MCQs of Gear Design (Machine Design - 2171909)

Machine Design (2171909) MCQs

MCQs of Gear Design

Showing 61 to 60 out of 70 Questions

61.

In worm gears, the sum of the helix angle and lead angle is ______.

(a)	30°
(b)	45°
(c)	60°
(d)	90°

62.

The efficiency of worm gears can be given by ______.

(a)	$η = \frac{μ \cos (α) - \tan (γ)}{μ \cos (α) + \cot (γ)}$
(b)	$η = \frac{μ \cos (α) + \tan (γ)}{μ \cos (α) - \cot (γ)}$
(c)	$η = \frac{\cos (α) - μ \tan (γ)}{\cos (α) + μ \cot (γ)}$
(d)	$η = \frac{\cos (α) + μ \tan (γ)}{\cos (α) - μ \cot (γ)}$

63.

When bevel gears having equal teeth and equal pitch angles connect two shafts whose axes intersect at the right angle, then they are known as ______.

(a)	angular bevel gears
(b)	crown bevel gears
(c)	internal bevel gears
(d)	mitre gears

64.

The face angle of a bevel gear is equal to _______.

(a)	pitch angle – addendum angle
(b)	pitch angle + addendum angle
(c)	pitch angle – dedendum angle
(d)	pitch angle + dedendum angle

65.

The root angle of a bevel gear is equal to ______.

(a)	pitch angle – addendum angle
(b)	pitch angle + addendum angle
(c)	pitch angle – dedendum angle
(d)	pitch angle + dedendum angle

66.

If b denotes the face width and L denotes the cone distance, then the bevel factor is written as _______.

(a)	$\frac{b}{L}$
(b)	$\frac{b}{2 L}$
(c)	$1 - 2 bL$
(d)	$1 - \frac{b}{L}$

67.

In worm gears, the angle between the tangent to the thread helix on the pitch cylinder and the plane normal to the axis of the worm is called _______.

(a)	pressure angle
(b)	lead angle
(c)	helix angle
(d)	friction angle

68.

The number of starts on the worm for a velocity ratio of 40 should be __________.

(a)	single
(b)	double
(c)	triple
(d)	quadruple

69.

If P is power transmitted (in watts) and η is the efficiency of the worm gearing, then power lost in friction (in watts) is given by _________.

(a)	$Q_{g} = \frac{(η - 1)}{P}$
(b)	$Q_{g} = \frac{(1 - η)}{P}$
(c)	$Q_{g} = (η - 1) \times P$
(d)	$Q_{g} = (1 - η) \times P$

70.

The heat-dissipating capacity of a worm drive can be given by ________.

(a)	$Q_{d} = A \times (t_{2} - t_{1}) \times K$
(b)	$Q_{d} = \frac{A \times K}{(t_{2} - t_{1})}$
(c)	$Q_{d} = \frac{A \times (t_{2} - t_{1})}{K}$
(d)	$Q_{d} = \frac{K \times (t_{2} - t_{1})}{A}$

Showing 61 to 60 out of 70 Questions