Multiple Choice Questions on Steam Turbines and Nozzles - Set 22

Practice Test: Question Set - 22


1. The diameter of Cornish boiler is of the order of
    (A) 12 m
    (B) 1.52.5 m
    (C) 23 m
    (D) 2.53.5 m

2. The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency)
    (A) ηS = ηB × ηN
    (B) ηS = ηB / ηN
    (C) ηS = ηN / ηB
    (D) None of these

3. The high pressure and low pressure cylinders in a Tandem type compound engine are regarded as having cranks
    (A) 180° to each other
    (B) 90° to each other
    (C) 0° to each other
    (D) None of these

4. The water tubes in a Babcock and Wilcox boiler are
    (A) Horizontal
    (B) Vertical
    (C) Inclined
    (D) Horizontal and inclined

5. In an impulse turbine, steam expands
    (A) Wholly in blades
    (B) Wholly in nozzle
    (C) Partly in the nozzle and partly in blades
    (D) None of these

6. There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called
    (A) Wet steam
    (B) Saturated steam
    (C) Superheated steam
    (D) Cushion steam

7. In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine
    (A) Lancashire boiler
    (B) Locomotive boiler
    (C) Babcock and Wilcox boiler
    (D) Benson boiler

8. De-Laval turbine is a
    (A) Single rotor impulse turbine
    (B) Multi-rotor impulse turbine
    (C) Impulse reaction turbine
    (D) None of these

9. An air preheater
    (A) Increases evaporative capacity of the boiler
    (B) Increases the efficiency of the boiler
    (C) Enables low grade fuel to be burnt
    (D) All of the above

10. O₂ content in atmospheric air on weight basis is
    (A) 21 %
    (B) 23 %
    (C) 30 %
    (D) 40 %

11. Rateau turbine is
    (A) Simple reaction turbine
    (B) Velocity compounded turbine
    (C) Pressure compounded turbine
    (D) Pressure-velocity compounded turbine

12. The function of a valve rod is
    (A) To provide reciprocating motion to the slide valve
    (B) To convert reciprocating motion of the piston into rotary motion of the crank
    (C) To convert rotary motion of the crankshaft into to and fro motion of the valve rod
    (D) To provide simple harmonic motion to the D-slide valve

13. The condition of steam in boiler drum is always
    (A) Dry
    (B) Wet
    (C) Saturated
    (D) Supersaturated

14. The density of supersaturated steam is about __________ that of the ordinary saturated vapor at the corresponding pressure.
    (A) Same as
    (B) 2 times
    (C) 4 times
    (D) 8 times

15. The missing quantity per stroke is equal to
    (A) Cylinder feed indicated mass of steam
    (B) Cylinder feed + indicated mass of steam
    (C) Mass of cushion steam + indicated mass of steam
    (D) Mass of cushion steam + cylinder feed

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