Practice Test: Question Set - 25
1. Which of the following boiler is best suited to meet the fluctuating demand of steam?
- (A) Locomotive
boiler
- (B) Lancashire
boiler
- (C) Cornish
boiler
- (D) Babcock
and Wilcox boiler
2. In locomotive boiler, maximum steam pressure is limited to
- (A) 1 kg/cm²
- (B) 5 kg/cm²
- (C) 10 kg/cm²
- (D) 18 kg/cm²
3. The fire tubes in a Cochran boiler usually have _________ diameter.
- (A) 6.25 mm
- (B) 62.5 mm
- (C) 72.5 mm
- (D) 92.5 mm
4. Boiler stays are used to
- (A) Prevent flat surfaces
under pressure from tearing apart
- (B) Take care of failure
in shear
- (C) Take care of failure
in compression
- (D) Provide support for
boiler
5. Which of the following is required for a steam condensing plant?
- (A) Condenser
- (B) Condensate
pump
- (C) Air
extraction pump
- (D) All
of these
6. Spontaneous combustion is a phenomenon in which
- (A) All the fuel burns instantaneously
producing high energy release
- (B) Fuel burns with less
air
- (C) Coal bursts into
flame without any external ignition source but by itself due to gradual
increase in temperature as a result of heat released by combination of oxygen
with coal
- (D) Explosion in furnace
7. Fire tube boilers are limited to a maximum working pressure of
- (A) 0.17 MN/m²
- (B) 1.7 MN/m²
- (C) 17 MN/m²
- (D) 170 MN/m²
8. Tertiary air is the air used to
- (A) Provide air around
burners for obtaining optimum combustion
- (B) Transport and dry the coal
- (C) Cool the scanners
- (D) Convert CO (formed in lower zone of
furnace) into CO₂ at higher zone
9. Desecration of feed water is carried out because it reduces
- (A) Cavitation of boiler
feed pumps
- (B) Corrosion caused by
oxygen
- (C) Heat transfer
coefficient
- (D) pH value of water
10. The function of a safety valve is
- (A) To
blow off steam when the pressure of steam inside the boiler exceeds the working
pressure
- (B) To
indicate the water level inside the boiler to an observer
- (C) To
measure pressure of steam inside the steam boiler
- (D) None
of the above
11. In a Woolf type compound engine, the high pressure and low pressure cylinders
- (A) Have
common piston rod
- (B) Are
set at 90°
- (C) Have
separate piston rod
- (D) Are
set in V arrangement
12. Carbonization of coal is the process of
- (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) Binding the pulverized coal into briquettes
13. Cut-off ratio is the ratio of
- (A) Swept volume
to the volume at cut-off
- (B) Volume
at cut-off to the clearance volume
- (C) Volume
at cut-off to the swept volume
- (D) Clearance
volume to the volume at cut-off
14. The pressure at which latent heat of vaporisation of water is zero, is
- (A) Below atmospheric
pressure
- (B) 1 kg/cm²
- (C) 100 kg/cm²
- (D) 225.6 kg/cm²
15. A compound steam engine in which piston rods of high pressure and low pressure cylinders ' are attached to two different cranks set at 180° to each other, is called
- (A) Receiver
type compound engine
- (B) Tandem
type compound engine
- (C) Woolf
type compound engine
- (D) Both
(A) and (B)