Mechanical Engineering Design Objective Questions with Answers - Set 07

Practice Test: Question Set - 07

1. Machine screws are
    (A) Similar to small size tap bolts except that a greater variety of shapes of heads are available
    (B) Slotted for a screw driver and generally used with a nut
    (C) Used to prevent relative motion between two parts
    (D) Similar to stud

2. A machine part subjected to _________ is called a strut.
    (A) An axial compressive force
    (B) A tangential force
    (C) An axial tensile force
    (D) Any one of these

3. Rivets are generally specified by
    (A) Thickness of plates to be riveted
    (B) Length of rivet
    (C) Diameter of head
    (D) Nominal diameter

4. The edges of a boiler plate are bevelled to an angle of
    (A) 30°
    (B) 45°
    (C) 60°
    (D) 80°

5. The stress induced in the belt is,
    (A) Tensile stress
    (B) Compressive stress 
    (C) Direct shear stress
    (D) Torsional shear stress

6. Which of the following is a permanent fastening?
    (A) Bolts
    (B) Keys
    (C) Cotters
    (D) Rivets

7. In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to
    (A) d
    (B) 1.25 d
    (C) 1.5 d
    (D) 1.75 d

8. The dedendum circle diameter is equal to (where φ = Pressure angle)
    (A) Pitch circle diameter × cosφ
    (B) Addendum circle diameter × cosφ
    (C) Clearance circle diameter × cosφ
    (D) Pitch circle diameter × sinφ

9. If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to
    (A) 0.2
    (B) 0.25
    (C) 0.50
    (D) 0.6

10. Transverse fillet welded joints are designed for
    (A) Tensile strength
    (B) Compressive strength
    (C) Shear strength
    (D) Bending strength

11. A sliding bearing which can support steady loads without any relative motion between the journal and the bearing, is called
    (A) Hydrostatic lubricated bearing
    (B) Hydrodynamic lubricated bearing
    (C) Boundary lubricated bearing
    (D) Zero film bearing

12. Jam 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 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 spitted and bent in reverse direction at other end

13. When the belt is transmitting maximum power, the belt speed should be
(Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))
    (A) √(Pmax / 2m)
    (B) √(Pmax / 3m)
    (C) √(Pmax / m)
    (D) √(3m /Pmax)

14. The pitch of threads on a Jock nut in comparison to pitch of nut is
    (A) Same
    (B) Coarser
    (C) Finer
    (D) Very fine

15. Buttress threads are usually found on
    (A) Screw cutting lathes
    (B) Feed mechanisms
    (C) Spindles of bench vices
    (D) Railway carriage couplings

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