Chemical Heat Transfer MCQs

Option A: Horizontal

Option B: Vertical

Option C: Inclined

Option D: Random

Correct Answer: Vertical ✔

Option A: Equal to

Option B: More than

Option C: Less than

Option D: Either more or less than (depending upon the fluid)

Correct Answer: Equal to ✔

Option A: Grashoff

Option B: Reynolds

Option C: Both ‘a’ & ‘b’

Option D: Prandtl & Grashoff

Correct Answer: Grashoff ✔

Option A: Existence of thermal boundary layer

Option B: Temperature gradient produced due to density difference

Option C: Buoyancy of the bubbles produced at active nucleation site

Option D: None of these

Correct Answer: None of these ✔

Option A: Increased steam economy

Option B: Decreased steam consumption

Option C: Both A. and B.

Option D: Increased capacity

Correct Answer: C. Both A. and B. ✔

Option A: Wall or skin friction

Option B: Form friction

Option C: Both A. and B.

Option D: Turbulent flow

Correct Answer: Wall or skin friction ✔

Option A: U1 – U2

Option B: 1/U1 – 1/U2

Option C: 1/U2 – 1/U1

Option D: U2 – U1

Correct Answer: B. 1/U1 – 1/U2 ✔

Option A: 1.26 h1

Option B: 0.794 h1

Option C: 0.574 h1

Option D: 1.741 h1

Correct Answer: 0.794 h1 ✔

Option A: (1/U) Vs. (1/v0.8)

Option B: (1/v0.8) Vs. U

Option C: v0.8 Vs . U

Option D: (1/U) Vs. (1/V)

Correct Answer: (1/U) Vs. (1/v0.8) ✔

Option A: 35.5

Option B: 43.75

Option C: 81.25

Option D: 48.25

Correct Answer: 81.25 ✔

Option A: Decreases the pressure drop

Option B: Decreases the outlet temperature of cooling medium

Option C: Increases the overall heat transfer coefficient

Option D: None of these

Correct Answer: Increases the overall heat transfer coefficient ✔