Steam Nozzles MCQ Practice Tests - Set 06

Practice Test: Question Set - 06


1. The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages.
    (A) Same
    (B) Less
    (C) More
    (D) None of these

2. The safety valve on boiler drum compared to safety valve on superheater is set at
    (A) Same value
    (B) Higher value
    (C) Lower value
    (D) Lower/higher depending on steam flow

3. Degree of reaction is defined as the ratio of
    (A) Heat drop in fixed blades to the heat drop in moving blades
    (B) Heat drop in moving blades to the heat drop in fixed blades
    (C) Heat drop in moving blades to the heat drop in fixed blades plus heat drop in moving blades
    (D) Heat drop in fixed blades plus heat drop in moving blades to the heat drop in moving blades

4. Which of the following statement is correct?
    (A) A horizontal steam engine requires less floor area than a vertical steam engine
    (B) The steam pressure in the cylinder is not allowed to fall below the atmospheric pressure
    (C) The compound steam engines are generally non-condensing steam engines
    (D) All of the above

5. A nozzle is said to be a convergent nozzle
    (A) When the cross-section of the nozzle increases continuously from entrance to exit
    (B) When the cross-section of the nozzle decreases continuously from entrance to exit
    (C) When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
    (D) None of the above

6. Which of the following statement is wrong?
    (A) Locomotive boiler is a water tube boiler
    (B) Water tube boilers are internally fired
    (C) Lamont boiler is a low pressure water tube boiler
    (D) All of the above

7. Film boiling occurs at
    (A) Very low pressure
    (B) Atmospheric pressures
    (C) Medium pressures
    (D) Very high pressures

8. The discharge is __________ at critical pressure.
    (A) Zero
    (B) Minimum
    (C) Maximum
    (D) None of these

9. An air preheater is installed
    (A) Before the economiser
    (B) Before the superheater
    (C) Between the economiser and chimney
    (D) None of these

10. Coke is produced by
    (A) Pulverizing coal in inert atmosphere
    (B) Heating wood in a limited supply of air at temperatures below 300°C
    (C) Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
    (D) Enriching carbon in the coal

11. The variation of steam pressure in the nozzle depends upon
    (A) Velocity of steam
    (B) Specific volume of steam
    (C) Dryness fraction of steam
    (D) All of these

12. A safety valve mainly used with locomotive and marine boilers is
    (A) Lever safety valve
    (B) Dead weight safety valve
    (C) High steam and low water safety valve
    (D) Spring loaded safety valve

13. In a throttling process
    (A) Steam temperature remains constant
    (B) Steam pressure remains constant
    (C) Steam enthalpy remains constant
    (D) Steam entropy remains constant

14. De-Laval turbine is a
    (A) Simple impulse turbine
    (B) Simple reaction turbine
    (C) Impulse-reaction turbine
    (D) None of these

15. When steam after doing work in the cylinder passes into a condenser, the engine is said to be a
    (A) Slow speed engine
    (B) Vertical steam engine
    (C) Condensing steam engine
    (D) Non-condensing steam engine

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