Questions 211–220 of 266. Imported answers require independent review unless marked reviewed.

Topic practice 266 questionsPage 22 of 27

Question 55

Open question
AENAT2 marksNeeds review
For the system of springs and masses shown below,

N/m and

kg. The highest natural frequency,

, of the system is _____ radians/s (round off to the nearest integer).
Diagram for Aerospace Engineering question 55


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Question 20

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AENAT1 markNeeds review
The determinant of the matrix

is ______ (accurate to one decimal place).

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Question 21

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AENAT1 markNeeds review
The theoretical maximum velocity (in m/s) of air expanding from a reservoir at 700 K is ________ (accurate to two decimal places). Specific heat of air at constant pressure is 1005 J/(kg-K).

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Question 22

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AENAT1 markNeeds review
For a damped single degree of freedom system with damping ratio of 0.1, ratio of two successive peak amplitudes of free vibration is ________ (accurate to two decimal places).

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Question 23

Open question
AENAT1 markNeeds review
The natural frequency (in rad/s) of the spring-mass system shown in the figure below is ____ (accurate to one decimal place).
Diagram for Aerospace Engineering question 23


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Question 24

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AENAT1 markNeeds review
The stagnation pressures at the inlet and exit of a subsonic intake are 100 kPa and 98 kPa, respectively. The pressure recovery of this intake will be ______ (accurate to two decimal places).

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Question 25

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AENAT1 markNeeds review
A combustor is operating with a fuel-air ratio of 0.03. If the stoichiometric fuel-air ratio of the fuel used is 0.06, the equivalence ratio of the combustor will be ______ (accurate to two decimal places).

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Question 36

Open question
AENAT2 marksNeeds review
Consider the vector field

; where

. The contour integral

, where

is tangent to the contour that encloses the origin, is __________ (accurate to two decimal places).

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Question 37

Open question
AENAT2 marksNeeds review
The magnitude of the x-component of a unit vector at the point (1, 1) that is normal to equipotential lines of the potential function

, where

, is ______ (accurate to two decimal places).

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Question 38

Open question
AENAT2 marksNeeds review
Assuming ISA standard sea level conditions (288.16 K, density of 1.225 kg/m

, g = 9.81 m/s

, R = 287 J/(kg-K)), the density (in kg/m

) of air at Leh, which is at an altitude of 3500 m above mean sea level is ______ (accurate to two decimal places).

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