Objective Questions on Boiler Mountings and Accessories
1-The amount of air required for complete combustion of fuel is called:
(A) Excess air
(B) Free air
(C) Stoichiometric air
(D) None of the above
2-C+O2 → CO2, Therefore 1kg of carbon requires how much kg of oxygen?
(A) 1.67
(B) 2.67
(C) 3.67
(D) 4.67
3-Mechanical equivalent of heat is related to:
(A) Conservation of mass
(B) Conservation of energy
(C) Conservation of momentum
(D) None of the above
4-The localized corrosion caused by oxygen in boilers is called:
(A) Scaling
(B) Pitting
(C) Erosion
(D) None of the above
5-Which of the following equipment is used for boiling water treatment?
(A) Pyrometer
(B) Dearater
(C) Hydrometer
(D) None of the above
6-What is the recommended hardness of boiler feed water?
(A) Less than 5 ppm
(B) Greater than 5 ppm
(C) Greater than 1 ppm
(D) Less than 1 ppm
7-If steam water content is 5%, its dryness fraction is:
(A) 95%
(B) 0%
(C) 5%
(D) None of these
8-The energy content of steam is called:
(A) Entropy
(B) Density
(C) Specific volume
(D) Enthalpy
9-Only throttling calorimeter is used for measuring:
(A) Very low dryness fraction upto 0.7
(B) Very high dryness fraction upto 0.98
(C) Dryness fraction of only low pressure steam
(D) Dryness fraction of only high pressure steam
10-Air at 20°C and 101.325 kpa is called:
(A) STP
(B) NTP
(C) ISA
(D) SATP
ANSWERS:
1-(D), 2-(B), 3-(B), 4-(B), 5-(B), 6-(D), 7-(A), 8-(D), 9-(B), 10-(B)