Test: Theory of Machines - 1
24 Questions MCQ Test Mechanical Engineering SSC JE (Technical) | Test: Theory of Machines - 1
Ball in socket joint is an example of
The ball and socket joint is an example of spherical pair. When the two elements of a pair are connected in such a way that one element turns or swivels about the other fixed element, the pair formed is called a spherical pair.
If we replace a higher pair, the number of lower pair we will have to introduce is
These are 4 links joined together by a pin joint.The number of binary pairs is
Maximum degree of freedom of a 2D planner mechanism is,
Identify the given gear.
The given diagram is of a helical gear. In helical gears, the teeth are inclined to the axis of the gear. The gears can be either left handed or can be right handed depending on the direction in which the helix slopes when viewed. Here, 1 is left handed gear and 2 is a right handed gear.
Which of the following is grubler's equation.
The number of unique inversions of a 4 bar mechanics are
There are three inversions: 1) Beam Engine or Crank and lever mechanism. 2) Coupling rod of locomotive or double crank mechanism. 3) Watt's straight line mechanism or double lever mechanism.
Golden linkage is a
Beam engine is a practical example of
In a crank and slotted lever quick return motion mechanism length of slotted bar in 150 cm length of crank is 50 cm and length of connecting rod is 75 cm. The stroke length is
If number of links is 10. The number of I. centers
Axode mean
The I-center of a sliding pair sliding at a concave upward surface lies at
Calculate the thrust in connecting rod, if piston effort is 200 kN and crank makes an angle of 45o from TDC. Assume obliquity ratio = 3.5
The acceleration respo nsible for change in direction in circular motion is
If velocity of slider is 4m/s and The angular velocity of the link where the slider is sliding is 5 rad/s the coriolis acceleration is
The direction of coriolis acceleration is
If M.A = Mechanical Advantage, then for a machine
Which of the following is a positive drive
Positive drive means movement without slip such as the case in the linking between the crankshaft an the camshaft in the reciprocating engine. Negative drive, is an unusual term, allows slippage as with belt drive.
Gears are said to be 'POSITIVE DRIVE" because there is no slippage between the input and output.
Which of the gears has no axial thrust
The velocity ratio for mitre gears is
For a worm and worm wheel drive
1. worm has high spiral angle
2. worm wheel has high spiral angle
3. used for very high speed reduction
4. worm wheel is the driver
Which of the following is/are correct.
Correct Answer :- c
Explanation : The worm can be considered resembling a helical gear with a high helix angle. For extremely high helix angles, there is one continuous tooth or thread. For slightly smaller angles, there can be two, three or even more threads.
The worm wheel is similar in appearance to a spur gear the worm gear is in the form of a screw generally with a flank angle of 20°.
Self-locking means it is not possible to drive the worm using the worm wheel, and this feature is used in such things as reversing prevention systems.
Which of the following is the most important circle of a gear.
Correct Answer :- C
Explanation : PITCH CIRCLE is the circle derived from a number of teeth and a specified diametral or circular pitch. Circle on which spacing or tooth profiles is established and from which the tooth proportions are constructed. PITCH CYLINDER is the cylinder of diameter equal to the pitch circle.
Diameter of a gear is 10cm and no of laths is 25.The module of the gear is
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