MCQOPTIONS
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MCQOPTIONS
This section includes 26 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A rectangular steel plate is joined to a vertical post using four identical rivets arranged as shown below in the figure. The shear load on the worst loaded rivet (in N) approximately is |
| A. | 1700 |
| B. | 1500 |
| C. | 1640 |
| D. | 1750 |
| Answer» D. 1750 | |
| 2. |
How can shock absorbing capacity of a bolt be increased |
| A. | By tightening it properly |
| B. | By increasing the shank diameter |
| C. | By grinding the shank |
| D. | By making the shank diameter equal to the core diameter of thread |
| Answer» E. | |
| 3. |
A fillet-welded joint is subjected to transverse loading F as shown in the figure. Both legs of the fillets are of 10 mm size and the weld length is 30 mm. If the allowable shear stress of the weld is 94 MPa, considering the minimum throat area of the weld, the maximum allowable transverse load per weld in kN is |
| A. | 14.44 |
| B. | 17.92 |
| C. | 19.93 |
| D. | 22.16 |
| Answer» D. 22.16 | |
| 4. |
In a riveted lap joint, which one is not a failure mode? |
| A. | Tearing failure of plate |
| B. | Bearing failure of plate |
| C. | Shearing failure of plate |
| D. | Tensile failure of rivet |
| Answer» E. | |
| 5. |
Crushing efficiency of riveted joint is given by |
| A. | \(\frac{p/d}{t}\) |
| B. | \(\frac{\pi~\times~ d^2~\times~ \tau }{p~\times~ t~\times~ \sigma _t }\) |
| C. | \(\frac{p}{p~-~d}\) |
| D. | \(\frac{n~\times~ d~\times~ t~\times~\sigma_c}{p~\times~ t~\times ~\sigma_t}\) |
| Answer» E. | |
| 6. |
A bolt is designed with a large factor of safety, on the basis of |
| A. | Direct tensile stress |
| B. | Direct compressive stress |
| C. | Direct bending stress |
| D. | Direct shear stress |
| Answer» B. Direct compressive stress | |
| 7. |
A single parallel fillet weld of total length L and weld size h subjected to a tensile load P, will have what design stress? |
| A. | Tensile and equal to \(\frac {P}{0.707 Lh}\) |
| B. | Tensile and equal to \(\frac {P}{Lh}\) |
| C. | Shear and equal to \(\frac {P}{0.707 Lh}\) |
| D. | Shear and equal to \(\frac {P}{Lh}\) |
| Answer» D. Shear and equal to \(\frac {P}{Lh}\) | |
| 8. |
If the tearing efficiency of a riveted joint is 60%, then ratio of rivet hole diameter to the pitch of rivets is _____. |
| A. | 0.2 |
| B. | 0.33 |
| C. | 0.4 |
| D. | 0.5 |
| Answer» D. 0.5 | |
| 9. |
During crushing or bearing failure of riveted joints |
| A. | The holes in the plates become oval shaped and joints become loose |
| B. | There is tearing of the plate at an edge |
| C. | The plates will crack in radial directions and joints fail |
| D. | The rivet heads will shear out by applied stress |
| Answer» B. There is tearing of the plate at an edge | |
| 10. |
A circular solid rod of diameter ‘d’ welded to a rigid flat plate by a circular fillet weld of throat thickness ‘t’ is subjected to a twisting moment ‘T’. The maximum shear stress induced in the weld is |
| A. | \(\frac{T}{{\pi t{d^2}}}\) |
| B. | \(\frac{{2T}}{{\pi t{d^2}}}\) |
| C. | \(\frac{{4T}}{{\pi t{d^2}}}\) |
| D. | \(\frac{{8T}}{{\pi t{d^2}}}\) |
| Answer» C. \(\frac{{4T}}{{\pi t{d^2}}}\) | |
| 11. |
A threaded rod is placed inside a tube and fastened by nuts at both ends. The pitch of the thread is p. For quarter turn what is the advancement of the nut? |
| A. | p |
| B. | p/2 |
| C. | p/4 |
| D. | p/3 |
| Answer» D. p/3 | |
| 12. |
For what type of strength are transverse fillet welded joints designed? |
| A. | Tensile strength |
| B. | Compressive strength |
| C. | Shear strength |
| D. | Bending strength |
| Answer» B. Compressive strength | |
| 13. |
Pre-tensioning of a bolted joint is used to |
