Steam Nozzles and Turbines Mechanical Engineering Questions - Set 27

Practice Test: Question Set - 27


1. While steam expands in turbines, theoretically the entropy
    (A) Remains constant
    (B) Increases
    (C) Decreases
    (D) Behaves unpredictably

2. A device used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit, is called
    (A) Blow off cock
    (B) Stop valve
    (C) Superheater
    (D) None of these

3. Water tube boilers are those in which
    (A) Flue gases pass through tubes and water around it
    (B) Water passes through the tubes and flue gases around it
    (C) Work is done during adiabatic expansion
    (D) Change in enthalpy

4. When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as
    (A) Internally fired boiler
    (B) Externally fired boiler
    (C) Natural circulation boiler
    (D) Forced circulation boiler

5. Duplex feed pumps are used in small steam boilers. These operate on the principle of
    (A) Centrifugal pump
    (B) Axial flow pump
    (C) Gear pump
    (D) Reciprocating pump

6. An economiser is installed in a boiler primarily to
    (A) Superheat the steam
    (B) Reduce fuel consumption
    (C) Increase steam pressure
    (D) All of these

7. Which type of boiler can meet rapid changes of load?
    (A) Vertical fire tube type
    (B) Horizontal fire tube type
    (C) Horizontal water tube type
    (D) Forced circulation type

8. Besides mean effective pressure, the data required to determine the indicated power of an engine include
    (A) Piston diameter, length of stroke and calorific value of fuel
    (B) Piston diameter, specific fuel consumption and Calorific value of fuel
    (C) Piston diameter, length of stroke and speed of rotation
    (D) Specific fuel consumption, speed of rotation and torque

9. The basic purpose of drum in boiler is to
    (A) Serve as storage of steam
    (B) Serve as storage of feed water for water wall
    (C) Remove salts from water
    (D) Separate steam from water

10. The high pressure and low pressure cylinders in a receiver 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

11. Steam in water tube boiler as compared to fire tube boiler
    (A) Can be raised rapidly
    (B) Is raised at slower rate
    (C) Is raised at same rate
    (D) Could be raised at fast/slow rate depending on design

12. When the speed of the engine is controlled by means of a valve in a steam pipe, which regulates the pressure of steam entering the engine, then the governing is known as
    (A) Throttle governing
    (B) Cut-off governing
    (C) By-pass governing
    (D) None of these

13. Proximate analysis of fuel is determination of percentage of
    (A) Carbon, hydrogen, nitrogen, sulphur, moisture
    (B) Fixed carbon, ash, volatile matter, moisture
    (C) Higher calorific value
    (D) Lower calorific value

14. A valve installed between the boiler and the feed pump is
    (A) Blow off cock
    (B) Feed check valve
    (C) Steam stop valve
    (D) None of these

15. Evaporative capacity of boiler is expressed as
    (A) kg of steam produced
    (B) Steam pressure produced
    (C) kg of fuel fired
    (D) kg of steam produced per kg of fuel fifed

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