ENGINEERING MECHANICS MCQ-:03

 Q.1 The example of lever of first order is __.

A. Pair of clinical tongs

B. Pair of scissors

C. Arm of man

D. All of the above 

Ans-: D

Q.2 In actual machines the mechanical advantage is _______ velocity ratio.

A. More than

B. Less than

C. Equal to velocity ratio

D. Zero

Ans-: B

Q.3 Tension in a string is maximum at ____.

A. Mid way

B. Right support 

C. Left support 

D. Quarter span

Ans-: A

Q.4 In ideal machine the mechanical advantage is _______ velocity ratio .

A. More than 

B. Zero

C. Equal to  

D. Less than 

Ans-: C

Q.5 A pair of Smith's tongs is an example of the lever of _______.

A. Second order

B. First order

C. Fourth order

D. Third order

Ans-: A

Q.6 The product of mass and velocity is known as _______.

A. Work

B. Impulse 

C. Momentum 

D. Power

Ans-: C

Q.7 The sum of kinetic and potential energies will be maximum at ______ , when a ball is thrown up.

A. Highest point

B. Ground 

C. In the centre while going up

D. At all the points 

Ans-: D

Q.8 The capacity of doing work is known as ___. 

A. Power

B. Energy 

C. Momentum 

D. Work

Ans-: B

Q.9 One Newton is equal to _____.

A. 10 ^7 dyne

B. 10 ^5 dyne

C. 10 ^3 dyne

D. 10 ^4 dyne 

Ans-: A

Q.10 The rate of doing work is known as ___. 

A. Energy 

B. Force 

C. Power 

D. Acceleration 

Ans-: C

ENGINEERING MECHANICS MCQ-: 2

 Q.1 The ratio of the limiting friction and the normal reaction is known as ___.

A. Sliding friction 

B. Coefficient of friction 

C. Angle of repose

D. Angle of friction 

Ans-: B

Q.2 The angle of projection should be ______ , for maximum range of a projectile. 

A. 30 °

B. 45 °

C. 0 °

D. 60 °

Ans-: B

Q.3 The frictional force encountered after commencement of motion is called _____.

A. Dynamic friction 

B. Limiting friction 

C. Kinematic friction 

D. None of the above 

Ans-: A

Q.4 Which of the following is not the unit of energy?

A. Kg m

B. Kcal

C. Watt hours

D. Watts

Ans -: D

Q.5 The friction force acting when the body is in motion known as ______ .

A. Limiting friction 

B. Dynamic friction 

C. Kinematic friction 

D. Sliding friction 

Ans-: C

Q.6 The centre of gravity of a plane laminar will not be at its geometrical centre in the case of a _______.

A. Rectangular 

B. Circle 

C. Right angled triangle 

D. Square 

Ans-: C

Q.7 The centre of gravity of a right circular solid Cone height h lies at the following  distance from the base ?

A. h/3

B. h/2

C. h/ 6

D. h/4

Ans-: D

Q.8 The friction force acting when the body is just about to move is known as ___. 

A. Limiting friction 

B. Kinematic friction 

C. Sliding friction 

D. None of the above

Ans-: A

Q.9 Coulomb friction is the friction between the bodies having _____  .

A.  relative motion

B. Two dry surface

C. Angular motion

D. All of the above 

Ans-: A

Q.10 Tangent of angle of friction is equal to

A. Angle of repose

B. Friction force 

C. Coefficient of friction 

D. Kinematic friction 

Ans-: C

ENGINEERING MECHANICS MCQ-: 01

 Q.1 work = force × _______ .

 A. Acceleratio                                                      

 B. Distance                                                           

C. Velocity                                                            

 D. Area                                                              

 Ans-: B

Q.2  The change in momentum produced by the action of a force applied on a the body within an infinitely short interval of time is called ?

 A. Force                                                                  

 B. Velocity                                                              

C. Impulse                                                              

D. Frequency                                                          

Ans-: C 

Q.3 The unit of force in S.I. unit is ?

 A. Kilogram                                                            

B. Dyne                                                                    

C. Watt                                                                   

 D. Newton                                                              

And-: D

Q.4 Effect of a force on a body depends upon the ______.

