Practice Test: Question Set - 34
1. The ball bearings are provided with a cage
- (A) To
reduce friction
- (B) To
facilitate slipping of balls
- (C) To
prevent the lubricant from flowing out
- (D) To
maintain the balls at a fixed distance apart
2. A single strap butt joint is always in __________ shear.
- (A) Single
- (B) Double
- (C) Triple share
- (D) None of
these
3. The cam follower extensively used in aircraft engines is
- (A) Knife
edge follower
- (B) Flat faced
follower
- (C) Spherical
faced follower
- (D) Roller
follower
4. The shear stress in a beam varies from zero at the outer fibers to a maximum at the________.
- (A) Neutral
surface
- (B) Upper
surface
- (C) Lower
surface
- (D) None of
these
5. In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called
- (A) Normal pitch
- (B) Axial pitch
- (C) Diametral
pitch
- (D) Module
6. The velocity factor for precision metallic gears cut with high accuracy and operating at velocities up to 20 m/s is equal to
- (A) 0.75/ (0.75
+ √v)
- (B) 3/ (3
+ v)
- (C) 4.5/ (4.5
+ v)
- (D) 6/ (6 + v)
7. In case of pressure vessels having open ends, the fluid pressure induces
- (A) Longitudinal
stress
- (B) Circumferential
stress
- (C) Shear stress
- (D) None of
these
8. When the bolt is very yielding as compared to the connected members, then the resultant load on the bolt will be equal to the
- (A) Initial
tension
- (B) External
load applied
- (C) Sum of the
initial tension and external load applied
- (D) Initial
tension or external load, whichever is greater
9. The value of Lewis form factor used in design of gears is
- (A) Dependent on
number of teeth of a gear
- (B) Dependent on
system of teeth
- (C) Independent
of size of teeth
- (D) All of these
10. Factor of safety for fatigue loading is the ratio of
- (A) Elastic
limit to the working stress
- (B) Elastic
limit to the yield point
- (C) Endurance
limit to the working stress
- (D) Young's
modulus to the ultimate tensile strength
11. If T is the actual number of teeth on a helical gear and φ is the helix angle for the teeth, then formative number of teeth is written as
- (A) T sec3φ
- (B) T sec²φ
- (C) T/sec3φ
- (D) T cosecφ
12. The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called
- (A) Repeated
stress
- (B) Yield stress
- (C) Fluctuating
stress
- (D) Alternating
stress
13. A screw is said to be a self locking screw, if its efficiency is
- (A) Less than 50%
- (B) More than
50%
- (C) Equal to 50%
- (D) None of
these
14. In designing a key, it is assumed that the distribution of forces along the length of key
- (A) Varies
linearly
- (B) Is uniform
throughout
- (C) Varies
exponentially, being more at the torque-input end
- (D) Varies
exponentially, being less at the torque-input end
15. The design of the pressure vessel is based on
- (A) Longitudinal
stress
- (B) Hoop stress
- (C) Longitudinal
and hoop stress
- (D) None of
these
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