Showing posts with label Mechanical Engineering Forum. Show all posts
Showing posts with label Mechanical Engineering Forum. Show all posts

Engineering Mechanics Objective Ques-Ans [Part-2]

Engineering Mechanics Objective Questions and Answers

 Engineering Mechanics Objective Questions and Answers. Mechanicale Engineering Quiz Questions with Answers. Important and Useful Quiz questions.

1. A smooth cylinder lying on its convex surface remains in __________ equilibrium.
A.     stable
B.     unstable
C.     neutral
Answer: Option B
2. Coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies.
A.     Yes
B.     No
Answer: Option A
3. Moment of inertia of a circular section about an axis perpendicular to the section is
A. πd3/16
B.    πd3/32
C. πd4/32
D. πd4/64
Answer: Option C
4. The time of flight (t) of a projectile on an upward inclined plane is(where u = Velocity of projection, α = Angle of projection, and β = Inclination of the plane with the horizontal.)

Answer: Option B
5. The unit of angular acceleration is
A.   N-m
B.   m/s
C.   m/s2
D.   rad/s2
Answer: Option D
6. Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its C.G. and parallel to the base, is
A.   bh3/4
B.   bh3/8
C.   bh3/12
D.   bh3/36
Answer: Option D
7. If the masses of both the bodies, as shown in the below figure, are reduced to 50 percent, then tension in the string will be
A.     same
B.     half
C.     double
Answer: Option B
8. Which of the following is an equation of linear motion?(where, u and v = Initial and final velocity of the body, a = Acceleration of the body, and s = Displacement of the body in time t seconds.)
A. v = u + a.t
B.  s = u.t + 1/2 a.t2
C. v2 = u2+2a.s
D.     all of these
Answer: Option D
9. If a number of forces are acting at a point, theirresultant will be inclined at an angle θ with the horizontal, such that
A.     tan θ = ∑H/∑V
B.     tan θ = ∑V/∑H
C.     tan θ = ∑Vx∑H
Answer: Option B
10. The above figure shows the two equal forces at right angles acting at a point. The value of force R acting along their bisector and in opposite direction is
A.     P/2
B.     2P
Answer: Option C

Engineering Mechanics Objective Ques-Ans [Part-1]

Engineering Mechanics Objective Questions and Answers

Engineering Mechanics Objective Questions and Answers. Mechanicale Engineering Quiz Questions with Answers. Important and Useful Quiz questions.

1. According to principle of conservation of energy, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.
A.     True
B.     False 
Answer: Option B
2. The friction experienced by a body, when in motion, is known as
A.     rolling friction
B.     dynamic friction
C.     limiting friction
D.     static friction
Answer: Option B
3. Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity v is made to struck the second ball. Both the balls after impact will move with a velocity
A.     v
B.     v/2
C.     v/4
D.     v/8
Answer: Option B
4. The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion.
A.     Agree
B.     Disagree
Answer: Option A
5. The coefficient of restitution for elastic bodies is one.
A.     Correct
B.     Incorrect
Answer: Option B
Coefficient of restitution for elastic bodies is 0 - 1.
Coefficient of restitution for perfect elastic bodies is 1.
6. The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is
A.     sin θ
B.     cos θ
C.     tan θ
D.     cosec θ
Answer: Option A
7. The range of projectile on a downward inclined plane is __________ the range on upward inclined plane for the same velocity of projection and angle of projection.
A.     less than
B.     more than
C.     equal to
Answer: Option B
8. The angle of inclination of a vehicle when moving along a circular path __________ upon its mass.
A.     depends
B.     does not depend
Answer: Option B
 9. A body of weight W is required to move up on rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by(where μ = tanφ = Coefficient of friction between the plane and the body.)
A.     P = W tanα
B.     P = W tan(α + φ)
C.     P = W (sinα + μcosα)
D.     P = W (cosα + μsinα)
Answer: Option C
10. If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is
A.     30°
B.     60°
C.     90°
D.     120°
Answer: Option D

