MECHANISM AND MACHINE MCQ-03

Q.1 The tendency of a body to resist change from rest or motion is known as___.

A. Inertia

B. Mass

C. Volume

D. Energy

Ans-: A

Q.2 When a ship travels in a sea, which of the effect is more dangerous 

A. Pitching

B. Rolling

C. Steering

D. None of the above

Ans-: A

Q.3 A belt transmitting hourse power is generally dependent upon the ____.

A. Speed of pulley

B. Tension on slack side of belt

C. Tension on tight side of belt

D. Radius of pulley

E. All of the above

Ans-: E

Q.4 In an ideal machine, the output as compared to input is ____.

A. More

B. Less

C. Equal

D. Depending on efficiency

Ans-: C

Q.5 Idler pulley is used for applying ____.

A. Stress

B. Force

C. Power

D. Tension

Ans-: D

Q.6 The indicator using Watt mechanism is known as 

A. Thomson indicator

B. Richard indicator

C. Watt indicator

D. None of the above

Ans-: B

Q.7 The power is transmitted in the automobiles from gear box to differential through the ____.

A. Universal joint

B. Bevel joint

C. Hooke's joint

D. Knuckle joint

Ans-: C

Q.8 A typewriter constitutes ___.

A. Machine

B. Structure

C. Joint

D. Mechanism

Ans-: D

Q.9 The module is equal to ( In a gear drive)

A. 1/ circular pitch

B. 1/ diameteral pitch

C. 2/ diameteral pitch

D. Diameteral pitch/ circular pitch

Ans-: B

Q.10 A pantograph is a Mechanism with the ____.

A. Rolling pair

B. Turning pair

C. Lower pair

D. Higher pair

Ans-: C

MECHANISM AND MACHINE MCQ-02

Q.1 The number of links in pantograph Mechanism is ____.

A. 2

B. 3

C.5

D.3

Ans-: D

Q.2 The motion transmitted between the teeth of gears in mesh is ___.

A. Rolling

B. Partly rolling

C. Partly sliding

D. B+C

An-:D

Q.3 In higher pair, the relative motion is combination of sliding and_____.

A. Rotary

B. Turning

C. A+B

D. None of the above

Ans-: B

Q.4 The Hooke's joint consists of _____ .

A. Two forks

B. Three forks

C. Five forks

D. One forks

Ans-: A

Q.5 Ball bearing and roller bearing is the example of _____.

A. Sliding pair

B. Higher pair

C. Rolling pair

D. Lower pair

Ans-: C

Q.6 In gear tooth the radial distance from the pitch circle to the bottom of the tooth space is known as_.

A. Addendum

B. Dedendum

C. Module

D. Pitch circle

Ans-: B

Q.7 In gear tooth the radial distance from the pitch circle to the tip of the tooth is called ?

A. Dedendum

B. Pitch circle

C. Module

D. Addendum

Ans-: D

Q.8 Any combination of gear wheels by means of which motion is transmitted from one shaft to other is known as _____.

A. Gear bus

B. Gear train

C. Gear cycle

D. Gear combination

Ans-: B

Q.9 The length of the pitch circle diameter per tooth is called___.

A. Module

B. Addendum

C. Dedendum

D. Pitch circle

Ans-: A

Q.10 Dedendum is equal to ___.

A. Addendum + clearance

B. Addendum + module

C. Module + pitch circle

D. None of the above

Ans-: A

MECHANISM AND MACHINE

Q.1 Which of the following is the example of lower pairs?

A. Automobile steering gear

B. Shaft revolving in a bearing

C. Straight line motion Mechanisms

D. All of the above

Ans-: D

Q.2 What is the purpose of link?

A. Transmit motion

B. Act as a support

C. Guide other links

D. All of the above

Ans-: D

Q.3 A simple Mechanism has ____ links.

A. 1

B. 4

C. 2

D. 3

Ans-: B

Q.4 Pulley in a belt drive acts as __.

A. Rolling pair

B. Surface pair

C. Sliding pair

D. All off the above

Ans-: A

Q.5 Which of the following is a lower pair?

A. Belt drive

B. Ball and socket

C. Piston and cylinder

D. B+C

Ans-: D

Q.6 A universal joint is an example of___.

A. Rolling pair

B. Higher pair

C. Lower pair

D. Turning pair

Ans-: C

Q.7 Which of the following is a closed pair ?

