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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