2461. It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is
> 0.75
< 0.75
< 0.50
< 0.25
✅ The correct answer is option B.
2466. Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid?
Bleed point
Vent
Catchall
Baffle
✅ The correct answer is option C.
2468. Which characteristic of a fluid is not important in deciding its route in a shell and tube heat exchanger?
Corrosiveness
Fouling characteristic
Viscosity
None of these
✅ The correct answer is option D.
2471. For small temperature difference, the heat transfer rate as per Newton’s law of cooling is proportional to (where, Δt = excess temperature)
Δt
Δt²
Δt³
√Δt
✅ The correct answer is option A.
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.
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.
2462. The function of an economiser in a boiler is to preheat the
Feedwater
Combustion air
Pulverised coal
Furnace oil
✅ The correct answer is option A.
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.
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.