2537. The heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature)
(ΔT)²
(ΔT)⁴
(ΔT)³
√(ΔT)
✅ The correct answer is option C.
2542. What is the unit of thermal conductivity ?
Kcal/hr. m² °C
Kcal/hr.m.°C
Kcal/hr.m
Kcal/hr. °C
✅ The correct answer is option B.
2547. Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
Surrounding temperature
Average temperature of the fin
Temperature of the fin end
Constant temperature equal to that of the base
✅ The correct answer is option D.
2551. In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head.
Twice
Four times
Square root of
Square of
✅ The correct answer is option B.
2556. Heat waves
Can not pass through vacuum
Travel in straight line
Can be reflected by a mirror
Both B and C
✅ The correct answer is option D.
2561. Increasing the liquor level in the evaporator results in the
Decreased capacity
Increase in liquor film co-efficient
Decreased effect of hydrostatic head
Increased true temperature drop
✅ The correct answer is option A.
2566. In a shell and tube heat exchanger, the shell side fluid velocity can not be changed by changing the
Tube layout
Tube diameter
Tube pitch
No. of baffles
✅ The correct answer is option B.
2496. In a forward feed multiple effect, the pressure build up will be
Least at the inlet of the first effect
Least at the outlet of the last effect
Highest at the inlet of the last effect
Highest at the outlet of the last effect
✅ The correct answer is option B.
2501. Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats
P and Q
P and R
P and S
R and S
✅ The correct answer is option C.
2506. The purpose of providing expansion bellows in the shell of tubular exchanger is to
Increase the heating load
Impart structural strength
Account for the uneven expansion of shell and tube bundles
Facilitate increase of shell length, if needed
✅ The correct answer is option C.