Steam Boilers, Engines, Nozzles and Turbines Practice Test - Set 02

Practice Test: Question Set - 02

1. In a reaction turbine when the degree of reaction is zero, then there is
    (A) No heat drop in moving blades
    (B) No heat drop in fixed blades
    (C) Maximum heat drop in moving blades
    (D) Maximum heat drop in fixed blades

2. A vessel into which the steam is exhausted and condensed after doing work in an engine cylinder or turbine is known as
    (A) Steam condenser
    (B) Steam boiler
    (C) Steam preheater
    (D) Economiser

3. The capacity of induced draft fan compared to forced draft fan in a boiler is
    (A) Same
    (B) More
    (C) Less
    (D) Less or more depending on size of boiler

4. The expansion of steam in a nozzle follows
    (A) Carnot cycle
    (B) Rankine cycle
    (C) Joule cycle
    (D) Stirling cycle

5. Which of the following compound steam engine requires a smaller flywheel?
    (A) Receiver type
    (B) Tandem type
    (C) Woolf type
    (D) All of these

6. The feed check valve is used in order to
    (A) Regulate flow of boiler water
    (B) Check level of water in boiler drum
    (C) Recirculate unwanted feed water
    (D) Allow high pressure feed water to flow to drum and not allow reverse flow to take place

7. The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)
    (A) Remains constant
    (B) Decreases
    (C) Increases
    (D) None of these

8. An economiser _________ the steam raising capacity of a boiler.
    (A) Increases
    (B) Decreases
    (C) Has no effect on
    (D) None of these

9. 1 kg.m is equal to
    (A) 9.81 Joules
    (B) 102 Joules
    (C) 427 Joules
    (D) None of these

10. When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be
    (A) Choked
    (B) Under-damping
    (C) Over-damping
    (D) None of these

11. The aim of a compound steam engine is
    (A) To reduce the ratio of expansion in each cylinder
    (B) To reduce the length of stroke
    (C) To reduce the temperature range in each cylinder
    (D) All of the above

12. At critical point, i.e. p=225.65 kg/cm², the latent enthalpy of vaporisation is
    (A) Maximum
    (B) Minimum
    (C) Zero
    (D) Depends on temperature also

13. Parson's reaction turbine is a __________ reaction turbine.
    (A) 40 percent
    (B) 50 percent
    (C) 60 percent
    (D) 70 percent

14. A compound steam engine in which the high pressure and low pressure cylinders have common piston rod, is called
    (A) Receiver type compound engine
    (B) Tandem type compound engine
    (C) Woolf type compound engine
    (D) None of these

15. 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

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