Mechanical Engineering MCQs

A. heat carried away by flue gases
B. heat carried away by ash
C. mositure present in fuel and steam formed by combustion of hydrogen in fuel
D. radiation

A. Drooping characteristic
B. Linear characterisstic
C. Rising characteristic
D. Flat characteristic

A. 100°c
B. Above dew-point temperature of flue gases
C. Below dew-point temperature of flue gases
D. Less than wet bulb temperature of flue gases

A. From a metal wall from one medium to another
B. From heating an itermediate material and then heating the air from this material
C. By direct mixing ,
D. Heat is transferred by bleeding some gases from furnace

A. Create vacuum
B. Inject chemical solution in feed pump
C. Pump water, similar to boiler feed pump
D. Add make up water in the system

A. Approach temperature should be as low as possible
B. Handling and maintenance should be easier
C. Heat transfer area should be optimum
D. Stack gases should not be cooled to the dew point

A. The draft to be created
B. Limitation of construction facilities
C. Control of pollution
D. Quantity of flue gases to be handled

A. Chimney
B. Induced draft fan
C. Both combined a. and b.
D. Steam jet draught

A. More
B. Equal
C. Less
D. Could be more or less depending on the size of plant

A. Infinitely long
B. Around 200 meters
C. Equal to the height of the hot gas column producing draught
D. Outside temperature is very low