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Top 47 Machine Design Interview Questions

Q1. A Wire Rope Is Designated As 6 X 19 Standard Hoisting. What Do The Numbers 6 X 19 Represent?

Number of strands x number of wires in every strand.

Q2. While Taking A Turn, What Action Differential Makes?

An boom inside the pace of the outer wheel.

Q3. What Are The Factors That Affect Notch Sensitivity?

The elements effecting notch sensitivity are:

Material

Notch radius

Size of issue

Type of loading

Grain Structure

Q4. What Are The Factors To Be Considered In The Selection Of Materials For A Machine Element?

While choosing a material for a gadget element, the subsequent elements are to be considered

Required cloth residences

Manufacturing ease

Material availability

Cost

Q5. What Are The Factors Affecting Endurance Strength?

Factors affecting staying power energy are

Load ii. Surface end

Size

Temperature

Impact

Reliability

Q6. Explain Size Factor In Endurance Strength?

Size thing is used to don't forget the impact of the dimensions on patience strength. A large size item could have extra defects as compared to a small one. So, persistence strength is decreased. If K is the size aspect, then

Actual staying power energy = Theoretical endurance restrict x K

Q7. What Are The Modes Of Fracture?

The special the modes of fractures are:

Mode I (Opening mode) – Displacement is everyday to crack surface.

Mode II (Sliding mode) – Displacement is inside the plane of the plate.

Mode III (Tearing mode) – Out of plane shear.

Q8. How The Size Of The Gearis Usually Specified?

By pitch circle diameter.

Q9. Define Ductility?

It is the assets of the fabric permitting it to be drawn into twine, with the application of tensile force. It should be each strong and plastic. It is usually measured in terms of percentage elongation and reduction in vicinity, (e.G.) Ni, Al, and Cu.

Q10. What Is Endurance Limit?

Endurance restrict or fatigue restrict is the most pressure that a member can with stand for an limitless range of load programs with out failure when subjected to absolutely reversed loading.

Q11. Differentiate Between Repeated Stress And Reversed Stress?

Repeated strain refers to a strain varying from 0 to a maximum price of identical nature.

Reversed strain of cyclic strain varies from one price of anxiety to the identical price of compression.

Q12. What Are The Types Of Variable Stresses?

Types of variable stresses are:

Completely reversed or cyclic stresses

Fluctuating stresses

Repeated stresses

Q13. In Designing A Clutch Plate, What Assumption Is Made?

Uniform wear situation is assumed as it leads to more secure design.

Q14. What Are The Common Profiles Used For Splines In Machine Elements?

The profiles used for splines in system elements are immediately sided splines, triangular splines and in volute splines.

Q15. What Is The Empirical Formula Used To Give The Number Of Bolts In Flange Coupling?

N = zero.2nd + three

Q16. Distinguish Between Brittle Fracture And Ductile Fracture?

In brittle fracture, crack increase is up to a small depth of the cloth.

In ductile fracture big amount of plastic deformation is present to a higher intensity.

Q17. How Computer Helps In Designing?

Computer is capable of shop lot of facts and identical can be retrieved rapid.

It performs calculations very rapid. The layout may be visualized on display screen and any changes made and its outcomes clearly visible. Thus premier designs can be executed lots faster and these are thoroughly examined from all angles.

Q18. Why Slenderness Ratio Is Considered In Design Of Members?

When period of the member is multiplied, the member may additionally fail because of buckling even though the member is symmetrical in all respects and the weight is concentric.

Q19. What Is Impact Load?

If the time of load software is much less than one 1/3 of the lowest natural period of vibration of the element, it's far called an effect load.

Q20. Give Some Methods Of Reducing Stress Concentration?

Some of the techniques are:

Avoiding sharp corners.

Providing fillets.

Use of more than one holes rather than single hole

Undercutting the shoulder elements.

Q21. List Out The Factors Involved In Arriving At Factor Of Safety?

The factors worried in arriving at element of protection are:

Material homes

Nature of loads

Presence of localized stresses

Mode of screw ups

Q22. What Are Various Theories Of Failure?

The failure theories are:

Maximum main pressure theory.

Maximum shear strain theory.

Maximum principal pressure concept.

Q23. What Are The Various Phases Of Design Process?

The diverse phases of layout procedure are:

Recognition of need.

Definition of trouble

Synthesis

Analysis and optimization

Evaluation

Presentation

Q24. What Is The Constant Factor In Case Of R-10 Series Of Preferred Numbers?

1.25

Q25. Define Stress Concentration And Stress Concentration Factor?

Stress concentration is the growth in nearby stresses at factors of fast trade in move segment or discontinuities.

Stress awareness component is the ratio of maximum stress at important phase to the nominal stress.

Q26. Why A Sleeve Is Fitted On A Ball Bearing?

To prevent relative axial movement between the shaft and the bearing.

Q27. Explain Notch Sensitivity. State The Relation Between Stress Concentration Factor And Notch Sensitivity?

Notch sensitivity (q) is the degree to which the theoretical effect of stress attention is in reality reached.

The relation is, Kf = 1 + q (Kt-1)

Q28. Define Endurance Limit?

Endurance restrict is the maximum price of completely reversed pressure that the usual specimen can sustain an countless number (106) of cycles without failure.

Q29. What Do You Mean By Allowance In Limits And Fits?

Allowance in limits and suits refers to most clearance among shaft and hole.

Q30. Define Fatigue?

When a cloth is subjected to repeated pressure, it fails at stresses beneath the yield factor pressure; such type of failure of the cloth is referred to as fatigue.

Q31. What Is The Main Purpose Of A Gear Box In A Vehicle?

To range the torque at the street automobiles.

Q32. Give Some Example For Curved Beam?

C body, crane hook.

Q33. Define Mach Inability?

It is the belongings of the cloth, which refers to a relative ease with which a cloth may be cut. It is measured in some of approaches together with comparing the tool lifestyles for slicing extraordinary material.

Q34. Explain Griffith Theory. (or) State The Condition For Crack Growth?

A crack can propagate if the strength launch fee of crack is greater than crack resistance.

Q35. Can You Tell Something About Hazop Study?

In Hazop (Hazards and operatibility) take a look at every and every attainable procedure deviation from regular working situation of a device having identical layout intention, is thoroughly analysed for causes and outcome and required motion plan to mitigate threat/operability issues are recommended on the idea of available shielding gadget.

Q36. What Is An S-n Curve?

N curve has fatigue strain on ‘Y’ axis and range of loading cycles in ‘X’ axis. It is used to discover the fatigue strain price corresponding to a given range of cycles.

Q37. What Type Of Threads Are Used For Pressure Tight Joints And For Power Trmission?

Pipe threads are used for pressure tight joints and rectangular threads for energy trmission.

Q38. A Bench Vice Has Which Type Of Thread?

ACME

Q39. On What Basis A Trmission Shaft Subjected To Bending Loads Must Be Designed?

Maximum shear pressure principle.

Q40. What Is Curved Beam?

In curved beam the neutral axis does not coincide with the centroidal axis.

Q41. The Critical Speed Of Rotating Shaft Depends Upon What?

Mass and stiffness.

Q42. For Tight Leakage Joints, Which Type Of Thread Is Best Suited?

NPT( National Pipe Threads)