Strength of Materials Questions For Competitive Exams

Strength of Materials Strength of Materials Questions For Competitive Exams

U.P.S.C., S.S.C., I.A.S., B.Sc. Engineering, Diploma and various interviews

  1. The unit of stress in S.I. units is: N/mm square, KN/mm square, N/meter square
  2. Whenever some external system of forces acts on a body, it undergoes some deformation. As the body undergoes some deformation, it sets up some resistance to the deformation. This resistance per unit area to deformation is called: Stress
  3. The unit of strain is: No unit
  4. The deformation per unit length is called: Strain
  5. When a body is subjected to two equal and opposite pushes, as a result of which the body tends to  reduce its length, the stress and strain induced is: compressive
  6. Strain is equal to Change in Length / Actual Length
  7. When a body is subjected to two equal and opposite forces, acting tangentially across the resisting section, as a result of which the body tends to shear off across the section, the stress and strain induced is: Shear Stress, Shear Strain
  8. When a body is subjected to two equal and opposite pulls, as a result of which the body tends to extend in length, the stress and strain induced is: Tensile Stress, Tensile Strain
  9. Hooks law holds good up to Elastic Limit
  10. Proportional Limit, Elastic Limit, Yielding and thereafter Failure
  11. The ratio of linear stress to linear strain: Modulus of Elasticity
  12. The ratio of shear stress to shear strain: Modulus of Rigidity
  13. The unit of modulus of elasticity is same as those of Pressure, Stress, Modulus of Rigidity
  14. Whenever a material is loaded within elastic limit, stress is: directly proportional to strain
  15. When a change in length takes place, the strain is known as Linear Strain
  16. The modulus of elasticity for Mild Steel is approximately equal to 210 KN/mm square
  17. The change in length due to a tensile or compressive force acting on a body is given by PL/AE, where, P is Tensile or compressive force acting on the body, L is original length of the body, A is Cross-Sectional Area of the body,E is Young's modulus of the material of the body
  18. The unit of Young's Modulus is same as that of Stress
  19. Young's Modulus may be defined as the ratio of Linear Stress to Linear Strain
  20. Modulus of Rigidity may be defined as the ratio of: Shear Stress to Shear Strain
  21. Two bars of different materials and same size are subjected to same tensile force. If the bars have unit elongation in the ratio of 2:5, then the ratio of modulus of elasticity of the two materials will be: 5:2
  22. The deformation of a bar under its own weight is: half the deformation if the same body is subjected to direct load equal to the weight of the body.
  23. When a bar of length l and diameter d is rigidly fixed at the upper end and hanging freely, then the total elongation produced in the bar due to its own weight is: w*l square / 2E where W is weight per unit volume of the bar
  24. The length of a conical bar is l, the diameter of the base is d and weight per unit volume is w. It is fixed at its upper end and hanging freely. The elongation of the bar under the action of its own weight will be: w*l square/ 6E
  25. The elongation of a conical bar under its own weight is: one-third that of the prismatic bar of the same length.
  26. Strain rosettes are used to: Measure linear strain
  27. The extension of a circular bar tapering uniformly from diameter d1 at one end to the diameter d2 at the other end, and subjected to an axial pull of P is given by: 4*P*l / pie*E* d1*d2 
  28. The extension of a circular bar tapering uniformly from diameter d1 at one end to the diameter d2 at the other end, and subjected to an axial pull of P is: equal to the extension of a circular bar of diameter 'root under d1*d2' subjected to the same load P.
  29. A bar of length L metres extend by l mm under a tensile force of P, the strain produced in the bar is: 0.001l / L
  30. The ultimate tensile stress of Mild Steel is:  More than the ultimate compressive stress
  31. The shear modulus of most materials with respect to the modulus of elasticity: is less than half
  32. The maximum stress produced in a bar of tapering section is at: Smaller End
  33. A bolt is made a pass through a tube and both of them are tightly fitted with the help of washers and nuts. If the nut is tightened, then: bolt is under tension and tube is under compression
  34. A rod is enclosed centrally in a tube and the assembly is tightened by rigid washers. If the assembly is subjected to a compressive load, then: both rod and tube are under compression
  35. A steel bar of 5 mm is heated from 15-degree celsius to 40-degree Celsius and it is free to expand. The bar will induce: No Stress
  36. When a bar is subjected to a change of temperature and its deformation is prevented, the stress induces in the bar is: Thermal Stress

Better Field - Mechanical or Production Engineering?

Mechanical Engineering vs Production Engineering

Production Engineering is, for the most part, a study program in Mechanical Engineering, with added emphasis on Manufacturing Engineering, Statistics and Industrial Management. All of these topics are also covered in the typical Mechanical Engineering program, albeit to a lesser extent.
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There is no question about which is best both of them are best on it's own way.If you are interested in the field of production methods and it's technical terminologies then you should go for production engineering and if you have interest in learning the production method,thermal properties, fluid properties, mechanics, vibration properties of various engineering items or components also sometimes management of it then you will like mechanical engineering. But let me give you a free advice job market of these branches in India are not good in present scenario unless and until you are from an IIT or an good NIT.

Better Field - Mechanical or Production Engineering

Both are almost same branches except some subject. Both the branches have specialty in manufacturing engineering and machine design. But there is one subject or you can say one side known as thermal science which differentiate them. Thermal science is broad and very interesting branch which consist of several subjects like thermodynamics, heat transfer, refrigeration and air conditioning & power plant engineering.

Those subjects are heart of anything related to temperature and heat. By knowing these subjects one can understand why our skin becomes dry in winter and sweaty in summer. Why we put cotton clothes on forehead of seek person what is reason behind it.

