Chemical Engineering Gate 2022 Questions with Answer

Ques 40 GATE 2022

Rice, a versatile and inexpensive source of carbohydrate, is a critical component of diet worldwide. Climate change, causing extreme weather, poses a threat to sustained availability of rice. Scientists are working on developing Green Super Rice (GSR), which is resilient under extreme weather conditions yet gives higher yields sustainably. Which one of the following is the CORRECT logical inference based on the information given in the above passage?

Ques 41 GATE 2022

A game consists of spinning an arrow around a stationary disk as shown below. When the arrow comes to rest, there are eight equally likely outcomes. It could come to rest in any one of the sectors numbered 1, 2, 3, 4, 5, 6, 7 or 8 as shown. Two such disks are used in a game where their arrows are independently spun. What is the probability that the sum of the numbers on the resulting sectors upon spinning the two disks is equal to 8 after the arrows come to rest?

Ques 42 GATE 2022

Consider the following inequalities.
(i) 3𝑝−𝑞<4
(ii) 3𝑞−𝑝<12
Which one of the following expressions below satisfies the above two inequalities?

Ques 43 GATE 2022

Given below are three statements and four conclusions drawn based on the statements.
Statement 1: Some engineers are writers.
Statement 2: No writer is an actor.
Statement 3: All actors are engineers.

Conclusion I: Some writers are engineers.
Conclusion II: All engineers are actors.
Conclusion III: No actor is a writer.
Conclusion IV: Some actors are writers
. Which one of the following options can be logically inferred?

Ques 44 GATE 2022

Which one of the following sets of pieces can be assembled to form a square with a single round hole near the center? Pieces cannot overlap.

A

B

C

D

Ques 45 GATE 2022

A perfectly insulated double pipe heat exchanger is operating at steady state. Saturated steam enters the inner pipe at 100 °C and leaves as saturated water at 100 °C. Cooling water enters the outer pipe at 75 °C and exits at 95 °C. The overall heat transfer coefficient is 1 kW m^-2 K^-1 and the heat transfer area is 1 m² . The average specific heat capacity of water at constant pressure is 4.2 kJ kg^-1 K^-1 . The required cooling water flow rate is __________ kg s^-1 (rounded off to two decimal places).

Ques 46 GATE 2022

A single-effect evaporator with a heat transfer area of 70 m² concentrates a salt solution using steam. The salt solution feed rate and temperature are 10000 kg h⁻¹ and 40 °C, respectively. The saturated steam feed rate and temperature are 7500 kg h⁻¹ and 150 °C, respectively. The boiling temperature of the solution in the evaporator is 80 °C. The average specific heat of the solution is 0.8 kcal kg⁻¹ K⁻¹. The latent heat of vaporization is 500 kcal kg⁻¹. If the steam-economy is 0.8, the overall heat transfer coefficient is ________ kcal h⁻¹ m⁻² K⁻¹ (rounded off to the nearest integer).

Ques 47 GATE 2022

An equimolar binary mixture is to be separated in a simple tray-distillation column.
The feed rate is 50 kmol min⁻¹. The mole fractions of the more volatile component in the top and bottom products are 0.90 and 0.01, respectively.
The feed as well as the reflux stream are saturated liquids.
On application of the McCabe-Thiele method, the operating line for the stripping section is obtained as
y = 1.5x − 0.005
where y and x are the mole fractions of the more volatile component in the vapor and liquid phases, respectively.

Ques 48 GATE 2022

The dry-bulb temperature of air in a room is 30 °C. The Antoine equation for water is given as
4000 ln P_sat = 12.00 − 40 / T
where T is the temperature in K and P_sat is the saturation vapor pressure in bar. The latent heat of vaporization of water is 2000 kJ kg⁻¹, the humid heat is 1.0 kJ kg⁻¹ K⁻¹, and the molecular weights of air and water are 28 kg kmol⁻¹ and 18 kg kmol⁻¹, respectively. If the absolute humidity of air is Y′ kg moisture per kg dry air, then for a wet-bulb depression of 9 °C, 1000 × Y′ = _________________ (rounded off to one decimal place).

Ques 49 GATE 2022

Consider two stationary spherical pure water droplets of diameters 𝑑 and 2𝑑. CO₂ diffuses into the droplets from the surroundings. If the rate of diffusion of CO₂ into the smaller droplet is 𝑊 mol s⁻¹, the rate of diffusion of CO₂ into the larger droplet is.

Ques 50 GATE 2022

A simple distillation column is designed to separate an ideal binary mixture to specified distillate and bottoms purities at a given column pressure. If RRmin is the minimum reflux ratio for this separation, select the statement that is NOT CORRECT with regard to the variation in the total annualized cost (TAC) of the column with reflux ratio (RR).

Ques 51 GATE 2022

Consider steady-state diffusion in a binary A–B liquid at constant temperature and pressure. The mole-fraction of A at two different locations is 0.8 and 0.1. Let N_A1 be the diffusive flux of A calculated assuming B to be non-diffusing, and N_A2 be the diffusive flux of A calculated assuming equimolar counter-diffusion. The quantity ((N_A1 – N_A2) / N_A1) × 100 is __________ (rounded off to one decimal place).

Ques 52 GATE 2022

Consider interphase mass transfer of a species S between two immiscible liquids A and B. The interfacial mass transfer coefficient of S in liquid A is twice that of in liquid B. The equilibrium distribution of S between the liquids is given by y^S_A = 0.5y^S_B, where y^S_A and y^S_B are the mole-fractions of S in A and B, respectively. The bulk phase mole-fraction of S in A and B is 0.10 and 0.02, respectively. If the steady-state flux of S is estimated to be 10 kmol h^–1 m^–2, the mass transfer coefficient of S in A is ________ kmol h^–1 m^–2 (rounded off to one decimal place).