MCQs of Gear Design (Machine Design - 2171909)

Machine Design (2171909) MCQs

MCQs of Gear Design

Showing 41 to 50 out of 70 Questions

41.

The permissible bending stress in the Lewis equation is taken as _____ of the ultimate tensile strength.

(a)	${\frac{2}{3}}^{r d}$
(b)	${\frac{3}{4}}^{t h}$
(c)	${\frac{1}{3}}^{r d}$
(d)	${\frac{1}{4}}^{t h}$

42.

The failure of the gear tooth due to pitting occurs when the ________ stresses between two meshing teeth exceed the surface endurance strength of the material.

(a)	tensile
(b)	compressive
(c)	bending
(d)	Hertz's contact

43.

Which of the following is not a surface destruction type gear tooth failure?

(a)	Abrasive wear
(b)	Corrosive wear
(c)	Scoring
(d)	Breakage of Tooth

44.

The extreme pressure (EP) additives present in the lubricating oils can cause _______ of the gear.

(a)	abrasive wear
(b)	corrosive wear
(c)	scoring
(d)	pitting

45.

Which of the following is a type of fatigue failure of the gear tooth?

(a)	Abrasive wear
(b)	Corrosive wear
(c)	Scoring
(d)	Pitting

46.

Which of the following type of gear tooth failure is caused due to incorrect alignment of gears?

(a)	Scoring
(b)	Pitting
(c)	Abrasive wear
(d)	Corrosive wear

47.

________is a stick-slip phenomenon, in which alternate welding and shearing take place rapidly at the high spots.

(a)	Scoring
(b)	Pitting
(c)	Corrosive wear
(d)	Abrasive wear

48.

Helical gears impose ______ load on shafts during power transmission.

(a)	radial
(b)	axial thrust
(c)	radial and axial thrust
(d)	no

49.

Normal circular pitch is the distance between corresponding points of adjacent teeth as measured in ___________.

(a)	a plane perpendicular to the shaft axis
(b)	a plane perpendicular to the teeth elements
(c)	the plane of rotation
(d)	a plane parallel to the shaft axis

50.

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

(a)	$z' = \frac{z}{\cos^{2} ψ}$
(b)	$z' = \frac{z}{\cos^{3} ψ}$
(c)	$z' = \frac{z}{\sin^{3} ψ}$
(d)	$z' = \frac{z}{\sin^{2} ψ}$

Showing 41 to 50 out of 70 Questions