Practice Test: Question Set - 18
1. The form factor of a helical gear __________ with the increase in the helix angle.
- (A) Increases
- (B) Decreases
- (C) Remains
constant
- (D) None of
these
2. For a bevel gear having the pitch angle θ, the ratio of formative number of teeth (TE) to actual number of teeth (T) is
- (A) 1/sinθ
- (B) 1/cosθ
- (C) 1/tanθ
- (D) sinθ cosθ
3. Which of the following has threads at both ends?
- (A) Bolt
- (B) Tap bolt
- (C) Stud
- (D) None of
these
4. The connecting rod bolts are tightened up so that tightening stress
- (A) Is just sufficient to hold
parts together
- (B) Approaches yield point
- (C) Is 50% of yield point
- (D) Is about yield point divided
by safety factor
5. The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be
- (A) εc + 2εl
- (B) 2εc + εl
- (C) εc + εl²
- (D) εc² + εl
6. The material used for brake lining should have __________ coefficient of friction.
- (A) Low
- (B) High
- (C) Moderate
- (D) None of
these
7. 18/8 steel contains
- (A) 18% nickel
and 8% chromium
- (B) 18% chromium
and 8% nickel
- (C) 18% nickel
and 8% vanadium
- (D) 18% vanadium
and 8% nickel
8. Which of the following spring is used in mechanical wrist watch?
- (A) Helical
compression spring
- (B) Spiral
spring
- (C) Torsion
spring
- (D) Belleville
spring
9. The effective stress in wire ropes during normal working is equal to the stress due to
- (A) Axial load
plus stress due to bending
- (B) Acceleration/retardation
of masses plus stress due to bending
- (C) Axial
load plus stress due to acceleration/retardation
- (D) Bending plus
stress due to acceleration/retardation
10. In levers, leverage is the ratio of
- (A) Load lifted
to the effort applied
- (B) Mechanical
advantage to the velocity ratio
- (C) Load arm to
the effort arm
- (D) Effort arm
to the load arm
11. A special case of ductility which permits materials to be rolled or hammered into thin sheets, is called
- (A) Plasticity
- (B) Elasticity
- (C) Ductility
- (D) Malleability
12. Wahl's stress factor __________ very rapidly as the spring index decreases.
- (A) Increases
- (B) Decreases
- (C) Remain same
- (D) None of
these
13. When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)
- (A) (WD/ πd3) × K
- (B) (2WD/
πd3) × K
- (C) (4WD/
πd3) × K
- (D) (8WD/
πd3) × K
14. The face of the tooth is the
- (A) Surface of
the top of the tooth
- (B) Surface of
the tooth above the pitch surface
- (C) Surface
of the tooth below the pitch surface
- (D) Width of the
tooth measured along the pitch circle
15. In a marine flange coupling, the pitch circle diameter of bolts is taken as
- (A) 1.2 d
- (B) 1.6 d
- (C) 2 d
- (D) 2.5 d
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