21
The economiser is used in boilers to
A)
Increase thermal efficiency of boiler
B)
Economize on fuel
C)
Extract heat from the exhaust flue gases
D)
Increase flue gas temperature
Answer & Solution
Answer: Option
A
22
The safety valve at superheater as compared to drum safety valve setting is set at
A)
Higher value
B)
Lower value
C)
Same value
D)
Any value
Answer & Solution
Answer: Option
B
23
Lancashire boiler is a
A)
Stationary fire tube boiler
B)
Stationary water tube boiler
C)
Water tube boiler with natural/forced circulation
D)
Mobile fire tube boiler
Answer & Solution
Answer: Option
A
24
The proximate analysis of fuel lists
A)
Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume
B)
Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight
C)
Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash
D)
Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
Answer & Solution
Answer: Option
D
25
The ultimate analysis of fuel lists
A)
Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume
B)
Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight
C)
Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash
D)
Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
Answer & Solution
Answer: Option
B
26
Which of the following compound steam engine requires a smaller flywheel?
A)
Receiver type
B)
Tandem type
C)
Woolf type
D)
All of these
Answer & Solution
Answer: Option
A
27
In case of condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the atmospheric pressure.
A)
Equal to
B)
Lower than
C)
Higher than
D)
None of these
Answer & Solution
Answer: Option
C
28
Latent heat of dry steam at atmospheric pressure is equal to
A)
539 kcal/kg
B)
539 BTU/lb
C)
427 kcal/kg
D)
100 kcal/kg
Answer & Solution
Answer: Option
A
29
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
Answer & Solution
Answer: Option
A
30
In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine
A)
Lancashire boiler
B)
Locomotive boiler
C)
Babcock and Wilcox boiler
D)
Benson boiler
Answer & Solution
Answer: Option
B
