MCQs of Gear Design (Machine Design - 2171909)

Machine Design (2171909) MCQs

MCQs of Gear Design

Showing 51 to 60 out of 70 Questions

51.

If m_n is normal module and m is transverse module, then which of the following relation is true?

(a)	$m_{n} = m \times \sin ψ$
(b)	$m_{n} = m \times \cos ψ$
(c)	$m_{n} = \frac{m}{\sin ψ}$
(d)	$m_{n} = \frac{m}{\cos ψ}$

52.

Bevel gears are cut on conical blanks whose pitch surfaces are __________.

(a)	cylinders
(b)	cones
(c)	frustrum of pyramids
(d)	frustrum of cones

53.

The back cone is an imaginary cone the elements of which are perpendicular to the elements of the pitch cone at _________.

(a)	any end of the tooth
(b)	the pitch line of the tooth
(c)	the smaller end of the tooth
(d)	the larger end of the tooth

54.

For a bevel gear pair, if $r_{1}$ and $r_{2}$ are pitch circle radius of pinion and gear respectively, the length of the pitch cone element can be given by ______.

(a)	$L = r_{1} + r_{2}$
(b)	$L = r_{1} - r_{2}$
(c)	$L = \sqrt{r_{1}^{2} - r_{2}^{2}}$
(d)	$L = \sqrt{r_{1}^{2} + r_{2}^{2}}$

55.

The virtual number of teeth of a bevel gear can be expressed as ______.

(a)	$z' = \frac{z}{\sin γ}$
(b)	$z' = \frac{z}{\cos γ}$
(c)	$z' = \frac{z}{\tan γ}$
(d)	$z' = \frac{z}{\log γ}$

56.

From the following, which material is most widely used for worm gear?

(a)	Cast steel
(b)	Copper
(c)	Phosphor bronze
(d)	Cast iron

57.

Which of the following is a widely used face type for heavy-duty purposes in worm gears?

(a)	Straight face
(b)	Hobbed straight face
(c)	Convex face
(d)	Concave face

58.

Which of the following is not true for worm gears?

(a)	High speed ratio with a single worm drive pair is possible
(b)	Smooth and silent operation
(c)	Self-locking operation provision is possible
(d)	Worm drives have high efficiency

59.

A pair of worm gears is specified and designated by four quantities in the following manner: z₁/z₂/q/m. What is q in these specifications?

(a)	Radial quotient
(b)	Diametral quotient
(c)	Lead angle
(d)	Pitch angle

60.

If d is the pitch circle diameter of the worm and m is the module, the diametral quotient is given by ________.

(a)	$q = d \times m$
(b)	$q = \frac{d \times m}{2}$
(c)	$q = \frac{d}{m}$
(d)	$q = \frac{d}{2 m}$

Showing 51 to 60 out of 70 Questions