MCQOPTIONS
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MCQOPTIONS
This section includes 509 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Design knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
The ends of the coil of compression spring which are in contact with the seat are |
| A. | Carry maximum load |
| B. | Have significant role in compression |
| C. | Inactive |
| D. | Most active |
| E. | As active as spring |
| Answer» D. Most active | |
| 202. |
The pin supporting the exhaust iever of an internal combustion engine is subjected to a shear load of 400 kg/sq-cm the diameter of the pin should be |
| A. | 1.5 cm |
| B. | 4 cm |
| C. | 1 cm |
| D. | 6 cm |
| E. | 2 cm |
| Answer» D. 6 cm | |
| 203. |
When large quantities of bolts are to be purchased the quantity is usually specified in terms of |
| A. | Number |
| B. | Volume |
| C. | Packets |
| D. | Weight |
| E. | None of the above |
| Answer» E. None of the above | |
| 204. |
A rolled steel flat designated as 50 ISF 8 means |
| A. | the flat is 50 mm wide and 8 mm thick |
| B. | Increasing the diameter of threaded portion |
| C. | the flat has cross-section 50 sq. mm and depth 8 mm |
| D. | the flat has cross-section 50 sq mm and width 8 mm |
| E. | the flat is 50 mm long and 8 mm thick |
| Answer» B. Increasing the diameter of threaded portion | |
| 205. |
In nylon bearings operate at very high rpm molybdenum disulphide as used mainly to |
| A. | assists in heat dissipation |
| B. | provide porous bearing media for vibration absorption |
| C. | Increasing the diameter of threaded portion |
| D. | reduce frictional losses |
| E. | improve mechanical and lubricating properties |
| Answer» F. | |
| 206. |
Rivets are made of |
| A. | Brittle material |
| B. | Ductile material |
| C. | Soft material |
| D. | Hard material |
| E. | None of the above |
| Answer» C. Soft material | |
| 207. |
A stud has |
| A. | Counter shunk head |
| B. | Allen head |
| C. | Slotted head |
| D. | Cylindrical head |
| E. | Both ends threaded |
| Answer» F. | |
| 208. |
The plastic design of steel structures which is based on the statical method of plastic analysis is |
| A. | independent of safety |
| B. | gegas no indication of safety |
| C. | Increasing the diameter of threaded portion |
| D. | Safe |
| E. | Unsafe |
| Answer» E. Unsafe | |
| 209. |
The ratio of the area of cross-section of a circular section and the area of its core is |
| A. | 10 |
| B. | Increasing the diameter of threaded portion |
| C. | 16 |
| D. | 12 |
| E. | 8 |
| Answer» D. 12 | |
| 210. |
Power capacitors are used |
| A. | To improve electrical capacity |
| B. | To improve efficiency |
| C. | To reduce power factor |
| D. | To improve power factor |
| E. | None of the above |
| Answer» E. None of the above | |
| 211. |
The stress concentration factor for flat bar in tension with a circular hole, is |
| A. | 1.5 |
| B. | 1 |
| C. | 2.5 |
| D. | 1.25 |
| E. | 2 |
| Answer» D. 1.25 | |
| 212. |
Hot isostatic pressing of metals reduces |
| A. | porosity |
| B. | Increasing the diameter of threaded portion |
| C. | endurance limit |
| D. | fatigue strength |
| E. | ductility |
| Answer» B. Increasing the diameter of threaded portion | |
| 213. |
As viscosity of lubricating oil decreases, bearing load capacity |
| A. | increases linearly |
| B. | decreases |
| C. | Increasing the diameter of threaded portion |
| D. | increases exponentially |
| Answer» C. Increasing the diameter of threaded portion | |
| 214. |
Which of the following statement about wire ropes is not correct? |
| A. | Wire ropes are used as guy wires with the steel towers |
| B. | Wire ropes have the disadvantage of rigidity and poor strength |
| C. | Increasing the diameter of threaded portion |
| D. | Wire ropes require special fittings for proper end connections |
| E. | Wire ropes are given initial tension |
| Answer» C. Increasing the diameter of threaded portion | |
| 215. |
For maximum horse power transmission in belt drives the velocity of belt left such that the ration tight side driving tension/centrifugal tension is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| E. | None of the above |
| Answer» C. 3 | |
| 216. |
The cam follower generally used in automobiles is |
| A. | Mushroom type |
| B. | Flat type |
| C. | Spherical type |
| D. | Roller type |
| E. | Knife edge type |
| Answer» B. Flat type | |
| 217. |
The turbular section of a column has |
| A. | Increasing the diameter of threaded portion |
| B. | low buckling strength |
| C. | negligible buckling strength |
| D. | high buckling strength |
| Answer» F. | |
| 218. |
A key and a shaft are made from the same material. The key is rectangular with a width of D/4 and a height of 3D/16. The shaft is under torsion only. The necessary length of the key for equal strength of the shaft and key will be |
