Machine Design problems
- 1. The centre distance between two meshing involute gears is equal to
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 2. The toughness of a material __________ when it is heated.
Options- A. increases
- B. decreases
- C. does not change Discuss
Correct Answer: decreases
- 3. In a flange coupling, the flanges are coupled together by means of
Options- A. bolts and nuts
- B. studs
- C. headless taper bolts
- D. none of these Discuss
Correct Answer: bolts and nuts
- 4. Which of the following material has the maximum ductility?
Options- A. Mild steel
- B. Copper
- C. Zinc
- D. Aluminium Discuss
Correct Answer: Mild steel
- 5. According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)
Options- A. d = t
- B. d = 1.6 t
- C. d = 2 t
- D. d = 6 t Discuss
Correct Answer: d = 6 t
- 6. The application of third type levers is found in
Options- A. handle of a hand pump
- B. hand wheel of a punching press
- C. lever of a loaded safety valve
- D. a pair of tongs Discuss
Correct Answer: a pair of tongs
- 7. Two shafts A and B under pure torsion are of identical length and identical weight and are made of the same material. The shaft A is solid and the shaft B is hollow. We can say that
Options- A. shaft B is better than shaft A
- B. shaft A is better than shaft B
- C. both the shafts are equally good Discuss
Correct Answer: shaft B is better than shaft A
- 8. The constant factor in case of R10 series of preferred numbers is
Options- A. 1.06
- B. 1.12
- C. 1.26
- D. 1.58 Discuss
Correct Answer: 1.26
- 9. The sleeve or muff coupling is designed as a
Options- A. dun cylinder
- B. thick cylinder
- C. solid shaft
- D. hollow shaft Discuss
Correct Answer: hollow shaft
- 10. A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole)
Options- A. less than 20 d
- B. greater than 30 d
- C. between 20 d and 30 d
- D. equal to inside diameter of pipe Discuss
Correct Answer: between 20 d and 30 d
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