As compared to mechanical branch production have some deep knowledge of manufacturing science but they are far away from the Thermal science which is biggest disadvantage of choosing production engineering.

Explain Safety Concepts in Industries

All about Safety Concepts in Industries

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In all kinds of industries, each shop supervisor is generally assigned the responsibility of safety in his shop regarding the men, machines and materials. Every supervisor in each shop ensures to the top executives in respect of all kinds of the safety matters. He is supposed to incorporate all new safety measures needed in the shop from time to time. 

With the growth in the size of the industry and depending upon the hazardous of industrial processes, a full fledged safety department should be created under the intensive supervision through a safety manager. The safety manager may be given a line position or staff position depending upon the working conditions in the industry. 

Sometimes the responsibility for safety rests on a safety committee formed by the top executives of the organization. A safety committee may consist of executives, supervisors, and shop floor workers. Thus the lower level employees get a channel of communication on safety matters direct to executive level. It is a matter of fact that those organizations which made safety committees had lower record of accidents than those without safety committees. 

Safety committees always motivate all the industrial employees for developing safety consciousness. It acts also as a policy making body on safety matters. To enhance the efficiency of the safety committee, some safety problem may be assigned to safety staff for identifying and implementing safety rules and publicizing them. 

Its members should be asked to go on the shop floor and watch what is being done there till date about the safety measures. It should be asked to report periodically as what improvements have been made and what more can be done for safety aspects in near future for avoiding any mis-happening in the plant. 

Safety committee often organizes safety programs to make industrial persons sufficiently alert for overall safety within the plant. A safety program tends to discover when, where and why accidents occur. It always aims at reducing accidents and the losses associated with them. It begins with the assumption that more work-connected accidents can be prevented. It does not have an end rather it is a continuous process to achieve adequate safety.

It involves providing, safety equipments and special training to employees. It consists of support by top management, appointing a safety officer, engineering a safe plant, processes and operations, educating all industrial employees to work safely, studying and analyzing the accidents to prevent their occurrence in future, holding safety contests, safety weeks etc., and awarding incentives or special prizes to departments which enforces the safety rules and having least number of accidents.

Safety Concepts in Engineering Manner

A safety programme should always include engineering safety at the design and equipment installation stage, education of employees in safe practices, concerns the attitude of employees and management. 

It should motivate all the industrial employees in accident prevention and safety consciousness. It must provide all safety instructions and training essential for the employees to think, act and work safely so that the number of accidents can be minimized. Safety education must give knowledge about safe and unsafe mechanical conditions and personal practices. 

Safety training must involve induction and orientation of new recruits to safety rules and practices, explaining safety function, during their initial job training through efforts made by the first level supervisors. Formulating employee’s safety committees, holding of employee’s safety meeting, display of charts, posters, film etc. are very much essential in each industry for stressing the need to act safely. 

It educates employees to develop their safety consciousness. An industrial worker will usually accept the use of a safety measure if he is convinced of its necessity. Therefore, suitable measures must be adopted to increase the awareness of a need for safety in the environment of work. Such measures are required in an industrial organization to develop safety consciousness among workers or other employees. 

There should be sufficient display of safety posters and films from time to time to remind industrial workers to particular hazards/accidents, providing simple and convenient safety devices, providing time to the worker for setting, removing and replacing any necessary safety devices. All industrial personnel should be asked from the first day to start working to adopt safety measures because an unskilled worker should be familiar fully to work safely. 

A safety committee should manage regular safety programmes that may hold safety competitions. Award and prizes are also to be given to the winners for imparting due respect and recognition to safe workers and create in employees a feeling of pride in safe work. It should elaborate on the safety theme until all the employees are safety conscious. 

It must hold regular safety meetings and stimulates the safety ideas in industrial workers for being more safety conscious. It must ask the shop supervisor to display all the safety aspects near the work centre. It should also mail safety information and sufficient literature pertaining to safety for reading at homes of all the industrial employees. 

It must welcome all safety suggestions. It must mark categorically all accident areas. It must conduct safety training lectures periodically for providing wide publicity to safety aspects for everything including men, machines and materials

Comparison of Product Layout and Functional Layout

Comparison of Line or Product Layout and Process or Functional Layout

S.No. Line or Product Layout Process or Functional Layout
1. In line or product layout, similar machines are arranged according to the sequence of operations required for manufacturing the product. In process or functional layout, similar machines are arranged in one location for manufacturing the product.
2. It leads to transfer lines. It leads to group technology.
3. It is meant for mass production and extremely less job variety It is meant for moderate production and more job variety.
4. Work flow is not smooth in this layout
5. Job movement is very less. Job movement is comparatively more.
6. Full automation in material handling is possible in this layout. Automation in material handling is not effective in this layout.
7. Machine utilization is poor in this layout. Machinery utilization is better in this layout.
8. Capital investment required is more in this layout. Capital investment required is comparatively less in this layout.
9. Inventory requirement is less. Inventory requirement is comparatively more.
10. Breakdown of one machine affects greatly in this layout. Breakdown of one machine does not affect so much in this layout.
11. Production planning and control is easy. Production planning and control is comparatively difficult.
12. Quality of product is not so good. Quality of product quality is better
13. Work flexibility is very less in this layout Work flexibility is more in this layout
14. Space required for same amount of production is less. Space required for same amount of production is comparatively more.
15. Time taken in completion of product is less. Time taken in completion of product is more.

