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Theory of Machi...

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  • Question 1
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    In a four-bar mechanism, the lengths of driver crank, coupler and follower link are 150 mm, 250 mm and 300 mm respectively. The fixed link length is L0. Find the values of Lo so as to make it crank-crank mechanism.

  • Question 2
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    The number degrees of freedom of a planar linkage with 8 links and 9 simple revolute joints is

  • Question 3
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    Match the approaches given below to perform stated kinematics/dynamics analysis of machine.

  • Question 4
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    A flywheel is fitted to engine has a mass of 400kg and radius of gyration 0.2m. If initially engine is at rest and starting torque of engine is 400Nm. What is kinetic energy (kJ) of flywheel after 10 seconds?

  • Question 5
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    If angle of obliquity of pair of gear wheels is 18˚. What is minimum number of teeth on pinion if arc of approach or recess not less than the pitch?

  • Question 6
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    Two 20° pressure angle involute gears in mesh have a module of 10 mm. The larger has 50 teeth and the pinion has 13 teeth. The centre distance between them is

  • Question 7
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    The controlling force in a spring controlled governor is 1500 N when the radius of rotation of the balls is 200mm and 887.5 N when it is 130 mm the mass of each ball is 8 kg by changing the initial tension the governor behaves as isochronous governor. Then

  • Question 8
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    Identify lower pairs. Select the most appropriate answer.

  • Question 9
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    Mechanism which has more than four links is:

  • Question 10
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    The moment of inertia an airplane air screw is 20 kg.m2 and the speed of rotation is 1000 rpm clockwise when viewed from the front. The speed of the flight is 200 km per hour. Find the gyroscopic acceleration (rad2/sec2) of the air screw on the airplane when it makes a left-handed turn on a path of 150 m radius 

  • Question 11
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    Which of the following statements is incorrect

  • Question 12
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    The number of inversions for a slider crank mechanism is

  • Question 13
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    A simple quick return mechanism is shown in the figure. The forward to return ratio of the quick return mechanism is 2: 1. If the radius of the crank O1P is 125 mm, then the distance 'd' (in mm) between the crank centre to lever pivot centre point should be

  • Question 14
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    The turbine rotor of a ship has a mass of 8 tonnes and a radius of gyration 0.6 m. It rotates at 1800 rpm clockwise, when looking from the stern. Determine the gyroscopic couple (in kN-m) if the ship travels at 100 km/hr and steer to the left in a curve of 80 m radius.

  • Question 15
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    In a four-bar linkage, S denotes the shortest link length, L is the longest link length, P and Q are the lengths of other two links. At least one of the three moving links will rotate by 360° if

  • Question 16
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    The lengths of the links of a 4-bar linkage with revolute pairs only are p, q, r, and s Given that p < q < r < s. Which of these links should be the fixed one, for obtaining a “double crank” mechanism?

  • Question 17
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    A machine tool requires a torque of 100 + 20 sin θ N-m of torque, where θ is the crank angle. The power is supplied by an electric motor at uniform rate. A flywheel with a moment of inertia of 20 kg-m2 is attached. The maximum acceleration of the flywheel and the corresponding crank position is

  • Question 18
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    Choose the option which does NOT belong to the category of simple machine:

  • Question 19
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    Two wires AO and BO support a vertical load W at O as shown in the figure below. The wires are of equal length and equal cross sectional area. The tension in each wire is equal to

  • Question 20
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    In a gear box, two meshing gears (Gear and pinion) of involute profile have a module of 5 mm with pressure angle ϕ =20° and a Gear ratio of 3. The number of teeth on Gear is 60 and take addendum as one module. At the end of engagement, if the pinion is rotating with a speed of 20 rad/s, the sliding velocity is

  • Question 21
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    For the planar mechanism shown in figure select the most appropriate choice for the motion of link 2 when link 4 is moved upwards.

  • Question 22
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    Instantaneous center of a body rolling with sliding on a stationary curved surface lies:

  • Question 23
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    The figure below shows a planar mechanism with single degree of freedom. The instant centre 24 for the given configuration is located at a position

  • Question 24
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    In the figure shown, the relative velocity of link 1 with respect to link 2 is 12 m/sec. Link 2 rotates at a constant speed of 120 rpm. The magnitude of Carioles component of acceleration of link 1 is

  • Question 25
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    The Carioles component of acceleration is present

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