Mechanical Engineering Design Objective Questions with Answers - Set 08 - ObjectiveBooks

# Practice Test: Question Set - 08

1. A tapered key which fits in a key-way in the hub and is flat on the shaft, is known as
(A) Woodruff key
(B) Feather key

2. Fibrous fracture occurs in
(A) Ductile material
(B) Brittle material
(C) Elastic material
(D) Hard material

3. When the belt is transmitting maximum power,
(A) The tension in tight side is twice the centrifugal tension
(B) The tension in slack side is equal to the centrifugal tension
(C) The tension in tight side is thrice the centrifugal tension
(D) None of the above

4. Turn buckle has
(A) Right hand threads on bout ends
(B) Left hand threads on both ends
(C) Left hand threads on one end and right hand threads on other end

5. Eye bolts are used for
(A) Foundation purposes
(B) Absorbing shock and vibrations
(C) Transmission of power
(D) Lifting and transportation of machines and cubicles

6. The contact ratio is the ratio of
(A) Length of arc of recess to the circular pitch
(B) Length of path of contact to the circular pitch
(C) Length of arc of contact to the circular pitch
(D) Length of arc of approach to the circular pitch

7. Elastic nut is a locking device in which
(A) One small 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) Hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed 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 other end

8. If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation
(A) 124 d
(B) 138 d
(C) 151 d
(D) 168 d

9. Which of the following statement is correct?
(A) The stress concentration in static loading is more serious in ductile materials and less serious in brittle materials
(B) The stress concentration in static loading is more serious in brittle materials and less serious in ductile materials
(C) The toughness of a material increases when it is heated
(D) The shear stress in a beam varies from zero at the neutral surface and maximum at the outer fibres

10. If threads on a bolt are left hand, threads on nut will be
(A) Right hand with same pitch
(B) Left hand with same pitch
(C) Could be left or right hand
(D) Right hand with fine pitch

11. Taper usually provided on cotter is
(A) 1 in 5
(B) 1 in 10
(C) 1 in 24
(D) 1 in 40

12. The condition for maximum power transmission is that the maximum tension in the flat belt should be equal to
(Where, Pc = tension in belt due to centrifugal force)
(A) 3 Pc
(B) Pc
(C) Pc/3
(D) 2 Pc

13. Applications in which stresses are encountered in one direction only uses following type of threads
(A) Metric
(B) Buttress
(C) Acme
(D) Square

14. The draw of cotter need not exceed
(A) 3 mm
(B) 5 mm
(C) 10 mm
(D) 20 mm

15. A bench vice has following type of threads
(A) Metric
(B) Square
(C) Buttress
(D) Acme

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