# Practice Test: Question Set - 05

**1. All dimensions for a standard gear system can be defined in terms of,**

- (A) Module
and number of teeth

- (B) Pressure
angle and number of teeth

- (C) Module

- (D) Circular
and diametral pitch

**2. The curve traced by a point on a line as it rolls on a circle is called**

- (A) Cycloid

- (B) Epicycloid

- (C) Involute

- (D) Hypocycloid

**3. Spur gears used for machine tool gearboxes must have the contact ratio**

- (A) Equal to 1

- (B) Less than 1

- (C) More than
1.4

- (D) Equal to 2

**4. The pitch circle diameter and number of teeth in a spur gear are d’ and z respectively. The module m is defined as**

- (A) Ï€

*d*’/

*z*

- (B)

*z*/

*d*’

- (C)

*d*’/

*z*

- (D)

*d*’

*z*

**5. Which of the following gear ratios does not require hunting tooth?**

- (A) 52:26

- (B) 48:24

- (C) 50:25

- (D) 51:25

**6. In case of spur gears, Lewis form factor depends upon**

- (A) Module

- (B) Number of
teeth

- (C) Pressure
angle

- (D) Both (B) and
(C)

**7. Permissible bending stress for gear tooth is usually taken as**

- (A) One third of
ultimate tensile strength

- (B) One half of
ultimate tensile strength

- (C) One third of
tensile yield strength

- (D) One third of
surface endurance strength

**8. Wear strength of gear tooth should be**

- (A) Less than effective
load consisting of static and dynamic load

- (B) More
than effective load consisting of static and dynamic load

- (C) More
than wear strength of gear tooth

- (D) More
than load due to power transmission

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