Δt
Δt²
Δt³
√Δt
✅ The correct answer is option A.
Engineering
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2472. Which is a regenerative furnace?
Coke oven heating chamber
Open hearth furnace
Both A and B
Neither A nor B
✅ The correct answer is option C.
2473. Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace?
Economiser
Regenerator
Ceramic recuperator
Waste heat boiler
✅ The correct answer is option B.
2474. Double pipe heat exchangers are preferably useful, when
High viscosity liquid is to be cooled
Requirement of heat transfer area is low
Overall heat transfer co-efficient is very high
A corrosive liquid is to be heated
✅ The correct answer is option B.
2475. The heating capacity of muffle furnace depends on the
Surface area & emissivity of the stock
Properties of the muffle wall (temperature, area, emissivity)
Both A & B
Neither A nor B
✅ The correct answer is option C.
2476. Pulverised fuel fired furnaces employ __________ fuel firing.
Horizontal
Vertical
Tangential
All of the above
✅ The correct answer is option D.
2477. Means for giving direction to the circulation of gases in furnaces are
Fans
Arrangement of heating stock in the furnaces
Location of outlet ports and heating & combustion devices
All of the above
✅ The correct answer is option D.
2478. (Cp . μ)/K is termed as the __________ number.
Grashoff
Nusselt
Prandtl
Stanton
✅ The correct answer is option C.
2479. The advantage of using a 1 – 2 shell and tube heat exchanger over a 1 – 1 shell and tube heat exchanger is
Lower tube side pressure drop
Lower shell side pressure drop
Higher tube side heat transfer co-efficient
Higher shell side heat transfer co-efficient
✅ The correct answer is option C.
2480. The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.
50
65
85
99
✅ The correct answer is option C.