A. Lower pair

B. Higher pair

C. Turning pair

D. Sliding pair

Ans-: A

Q.8 A joint of two elements permitting relative motion is known as

A. Kinematic pair

B. Lower pair

C. Higher pair

D. Sliding pair

Ans-: A

Q.9 A pair having a point contact or line contact is called ____.

A. Closed pair

B. Higher pair

C. Turning pair

D. None of the above

Ans-: B

Q.10 Unconstrained rigid link in a plane has ____ of freedom.

A. Three degree

B. Two degree

C. Zero degree

D. None of the above

Ans-: A

LINK AND PAIRS

LINK -: Every part of a machine having motion re-lative to some other part is called link. In other words a link is defined as a rigid body having two or more pairing elements which connect it to the other bodies for the purpose of transmitting force or motion.                                                                      In every machine, at least one link either occupies a fixed position . And also carries the machine as a whole along with it during motion. A example of link is bicycle chain silver necklace etc.

PAIRS -:                                                                                   In a machine when two links or elements are contact ecah other ,they form a pair. If the relative motion between them is completely or successfully constrained in a definite direction, then the pair is known as Kinematic pair.

LOWER PAIR-:                                                                     The Lower pairs are those in which two elements have surface contact and relative motion takes place between them, e.g. nut and the screw, the universal joint used to connect two propeller shafts. A lower pair is an ideal joint that constrains contact between a surface in moving body to a corresponding surface in the fixed body.

HIGHER PAIR-:                                                                     The higher pairs have the line or point contact and pair is forced-closed in order to provide completely constrained motion. Two ele-ments held together mechanically from a closed pair and those not held together mechanically from unclosed pair.

KINEMATIC CHAIN

KINEMATIC CHAIN -: A kinematic chain is one in which the number of links are so connected that the relative motion of any point on a link with re-spect to any other point on the other link follows a law.

For a kinematic chain the relationship between number of links L and number of joints J is -

L = 2/3 ( J+2 )

In the above equation, each higher pair is taken equivalent to two lower pairs and an additional link.

MECHANISM

MECHANISM-:                                                                        A mechanism is a device which is designed to transform input forces and movement into a set of output forces and movement.It is formed when one link for kinematic chain is fixed, and the arra-ngement is used for transmitting or transforming motion. 

Mechanisms generally consist of moving compo-nents such as gears and gear trains, belt and the chain drives, cam and follower mechanisms, and linkages.

            Mechanism also consist of friction devices such as brakes and clutches, structural compone-nts such as the frame, bearing lubricants fastene-rs , springs and seals and also consist specialized machine elements such as pins, keys made splines. Each mechanism is termed as inversion of the original kinematic chain. The mechanism obtained in this way may be very different in the appearance and in the purposes for which they are used.

STRENGTH OF MATERIAL MCQ-11

Q.1 Principal plane is one which shear stress is__.

A. One

B. Zero

C. Two

D. Three

Ans-: B

Q.2 The normal stress on the shear plane is ____.

A. Zero

B. Maximum

C. Minimum

D. None of the above

Ans-: A

Q.3 Where bending moment is maximum,what is the value of shear force?

A. One 

B. Two

C. Zero

D. Four

Ans-: C

Q.4 The volumetric strain of cylindrical bar is equal to sum of longitudinal strain and twice of __.

A. Strain

B. Stress

C. Shear stress

D. Diameteral strain

Ans-: D

Q.5 The bending moment at hinge is ___.

A. One

B. Two

C. Three

D. Zero

Ans-: D

Q.6 The rate of change of shear force is equal to

A. Load

B. Stress

C. Shear strain

D. None of the above

Ans-: A

Q.7 The ability of a material to absorb energy in the elastic region when strained is called?

A. Elasticity

B. Malleability

C. Resilience

D. Ductility

Ans-: C

Q.8 The radius of mohr's circle represent tha value of _____ shear stress.

A. Minimum

B. Maximum

C. Constant

D. None of the above

Ans-: B

Q.9 A vertical structural member subjected to the compression is known as___.

A. Strut

B. Beam

C. Cantilever beam

D. Column

Ans-: D

Q.10 A inclined member subjected to compression is Known as____.

A. Column

B. Beam

C. Strut

D. None of the above

Ans-: C