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Test: Toothed Gearing - 3 - Mechanical Engineering MCQ


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20 Questions MCQ Test - Test: Toothed Gearing - 3

Test: Toothed Gearing - 3 for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Test: Toothed Gearing - 3 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Toothed Gearing - 3 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Toothed Gearing - 3 below.
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Test: Toothed Gearing - 3 - Question 1

Large pressure angle of the gear results in

Test: Toothed Gearing - 3 - Question 2

In the case of an involute toothed gear, involute starts from

Detailed Solution for Test: Toothed Gearing - 3 - Question 2

In case of involute toothed gear base circle is the circle above which profile of gear is involute and below the base circle straight line exists. Hence it is the base circle.

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Test: Toothed Gearing - 3 - Question 3

A rack is a gear of infinite

Detailed Solution for Test: Toothed Gearing - 3 - Question 3

Rack is defined as a gear of infinite diameter.

Test: Toothed Gearing - 3 - Question 4

The stub tooth is

Detailed Solution for Test: Toothed Gearing - 3 - Question 4

20° stub involute system have following features:

  • Shorter addendum and shorter dedendum
  • Smaller interference as compared to full depth involute
  • Drive is more compact
  • Stronger than full depth involute teeth
  • Lower production cost as less metal must be cut away

The main draw back of this system is that the contact ratio is reduced due to shorter addendum.

Test: Toothed Gearing - 3 - Question 5

When two spur gears having involute profiles on their teeth engaged, the line of action is tangential to the

Detailed Solution for Test: Toothed Gearing - 3 - Question 5

Two important properties of an involute
(i) A normal to an involute is a tangent to the basic circle
(ii) The radius of curvature of an involute is equal to the length of the tangent to the base circle.

Test: Toothed Gearing - 3 - Question 6

For a cycloidal tooth profile, pressure angle at
I. Commencement of engagement
II. Pitch point and
III. At the end of engagement will be

Detailed Solution for Test: Toothed Gearing - 3 - Question 6

For a cycloidal tooth profile pressure angle is zero at the pitch point and becomes maximum during the engagement and disengagement.

Test: Toothed Gearing - 3 - Question 7

In gear drive, standard addendum equals

Detailed Solution for Test: Toothed Gearing - 3 - Question 7

In standard
Addendum = 1 module

Test: Toothed Gearing - 3 - Question 8

Common contact ratio of a pair of spur pinion

Detailed Solution for Test: Toothed Gearing - 3 - Question 8

Contract ratio of a pair of spur pinion and gear is usually more than 1.
Here appropriate answer is (c).

Test: Toothed Gearing - 3 - Question 9

The difference between addendum and dedendum is known as

Detailed Solution for Test: Toothed Gearing - 3 - Question 9


Clearance is the amount by which the dedendum of a gear exceeds the addendum of its mating tooth.

Test: Toothed Gearing - 3 - Question 10

The difference between space width and tooth thickness is

Detailed Solution for Test: Toothed Gearing - 3 - Question 10


Backlash is defined as the amount by which the width of tooth space exceeds the thickness of the engagement tooth measured along the pitch circle.

Test: Toothed Gearing - 3 - Question 11

Ratio of pitch circle diameter in millimeters to the number of teeth is known as

Detailed Solution for Test: Toothed Gearing - 3 - Question 11

Module  = D/T
where
D = Pitch circle diameter
T = Number of teeth

Test: Toothed Gearing - 3 - Question 12

In case of a gear pair with involute tooth profile, the pressure angle through out the contact is

Detailed Solution for Test: Toothed Gearing - 3 - Question 12

In involute profile of gear teeth pressure angle is constant throughout the engagement of teeth. This results in smooth running of the gear.

Test: Toothed Gearing - 3 - Question 13

Match List - I (Terms) with List - II (Definitions) and select the correct answer using the codes given below the lists:
List-I
A. Module
B. Addendum
C. Circular pitch
List-II
1. Radial distance of a tooth from the pitch circle to the top of the tooth
2. Radial distance of a tooth from the pitch circle to the bottom of the tooth
3. Distance on the circumference of the pitch circle from a point of one tooth to the corresponding point on the next tooth
4. Ratio of pitch circle diameter in mm to the number of teeth
Codes:
     A B C
(a) 4 1 3
(b) 4 2 3
(c) 3 1 2
(d) 3 2 4

Detailed Solution for Test: Toothed Gearing - 3 - Question 13

Module: It is the ratio of the pitch circle diameter to the number of teeth. It is usually denoted by m. Mathematically.
Module, m = D/T
Addendum: The addendum is the radial distance between pitch and the addendum circles. Addendum indicates the height of tooth above the pitch circle.
Circular Pitch: It is the distance measured on the circumference of the pitch circle from a point of one tooth to the corresponding point on the next tooth . It is usually denoted by pc.
Mathematically,
Circular pitch
pc = πD/T
where D = Diameter of the pitch circle,
and T = Number of teeth on the wheel

Test: Toothed Gearing - 3 - Question 14

Which one of the following is the correct statement?

The consequence of a slight increase in the centre distance between two mating involute gears is that.

Detailed Solution for Test: Toothed Gearing - 3 - Question 14

Interference in involute gear can be avoided by increasing the centre distance. Interference can also be eliminated by increasing the pressure angle.

Test: Toothed Gearing - 3 - Question 15

If an imaginary circle is drawn which- by pure rolling action gives the same motion as the actual gear, what is the circle called?

Detailed Solution for Test: Toothed Gearing - 3 - Question 15

Pitch Circle: The pitch circle is the curve of intersection of the pitch surface of revolution and the plane of rotation. It is an imaginary circle that rolls without slipping with the pitch circle of a mating gear. The pitch circles of a pair of mating gears are tangent to each other.

Test: Toothed Gearing - 3 - Question 16

How does the contact ratio of helical gears compare with that of spur gears?

Detailed Solution for Test: Toothed Gearing - 3 - Question 16

Helical gears typically provide a higher contact ratio than spur gears. This is due to the additional axial contact ratio resulting from their angled teeth, keeping more teeth in contact at the mesh point for a longer duration.

Test: Toothed Gearing - 3 - Question 17

Match the items in columns I and II.
Column-I
P. Addendum
Q. Instantaneous center of velocity
R. Section modulus
S. Prime circle
Column-ll
1. Cam
2. Beam
3. Linkage
4. Gear

Test: Toothed Gearing - 3 - Question 18

Tooth interference in an external involute spur gear pair can be reduced by

Test: Toothed Gearing - 3 - Question 19

Two involute gears of 20° pressure angle are in mesh. The number of teeth on pinion is 20 and gear ratio is 2. If the module is 5 mm and pitch line speed is 1.2 m/s, (Assume addendum as standard and equal to one module). Then angle turned through the pinion when one pair of teeth is in mesh, will be

Detailed Solution for Test: Toothed Gearing - 3 - Question 19


Test: Toothed Gearing - 3 - Question 20

The arrangement is called bevel gearing, when two shafts are

Detailed Solution for Test: Toothed Gearing - 3 - Question 20

To have a gear drive between two intersecting shafts bevel gears are used.

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