Quiz 2 Theory of machine basic Objective Online Quiz

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1) The Ackermann steering gear is the inversion of

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Detailed ans : Ackermann steering geometry is a geometric arrangement of linkages in the steering of a car or other vehicle designed to solve the problem of wheels on the inside and outside of a turn needing to trace out circles of different radii. .It has Four Turing pair or All turning pair.

2) The differential mechanism of an automobile is having

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Detailed ans : Differential is the main component of the power train. It is bolted on the rear axle and connects the propeller shaft to the rear wheels. While a vehicle taking a turn, its outer wheel run faster than the inner wheel. If we connects the propeller shaft by rear axle without using of differential gear, than the torque transmitted both the rear wheels is equal in any condition. So the both rear wheels will run at same speed while taking a turn which occur a problem in driving a vehicle. To eliminate this problem a device is used which is known as differential.

3) The function of an element is to

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Detailed ans : Kinematic link: Each part of a machine, which moves relative to some other part, is known as a kinematic link (or simply link) or element. A link may consist of several parts, which are rigidly fastened together, so that they do not move relative to one another.

4) The following is the inversion of slider crank chain mechanism

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Detailed ans : We know that by fixing, in turn, different links in a kinematic chain, an inversion is obtained and we can obtain as many mechanisms as the links in a kinematic chain. It is thus obvious, that four inversions of a single slider crank chain are possible. Slider crank chain: This is a kinematic chain having four links. It has one sliding pair and three turning pairs. Link 2 has rotary motion and is called crank. Link 3 has got combined rotary and reciprocating motion and is called connecting rod. Link 4 has reciprocating motion and is called slider. Link 1 is frame (fixed). This mechanism is used to convert rotary motion to reciprocating and vice versa.

5) The Klein's diagram is useful to find

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Detailed ans : Klein's Construction is mainly used to find out acceleration.

6) The moment on the pulley which produces rotation is called

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Detailed ans : Torque, moment, or moment of force is the tendency of a force to rotate an object about an axis,[1] fulcrum, or pivot. Just as a force is a push or a pull, a torque can be thought of as a twist to an object. Mathematically, torque is defined as the cross product of the vector by which the force's application point is offset relative to the fixed suspension point (distance vector) and the force vector, which tends to produce rotation.

7) For fluctuating loads, well suited bearing is

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Detailed ans : Needle bearings have a large surface area that is in contact with the bearing outer surfaces compared to ball bearings. Additionally there is less added clearance (difference between the diameter of the shaft and the diameter of the bearing) so they are much more compact. The typical structure consists of a needle cage which orients and contains the needle rollers, the needle rollers themselves, and an outer race (sometimes the housing itself).

8) The connection between the piston and cylinder in a reciprocating engine corresponding to

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Detailed ans : Successfully constrained motion. When the motion between the elements, forming a pair, is such that the constrained motion is not completed by itself, but by some other means, then the motion is said to be successfully constrained motion. Consider a shaft in a foot-step bearing. The shaft may rotate in a bearing or it may move upwards. This is a case of incompletely con strained motion. But if the load is placed on the shaft to prevent axial upward movement of the shaft, then the motion of the pair is said to be successfully constrained motion. The motion of an I.C. engine valve (these are kept on their spring) and the piston reciprocating inside an engine cylinder seat by a are also the examples of successfully constrained motion

9) Consider the following pairs of parts: 1. Pair of gear in mesh 2. Belt and pulley 3. Cylinder and piston 4. Cam and follower Among these, the higher pairs are

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Detailed ans : kinematic Pair: The two links or elements of a machine, when in contact with each other, are said to form a pair. If the relative motion between them is completely or successfully constrained (i.e. in a definite direction), the pair is known as kinematic pair. Let us discuss the various types of constrained motions.

10) A planar mechanism has 8 links and 10 rotary joints. The number of degrees of freedom of the mechanism, using Grubler's criterion, is

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Detailed ans : Whatever may be the number of links and joints Grubler's criterion applies to mechanism with only single degree freedom. Subject to the condition 3l-2j-4=0 and it satisfy this condition.

11) Inversion of a mechanism is

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Detailed ans : We know that when one of links is fixed in a kinematic chain, it is called a mechanism. So we can obtain as many mechanisms as the number of links in a kinematic chain by fixing, in turn, different links in a kinematic chain. This method of obtaining different mechanisms by fixing different links in a kinematic chain, is known as inversion of the mechanism. It may be noted that the relative motions between the various links is not changed in any manner through the process of inversion, but their absolute motions (those measured with respect to the fixed link) may be changed drastically.

12) The number of inversions for a slider crank mechanism is

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Detailed ans : either by fixing piston , by fixing connecting rod or by fixing crack itself we can obtain main three type of inversions.

13) The type of quick return mechanism employed mostly in shaping machines is:

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Detailed ans : crack and slotted lever mechanism is used for slotting machine because it has two seperate angle, because of this return stroke timing is less than cutting stroke .

14) A standard gear has outside diameter of 96mm and module 3 mm. The number of teeth on the gear is

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Detailed ans : MODULE =PITCH CIRCLE DIA./ NO.OF TEETH ON GEATS T=96/3=32

15) Geneva mechanism is used to transfer components from one station to the other in

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Detailed ans : The Geneva drive or Maltese cross is a gear mechanism that translates a continuous rotation into an intermittent rotary motion. The rotating drive wheel has a pin that reaches into a slot of the driven wheel advancing it by one step. The drive wheel also has a raised circular blocking disc that locks the driven wheel in position between steps.

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