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Mechanical Interview Questions 6 contains questions about Yield and Ultimate tensile strength,  Flexural strength, Tensile strength, Shear and Tensile strength, Tensile strength, Tensile modulus, Curve used in Gear, Bearing stress, materials used for Sliding Wear pad, Shaper machine, Planner machine.

51. What is the difference between Yield and Ultimate tensile strength?

52. What is the difference between Flexural strength and Tensile strength?

53. What is the difference between Shear and Tensile strength?

54. What is the difference between Tensile strength and Tensile modulus?

55. What is OEE?

56. Why Involutes Curve used in Gear?

57. What is Bearing stress?

58. Which is hard material Cast Iron or Mild Steel?

59. What are the materials used for Sliding Wear pad?

60. What is the difference between a Shaper machine and a Planner machine?

51. What is the difference between Yield and Ultimate tensile strength?

The yield strength is reached when the material becomes Non – linear (that is non elastic) and takes a permanent set when load is released.

Material stretches but does not break. Ultimate strength is when it breaks and is higher than yield strength.

52. What is the difference between Flexural strength and Tensile strength?

Flexural strength is resistance offered against bending. Tensile strength is resistance offered against tensile force.

53. What is the difference between Shear and Tensile strength?

Tensile Strength for a Bolt is determined by applying a Force along it long axis.

Shear Strength for a Bolt is determined by applying a Force across its diameter, as it would be loaded in a lug joint.

Tensile strength is strength in tension when pulling force is applied. And shear strength is strength against cutting force which is known as shear force.

54. What is the difference between Tensile strength and Tensile modulus?

Tensile strength is the ultimate capacity of the material to resist a tensile load regardless of deflection.

Tensile modulus also known as Young’s modulus is a measure of the stiffness of an isotropic elastic material.

It is defined as the ratio of the uni-axial stress over the uni-axial strain. It is determined from the slope of a stress-strain curve traced during tensile tests conducted on a sample of the material.

55. What is OEE?

OEE means Overall Equipment Effectiveness. This terminology widely used in Total productive maintenance, which is used to calculate the effectiveness of machines in manufacturing. Basically it captures the losses of machines in production and try to improve defects on machines. Higher the OEE, more capable is the machine.

56. Why Involutes Curve used in Gear?

Involute curve is the path traced by a point on a line as the line rolls without slipping on the circumference of a circle.

Involute curve has a contact angle between two gears when the tangents of two gears pass through the contact point without friction.

57. What is Bearing stress?

The stress which acts on the contact surface area between two members is known as Bearing stress. An example for this is the stress between nut and the washer.

58. Which is hard material Cast Iron or Mild Steel?

Cast iron. Due to the excess carbon content than mild steel it is harder. The more carbon content, the more hardness will be.

But it reduces the weldability due to this hardness. It is brittle too.

59. What are the materials used for Sliding Wear pad?

1. Urethane-Coated Base Material Provides Optimum Sliding Surfaces for Maximum Wear Ability

2. Galvanized Steel for Backing on Head and Side Pads

3. For crane services, We use Velcro Nylon wearing pad

60. What is the difference between a Shaper machine and a Planner machine?

In Shaper machine tool is having reciprocating motion and work piece is clamped on table which is stationary.

It is mostly suitable for light duty operation.In Shaping large cutting force is transferred to tool.

In Planer machine tool is having stationary and work piece is clamped on table which is reciprocating motion. It is mostly suitable for Heavy duty operation. In planner large cutting force is transferred to table.