Mechanical Engineering Design Objective Questions with Answers - Set 15

Practice Test: Question Set - 15


1. In order to obtain bolt of uniform strength
    (A) Increase shank diameter
    (B) Increase its length
    (C) Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread
    (D) Tighten die bolt properly

2. The wire ropes make contact at
    (A) Bottom of groove of the pulley
    (B) Sides and bottom of groove of the pulley
    (C) Anywhere in the groove of the pulley
    (D) Sides of groove of the pulley

3. A key capable of tilting in a recess milled out in a shaft is known as
    (A) Woodruff key
    (B) Feather key
    (C) Flat saddle key
    (D) Hollow saddle key

4. A key made from a cylindrical disc having segmental cross-section, is known as
    (A) Woodruff key
    (B) Feather key
    (C) Flat saddle key
    (D) Gib head key

5. The flank of the tooth is the
    (A) Surface of the top of the tooth
    (B) Surface of the tooth above the pitch surface
    (C) Width of the tooth measured along the pitch circle
    (D) Surface of the tooth below the pitch surface

6. The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called
    (A) Working depth
    (B) Clearance
    (C) Backlash
    (D) Face width

7. The valve rod in a steam engine is connected to an eccentric rod by
    (A) Cotter joint
    (B) Bolted joint
    (C) Knuckle joint
    (D) Universal coupling

8. Split nut is a locking device in which
    (A) One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
    (B) A slot is cut partly in middle of nut and then slot reduced by tightening screw
    (C) A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
    (D) Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end

9. Fabric belts are used in industrial applications because
    (A) They are cheap 
    (B) They can work at high temperature 
    (C) They are unaffected by moisture and humidity 
    (D) None of the above

10. Taper on the cotter and slot is provided
    (A) On both the sides
    (B) On one side only
    (C) On none of the sides
    (D) May be provided anywhere

11. Castle nut is a locking device in which
    (A) One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
    (B) A slot is cut partly is middle of nut and then slot reduced by tightening a screw
    (C) A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
    (D) Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end

12. The suitable material for belt used in flour mill is
    (A) Leather
    (B) Rubber 
    (C) Canvas or cotton duck
    (D) Balata gum 

13. When a nut is tightened by placing a washer below it, the bolt will be subjected to following type of loads
    (A) Compression
    (B) Tension
    (C) Shear
    (D) Combined loads

14. Gear box is used
    (A) To produce torque
    (B) For speed reduction
    (C) To obtain variable speeds
    (D) To increase efficiency of system

15. In order to remove internal stresses produced by hardening the steel, the process usually adopted is
    (A) Tempering
    (B) Normalizing
    (C) Annealing
    (D) Spheroidizing

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