MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 1003 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
The property of a bearing material which has the ability to accomodate shaft deflections and bearing inaccuracies by plastic deformation without excessive wear and heating, is known as |
| A. | bondability |
| B. | embeddability |
| C. | comformability |
| D. | fatigue strength |
| Answer» D. fatigue strength | |
| 252. |
In the levers of __________ type, the mechanical advantage is less than one. |
| A. | first |
| B. | second |
| C. | third |
| Answer» D. | |
| 253. |
A hollow saddle key is |
| A. | a taper key which fits half in the key way of hub and half in the key way of shaft |
| B. | a taper key which fits in a key way of the hub and is flat on the shaft |
| C. | a taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft |
| D. | provided in pairs at right angles and each key is to withstand torsion in one direction only |
| Answer» D. provided in pairs at right angles and each key is to withstand torsion in one direction only | |
| 254. |
Crowning on pulley helps |
| A. | in decreasing the slip of the belt |
| B. | in increasing the slip of the belt |
| C. | to keep the belt in centre on a pulley while it is in motion |
| D. | to increase pulley life |
| Answer» D. to increase pulley life | |
| 255. |
The effect of key ways on a shaft is to reduce its load carrying capacity and to increase its torsional rigidity. |
| A. | True |
| B. | False |
| Answer» C. | |
| 256. |
A bushed pin flexible coupling is used to connect two shafts whose axes intersect at a small angle. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 257. |
According to Rankine's theory, the failure occurs at a point in a member |
| A. | when the maximum shear stress in a bi-axial stress system reaches the shear stress at elastic limit in a simple tension test |
| B. | when the maximum principal stress in a bi-axial stress system reaches the elastic limit of the material in a simple tension test |
| C. | when the strain energy per unit volume in a bi-axial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test |
| D. | when the maximum principal strain in a bi-axial stress system reaches the strain at the elastic limit as determined from a simple tension test |
| Answer» C. when the strain energy per unit volume in a bi-axial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test | |
| 258. |
Which of the following welded joint is designed for shear strength ? |
| A. | Transverse fillet welded joint |
| B. | Parallel fillet welded joint |
| C. | Butt welded joint |
| D. | all of these |
| Answer» C. Butt welded joint | |
| 259. |
In designing a connecting rod, it is considered like __________ for buckling about X-axis. |
| A. | both ends hinged |
| B. | both ends fixed |
| C. | one end fixed and the other end hinged |
| D. | one end fixed and the other end free |
| Answer» B. both ends fixed | |
| 260. |
The material commonly used for crane hooks is |
| A. | cast iron |
| B. | wrought iron |
| C. | mild steel |
| D. | aluminium |
| Answer» C. mild steel | |
| 261. |
The eye bolts are used for |
| A. | transmission of power |
| B. | locking devices |
| C. | lifting and transporting heavy machines |
| D. | absorbing shocks and vibrations |
| Answer» D. absorbing shocks and vibrations | |
| 262. |
The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard specimen can withstand without failure, for infinite number of cycles, when subjected to |
| A. | static load |
| B. | dynamic load |
| C. | static as well as dynamic load |
| D. | completely reversed load |
| Answer» E. | |
| 263. |
The dedendum is the radial distance from the |
| A. | pitch circle to the top of a tooth |
| B. | pitch circle to the bottom of a tooth |
| C. | top of a tooth to the bottom of a tooth |
| D. | addendum circle to the clearance circle |
| Answer» C. top of a tooth to the bottom of a tooth | |
| 264. |
In a steam engine, the valve rod is connected to an eccentric rod by means of |
| A. | cotter joint |
| B. | knuckle joint |
| C. | universal joint |
| D. | flange coupling |
| Answer» C. universal joint | |
| 265. |
In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called |
| A. | normal pitch |
| B. | axial pitch |
| C. | diametral pitch |
| D. | module |
| Answer» C. diametral pitch | |
| 266. |
Which of the following property is essential for spring materials? |
| A. | Stiffness |
| B. | Ductility |
| C. | Resilience |
| D. | Plasticity |
| Answer» D. Plasticity | |
| 267. |
While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as |
| A. | both the ends fixed |
| B. | both the ends hinged |