| A. | 1.25 D |
| B. | D |
| C. | 1.57 D |
| D. | 1.73 D |
| E. | 2.00 D |
| Answer» D. 1.73 D | |
| 219. |
The shape factor of standard rolled beam section varies in the range |
| A. | Increasing the diameter of threaded portion |
| B. | 1.0 to 1.1 |
| C. | 1.2 to 1.3 |
| D. | 1.1 to 1.2 |
| E. | 1.3 to 1.4 |
| Answer» E. 1.3 to 1.4 | |
| 220. |
Centrifugal tension in belts |
| A. | reduces power transmission |
| B. | increases power transmission |
| C. | does not affect power transmission |
| D. | none of the above |
| E. | Cast steel |
| Answer» B. increases power transmission | |
| 221. |
The blow off pressure of a safety valve is |
| A. | Slightly above atmospheric pressure |
| B. | Half of the boiler working pressure |
| C. | 2 x boiler working pressure |
| D. | Boiler working pressure |
| E. | 106% of boiler working pressure |
| Answer» F. | |
| 222. |
Taper roller bearings are used in automobiles for |
| A. | Differential |
| B. | Engine crankshaft |
| C. | Gear box |
| D. | Small end of connecting rod |
| E. | Wheels |
| Answer» F. | |
| 223. |
Which of the following material is not suitable for impact loads? |
| A. | Cast iron |
| B. | Chrome steel |
| C. | Mild steel |
| D. | High carbon steel |
| E. | Manganese steel |
| Answer» B. Chrome steel | |
| 224. |
Dibasic acid esters have |
| A. | fast evaporation at low temperatures |
| B. | do not wet the metal surface |
| C. | low film strength |
| D. | Increasing the diameter of threaded portion |
| E. | horizontal viscosity-temperature curves |
| Answer» F. | |
| 225. |
The value of Young's modulus of elasticity in ascending order for glass, lead, phosphor bronze, steel and wood is |
| A. | Wood, glass, lead, phosphor bronze, steel |
| B. | Wood, glass, phosphor bronze, lead steel |
| C. | Wood, phosphor bronze, lead glass steel |
| D. | Wood, lead, glass, phosphor bronze, steel |
| E. | Wood, phosphor bronze, glass, lead, steel |
| Answer» E. Wood, phosphor bronze, glass, lead, steel | |
| 226. |
The ratio of the strength of the weld mterial to that of the parent body is |
| A. | Increasing the diameter of threaded portion |
| B. | more than one |
| C. | less than one |
| D. | equal to one |
| Answer» C. less than one | |
| 227. |
Which of the following operation causes residual compressive stress on the surface of the material? |
| A. | Surface rolling |
| B. | Shot peening |
| C. | Induction hardening |
| D. | All of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» E. Increasing the diameter of threaded portion | |
| 228. |
Which of the following theory is also known as maximum shear stress theory of the failure of a material at the elastic limit |
| A. | Von Mises theory |
| B. | Guests Tresca theory |
| C. | Rankines theory |
| D. | Increasing the diameter of threaded portion |
| E. | Haig's theory |
| Answer» C. Rankines theory | |
| 229. |
The property which refers to the relative ease with which a material can be cut is known as |
| A. | Malleability |
| B. | Stiffness |
| C. | Machinability |
| D. | Chrome steel |
| E. | Softness |
| Answer» D. Chrome steel | |
| 230. |
The web crippling and web buckling may be prevented by |
| A. | increasing the thickness of web and reducing the length of bearing plates |
| B. | reducing the thickness of web as well as the length of bearing plates |
| C. | increasing the thickness of web as well as the length of bearing plates |
| D. | reducing the thickness of web and increasing the length of bearing plates |
| E. | Increasing the diameter of threaded portion |
| Answer» D. reducing the thickness of web and increasing the length of bearing plates | |
| 231. |
For which of the following gear material the noise level is relatively low? |
| A. | Non-ferrous materials |
| B. | Grade cast iron |
| C. | Non-matallic material |
| D. | Porous materials |
| E. | Alloy steels |
| Answer» D. Porous materials | |
| 232. |
In case the number of plastic hinges at failure is less than (r+1), where r is the degree of redundancy of the structure then the type of collapse of structure is |
| A. | elastic collapse |
| B. | complete collapse |
| C. | Increasing the diameter of threaded portion |
| D. | partial collapse |
| E. | over complete collapse |
| Answer» E. over complete collapse | |
| 233. |
A shaft subjected to combined bending and torsion can be designed by the following stress theory |
| A. | Maximum shear stress theory |
| B. | Maximum octahedral stress theory |
| C. | Maximum energy theory |
| D. | Maximum normal stress theory |
| E. | Increasing the diameter of threaded portion |
| Answer» B. Maximum octahedral stress theory | |
| 234. |
