Steam Boilers, Engines, Nozzles and Turbines Practice Tests - Set 08

Practice Test: Question Set - 08

1. Presence of moisture in fuel oil would
    (A) Keep the burner tips cool
    (B) Aid in proper combustion
    (C) Because sputtering, possibly extinguishing flame
    (D) Clean the nozzles

2. In a steam condenser, the partial pressure of steam and air are 0.06 bar and 0.007 bar respectively. The condenser pressure is
    (A) 0.007 bar
    (B) 0.053 bar
    (C) 0.06 bar
    (D) 0.067 bar

3. Which is not correct statement about effect of sulphur in fuel?
    (A) It has heating value
    (B) It helps in electrostatic precipitation of ash in flue gases
    (C) It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low
    (D) It erodes furnace walls

4. The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be
    (A) 0.4
    (B) 0.56
    (C) 0.67
    (D) 1.67

5. A turbine is said to have an axial discharge when the steam leaves the blade tip at _________ to the direction of the blade motion.
    (A) 60°
    (B) 90°
    (C) 180°
    (D) 270°

6. The principal function of a stop valve is 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

7. Fire tube boilers are limited to a maximum design working pressure of
    (A) 1 kg/cm
    (B) 6 kg/cm
    (C) 17 kg/cm²
    (D) 100 kg/cm²

8. The critical pressure ratio (p₂/p₁) is given by
    (A) (p₂/p₁) = [2/(n - 1)] n/(n + 1)
    (B) (p₂/p₁) = [2/(n + 1)] n/(n-1)
    (C) (p₂/p₁) = [(n - 1)/2] n + (1/n)
    (D) (p₂/p₁) = [(n + 1)/2] n - (1/n)

9. Water tube boilers are
    (A) Internally fired
    (B) Externally fired
    (C) Internally as well as externally fired
    (D) None of these

10. The bituminous coal is no caking if its carbon content is
    (A) 78-81%
    (B) 81-85%
    (C) 85-90%
    (D) 90-95%

11. The flow through a nozzle is regarded as
    (A) Constant volume flow
    (B) Constant pressure flow
    (C) Isothermal flow
    (D) Isentropic flow

12. A device used to increase the temperature of saturated steam without raising its pressure, is called
    (A) Blow off cock
    (B) Fusible plug
    (C) Superheater
    (D) Stop valve

13. Orsat meter is used for
    (A) Gravimetric analysis of the flue gases
    (B) Volumetric analysis of the flue gases
    (C) Mass flow of the flue gases
    (D) Measuring smoke density of flue gases

14. The Parsons' reaction turbine has
    (A) Only moving blades
    (B) Only fixed blades
    (C) Identical fixed and moving blades
    (D) Fixed and moving blades of different shape

15. A single acting steam engine produces __________ power than that of double acting steam engine.
    (A) Equal
    (B) Half
    (C) Double
    (D) Four times

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