efficiency
    (D) Boiler efficiency

13. The heat loss in a boiler takes place in the form of
    (A) Heat carried away by flue gases
    (B) Heat carried away by ash
    (C) Moisture present in fuel and steam formed by combustion of hydrogen in fuel
    (D) All of the above

14. Steam exhaust from high pressure turbine is reheated in
    (A) Boiler drums
    (B) Superheater tubes
    (C) Economizer
    (D) A separate coil located in convection path

15. The value of diagram factor depends upon
    (A) Initial conditions of steam
    (B) Back pressure
    (C) Initial pressure of steam
    (D) All of these

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