GATE AE discipline:aerospace-engineering PYQs & Answers — Page 37

Questions 361–370 of 650. Imported answers require independent review unless marked reviewed.

A rigid massless rod pinned at one end has a mass

attached to its other end. The rod is supported by a linear spring of stiffness

as shown in the figure.

The natural frequency of this system is:

Diagram for Aerospace Engineering question 26

Your answerChoose one option.

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The figure shows three glasses P, Q and R with water and floating ice cube. Glass P has a solid ice cube, glass Q has an ice cube with a small solid steel ball embedded in it and glass R has an ice cube with an air bubble. After the ice cube melts, the level of water in glasses P, Q and R, respectively:

Diagram for Aerospace Engineering question 27

Your answerChoose one option.

remains same, increases, and decreases

increases, decreases, and increases

remains same, decreases, and decreases

remains same, decreases, and increases

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To estimate aerodynamic loads on an aircraft flying at 100 km/h at standard sea-level conditions, a one-fifth scale model is tested in a variable-density wind tunnel ensuring similarity of inertial and viscous forces. The pressure used in the wind tunnel is 10 times the atmospheric pressure. Assuming ideal gas law to hold and the same temperature conditions in model and prototype, the velocity needed in the wind tunnel test-section is ______.

Your answerChoose one option.

25 km/h

50 km/h

100 km/h

20 km/h

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The figure shows schematic of a set-up for visualization of non-uniform density field in the test section of a supersonic wind tunnel. This technique of visualization of high speed flows is known as:

Diagram for Aerospace Engineering question 29

Your answerChoose one option.

schlieren

interferometry

shadowgraph

holography

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For a conventional fixed-wing aircraft in a 360° inverted vertical loop maneuver, what is the load factor (

) at the topmost point of the loop? Assume the flight to be steady at the topmost point.

Your answerChoose one option.

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Which of the following statement(s) is/are true about the function defined as

for

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

Differentiable at

Continuous at

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A two degree of freedom spring-mass system undergoing free vibration with generalized coordinates

and

has natural frequencies

rad/s and

rad/s, respectively. The corresponding mode shapes are

and

. If the system is disturbed with certain deflections and zero initial velocities, then which of the following statement(s) is/are true?

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

An initial deflection of

cm and

cm would make the system oscillate with only the second natural frequency.

An initial deflection of

cm and

cm would make the system oscillate with only the first natural frequency.

An initial deflection of

cm and

cm would make the system oscillate with a linear combination of first and second natural frequencies.

An initial deflection of

cm and

cm would make the system oscillate with only the first natural frequency.

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A shock moving into a stationary gas can be transformed to a stationary shock by a change in reference frame, as shown in the figure. Which of the following is/are true relating the flow properties in the two reference frames?

Diagram for Aerospace Engineering question 33

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

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For a conventional fixed-wing aircraft, which of the following statements are true?

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

Making

more negative leads to an increase in the frequency of its short-period mode.

Making

more negative leads to a decreased damping of the short-period mode.

The primary contribution towards

is from the aircraft wing.

Increasing the size of the vertical fin leads to a higher yaw damping.

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Which of the following statement(s) is/are true?

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

Service ceiling is higher than absolute ceiling for a piston-propeller aircraft.

For a given aircraft, the stall speed increases with increase in altitude.

Everything else remaining the same, a tailwind increases the range of an aircraft.

For a jet aircraft constrained to fly at constant altitude, there exists an altitude where its range is maximum.

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GATE AE discipline:aerospace-engineering PYQs

Question 26

Question 27

Question 28

Question 29

Question 30

Question 31

Question 32

Question 33

Question 34

Question 35