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

STRENGTH OF MATERIAL MCQ-10

Q.1 How much is infinite life for steel components?

A. One thousand cycles

B. One million cycles

C. One billion cycles

D. Zero cycles

Ans-: B

Q.2 Whta is the bending moment at hinge of beam ?

A. One 

B. Two

C. Zero

D. 1/2

Ans-: C

Q.3 The function of an idler pulley is to _____ tension in the belt.

A. Increase

B. Decrease

C. Constant

D. None of the above

Ans-: A

Q.4 What will be the the bending moment at that section ? Where the shear force is zero along a section.

A. Minimum

B. Zero

C. Maximum

D. Two times

Ans-: C

Q.5 A beam which is supported on more than two supports known as___.

A. Fixed beam

B. Two supports beam

C. Cantilever beam

D. Continuous beam

Ans-: D

Q.6 A ______ is one in which the ends are rigidly fixed in a horizontal position.

A. Fixed beam

B. Continuous beam

C. Cantilever beam

D. None of the above

Ans-: A

Q.7 The line to which longitudinal axis of a beam bends under a given load is called?

A. Bending line

B. Plastic line

C. Elastic line

D. Fatigue line

Ans-: C

Q.8 In the designing of clutch what criteria is adopted from safety consideration?

A. Uniform design

B. Low coast material

C. Uniform wear

D. Uniform tear

Ans-: C

Q.9 What is the ratio of maximum shear stress to average shear stress in a beam of rectangular section?

A. 1:2

B. 1:5

C. 2:3

D. 1:4

Ans-: B

Q.10 Solderberg equation is based on the __.

A. Tensile strength of material

B. Compressive stress of material

C. Ultimate strength of material

D. Yield Strength of material

Ans-: D

STRENGTH OF MATERIAL MCQ-09

Q.1 Stress in a beam and the second modulus are _____.

A. Inversely proportional

B. Directly proportional

C. Equal

D. None of the above

Ans-: A

Q.2 According to Hooke's law, stress and strain are _____.

A. Equal

B. Inversely proportional

C. Directly proportional

D. None of the above

Ans-: C

Q.3 Principal plane carry ____ shear stress.

A. Maximum

B. No 

C. Minimum

D. None of the above

Ans-: B

Q.4  On the mutually perpendicular planes shear stress are ___.

A. Zero

B. Maximum

C. One

D. Equal

Ans-: D

Q.5 Stress in a beam and moment are 

A. Directly proportional

B. Inversely proportional

C. Equal

D. Zero

Ans-: A

Q.6 The steel bars in a concrete beam are embedded ___.

A. At top section

B. Near the top section

C. Near bottom section

D. Any where

Ans-: C

Q.7 The ratio of coil diameter to wire diameter of spring is known as ____.

A. Coil index

B. Spring index

C. Spring capacity

D. None of the above

Ans-: B

Q.8 Which types of beams occur the points of contraflexure?

A. Fixed beam

B. Overhanging beam

C. Cantilever beam

D. A+B

Ans-: D

Q.9 What is the bending moment at hinge?

A. Zero

B. One 

C. 1/4

D.1/2

Ans-: A

Q.10 Stiffness of a beam is ____ to the deflection.

A. Directly proportional

B. Equal

C. Zero

D. Inversely proportional

Ans-: D

STRENGTH OF MATERIAL MCQ-09

Q.1 Hoop stress in thin walled cylinder is ___.

A. Shear stress

B. Radial stress

C. Circumferential tensile stress

D. Longitudinal stress

Ans-: C

Q.2 In the thick cylinder the stresses at any point are ____.

A. Shear

B. Compressive

C. Tensile

D. Principal

Ans-: D

Q.3 The rate of change of shear force at any section is equal to ____.

A. Intensity of loading

B. Deflection

C. Slope

D. Bending

Ans-: A

Q.4 Bending moment is maximum or minimum when shear force along a section is ____.

A. Minimum

B. Zero

C. Maximum

D. None of the above

Ans-: B

Q.5 What happened? When a strip made of Copper and iron is heated .

A. It does not bend

B. It bend with iron at convex side

C. It bend with copper 

D. It bend with copper at concave side

Ans-: B

Q.6 For a cantilever beam carrying concentrated load at end of the beam , the moment diagram will be ?

