GATE XE exam:gate PYQs & Answers — Page 88

Questions 871–880 of 1772. Imported answers require independent review unless marked reviewed.

Which among the following expression(s) is/are correct?

Your answerSelect all correct options. You can choose more than one.

Reynolds number =

Nusselt number =

Schmidt number =

Biot number =

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In sieve analysis of coffee powder, the particle size distribution is given below.

Number of particles Mean particle size (μm) 5 40 8 30 50 20 90 17.5 148 12.5 10 10

The Sauter mean diameter (in μm) of the coffee powder is ______ (round off to one decimal place).

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In a dairy processing plant, milk enters a 30 m long and 2 cm diameter tube at 60 °C and leaves at 57 °C. The total heat loss over the tube length is 381.5 W. The specific heat capacity, density, and viscosity of milk are 3.85 kJ kg⁻¹ K⁻¹, 1020 kg m⁻³, and 1.20 cP, respectively. The Reynolds number for the flow is ______ (round off to the nearest integer).

Given: π = 3.14

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Apple juice flows through a steel pipe having thermal conductivity of 50 W m⁻¹ K⁻¹. The outer surface of pipe is exposed to ambient environment. The inside diameter and thickness of the pipe are 3 cm and 1.5 cm, respectively. The overall heat transfer coefficient based on inside area is 25 W m⁻² K⁻¹. If the internal convective heat transfer coefficient is 30 W m⁻² K⁻¹, the external convective heat transfer coefficient (in W m⁻² K⁻¹) will be ________ (round off to two decimal places).

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The dry bulb temperature and relative humidity of air inside a storage chamber are 37 °C and 50%, respectively. The saturation pressure of water vapour at 37 °C and barometric pressure are 6.28 kPa and 101.32 kPa, respectively. The humidity ratio of air inside the chamber is ______ kg water (kg dry air)⁻¹ (round off to three decimal places).

Given: Molecular weight of water vapour and dry air are 18.02 g mol⁻¹ and 28.97 g mol⁻¹, respectively.

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The figure shows a schematic of vertical profiles of concentrations of two gases P and Q in the atmosphere near a coastal state. The correct pair representing P and Q, respectively, is

Diagram for Engineering Sciences question 154

Your answerChoose one option.

water vapor and CO₂

O₃ and water vapor

CO₂ and O₃

N₂ and O₂

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A form of momentum equation for an incompressible fluid is

(i) (ii) (iii) (iv)

where

is density,

is velocity,

is time,

is pressure,

is viscosity and

represents body force per unit volume. The dimension of term (iii) is

(M, L and T stand for mass, length and time, respectively).

Your answerChoose one option.

[L]¹ [T]⁻²

[M]¹ [L]⁻² [T]⁻²

[M]¹ [L]⁻¹ [T]⁻²

[M]¹ [L]¹ [T]⁻¹

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Tropical cyclones usually do not form close to the Equator primarily because

Your answerChoose one option.

sea surface temperature at the Equator is too cold.

beta effect dissipates clouds.

Coriolis force is too weak.

vertical shear of the zonal wind is weak.

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Which one of the following statements regarding equatorial under current (EUC) in the Pacific Ocean is correct?

Your answerChoose one option.

EUC flows from west to east.

EUC flows from east to west.

EUC flows from north to south.

EUC flows from south to north.

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Which one of the following statements is correct regarding the dominant energy balance in the troposphere in a tropical convergence zone?

Your answerChoose one option.

Shortwave heating balances longwave radiative cooling.

Compressional heating balances radiative cooling.

Radiative cooling balances heating due to viscous dissipation of kinetic energy.

Condensational heating balances adiabatic cooling.

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GATE XE exam:gate PYQs

Question 149

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Question 151

Question 152

Question 153

Question 154

Question 155

Question 156

Question 157

Question 158