GATE CH topic:chemical-engineering PYQs & Answers — Page 35

Questions 341–350 of 650. Imported answers require independent review unless marked reviewed.

Heat transfer coefficient for a vapor condensing as a film on a vertical surface is given by

Your answerChoose one option.

Dittus-Boelter equation

Nusselt theory

Chilton-Colburn analogy

Sieder-Tate equation

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In a double-pipe heat exchanger of 10 m length, a hot fluid flows in the annulus and a cold fluid flows in the inner pipe. The temperature profiles of the hot (

) and cold (

) fluids along the length of the heat exchanger (

, such that

), are given by

where

and

are in °C, and

is in meter. The logarithmic mean temperature difference (in °C) is

Your answerChoose one option.

24.6

27.9

30.0

50.0

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For a shell-and-tube heat exchanger, the clean overall heat transfer coefficient is calculated as 250 W m

for a specific process condition. It is expected that the heat exchanger may be fouled during the operation, and a fouling resistance of 0.01 m

K W

is prescribed. The dirt overall heat transfer coefficient is _____ W m

Your answerChoose one option.

100

150

200

250

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In reverse osmosis, the hydraulic pressure and osmotic pressure at the feed side of the membrane are P₁ and π₁, respectively. The corresponding values are P₂ and π₂ at the permeate side. The membrane, feed, and permeate are at the same temperature. For equilibrium to prevail, the general criterion that should be satisfied is

Your answerChoose one option.

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Ethylene adsorbs on the vacant active sites V of a transition metal catalyst according to the following mechanism.

Diagram for Chemical Engineering question 10

and

denote the total number of active sites, number of vacant active sites and number of adsorbed C₂H₄ molecules, respectively, the balance on the total number of active sites is given by

Your answerChoose one option.

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Which of the following is NOT a standard to transmit measurement and control signals?

Your answerChoose one option.

4–20 mA

3–15 psig

0–100 %

1–5 VDC

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A feedforward controller can be used only if

Your answerChoose one option.

the disturbance variable can be measured

the disturbance variable can be manipulated

the disturbance variable can be ignored

regulatory control is not required

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Turnover ratio is defined as

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A principal amount is charged a nominal annual interest rate of 10%. If the interest rate is compounded continuously, the final amount at the end of one year would be

Your answerChoose one option.

higher than the amount obtained when the interest rate is compounded monthly

lower than the amount obtained when the interest rate is compounded annually

equal to 1.365 times the principal amount

equal to the amount obtained when using an effective interest rate of 27.18%

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Match the common name of chemicals in Group – 1 with their chemical formula in Group – 2.

Group – 1		Group – 2
P	Gypsum	I	Ca(H₂PO₄)₂
Q	Dolomite	II	CaSO₄.2H₂O
R	Triple superphosphate	III	CaCO₃.MgCO₃

The correct combination is:

Your answerChoose one option.

P – III, Q – II, R – I

P – III, Q – I, R – II

P – II, Q – III, R – I

P – II, Q – I, R – III

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GATE CH topic:chemical-engineering PYQs

Question 6

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Question 10

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Question 15