GATE ME format:mcq PYQs & Answers — Page 11

Questions 101–110 of 599. Imported answers require independent review unless marked reviewed.

Consider incompressible laminar flow over a flat plate with freestream velocity of

. The Nusselt number corresponding to this flow velocity is

. If the freestream velocity is doubled, the Nusselt number changes to

. Choose the correct option for

Your answerChoose one option.

1.26

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Consider a hydrodynamically fully developed laminar flow through a circular pipe with the flow along the axis (i.e., z direction). In the following statements,

is the temperature of the fluid,

is the wall temperature and

is the bulk mean temperature of the fluid. Which one of the following statements is TRUE?

Your answerChoose one option.

For a thermally fully developed flow,

, always.

For constant wall temperature of the duct,

Nusselt number varies linearly along the

direction for a thermally fully developed flow.

For constant wall temperature (

) of the duct,

increases exponentially with distance along

direction.

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A furnace can supply heat steadily at 1200 K at a rate of 2400 kJ/min. The maximum amount of power (in kW) that can be produced by using the heat supplied by this furnace in an environment at 300 K is

Your answerChoose one option.

300

150

1800

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Which one of the following statements regarding a Rankine cycle is FALSE?

Your answerChoose one option.

Superheating the steam in the boiler increases the cycle efficiency.

The pressure at the turbine outlet depends on the condenser temperature.

Cycle efficiency increases as condenser pressure decreases.

Cycle efficiency increases as boiler pressure decreases.

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For a ball bearing, the fatigue life in millions of revolutions is given by

, where

is the constant applied load and

is the basic dynamic load rating. Which one of the following statements is TRUE?

Your answerChoose one option.

, assuming that the inner race is fixed and outer race is revolving

, assuming that the outer race is fixed and inner race is revolving

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The change in kinetic energy

of an engine is 300 J, and minimum and maximum shaft speeds are

and

, respectively. Assume that the torque-time function is purely harmonic. To achieve a coefficient of fluctuation of 0.05, the moment of inertia (in kg.m

) of the flywheel to be mounted on the engine shaft is

Your answerChoose one option.

0.113

0.096

0.071

0.053

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A ram in the form of a rectangular body of size

and

is suspended by two parallel ropes of lengths 7 m. Assume the center-of-mass of the body is at its geometric center and

. For striking the object P with a horizontal velocity of 5 m/s, what is the angle

with the vertical from which the ram should be released from rest?

Diagram for Mechanical Engineering question 24

Your answerChoose one option.

67.1°

40.2°

35.1°

79.5°

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A linear spring-mass-dashpot system with a mass of 2 kg is set in motion with viscous damping. If the natural frequency is 15 Hz, and the amplitudes of two successive cycles measured are 7.75 mm and 7.20 mm, the coefficient of viscous damping (in N.s/m) is

Your answerChoose one option.

4.41

7.51

2.52

6.11

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Which one of the following failure theories is the most conservative design approach against fatigue failure?

Your answerChoose one option.

Soderberg line

Modified Goodman line

Gerber line

Yield line

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A rigid massless tetrahedron is placed such that vertex O is at the origin and the other three vertices A, B, and C lie on the coordinate axes as shown in the figure. The body is acted on by three point loads, of which one is acting at A along x-axis and another at point B along y-axis. For the body to be in equilibrium, the third point load acting at point O must be

Diagram for Mechanical Engineering question 27

Your answerChoose one option.

along z-axis

plane but not along

axis

plane but not along

axis

plane but not along

axis

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GATE ME format:mcq PYQs

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Question 27