Practice Test: Question Set - 31
1. In designing a sleeve coupling, length of the sleeve is taken as (where d = Diameter of the shaft)
- (A) d + 17 mm
- (B) 2d + 13 mm
- (C) 2d + 20 mm
- (D) 3.5 d
2. The maximum shear stress theory is used for
- (A) Brittle materials
- (B) Ductile materials
- (C) Plastic materials
- (D) Nonferrous materials
3. A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is
- (A) 1 kN-m
- (B) 2 kN-m
- (C) 3 kN-m
- (D) 4 kN-m
4. In worm, gears, pitch lead angle is
- (A) Half the angle between two inclined faces in axial plane
- (B) The angle between the tangent to the pitch helix and the plane of rotation
- (C) The angle between the tangent to the pitch helix and an element of the cylinder
- (D) None of the above
5. In designing a connecting rod, it is considered like __________ for buckling about X-axis.
- (A) Both ends hinged
- (B) Both ends fixed
- (C) One end fixed and the other end hinged
- (D) One end fixed and the other end free
6. Two rigid plates are clamped by means of bolt and nut with an initial force F. After tightening, a separating force P (P < F) is applied to the lower plate, which in turn acts on the nut. The tension in the both after this is
- (A) F + P
- (B) F.P
- (C) P
- (D) F
7. The spring mostly used in gramophones is
- (A) Helical spring
- (B) Conical spring
- (C) Flat spiral spring
- (D) Volute spring
8. The maximum bending stress in a curved beam having symmetrical section always occur at the
- (A) Centroidal axis
- (B) Neutral axis
- (C) Inside fiber
- (D) Outside fiber
9. In a flange coupling, the bolts are subjected to
- (A) Tensile stress
- (B) Compressive stress
- (C) Shear stress
- (D) None of these
10. The ratio of circumferential stress to longitudinal stress in a thin cylinder subjected to an internal pressure is
- (A) 1/2
- (B) 1
- (C) 2
- (D) 4
11. For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)
- (A) 2μ sinθ/(θ + sinθ)
- (B) μ sinθ/(2θ + sin 2θ)
- (C) 4μ sinθ/(θ + sinθ)
- (D) 4μ sinθ/(2θ + sin 2θ)
12. When a hole of diameter ‘d’ is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)
- (A) d.t.τu
- (B) πd.t.τu
- (C) π/4 ×d².τu
- (D) π/4 ×d² × tτu
13. In static loading, stress concentration is more serious in
- (A) Brittle materials
- (B) Ductile materials
- (C) Brittle as well as ductile materials
- (D) Elastic materials
14. Which of the following statement is correct, for two shafts connected in parallel?
- (A) Torque in each shaft is the same
- (B) Shear stress in each shaft is the same
- (C) Angle of twist of each shaft is the same
- (D) Torsional stiffness of each shaft is the same
15. According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be
- (A) 45 to 60%
- (B) 63 to 70%
- (C) 70 to 83%
- (D) 80 to 90%