Steam Boilers MCQs with Answers - Set 24 - ObjectiveBooks

Steam Boilers MCQs with Answers - Set 24

Practice Test: Question Set - 24

1. Green coal, in order to be burnt, must be
    (A) Heated sufficiently
    (B) Burnt in excess air
    (C) Heated to its ignition point
    (D) Burnt as powder

2. A safety valve usually employed with stationary boilers is
    (A) Lever safety valve
    (B) Dead weight safety valve
    (C) High steam and low water safety valve
    (D) All of these

3. The relative heat absorption for successively added equal areas of boiler convection heating surfaces
    (A) Increases
    (B) Decreases
    (C) Remain unaffected
    (D) First increases and then decreases

4. The pressure of steam in the engine cylinder at the beginning of the stroke is ________ the boiler pressure.
    (A) Equal to
    (B) Less than
    (C) Higher than
    (D) None of these

5. Adiabatic process is
    (A) Essentially an isentropic process
    (B) Non-heat transfer process
    (C) Reversible process
    (D) Constant temperature process

6. Lancashire boiler is
    (A) Stationary fire tube boiler
    (B) Internally fired boiler
    (C) Horizontal boiler
    (D) All of these

7. Cochran boiler is a
    (A) Horizontal fire tube boiler
    (B) Horizontal water tube boiler
    (C) Vertical water tube boiler
    (D) Vertical fire tube boiler

8. Blow off cock in a boiler is used to
    (A) Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
    (B) Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
    (C) Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
    (D) Increase the temperature of saturated steam without raising its pressure

9. The diameter of internal flue tubes in a Lancashire boiler compared to its shell is
    (A) One-half
    (B) One-third
    (C) Two-fourth
    (D) Two-fifth

10. When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, then the boiler is known as
    (A) Internally fired boiler
    (B) Externally fired boiler
    (C) Natural circulation boiler
    (D) Forced circulation boiler

11. Thermal efficiency of a thermal power plant is of the order of
    (A) 15 %
    (B) 20 %
    (C) 30 %
    (D) 45 %

12. The high steam and low water safety valve is not used in
    (A) Cochran boiler
    (B) Cornish boiler
    (C) Lancashire boiler
    (D) Locomotive boiler

13. Expanding steam to a very low pressure (high vacuum) in steam engines is
    (A) Desirable
    (B) Economical
    (C) Essential
    (D) Uneconomical

14. The cylinder dimensions of a compound engine may be designed on the basis of
    (A) Equal power developed in each cylinder for uniform turning moment
    (B) Equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders
    (C) Equal temperature drop in each cylinder for economy of steam
    (D) All of the above

15. One kilowatt-hour energy is equivalent to
    (A) 1000 J
    (B) 360 kJ
    (C) 3600 kJ
    (D) 3600 kW/sec

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