# 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) 2

*d*+ 13 mm

- (C) 2

*d*+ 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**

*Î¼*= Actual coefficient of friction, and Î¸ = Semi-block angle)- (A) 2

*Î¼ sin*Î¸/(Î¸ + sinÎ¸)

- (B)

*Î¼ sin*Î¸/(2Î¸ + sin 2Î¸)

- (C) 4

*Î¼ sin*Î¸/(Î¸ + sinÎ¸)

- (D) 4

*Î¼ sin*Î¸/(2Î¸ + sin 2Î¸)

**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 Ï„_{u}*= Ultimate shear strength of the material of the plate)*- (A)

*d*

*.t.Ï„*

_{u}- (B)

*Ï€d.t.Ï„*

_{u}- (C)

*Ï€*/4 ×

*d².Ï„*

_{u}- (D)

*Ï€*/4 ×

*d²*×

*tÏ„*

_{u}**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%

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