Practice Test: Question Set - 21
1. When spring index increases, the value of Wahl's stress factor
- (A) Increases
linearly
- (B) Decreases
linearly
- (C) Remains
same
- (D) Increases
exponentially
2. In worm gears, the pressure angle is __________ the angle between two inclined faces in axial plane.
- (A) Half
- (B) Twice
- (C) Thrice
- (D) None of
these
3. A steel containing _________ 0.8% carbon is known as hypo-eutectoid steel.
- (A) Equal to
- (B) Less than
- (C) Greater than
- (D) None of
these
4. The material commonly used for crane hooks is
- (A) Cast iron
- (B) Wrought iron
- (C) Mild steel
- (D) Aluminium
5. A leaf spring in automobiles is used
- (A) To apply
forces
- (B) To measure
forces
- (C) To absorb
shocks
- (D) To
store strain energy
6. The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ are equal to 6/(6 + v).
- (A) 10 m/s
- (B) 12.5 m/s
- (C) 15 m/s
- (D) 20 m/s
7. When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be
- (A) 4F/ πd²
- (B) 6F/ πd²
- (C) 8F/ πd²
- (D) 16F/ 3πd²
8. According to Indian standards, total numbers of fundamental deviations are
- (A) 10
- (B) 15
- (C) 20
- (D) 25
9. The most important dimension in the design of a nut is
- (A) Pitch
diameter
- (B) Inside
diameter
- (C) Outside
diameter
- (D) Height
10. When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is
- (A) Tensile
stress
- (B) Compressive
stress
- (C) Shear stress
- (D) Bending
stress
11. If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to
- (A) T₁ - T₂
+ Tc
- (B) T₁ + T₂
+ Tc
- (C) (T₁
- T₂ + Tc)/2
- (D) (T₁
+ T₂ + Tc)/2
12. The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (D) is given by (where T = Number of teeth on the sprocket)
- (A) p = D sin (90°/T)
- (B) p = D sin (120°/T)
- (C) p = D sin (180°/T)
- (D) p = D sin (360°/T)
13. Cast iron pipes are mainly used
- (A) For
conveying steam
- (B) In water and
sewage systems
- (C) In
pressure lubrication systems on prime movers
- (D) All
of the above
14. The modulus of elasticity for mild steel is approximately equal to
- (A) 80 kN/mm²
- (B) 100 kN/mm²
- (C) 110 kN/mm²
- (D) 210 kN/mm²
15. If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited
- (A) Square
- (B) Acme
- (C) Buttress
- (D) BSW
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