A. Water alkalinity & leakage
B. Hydrazine addition during feed water treatment
C. Release of non-condensable gas from water in the boiler
D. Scale formation
Related Mcqs:
- The delivery pressure of boiler feed water pump compared to the boiler steam pressure is___________________?
A. Same
B. Slightly less
C. Slightly more
D. Much more - The bank of tubes located at the back of the domestic refrigerators are the _______________ tubes?
A. Refrigerant cooling
B. Evaporator
C. Condenser
D. Throttling - Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about _______________ percent ?
A. 1
B. 10
C. 30
D. 50 - In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that ?
A. Compared to the mass flow rate of cooling water, the rate of condensation of steam is
invariably smaller
B. Maintaining vacuum on tube side is more difficult than that on the shell side
C. Water velocity can be increased conveniently to increase the overall heat transfer co-efficient
because of its lower specific volume compared to steam
D. Condenser can act as a storage unit for condensed steam - Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are _______________ respectively ?
A. 70 & 30
B. 30 & 70
C. 50 & 50
D. 90 & 10 - Which of the following is a boiler accessory i.e., not a boiler mounting ?
A. Blow off cock
B. Feed check valve
C. Feed water pump
D. Stop valve - The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the ______________ of a boiler ?
A. Evaporative capacity
B. Evaporation efficiency
C. Thermal efficiency
D. Steam load - Induced draft fans provided in large thermal power plant boilers have __________________ blades?
A. Forward curved
B. Backward curved
C. Double curved
D. Radial or straight - Thermodynamic cycle involved in the working of a thermal power plant is the ______________ cycle ?
A. Joule
B. Carnot
C. Rankine
D. Brayton - A fire tube boiler is limited to a maximum steam pressure of about ______________ kg/cm2 ?
A. 6
B. 18
C. 38
D. 52
