GATE ME format:mcq PYQs & Answers — Page 55

Questions 541–550 of 599. Imported answers require independent review unless marked reviewed.

Topic practice 599 questionsPage 55 of 60

Which one of the following statements is TRUE?

Your answerChoose one option.

Both Pelton and Francis turbines are impulse turbines.

Francis turbine is a reaction turbine but Kaplan turbine is an impulse turbine.

Francis turbine is an axial-flow reaction turbine.

Kaplan turbine is an axial-flow reaction turbine.

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A particle of unit mass is moving on a plane. Its trajectory, in polar coordinates, is given by

, where

is time. The kinetic energy of the particle at time

Your answerChoose one option.

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A mass

of a perfect gas at pressure

and volume

undergoes an isothermal process. The final pressure is

and volume is

. The work done on the system is considered positive. If

is the gas constant and

is the temperature, then the work done in the process is

Your answerChoose one option.

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If a mass of moist air contained in a closed metallic vessel is heated, then its

Your answerChoose one option.

relative humidity decreases

relative humidity increases

specific humidity increases

specific humidity decreases

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Consider a beam with circular cross-section of diameter

. The ratio of the second moment of area about the neutral axis to the section modulus of the area is

Your answerChoose one option.

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For the stability of a floating body the

Your answerChoose one option.

centre of buoyancy must coincide with the centre of gravity

centre of buoyancy must be above the centre of gravity

centre of gravity must be above the centre of buoyancy

metacentre must be above the centre of gravity

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Consider a laminar flow at zero incidence over a flat plate. The shear stress at the wall is denoted by

. The axial positions

and

on the plate are measured from the leading edge in the direction of flow. If

, then

Your answerChoose one option.

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The damping ratio for a viscously damped spring mass system, governed by the relationship

, is given by

Your answerChoose one option.

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Consider the schematic of a riveted lap joint subjected to tensile load

, as shown below. Let

be the diameter of the rivets, and

be the maximum permissible tensile stress in the plates. What should be the minimum value for the thickness of the plates to guard against tensile failure of the plates? Assume the plates to be identical.

Diagram for Mechanical Engineering question 19

Your answerChoose one option.

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The emissive power of a blackbody is

. If its absolute temperature is doubled, the emissive power becomes

Your answerChoose one option.

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GATE ME format:mcq PYQs

Question 13

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Question 14

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Question 16

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Question 18

Question 19

Question 19