GATE XE topic:engineering PYQs & Answers — Page 168

Questions 1671–1680 of 1772. Imported answers require independent review unless marked reviewed.

Topic practice 1772 questionsPage 168 of 178

The structure shown below is of rectangular cross section and carries a load of 10kN at its free end E. Maximum bending stress (in MPa) developed in the beam due the external load is _________. The depth of the beam is 300mm and the width is 150mm.

Diagram for Engineering Sciences question 74

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Two circular rods shown below carry the same axial load

. The Rod-A has uniform cross-section and the Rod-B has non-uniform cross-section as shown. The ratio of elongation of Rod-A to Rod-B is given by

Diagram for Engineering Sciences question 75

Your answerChoose one option.

1:1

1:2

2:1

3:1

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A composite shaft is made of a steel tube with an inner brass core perfectly bonded together as shown. The shaft is fixed at one end and subjected to a torque of

at the other end. Shear modulus of steel is

and that of brass is

. The outer radius of the steel tube is

and radius of the inner brass core is

. The magnitude of shear stress at the interface (point X) and in the steel tube is closest to

Diagram for Engineering Sciences question 76

Your answerChoose one option.

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A massless rod of rectangular cross-section is subjected to a force

at origin

as shown. The expression for the stress

at point

is given by

Diagram for Engineering Sciences question 77

Your answerChoose one option.

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Given

and

, then

Your answerChoose one option.

both

and

are properties

neither

nor

is a property

is a property but

is not a property

is a property but

is not a property

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A paddle wheel is installed in a rigid insulated tank containing 10 kg air (

kJ/kg.K). A torque of 100 N.m is applied on the paddle wheel to rotate it at 60 revolutions per minute for 2 minutes. At the end of the process, the increase in temperature of air in °C is

Your answerChoose one option.

5.25

10.50

21.50

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Consider two systems each containing 20 kg of air at the same temperature and pressure. It is desired to increase the temperature of the air in both systems by 10°C. One system undergoes a constant pressure heat addition process and the other undergoes a constant volume heat addition. The difference in the values of heat transferred to the two systems in kJ is

Your answerChoose one option.

30.5

44.2

57.5

73.2

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A refrigerator is used to maintain certain space at 10°C. It pumps 18000 kJ/hour of heat from the space to the atmosphere at 30°C. If the power input to the refrigerator is 2 kW, the ratio of COP of this refrigerator to that of a Carnot refrigerator (up to 2 decimal places) is ________.

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A thermal cycle receives 200 kJ of heat from a heat source at 1000 K. It rejects 300 kJ of heat to a heat sink at 300 K and also rejects 250 kJ of heat to another heat sink at 200 K during the cycle. The cycle is

Your answerChoose one option.

reversible

irreversible

impossible

work absorbing

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Saturated liquid water is slowly heated at a constant pressure of 200 kPa to a final state where its quality reaches 0.65. For water at 200 kPa:

°C,

kJ/kg,

kJ/kg. The change in the specific entropy in kJ/kg.K is

Your answerChoose one option.

3.04

3.24

3.44

3.64

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GATE XE topic:engineering PYQs

Question 74

Question 75

Question 76

Question 77

Question 78

Question 79

Question 80

Question 81

Question 82

Question 83