Download PTU B.Tech 2021 Jan EEE 3rd Sem 76385 Engineering Mechanics Question Paper

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Roll No. Total No. of Pages : 03

Total No. of Questions: 18

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B.Tech. (EE/Electrical & Electronics Engg.) (2018 Batch)

B.Tech. (Electronics & Electrical Engg.) (2018 Batch) (Sem.-3)

ENGINEERING MECHANICS

Subject Code : BTXX-XXX-18

M.Code : 76385

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Time : 3 Hrs. Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

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SECTION-A

Write briefly :

1. Explain Euler's law?
2. Explain Scalar quantities.
3. What are rigid bodies? Explain.

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4. Define a Free Body Diagram. Give two examples.
5. A body of mass 7.5 kg is moving with a velocity of 1.2 m/s. If a force of 15 N is applied on the body, determine its velocity after 2 s.
6. What do you understand by D'Alembert's principle?
7. Explain :
   1. Coefficient of friction
   2. Cone of friction.

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8. Explain parallel and perpendicular axis theorem.
9. Define gyroscope.
10. Explain law of coulomb friction.

SECTION-B

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11. Explain Symmetric and anti-symmetric tensor.
12. In the engine system shown in Fig.1, the crank AB has a constant clockwise angular velocity of 2000 rpm. For the crank position indicated, determine
    1. Angular velocity of the connecting rod BD
    2. The velocity of piston P.
13. A uniform ladder of weight 800 N and of length 7 m rests on a horizontal ground and leans against a smooth vertical wall. The angle made by the ladder with the horizontal is 60°. When a man of weight 600 N stands on the ladder at a distance 4 m from the top of the ladder, the ladder is at the point of sliding? Determine the coefficient of friction between the ladder and the floor.

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14. Find the radius of gyration of a triangle whose base is 40mm and height is 60mm about an axis passing through C.G. and parallel to base (Fig.2).

SECTION-C

15. A dynamics instructor demonstrates gyroscopic principles to his students. He suspends a rapidly spinning wheel with a string attached to one end of its horizontal axle. Describe the precession motion of the wheel.
16. 1. Distinguish kinematics & kinetics.
    2. Drive expression of the angular momentum of a system of point.

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17. A beam ABCDEF of 7.5 m long and span 4.5 m is supported at B and E. The beam is loaded as shown in Fig.3. Find the support reactions at the two supports.
18. A solid steel shaft transmits 200 kW at 300 rpm. Determine the suitable diameter of the shaft if the maximum torque transmitted exceeds the mean 15% in each revolution. The shear stress is not to exceed 60 MPa. Also find the maximum angle of twist in a length of 4 m of the shaft. G = 80 GPa.

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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