Machine Design Objective Questions and Answers - Set 25 - ObjectiveBooks

# Practice Test: Question Set - 25

1. The process extensively used for making bolts and nuts is
(A) Hot piercing
(B) Extrusion
(C) Cold peening

2. What is the answer to this question?
(A) 2WD3n/Gd⁴
(B) 4WD3n/Gd⁴
(C) 8WD3n/Gd⁴
(D) 16WD3n/Gd⁴

3. In a steam engine, the piston rod is usually connected to the cross-head by means of a
(A) Knuckle joint
(B) Cotter joint
(C) Oldham coupling
(D) Universal joint

4. When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is
(A) Bending stress only
(B) A combination of torsional shear stress and bending
(C) Direct shear stress only
(D) A combination of bending stress and direct shear stress

5. In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to
(A) Increase the key length
(B) Increase the key depth
(C) Increase the key width
(D) Decrease the key length

6. In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing
(A) Remains constant at all speeds
(B) Is minimum at zero speed and increases monotonically with increase in speed
(C) Is maximum at zero speed and decreases monotonically with increase in speed
(D) Becomes minimum at an optimum speed and then increases with further increase in speed

7. The largest diameter of an external or internal screw thread is known as
(A) Minor diameter
(B) Major diameter
(C) Pitch diameter
(D) None of these

8. For high speed engines, the cam follower should move with
(A) Uniform velocity
(B) Simple harmonic motion
(C) Uniform acceleration and retardation
(D) Cycloidal motion

9. The taper on a rectangular sunk key is
(A) 1 in 16
(B) 1 in 32
(C) 1 in 48
(D) 1 in 100

10. In designing thick cylinders, the equation used is
(A) Lame's equation
(B) Birnie's equation
(C) Clavarinos' equation
(D) All of these

11. A double strap butt joint (with equal straps) is
(A) Always in single shear
(B) Always in double shear
(C) Either in single shear or double shear
(D) Any one of these

12. The ratio of pitch circle diameter in millimeters to the number of teeth, is called
(A) Circular pitch
(B) Diametral pitch
(C) Module
(D) None of these

13. A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing.
(A) Partially
(B) Fully
(C) Either A or B
(D) None of these

14. In radial bearings, the load acts __________ to the axis of rotation.
(A) Parallel
(B) Perpendicular
(C) Both A and B
(D) None of these

15. The shear stress at a point in a shaft subjected to a torque is
(A) Directly proportional to the polar moment of inertia and to the distance of the point from the axis
(B) Directly proportional to the applied torque and inversely proportional to the polar moment of inertia
(C) Directly proportional to the applied torque and the polar moment of inertia
(D) Inversely proportional to the applied torque and the polar moment of inertia

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