Maximum gear ratio in case of single mesh spur gears is expected to be around |
| A. | 150 |
| B. | 50 |
| C. | 80 |
| D. | 10 |
| E. | 100 |
| Answer» E. 100 | |
| 235. |
Induction hardening of components in done |
| A. | To increase hardness at the centre |
| B. | To increase the hardness of the core |
| C. | To increase hardness on the surface only |
| D. | To increase hardness uniformly |
| E. | To increase hardness at a spot only |
| Answer» D. To increase hardness uniformly | |
| 236. |
The plastic design of a steel structure based on which of the following unsafe? |
| A. | Kinematic method of plastic analyis |
| B. | Mechanism method of plastic analysis |
| C. | Upper bound theorem |
| D. | All of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» E. Increasing the diameter of threaded portion | |
| 237. |
ERW pipes are |
| A. | Elastic reinforced wire |
| B. | Extra reinforcement welded |
| C. | Electrically resistance welded |
| D. | Electrically reinforced and welded |
| E. | None of the above |
| Answer» D. Electrically reinforced and welded | |
| 238. |
The compression formula is valid upto the slenderness ratio of |
| A. | 15 |
| B. | 25 |
| C. | 30 |
| D. | 40 |
| E. | 10 |
| Answer» E. 10 | |
| 239. |
In a shaft fibre orientation in the direction of prevailing stress can be obtained by |
| A. | Increasing the diameter of threaded portion |
| B. | tumbling |
| C. | casting |
| D. | forging |
| E. | annealing |
| Answer» E. annealing | |
| 240. |
Rivets are driven in |
| A. | Either hot or cold condition |
| B. | Hot condition |
| C. | Cold condition |
| D. | Increasing the diameter of threaded portion |
| Answer» B. Hot condition | |
| 241. |
Steel balls for ball bearings are manufactured by |
| A. | Turning |
| B. | Casting |
| C. | Pressing |
| D. | Cold heading |
| E. | Rolling |
| Answer» E. Rolling | |
| 242. |
A single ply leather belt running at a belt velocity of 300 ft/min is likely to transmit per inch of width |
| A. | 4.0 HP |
| B. | 1.5 HP |
| C. | 6.0 HP |
| D. | 3.0 HP |
| E. | 5.0 HP |
| Answer» B. 1.5 HP | |
| 243. |
The piston of a double acting reciprocating steam engine is subjected to |
| A. | fully reversed stresses |
| B. | partly reversed stresses |
| C. | repeated stresses |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» B. partly reversed stresses | |
| 244. |
The column bases are mainly subjected to and designed for |
| A. | bearing and tension |
| B. | compression and tension |
| C. | Increasing the diameter of threaded portion |
| D. | bending and compression |
| E. | bearing and compression |
| Answer» E. bearing and compression | |
| 245. |
In case of a beam at the neutral axis. |
| A. | shear stress is zero and bending stress is maximum |
| B. | shear stress is minimum and bending stress is zero |
| C. | shear stress is minimum and bending stress is maximum |
| D. | Increasing the diameter of threaded portion |
| E. | shear stress is maximum and bending stress is minimum |
| Answer» B. shear stress is minimum and bending stress is zero | |
| 246. |
The ratio of the plastic moment capacity to the yeld moment capacity of a rectangular section is |
| A. | 1.25 |
| B. | 1.85 |
| C. | 1.5 |
| D. | Increasing the diameter of threaded portion |
| E. | 1.15 |
| Answer» D. Increasing the diameter of threaded portion | |
| 247. |
In case of a fillet weld, the throat is |
| A. | the hypotenuse of the triangle of the fillet |
| B. | perpendicular distance from the root to the hypotenuse. |
| C. | the smaller side of the triangle of the fillet |
| D. | Increasing the diameter of threaded portion |
| E. | the large side of the triangle of the fillet |
| Answer» C. the smaller side of the triangle of the fillet | |
| 248. |
The cam angle is |
| A. | The angle subtended by the live portion of the cam for a definite displacement of the follower |
| B. | The angle subtended by live portion of the cam at the cam centre |
| C. | The angle subtended at the cam centre by the protion of the cam during which the follower moves |
| D. | The angle subtended by the cam at the cam centre when the follower dwells |
| E. | None of the above |
| Answer» B. The angle subtended by live portion of the cam at the cam centre | |
| 249. |
The critical pressure of the journal bearing is |
| A. | at which oil film breaks down |
| B. | metal to metal contact begins |
| C. | minimum operating pressure of the bearing |
| D. | none of the above |
| E. | Cast steel |
| Answer» B. metal to metal contact begins | |
| 250. |
A muff type coupling |
| A. | Is a simple type rigid coupling |
| B. | Is a simple type of flexible coupling |
| C. | Is used for coplanar shafts |
| D. | Is used for non-coplanar shafts |
| E. | Non of the above |
| Answer» B. Is a simple type of flexible coupling | |