GATE AE topic:aerospace-engineering PYQs & Answers — Page 7

Questions 61–70 of 650. Imported answers require independent review unless marked reviewed.

A centrifugal compressor has a constant-width radial diffuser. The diameters at the diffuser inlet and outlet are 0.2 m and 0.3 m, respectively. The flow at the diffuser inlet and outlet is assumed to be steady and uniform. The average velocity at the diffuser inlet and outlet are

m/s and

m/s, respectively. If the flow through the diffuser is treated as steady and incompressible, the value of

is ________ (rounded off to the nearest integer).

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A gas mixture at a pressure of 800 kPa and a density of 5 kg/m

enters a turbine stage. The temperature of the gas at the nozzle exit and the stage exit are 790 K and 750 K, respectively. Assume the specific heats are constant for the gas mixture in the range of temperatures considered. The specific heat at constant pressure is 0.72 kJ/kg-K and the ratio of specific heats is 1.33. The value of the degree of reaction of the turbine stage is ________ (rounded off to 2 decimal places).

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Thin airfoil theory predicts the zero-lift angle of attack

of NACA 2412 airfoil as

. The corresponding prediction of

for NACA 5410 airfoil is ________ degrees (rounded off to 1 decimal place).

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Consider a centered Prandtl-Meyer expansion fan at a

corner in a Mach 1.78 air flow, as shown in the figure below. The angle

(see figure) made by the ending wave of the fan with respect to the incoming stream is ________ degrees (rounded off to 1 decimal place).

An excerpt from the table of Prandtl-Meyer function for air is provided below.

Diagram for Aerospace Engineering question 64

M	[deg]	M	[deg]	M	[deg]
1.72	18.40	1.82	21.30	1.92	24.15
1.74	18.98	1.84	21.88	1.94	24.71
1.76	19.56	1.86	22.45	1.96	25.27
1.78	20.15	1.88	23.02	1.98	25.83
1.80	20.73	1.90	23.59	2.00	26.38

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A Mach 1.5 air flow enters a round duct of length 20 cm and diameter 3 cm. If the flow exits with Mach number 1.1, the average Fanning friction factor

of the duct is ________

(rounded off to 1 decimal place).

An excerpt from the Fanno flow table for air is given below.

	1.1	1.2	1.3	1.4	1.5	1.6
	99.35	336.4	648.3	997.4	1361	1724

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Courage : Bravery :: Yearning : _________

Select the most appropriate option to complete the analogy.

Your answerChoose one option.

Longing

Yelling

Yawning

Glaring

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We __________ tennis in the lawn when it suddenly started to rain.

Select the most appropriate option to complete the above sentence.

Your answerChoose one option.

have been playing

had been playing

would have been playing

could be playing

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digital image has pixel intensities (

) as shown in the figure. The number of pixels with

is:

Diagram for Aerospace Engineering question 3

Your answerChoose one option.

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In the given figure, the numbers associated with the rectangle, triangle, and ellipse are 1, 2, and 3, respectively. Which one among the given options is the most appropriate combination of P, Q, and R?

Diagram for Aerospace Engineering question 4

Your answerChoose one option.

P = 6; Q = 5; R = 3

P = 5; Q = 6; R = 3

P = 3; Q = 6; R = 6

P = 5; Q = 3; R = 6

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A rectangle has a length L and a width W, where L > W. If the width, W, is increased by 10%, which one of the following statements is correct for all values of L and W?

Your answerChoose one option.

Perimeter increases by 10%.

Length of the diagonals increases by 10%.

Area increases by 10%.

The rectangle becomes a square.

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GATE AE topic:aerospace-engineering PYQs

Question 61

Question 62

Question 63

Question 64

Question 65

Question 1

Question 2

Question 3

Question 4

Question 5