Deck 6: Mechanical Engineering Gears, Lubrication, Welding, Stress, and Design

Question 1

Crown gears having a pitch angle of 90?

A)=90
B)<90
C)>90
D)none of the listed

Answer 1

>90

Question 2

Which of the following are characteristics of skew bevel gears?

A)straight teeth
B)mounted on parallel shafts
C)mounted on intersecting shafts
D)all of the mentioned

Answer 2

straight teeth

Question 3

Hypoid gears are based on surfaces that are paraboloids of revolution.

Answer 3

False

Question 4

When two hyperboloids are rotated, the resulting motion is

A)sliding
B)turning
C)combination of turning and sliding
D)rotary

Question 5

Zerol gears are straight bevel gears with zero spiral angle.

Question 6

Zerol gears give lesser contact ratio.

A)true
B)no, larger contact ratio
C)zero contact
D)none of the listed

Question 7

The fundamental equation for viscous flow is given by ?pbh?/6µl where symbols have their usual meanings.

A)6 is to be replaced by 3
B)6 is to be replaced by 12
C)6 is to be replaced by 9
D)6 is to be replaced by 15

Question 8

A single transverse weld is preferred over

Question 9

Transverse fillet weld can be designed using the same equations as of parallel fillet weld.

Question 10

Which of the following are functions of bearings?

A)ensure free rotation of shaft with minimum friction
B)holding shaft in a correct position
C)transmit the force of the shaft to the frame
D)all of the listed

Question 11

Which of the following is measure of stiffness?

A)modulus of elasticity
B)modulus of plasticity
C)resilience
D)toughness

Question 12

Which of the following facts are true for resilience?

A)ability of material to absorb energy when deformed elastically
B)ability to retain deformation under the application of load or after removal of load
C)ability of material to absorb energy when deformed plastically
D)none of the mentioned

Question 13

Shot blasting process improves the endurance limit of the component.

Question 14

While designing a forging, the profile is selected such that the fibrous lines are parallel to the tensile forces and perpendicular to shear forces.

Question 15

What is the expression of the bending equation?

A)m/i = ?/y = e/r
B)m/r = ?/y = e/i
C)m/y = ?/r = e/i
D)m/i = ?/r = e/y

Question 16

The bending stress is_______            

A)directly proportional to the distance of layer from the neutral layer
B)inversely proportional to the distance of layer from the neutral layer
C)directly proportional to the neutral layer
D)does not depend on the distance of layer from the neutral layer

Question 17

The critical value at which crack extension occurs is called

A)stress intensity factor
B)toughness
C)fracture toughness
D)none of the mentioned

Question 18

If for a curved beam of trapezoidal cross section, radius of neutral axis is 89.1816mm and radius of centroidal axis is 100mm, then find the bending stress at inner fibre whose radius is 50mm. Area of cross section of beam is 7200mm² and the beam is loaded with 100kN of load.

A)97.3
B)95.8
C)100.6
D)none of the mentioned

Question 19

Which of the following can be the factor of safety for a dead load?

A)6
B)2
C)4
D)7

Question 20

For which of the following design factor of safety the design will work properly?

A)0.1
B)1
C)2
D)0.9

Question 21

While designing shaft on the basis of torsional rigidity, angle of twist is given by?

A)ml/gd?
B)584ml/gd?
C)292 ml/gd?
D)none of the mentioned