| A. | strain harden the bolt head |
| B. | decrease stiffness of the bolted joint |
| C. | increase stiffness of the bolted joint |
| D. | prevent yielding of the thread root |
| Answer» D. prevent yielding of the thread root | |
| 14. |
Number of bolts requited in a bolted joint is equal to |
| A. | \(\frac{{Force}}{{Bolt\;value}}\) |
| B. | \(\frac{{Force}}{{Strength\;of\;bolt\;in\;shearing}}\) |
| C. | \(\frac{{Force}}{{Strength\;of\;bolt\;in\;bearing}}\) |
| D. | \(\frac{{Force}}{{Strength\;of\;bolt\;in\;tearing}}\) |
| Answer» B. \(\frac{{Force}}{{Strength\;of\;bolt\;in\;shearing}}\) | |
| 15. |
Consider the schematic of a riveted lap joint subjected to tensile load F, as shown below. Let d be the diameter of the rivets, and Sf be the maximum permissible tensile stress in the plates. What should be the minimum value for the thickness of the plates to guard against tensile failure of the plates? Assume the plates to be identical. |
| A. | \(\frac{F}{{{S_f}\left( {W - 2d} \right)}}\) |
| B. | \(\frac{F}{{{S_f}W}}\) |
| C. | \(\frac{F}{{{S_f}\left( {W - d} \right)}}\) |
| D. | \(\frac{{2F}}{{{S_f}W}}\) |
| Answer» B. \(\frac{F}{{{S_f}W}}\) | |
| 16. |
In a riveted joint, when the number of rivets decrease from the innermost row to outermost row, the joint is said to be |
| A. | Chain rivetted |
| B. | Zig-zag rivetted |
| C. | Diamond rivetted |
| D. | None of these |
| Answer» D. None of these | |
| 17. |
Consider the following:The parallel fillet welded joint is designed for1) tensile strength2) compressive strength3) bending strength4) shear strengthWhich of the above is/are correct? |
| A. | 4 only |
| B. | 3 only |
| C. | 2 and 3 |
| D. | 1 and 4 |
| Answer» B. 3 only | |
| 18. |
If the tearing efficiency of a riveted joint is 50%, then the ratio of rivet hole diameter to the pitch of rivets is |
| A. | 0.2 |
| B. | 0.3 |
| C. | 0.5 |
| D. | 0.6 |
| Answer» D. 0.6 | |
| 19. |
Forty bolts are to be selected for fixing the cover plate of a cylinder subjected to a maximum load of 990 kN. If the design stress for bolt material is 330 N/mm2, what is the diameter of each bolt? |
| A. | 9.8 mm |
| B. | 4.9 mm |
| C. | 23.9 mm |
| D. | 30.90 mm |
| Answer» B. 4.9 mm | |
| 20. |
If the plates are to be designed to avoid tearing failure, the maximum permissible load P in kN is |
| A. | 83 |
| B. | 125 |
| C. | 167 |
| D. | 201 |
| Answer» D. 201 | |
| 21. |
A triple riveted lap joint with zig-zag riveting is to be designed for 16 mm thick plate. Determine the diameter of the rivet hole. |
| A. | 24 mm |
| B. | 30 mm |
| C. | 20 mm |
| D. | 4 mm |
| Answer» B. 30 mm | |
| 22. |
In transverse fillet, welded joint, the size of weld is equal to |
| A. | 0.5 × Throat of weld |
| B. | Throat of weld |
| C. | √2 × Throat of weld |
| D. | 2 × Throat of weld |
| Answer» D. 2 × Throat of weld | |
| 23. |
An eccentrically loaded riveted joint is shown with 4 rivets at P, Q, R and S.Which of the rivets are the most loaded? |
| A. | P and Q |
| B. | Q and R |
| C. | R and S |
| D. | S and P |
| Answer» C. R and S | |
| 24. |
If the rivets are to be designed to avoid crushing failure, the maximum permissible load P in kN is |
| A. | 7.50 |
| B. | 15.00 |
| C. | 22.50 |
| D. | 30.00 |
| Answer» D. 30.00 | |
| 25. |
Name of the riveted joint shown in fig. is |
| A. | Double riveted lap joint (chain riveting) |
| B. | Double riveted butt joint (chain riveting) |
| C. | Double riveted butt joint (zigzag riveting) |
| D. | Double riveted lap joint (zigzag riveting) |
| Answer» C. Double riveted butt joint (zigzag riveting) | |
| 26. |
In a fillet welded joint, the weakest area of the weld is |
| A. | Toe |
| B. | Root |
| C. | Throat |
| D. | Face |
| Answer» D. Face | |