A. 250
B. 650
C. 850
D. 1000
Related Mcqs:
- Ceramic recuperators compared to metallic recuperators for the same duty_________________?
A. Are lighter
B. Occupy more space
C. Are less costly
D. Have higher pressure differential between flue gas & air side - Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C ?
A. 5
B. 60
C. 20
D. 40 - Which of the following is the most suitable for preheating combustion air above 650°C ?
A. Regenerator
B. Metallic recuperator
C. Ceramic recuperator
D. None of these - Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above _____________ °C, because corrosion prevails at higher temperatures?
A. 350
B. 750
C. 1050
D. 1250 - The thermal efficiency of an air/fuel gas preheating recuperator may be as high as _____________ percent?
A. 50
B. 65
C. 85
D. 99 - Regenerators compared to the recuperators for the same duty__________________?
A. Occupy more space
B. Are less costly
C. Are of smaller size
D. All A., B. and C. - Regenerators as compared to recuperators for the same duty_________________?
A. Store smaller quantity of waste heat
B. Are lighter & compact
C. Involve higher initial cost
D. All A., B. & C. - Which furnace employs preheating, heating and soaking zones ?
A. Soaking pit
B. Reheating furnace
C. Open hearth furnace
D. Cupola - Advantages of use of preheated combustion air are__________________?
A. Saving in fuel consumption
B. Reduction in scale losses
C. Increase in flame temperature
D. All A., B. and C. - Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace ?
A. Increase in calorific value of the fuel
B. Increase in flame temperature
C. Reduction in scale losses
D. Saving in fuel consumption
