Design Against Static Load Machine Design MCQ - Set 04 - ObjectiveBooks

# Practice Test: Question Set - 04

1. When a circular shaft is subjected to torque, the torsional shear stress is
(A) Maximum at the axis of rotation and zero at the outer surface
(B) Uniform from axis of rotation to the outer surface
(C) Zero at the axis of rotation and maximum at the outer surface
(D) Zero at the axis of rotation and zero at the outer surface and maximum at the mean radius

2. When the diameter of shaft is doubled, its torque transmitting capacity will increase by
(A) 8 times
(B) 2 times
(C) 4 times
(D) 16 times

3. The neutral axis of a beam is
(A) Layer subjected to tensile stress
(B) Layer subjected to compressive stress
(C) Layer subjected to zero stress
(D) None of the above

4. When a hole of diameter D is punched in a plate of thickness t, the force required to punch the hole is given by, Where Sus is ultimate shear strength of plate material.
(A) Ï€dtSus
(B) Ï€d2tSus
(C) (Ï€/4) d2tSus
(D) (Ï€/4) d2Sus

5. The taper on cotter is usually
(A) 1 in 24
(B) 1 in 8
(C) 1 in 100
(D) 1 in 48

6. Cotter joint is used for the joint between
(A) Piston rod and crosshead of steam engine
(B) Slide spindle and fork of valve mechanism
(C) Piston rod and tail rod or pump rod
(D) For all three applications

7. The joint in valve mechanism of reciprocating engine is
(A) Knuckle joint
(B) Universal joint
(C) Cotter joint
(D) Key joint

8. In lever terminology, ‘mechanical advantage’ is the ratio of
(C) Load arm to effort arm
(D) Effort arm to load arm

9. The lever loaded safety valve mounted on boiler is
(A) First type of lever
(B) Second type of lever
(C) Third type of lever
(D) None of the above

10. The cross-section of lever is
(A) Rectangular
(B) Elliptical
(C) I - section
(D) Any one of the above

11. Distortion energy theory of failure is applicable to
(A) Components made of plain carbon steel
(C) Components made of cast iron

12. For distortion theory, the shape of the region of safety on Ïƒ1, Ïƒ2 co-ordinate system is
(A) Square
(B) Hexagon
(C) Ellipse
(D) Circle

13. The bending stress in a curved beam is,
(A) Zero at the neutral axis
(B) Zero at the centroidal axis
(C) Zero at the inner fiber
(D) Zero at the outer fiber

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