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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1251. A hot liquid is kept in a big room. The logorithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an

Ellipse

Straight line

Parabola

Circular arc

✅ The correct answer is option B.

1252. View factor is important in heat transfer by

Steady state conduction

Natural convection

Forced convection

Radiation

✅ The correct answer is option D.

1253. A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of

2

20.8

20.2

20.5

✅ The correct answer is option B.

1254. Multiple effect evaporators ar used to

Increase the steam economy & decrease the capacity

Increase the steam economy & the capacity

Decrease the steam economy & the capacity

Decrease the steam economy & increase the capacity

✅ The correct answer is option B.

1255. When the ratio of the Grashoff number and to the square of Reynolds number is one, the dominant mechanism of heat transfer is

Free convection

Entry length problem in laminar forced conduction (developing thermal boundary layer)

Mixed convection (both free and forced)

Forced convection

✅ The correct answer is option C.

1256. Heat transfer co-efficient equation for forced convection, Nu = 0.023 Re0.8 . Prn, is not valid, if the value of

N = 0.4 is used for heating

N = 0.3 is used for cooling

Reynolds number for the flow involved is > 10000

Reynolds number for the flow involved is < 2100

✅ The correct answer is option D.

1257. The type of liquor circulation system to be ‘ employed in evaporators (viz. natural or forced circulation) is determined mainly by the __________ of the liquid.

Viscosity

Density

Thermal conductivity

Corrosive nature

✅ The correct answer is option A.

1258. When vaporisation takes place through a blanketting film of gas, the phenomenon is termed as __________ boiling.

Pool

Nucleate

Transition

Film

✅ The correct answer is option D.

1259. Evaporation of 1kg of water from a solution in a single effect evaporator requires about __________ kg of steam.

0.4 – 0.6

1-1.3

1.8-2

2 – 2.4

✅ The correct answer is option B.

1260. Tube pitch is the __________ of tube diameters and the clearances.

Sum

Difference

Ratio

None of these

✅ The correct answer is option A.