Define Combination Layout

What is combination layout?

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A combination of process and product layouts combines the advantages of both types of layouts. Most of the manufacturing sections are arranged in process layout with manufacturing lines occurring here and there scattered wherever the conditions permit. 

These days, the most of the manufacturing industries have adopted this kind of layout. In this type of layout, a set of machinery or equipment is grouped together in a section, and so on, so that each set or group of machines or equipment is used to perform similar operation s to produce a family of components. 

A combination layout is possible where an item is being made in different types and sizes. In such cases, machinery and manufacturing equipment are arranged in a process layout but a group of a number of similar machines is then arranged in a sequence to manufacture various types and sizes of products. 

In this layout, it is noted that no matter the product varies in size and type, the sequence of operations remain same or similar. This layout is suitable when similar activities are performed together thereby avoiding wasteful time in changing from one unrelated activity to the next. 

It focuses on avoiding unnecessary duplication of an effort. It is preferable for storing and retrieving information changing related to recurring problems thereby reducing the search for understanding information and eliminating the need to solve the problem again. 

It is also useful when a number of items are produced in the same sequence but none of the items is to be produced in bulk and thus no item justifies for an individual and independent production line. There are some merits, demerits and application of this layout which are given as under :


The merits of this type of layout are:

1. Reduction in cost of machine set-up time and material handling of metals.
2. Elimination of excess work-in-process inventory which subsequently allows the reduction in lot size.
3. Simplification of production planning functions, etc.


The major demerits of this layout are :

1. Change of the existing layout is time-consuming and costly.
2. The inclusion of new components in the existing component requires thorough analysis.
3. Change of input component mix may likely to change complete layout structure.
4. Change of batch size may change a number of machines.


Manufacturing circular metal saws, hacksaw, wooden saw, files and crankshaft

Production & Industrial Engineering - Objective Questions with Answers

Objective Question-Answer from Production and Industrial Engineering

Production & Industrial Engineering - Objective Questions with Answers

1. .............activities are the activities for which total float is equal to zero.
(A) Dummy
(C) Critical ✔
(B) Subcritical
(D) Supercritical

2. Layout provides greater flexibility
(A) Product
(B) Process ✔
(C) Fixed position
(D) Group

3. In a shop, heavy jobs are lifted by means of-
(B) Conveyors
(D) Overhead crane ✔
(A) Fork lift
C) Hoists

4. a group incentive plan.
(A) Stanlon plan ✔
(C) Rowan plan
(B) Bedaux plan
(D) None of the above

5. ..chart is not associated with work study.
(A) Gnatt ✔
(C) Multiple activity
(D) None of these

6. One TMU (Time Measurement Unit) equals-
(A) 000001 hours ✔
(B) 000003 hours
(C) 000006 hours
(D) 000008 hours

7. In time study, the rating factor is applied to determine.....
A. standard time of a job
B. merit rating of the worker
C. fixation of incentive rate
D. normal time of a worker ✔

8. ...............plan is a bonus plan in which allowance is determined in terms of time for each unit of output instead of money
(A) Rowan
(C) Group
(B) Bedaux
(D) Hour-for-hour ✔

9. ...................introduced therbligs
(A) Blanket
(C) Cooper
(B) Gilbreath ✔
(D) Adam

10. In .............. production acceptance sampling widely used.
(A) Job
(C) Mass ✔
(B) Batch
(D) All of the above

Define Electric Resistance Welding

About Electric Resistance Welding

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It is used for joining pieces of sheet metal or wire. It is a type of pressure welding. The welding heat is obtained at the location of the desired weld by the electrical resistance through the metal pieces to a relatively short duration, low voltage (from 6 to 10 volts only) high amperes (varying from 60 to 4000 amperes) electric current. 

Other details

The amount of current can be regulated by changing the primary turns of the transformer. When the area to be welded is sufficiently heated, the pressure varying from 25 to 55 MPa is applied to the joining area by suitable electrodes until the weld is solid.

Various types of electric resistance welding are as follows:

  1. Spot welding
  2. Projection welding
  3. Butt welding
  4. Roll spot and seam welding
  5. Carbon Arc welding
  6. Metal Arc welding
  7. Automatic Hydrogen welding
  8. Stud arc welding
  9. Submerged arc welding