Question56:-Which of the following is the best way to assess boiler losses ?
A:-Benchmarking evaporation ratio
B:-Indirect efficiency evaluation
C:-Direct efficiency evaluation
D:-None of the above
Correct Answer:- Option-B

Question57:-A boiler trial indicated 2% O2 at boiler exit and 7% O2 at stack. The in-leak air quanity between these two
measurement is

A:-25%
B:-50'
0:-40'
D:-5%
Correct Answer:- Option-C
Question58:-Enthalpy of evaporation of steam will be higher at
A:-2 kg/*cm*(2)°
B:-8 kg/*cm*(2)°
C:-12 kg/*cm*(2)°
D:-20 kg/*cm*(2)°
Correct Answer:- Option-A
Question59:-The element that does not contribute to heating value during combustion process is
A:-Sulphur
B:-Hydrogen
:-Carbon
D:-Nitrogen
Correct Answer:- Option-D
Question60:-Which of the following is not one of the 3 T's of combustion ?
A:-Time
B:-Temperature
C:-Turbulence
D:-Tertiary
Correct Answer:- Option-D
Question61:-Which of the following is not required in the boiler efficiency evaluation by direct method ?
A:-Steam flow
-Fuel flow
C:-Oxygen % in the flue gas
D:-Feed water temperature
Correct Answer:- Option-C
Question62:-The dry saturated steam when throttled to a lower pressure will
A:-Become wet
B:-Become superheated
C:-Remain dry saturated
D:-Become condensate
Correct Answer:- Option-B
Question63:-Velocity of steam in a pipe does strongly depend on
A:-Number of bends and valves in the pipe
B:-Specific volume of steam
C:-Length of the pipe
D:-None of the above
Correct Answer:- Option-B
Question64:-Latent heat of steam at the critical point is
A:-Zero
-540 kCal/kg
C:-Infinite
D:-Equal to sensible heat
Correct Answer:- Option-A

Question65:-Furnace oil contains 84% carbon by weight. How many kg of *CO_(2)° does complete combustion of 1 kg of
furnace oil generate ?

432.4

B:-4

%
946