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.

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1281. The film co-efficient between condensing vapour and metal wall increases with

Increasing temperature of the vapour

Decreasing temperature of the vapour

Increasing viscosity of the film of condensate

Increasing temperature drop

✅ The correct answer is option A.

1282. Tube expansion allowances exist in __________ heat exchanger.

Multipass fixed tube sheet

U-tube

Single pass fixed tube sheet

None of these

✅ The correct answer is option B.

1283. The maximum heat transfer co-efficient from steam heating will be attained when the steam is

Supersaturated

Saturated

Wet

None of these

✅ The correct answer is option B.

1284. For heat flow through very thick walled cylinder, use____mean radius.

Arithmetic

Logarithmic

Geometric

Either A or C

✅ The correct answer is option B.

1285. Which of the following is concerned with both heat and mass transfer?

Lewis relationship

Nusselt number

Kutateladze number

Froude number

✅ The correct answer is option A.

1286. Economy of a multiple effect evaporator is not influenced much by the

Boiling point elevations

Temperature of the feed

Rate of heat transfer

Ratio of the weight of the thin liquor to thick liquor

✅ The correct answer is option A.

1287. Double pipe heat exchangers are used

When heat transfer area required is very high

When heat transfer area required is very low, i.e (100-200 ft²)

Because it occupies less floor area

Because it is less costly

✅ The correct answer is option B.

1288. A fluid is flowing inside the inner tube of a double pipe heat exchanger with diameter ‘d’. For a fixed mass flow rate, the tube side heat transfer co-efficient for turbulent flow conditions is proportional to

D0.8

D-0.2

D-1

D-1.8

✅ The correct answer is option B.

1289. Boiling point elevation for a strong and concentrated solution is found by Duhring’s rule, which states that at the same pressure, the boiling point of a solution is a linear function of the __________ of pure water.

Boiling point

Dynamic viscosity

Kinematic viscosity

Density

✅ The correct answer is option A.

1290. In evaporators, lowering the feed temperature

Increases the heating area required

Reduces the economy

Both A and B

Decreases the heating area required

✅ The correct answer is option C.