A. Square

B. Triangle

C. Rectangle

D. Circle

Ans-: B

Q.7 The design of thin cylindrical shell is based on ___.

A. Shear stress

B. Shear strain

C. Hoop stress

D. Longitudinal stress

Ans-: C

Q.8 In a laminated spring the strips are provided in different length for which purpose?

A. Better look

B. Light in weight

C. Equal distribution of stress

D. None of the above

Ans-: C

Q.9 Ratio of thickness to diameter for thin cylinder is ___.

A. 1/20

B.1/50

C.1/30

D. 1/10

Ans-: A

Q.10 During impact loading the stress developed as compared to gradually applied load is __.

A. 2 times 

B. 3 times

C. 1.5 times

D. Zero

Ans-: A

STRENGTH OF MATERIAL

Q.1 Torsion bar are in ______ if same torque acts in each.

A. Parallel

B. Series

C. A+B

D. None of the above

Ans-: B

Q.2 Section modulus Z is expressed as 

A. E/I

B. M/I

C. EI

D. I/y

Ans-: D

Q.3 Strength of a beam is proportional to the square of its ___.

A. Depth

B. Length

C. Width

D. Thickness

Ans-: A

Q.4 The ratio of stress intensity to volumetric strain is known as ___.

A. Modulus of elasticity

B. Modulus of rigidity

C. Bulk modulus of a material

D. None of the above

Ans-: C

Q.5 For a cantilever beam carrying uniformly distributed load ,the moment diagram will be__.

A. Cubic

B. Triangle

C. Parabola

D. Rectangle

Ans-: C

Q.6 Strength of beam is directly proportional to it's

A. Depth

B. Width

C. Length

D. Hight

Ans-: B

Q.7 The steel bars in reinforced cement concrete beam are located at ____.

A. Bottom

B. Top

C. Centre

D. Neutral axis

Ans-: A

Q.8 The bending moment on a section is _______ where shearing force is maximum.

A. Minimum

B. Zero

C. One

D. Maximum

Ans-: D

Q.9 Moment of a beam is defined as it's section modulus multiplied by 

A. Strain

B. Toughness

C. Stress

D. Moment of inertia

Ans-: C

Q.10  The rate of change of bending moment is equal to _____ at the section.

A. Stress

B. Strain

C. Unit stress

D. Shear force

Ans-: D

STRENGTH OF MATERIAL MCQ-07

Q.1 Which type of pressure , a key is subjected as a side pressure as well at shearing forces?

A. Couple force

B. Bearing stresses

C. Fatigue stresses 

D. Shearing stresses

Ans-: B

Q.2 The unit of stress is ?

A. Pascal

B. N/m

C. Kg/m

D. Newton

Ans-: A

Q.3 The ration of the elastic limit to actual stress is known as____.

A. Toughness

B. Factor of safety

C. Factor of stress

D. None of the above

Ans-: B

Q.4 The maximum shear stress developed in a beam of rectangular cross-section is ____ the average shear stress.

A. 2 times

B. 3 times

C. 1.5 times

D. 2.5 times

Ans-: C

Q.5 The ratio of maximum shear stress developed in a rectangular section and circular section of the same area of cross-section is ___.

A. 2.5

B. 4/5

C. 3/4

D. 9/8

Ans-: D

Q.6 Shear stress induced in a shaft subjected to tension will be__.

A. Maximum at centre

B. Minimum at centre

C. Variable

D. None of the above

Ans-: D

Q.7 A structural member subjected to an axial compressive force is called ____.

A. Beam

B. Frame

C. Strut

D. Column

Ans-: C

Q.8 Pressure vessels are not made of rectangular shape, because

A. They do not give pleasing appearance

B. Difficult to fabricate

C. They are not economical

D. None of the above

Ans-: C

Q.9 What happened in winter, when a cylindrical vessel was sealed in summer.

A. Explode

B. Nothing

C. Become tighter

D. Buckle and collapse

Ans-: D

Q.10 In the case of thick cylinder, the ratio of cylinder diameter to wall thickness is less than or equal to ____.

A.10

B. 25

C. 20

D. 35

Ans-: C