Practice Test: Question Set - 26
1. The dedendum is the radial distance from the
- (A) Pitch circle to the top of a tooth
- (B) Pitch circle to the bottom of a tooth
- (C) Top of a tooth to the bottom of a tooth
- (D) Addendum circle to the clearance circle
2. According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by
- (A) 0.5 mm up to rivet diameter of 24 mm
- (B) 1 mm for rivet diameter from 27 mm to 36 mm
- (C) 2 mm for rivet diameter from 39 mm to 48 mm
- (D) All of the above
3. The helix angle for single helical gears ranges from
- (A) 10° to 15°
- (B) 15° to 20°
- (C) 20° to 35°
- (D) 35° to 50°
4. The centre distance between two meshing involute gears is equal to
- (A) Sum of base circle radii/cosφ
- (B) Difference of base circle radii/cosφ
- (C) Sum of pitch circle radii/cosφ
- (D) Difference of pitch circle radii/cosφ
5. In block brakes, the ratio of shoe width to wheel diameter is taken between
- (A) 0.1 and 0.25
- (B) 0.25 and 0.50
- (C) 0.50 and 0.75
- (D) 0.75 and 1
6. Auto frettage is the method of
- (A) Joining thick cylinders
- (B) Calculating stresses in thick cylinders
- (C) Pre-stressing thick cylinders
- (D) Increasing the life of thick cylinders
7. A fast and loose pulley drive is used when
- (A) Shafts are arranged parallel and rotate in the opposite directions
- (B) Shafts are arranged parallel and rotate in the same directions
- (C) Shafts are arranged at right angles and rotate in one definite direction
- (D) Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
8. The stretching in a belt can be controlled by __________ the stress in the belt.
- (A) Reducing
- (B) Increasing
- (C) Both A and B
- (D) None of these
9. The property of a material which enables it to be drawn into wires with the application of a tensile force, is called
- (A) Plasticity
- (B) Elasticity
- (C) Ductility
- (D) Malleability
10. The cold working of metals is carried out __________ the recrystallization temperature.
- (A) Above
- (B) Below
- (C) At
- (D) None of these
11. The expansion joint is mostly used for pipes which carry steam at __________ pressures.
- (A) Low
- (B) High
- (C) Medium
- (D) None of these
12. Crushing resistance required to crush the rivet per pitch length is
- (A) p.d.σc
- (B) p.t.σc
- (C) n.d.t.σc
- (D) (p - d) t.σc
13. The strength of a riveted joint is equal to
- (A) Tearing strength of plate (Pt)
- (B) Shearing strength of rivet (Ps)
- (C) Crushing strength of rivet (Pc)
- (D) Least value of Pt Ps and Pc
14. The material generally used for aircraft components is
- (A) Mild steel
- (B) High speed steel
- (C) Stainless steel
- (D) Aluminium
15. In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of
- (A) Combined effect of transverse shear stress and bending stress in the wire
- (B) Combined effect of bending stress and curvature of the wire
- (C) Combined effect of transverse shear stress and curvature of wire
- (D) Combined effect of torsional shear stress and transverse shear stress in the wire