Multiple Choice Questions on Steam Turbines and Boilers - Set 20

Practice Test: Question Set - 20


1. Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to
    (A) 421 kg.m
    (B) 421 kg.m
    (C) 539 kg.m
    (D) 102 kg.m

2. The effect of super-saturation is that the
    (A) Mass of the steam discharged increases
    (B) Entropy and specific volume of the steam increases
    (C) Exit velocity of steam reduces
    (D) All of these

3. The diameter of superheated tubes in a locomotive boiler is
    (A) 13 mm
    (B) 31 mm
    (C) 130 mm
    (D) 230 mm

4. The change in internal energy in steam engines equals to
    (A) Work done during the Rankine cycle 
    (B) Work done during compression
    (C) Work done during adiabatic expansion
    (D) Change in enthalpy

5. The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ numbers of stages are required.
    (A) More
    (B) Less
    (C) Equal
    (D) None of these

6. In fire tube boilers
    (A) Water passes through the tubes which are surrounded by flames and hot gases
    (B) The flames and hot gases pass through the tubes which are surrounded by water
    (C) Forced circulation takes place
    (D) None of these

7. The shell diameter and length of locomotive boiler are
    (A) 1.5 m, 4 m
    (B) 1.5 m, 6 m
    (C) 1 m, 4 m
    (D) 2 m, 4 m

8. The ratio of the workdone on the blades to the energy supplied to the blades, is called
    (A) Blading efficiency
    (B) Nozzle efficiency
    (C) Gross or stage efficiency
    (D) Mechanical efficiency

9. The numbers of fire tubes in a Cochran boiler are
    (A) 75
    (B) 115
    (C) 165
    (D) 225

10. In forced 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 critical pressure ratio for initially dry saturated steam is
    (A) 0.546
    (B) 0.577
    (C) 0.582
    (D) 0.601

12. In cross compounding, the cylinders are arranged
    (A) Side by side and each cylinder has common piston, connecting rod and crank
    (B) Side by side and each cylinder has separate piston, connecting rod and crank
    (C) At 90° and each cylinder has common piston, connecting rod and crank
    (D) At 90° and each cylinder has separate piston, connecting rod and crank

13. Vacuum for reciprocating steam engines compared to steam turbines is
    (A) More
    (B) Equal
    (C) Less
    (D) Could be more or less depending on the size of plant

14. In a nozzle, the effect of super-saturation is to
    (A) Decrease dryness fraction of steam
    (B) Decrease specific volume of steam
    (C) Increase the entropy
    (D) Increase the heat drop

15. The cylindrical shell of a Lancashire boiler has diameter from
    (A) 1 to 2 m
    (B) 1.25 to 2.25 m
    (C) 1.5 to 2.5 m
    (D) 1.75 to 2.75 m

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