Exit-fluid temperature > wall temperature
Exit fluid temperature < wall temperature
Exit fluid temperature = wall temperature
Graetz number > 100
✅ The correct answer is option C.
Engineering
Boost your preparation with the latest Engineering MCQs with answers and explanations. Our collection covers civil engineering, electrical engineering, mechanical engineering, electronics, software engineering, and other core subjects. These multiple-choice questions are designed for students, competitive exam aspirants, and professionals preparing for NTS, PPSC, FPSC, CSS, PMS, PEC exams, university entry tests, and job interviews. Practice online with updated Engineering MCQs to strengthen concepts, improve technical knowledge, and perform better in exams and recruitment tests.
1482. Which of the following has maximum thermal conductivity at the same temperature?
Steel
Petrol
Air
All of the above
✅ The correct answer is option A.
1483. An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is
4000
9000
4600
3000
✅ The correct answer is option A.
1484. The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of ‘n’ is exactly 4 for
Black painted bodies only
All bodies
Polished bodies only
A black body
✅ The correct answer is option B.
1485. For a multipass shell and tube heat exchanger, the LMTD correction factor is always
1
> 1
< 1
Between 1 & 2
✅ The correct answer is option C.
1486. Choose the correct equation.
Nu = (Re) (Pr) (Gz)
Nu = (Re) (Pr) (St)
Nu = (Re)(Pr)
Nu = (Pr)(St)
✅ The correct answer is option B.
1487. Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.)
√d
d
d2
d1.5
✅ The correct answer is option C.
1488. In a single effect evaporator, the economy is
1
< 1
> 1
None of these
✅ The correct answer is option B.
1489. Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.
1
7
18
26
✅ The correct answer is option B.
1490. Air is best heated with steam in a heat exchanger of
Plate type
Double pipe type with fin on steam side
Double pipe type with fin on air side
Shell and tube type
✅ The correct answer is option C.