Multiple Choice Questions on Steam Engines and Turbines - Set 18

Practice Test: Question Set - 18


1. Latent heat of dry steam at atmospheric pressure is equal to
    (A) 539 kcal/ kg
    (B) 539 BTU/ lb
    (C) 427 kcal/ kg
    (D) 100 kcal/ kg

2. The ratio of total useful heat drop to the total isentropic heat drop, is called
    (A) Stage efficiency
    (B) Internal efficiency
    (C) Rankine efficiency
    (D) None of these

3. The pressure of feed water has to be raised before its entry into the boiler. The pressure is raised by a device known as
    (A) Feed pump
    (B) Injector
    (C) Feed check valve
    (D) Pressure gauge

4. For burning 1 kg of carbon to CO as per chemically correct combustion, amount of air required is
    (A) 1 kg
    (B) 4/3 kg
    (C) 8/3 kg
    (D) 2 kg

5. A binary vapor plant consists of
    (A) Steam turbine
    (B) Steam condenser
    (C) Mercury boiler
    (D) All of these

6. The draught may be produced by a
    (A) Mechanical fan
    (B) Chimney
    (C) A steam jet
    (D) All of these

7. Which of the following is steam dial?
    (A) Non-coking bituminous coal
    (B) Brown coal
    (C) Pulverized coal
    (D) Coking bituminous coal

8. The maximum efficiency of a reaction turbine is
    (A) 2 sin²α/(1 + sin²α)
    (B) 2 cos²α/(1 + cos²α)
    (C) (1 + sin²α)/2 sin²α
    (D) (1 + cos²α)/2 cos²α

9. In order to compare the capacity of boilers, the feed water temperature and working pressure are taken as
    (A) 50°C and normal atmospheric pressure
    (B) 50°C and 1.1 bar pressure
    (C) 100°C and normal atmospheric pressure
    (D) 100°C and 1.1 bar pressure

10. In accelerated circulation type boiler
    (A) Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
    (B) Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
    (C) Feed pump is employed to supplement natural circulation in water wall type furnace
    (D) Water is converted into steam in one pass without any recirculation

11. The pressure of steam __________ while flowing through a nozzle.
    (A) Increases
    (B) Decreases
    (C) Remains constant
    (D) None of these

12. The indicated thermal efficiency is defined as the
    (A) Ratio of thermal efficiency to the Rankine efficiency
    (B) Ratio of brake power to the indicated power
    (C) Ratio of heat equivalent to indicated power to the energy supplied in steam
    (D) Product of thermal efficiency and Rankine efficiency

13. The major axis of elliptical manholes on the shell should be provided
    (A) Longitudinally
    (B) Circumferentially
    (C) On dished end
    (D) Anywhere

14. In a reaction turbine, when steam flows through the moving blades,
    (A) Pressure increases while velocity decreases
    (B) Pressure decreases while velocity increases
    (C) Pressure and velocity both decreases
    (D) Pressure and velocity both increases

15. The device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called
    (A) Safety valve
    (B) Water level indicator
    (C) Pressure gauge
    (D) Fusible plug

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