GATE PI topic:thermal-fluids-engineering PYQs & Answers — Page 3

Questions 21–30 of 39. Imported answers require independent review unless marked reviewed.

A fluid with dynamic viscosity

Pa.s is flowing through a circular pipe with diameter 1 cm. If the flow rate (discharge) in the pipe is 0.2 liter/s, the maximum velocity in m/s of the fluid in the pipe is (assume fully developed flow and take fluid density

kg/m³) ________. [round off to one decimal place]

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Temperature field inside a sphere of radius

m with origin at its center is

. If thermal conductivity of the sphere material is

W/m.K and Fourier law of heat conduction is valid, net heat leaving the sphere per unit time in W is ________. [round off to one decimal place]

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider flow of an oil with Reynolds number 1500 in a pipe of diameter 5 cm. The kinematic viscosity of the oil,

/s. The value of average velocity in m/s is

Your answerChoose one option.

0.75

1.50

2.25

4.50

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A Carnot heat engine receives 600 kJ of heat per cycle from a source at 627°C and rejects heat to a sink at 27°C. The amount of heat rejected to the sink per cycle (rounded off to the nearest integer) in kJ is

Your answerChoose one option.

200

400

574

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A tank of large cross-sectional area contains water up to a height of 5 m as shown in the figure. The top water surface is under a pressure of

MPa. A small, smooth and round tap at the bottom of the tank is opened to the atmosphere (

MPa).

Diagram for Production and Industrial Engineering question 39

Use the acceleration due to gravity,

m/s

and the density of water,

kg/m

. The velocity with which the water will exit from the tap under the conditions shown in the figure (rounded off to one decimal place) in m/s is __________.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A steel ball of 12 mm diameter is heated to 1225 K. It is slowly cooled in air to a temperature of 475 K. During the cooling process, the ambient temperature is 325 K and the heat transfer coefficient is 30 W/m

-K. Assume the density of steel is 7800 kg/m

and the specific heat is 600 J/kg-K. Using the lumped capacitance method of analysis, the calculated time for the required cooling (rounded off to one decimal place) in seconds is __________.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A mass of 3 kg of Argon gas at 3 bar, 27 °C is contained in a rigid, insulated vessel. Paddle wheel work is done on the gas for 30 minutes at the rate of 0.015 kW. Specific heat at constant volume,

, for Argon is 0.3122 kJ/kg-K. The final temperature of the gas (rounded off to one decimal place) in kelvin is __________.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A heat pump is to supply heat at the rate of 10 kW to a building to be maintained at 22 °C. The outside temperature is 2 °C. The minimum power (in kW) required to run the heat pump is _____ (round off to 2 decimal places)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

One kilogram of air is compressed at constant temperature of 150 °C until its volume is halved. Considering gas constant

kJ/kg-K for air, magnitude of heat rejected (in kJ) in the compression process is _____ (round off to 2 decimal places)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Three Carnot engines

operate as shown in the figure (

Diagram for Production and Industrial Engineering question 29

The efficiency of the engine

in terms of the efficiencies

and

of the engines

and

, respectively, is

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE PI topic:thermal-fluids-engineering PYQs

Question 52

Question 54

Question 11

Question 12

Question 39

Question 40

Question 41

Question 18

Question 19

Question 29