1411. For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it
Occupies smaller space
Is more economical
Is easy to operate and maintain
All of the above
✅ The correct answer is option D.
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.
1412. The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium. This is __________ law.
Kirchoffs
Planck’s
Wien’s displacement
Stefan-Boltzman
✅ The correct answer is option A.
1413. Reynold’s analogy states that
Nst α f
Nst α NRe
NNu α f
NRe α f
✅ The correct answer is option A.
1414. In the equation Q = UAΔt; Δt is
Geometric mean temperature difference
Arithmetic mean temperature difference
Logarithmic mean temperature difference
The difference of average bulk temperatures of hot and cold fluids
✅ The correct answer is option C.
1415. In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is
Linear
Hyperbolic
Parabolic
None of these
✅ The correct answer is option C.
1416. jH factor for heat transfer is not a function of the __________ number.
Reynolds
Nusselt
Grashoff
Both B & C
✅ The correct answer is option D.
1417. In case of a vertical tube evaporator, with increase in the liquor level, the
Capacity of the evaporator is decreased
Capacity of the evaporator is increased
True temperature drop increases
Both B and C
✅ The correct answer is option A.
1418. An insulator should have
Low thermal conductivity
High thermal conductivity
Less resistance to heat flow
A porous structure
✅ The correct answer is option A.
1419. In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is __________ the outlet temperature of the cold fluid.
Equal to
More than
Less than
Either more or less than (depending upon the fluid)
✅ The correct answer is option A.
1420. Heat transfer co-efficient (h1) for liquids increases with
Increasing temperature
Decreasing temperature
Decreasing Reynolds number
None of these
✅ The correct answer is option A.