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This mock test of Test: Gears - 1 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam.
This contains 10 Multiple Choice Questions for Mechanical Engineering Test: Gears - 1 (mcq) to study with solutions a complete question bank.
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QUESTION: 1

The gears are termed as medium velocity gears, if their peripheral velocity is

Solution:

QUESTION: 2

Two mating spur gears have 70 and 30 teeth respectively. Corresponding to module pitch 6 mm, the center to center distance between gears will be

Solution:

QUESTION: 3

Spot the wrong relation:

Solution:

QUESTION: 4

Which aspect is not true for a stub tooth when compared to full depth system?

Solution:

The interfering portion of the tooth, which is a part of addendum, is removed in stub tooth profile because stub involute system have shorter addendum and dedendum.

QUESTION: 5

Lewis equation in spur gears is applied

Solution:

The amount of force that can be transmitted to a gear tooth is a function of the S_{o}y product as shown by the Lewis equation. For two mating gears, the weaker will have the smaller S_{0}y value. When two mating gears are to be made of .the same material, the smaller gear (pinion) will be the weaker and control design.

QUESTION: 6

Allowable tooth stress for gear-tooth design depends upon the following parameters:

1. Type of gear material

2. Pitch line velocity

3. Beam strength of gear teeth

Which of the above is/are valid?

Solution:

Allowable stress,

where,

σ_{0} is the endurance strength of material

C_{v} is the velocity factor

QUESTION: 7

The tooth profiles must not have excessive contact stress as determined by the wear load to insure durability of a gear pair. This wear load is obtained using

Solution:

Buckingham equation,

where,

W_{w} = Maximum or limiting load for wear, N

D_{p} = PCD, mm

b = face width of the pinion , mm

Q = Ratio Factor

K = Load-stress factor or material combination factor, N/mm^{2}

where,

QUESTION: 8

A pair of straight teeth spur gears with 6 mm module, having 20° involute full depth teeth is to transmit 12 kW at 300 rpm of the pinion. The speed ratio is 3:1. The allowable static stresses for gear of cast irion and pinion of steel are 60 MPa and 105 MPa respectively.

Assume the following:

Number of teeth on pinion = 16;

Face width = 14 m;

σ_{es} - 600 MPa; E_{p} = 200 GPa; E_{G} = 100 GPa; Service factor, C_{s} = 1; sin20° = 0.342.

Based on these design data, match the followings:

Solution:

Pitch line velocity

Load stress factor

Limiting wear load,

QUESTION: 9

The backlash for spur gears depends upon

Solution:

QUESTION: 10

Cycloidal tooth profile of a cycloidal gear tooth is a combination of

Solution:

Cycloidal tooth is made of two curves- hypocycloid curve below the pitch circle and epicycloid curve above the pitch curve.

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