A. Magnitude                                                         

B. Direction                                                           

C. Position or line of action                                 

D. All of the above                                              

Ans-: D

Q.5 Which of the following is not the unit of the power ?

A. Micron                                                               

B. Light year                                                         

C. Millimetre                                                         

D. Milestone.                                                          

Ans-: D

Q.6 Which of the following is applied when trying to turn a key into a lock ?

A. Lever                                                                 

B. Couple                                                               

C. Moment                                                             

D. Coplaner force                                                

Ans -: B

Q.7 The units of moment of inertia of an area are _____.

A. M^4                                                                    .

B. M^3                                                                     

C. Kg/m^2                                                             

D. Kg/m^2                                                               

Ans-: A     

Q.8 The units of moment of inertia of mass are .

A. Kg m^2                                                             

B. Kg/ m^2                                                             

C. M^3                                                                     

D. M^2 / kg                                                              

And-: A

Q.9 Which of the following is not a vector quantity?

A. Velocity                                                             

B. Weight                                                               

C. Moment                                                           

D. Acceleration                                                     

Ans-: B

Q.10 The motion of a particle from one extremity to the other constitutes half an oscillation and is called  ______.

A. Second pendulum                                         

B. Frequency                                                       

C. Beat                                                                   

D. Travel time                                                       

Ans -: C

     

CUTTING FLUID

                       Cutting  fluid  

The Cutting fluids are used to reduce friction , through lubrication, which is a tribological phenomenon characteristic of the machining processes, and occurs at the contact between workpiece and the tool. Also used to remove heat generated from the cutting zone.

Purpose of cutting fluids-: 

• To cool the tool.
• To cool the workpiece. 
• Reduce the friction .
• Protect the finished surface from the corrosion. 
• Reduce the tool wear.

Restrict thermal distortion. 

Types of cutting fluids -: 

1.  Soluble oil
2. Water
3. Mixed oil
4. Chemical additive oil
5. Solid lubricant etc.

ANGLE PLATE

                     Angle plate   

 An angle plate is a work holding device and is used as a fixture in the metal-working.The angle plates are made of  cast iron and is the used in workshop and laboratories. The right angle plates are casted and roughly machin-ed . The holes are provided in vertical plates in order to relive internal stresses. The angle plates are used to check the right angle of the jobs .

This angle plate open and webbed end is the fabricated under strict supervision of highly experienced and professional quality contro-llers. 

Angle plates also may used to hold the work-piece square to the table during marking out the operations. Angle plates are also availab-le adjustable type which can be used for the workpiece that need to be inclined, usually towards a milling cutter.

SIMPLE HARMONIC MOTION

             Simple harmonic motion

If a body moves in a straight line such that it's acceleration is always directed towards a fixed point and is proportional to its distance from the fixed point, it is said to have"simple harmonic motion".                           

Simple harmonic motion is always oscillator . Periodic motion examples are the motion of the hands of a clock, motion of the wheels of a car etc. Simple harmonic motion examples are the motion of pendulum , motion of the spring etc. 

The time taken by the body for one complete oscillation is called time period ' T ' which is equal to 2π/ω ( ω = angular velocity ).                           The acceleration of a particle moving with simple harmonic motion is equal to the  ω^2y ( y = Distance from the mid point ). The velocity of particle moving with the  simple harmoni motion is -:

 V =  ω √ r^2 - y^2   , r = amplitude                     

The time period of simple pendulum is given by ,                                                                                   T = 2π √ l/g                                                         l = length of pendulum 

The motion of particle from one extremity to the other constitutes half an oscillations and called a beat. If a pendulum executes one beat per second or whose time period is the 2 seconds is called " second pendulum ".

For second pendulum,                                                          T = 2π √ l/g   = 2 

SURFACE PLATE

                           Surface plate

The surface plates are extensively used in the workshop and the laboratories as a refe-rence surface testing for flatness of surface. It is a perfectly true surface made of the cast-iron , granite or glass block and set on bench , stand or table with it's flate surface upward . The top face and its adjacent edges are acc-urately machined and scrapped to form a true flate surface. 

     It is used to check the trueness of the flate surface and to copy the master surface on workpiece. It also provide reference datum plan for different measuring instruments as like - V-block, vernier height gauge, dial com-parator etc.