| C. | one end fixed and the other end hinged |
| D. | one end fixed and the other end free |
| Answer» E. | |
| 268. |
A quarter turn belt drive is used when the shafts are arranged at right angles and rotate in one definite direction. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 269. |
According to Indian standard specifications, a plain carbon steel designated by 40C8 contains carbon |
| A. | 0.20 to 0.40% |
| B. | 0.35 to 0.45% |
| C. | 0.40 to 0.60% |
| D. | none of these |
| Answer» C. 0.40 to 0.60% | |
| 270. |
The machine screws are |
| A. | slotted for a screw driver and are generally used with a nut |
| B. | similar to tap bolts except that they are of small size and a variety of shapes of heads are available |
| C. | used to prevent relative motion between the two parts |
| D. | none of the above |
| Answer» B. similar to tap bolts except that they are of small size and a variety of shapes of heads are available | |
| 271. |
Which of the following formula is used in designing a connecting rod ? |
| A. | Euler's formula |
| B. | Rankine's formula |
| C. | Johnson's straight line formula |
| D. | Johnson's parabolic formula |
| Answer» C. Johnson's straight line formula | |
| 272. |
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is |
| A. | 0.20 |
| B. | 0.35 |
| C. | 0.50 |
| D. | 0.65 |
| Answer» D. 0.65 | |
| 273. |
The lead angle of a worm is 22.5°. Its helix angle will be |
| A. | 22.5° |
| B. | 45° |
| C. | 67.5° |
| D. | 90° |
| Answer» D. 90° | |
| 274. |
The root angle of a bevel gear is equal to |
| A. | pitch angle - addendum angle |
| B. | pitch angle + addendum angle |
| C. | pitch angle - dedendum angle |
| D. | pitch angle + dedendum angle |
| Answer» D. pitch angle + dedendum angle | |
| 275. |
In a journal bearing, the load on the bearing is __________ to the axis of the journal. |
| A. | parallel |
| B. | perpendicular |
| Answer» C. | |
| 276. |
The property of a bearing material which has the ability to accomodate small particles of dust, grit etc. without scoring the material of the journal, is called |
| A. | bondability |
| B. | embeddability |
| C. | comformability |
| D. | fatigue strength |
| Answer» C. comformability | |
| 277. |
The shock resistance of steel is increased by adding |
| A. | nickel |
| B. | chromium |
| C. | nickel and chromium |
| D. | cobalt and molybedenum |
| Answer» D. cobalt and molybedenum | |
| 278. |
A flange coupling is a type of rigid coupling. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 279. |
The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be |
| A. | 12 |
| B. | 14 |
| C. | 18 |
| D. | 24 |
| Answer» D. 24 | |
| 280. |
A bolt of M 24 x 2 means that |
| A. | the pitch of the thread is 24 mm and depth is 2 mm |
| B. | cross-sectional area of the threads is 24 mm |
| C. | the nominal diameter of bolt is 24 mm and pitch is 2 mm |
| D. | the effective diameter of bolt is 24 mm and there are 2 threads per cm |
| Answer» D. the effective diameter of bolt is 24 mm and there are 2 threads per cm | |
| 281. |
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle. |
| A. | larger than |
| B. | smaller than |
| C. | equal to |
| Answer» C. equal to | |
| 282. |
An imaginary circle which by pure rolling action gives the same motion as the actual gear, is called |
| A. | addendum circle |
| B. | dedendum circle |
| C. | pitch circle |
| D. | clearance circle |
| Answer» D. clearance circle | |
| 283. |
When the frictional force helps to apply the brake, then the brake is said to be self-energizing brake. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 284. |
Wahl's stress factor __________ very rapidly as the spring index decreases. |
| A. | increases |
| B. | decreases |
| Answer» B. decreases | |
| 285. |
In cyclic loading, stress concentration is more serious in |
| A. | brittle materials |
| B. | ductile materials |
| C. | brittle as well as ductile materials |
| D. | elastic materials |
| Answer» C. brittle as well as ductile materials | |
| 286. |
The fatigue limit of a material is greatly decreased by poor surface conditions. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 287. |
In a butt welded joint, the size of weld is __________ the throat of weld. |
| A. | 0.5 times |
| B. | equal to |
| C. | times |
| D. | double |
| Answer» C. times | |
| 288. |
Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation? |
| A. | Woodruff key |
| B. | Feather key |
| C. | Gib-head key |
| D. | Tangent key |
| Answer» E. | |
| 289. |
Which of the following cotter joint will be used to connect strap end of a connecting rod ? |
| A. | Spigot and socket cotter joint |
| B. | Sleeve and cotter joint |
| C. | Gib and cotter joint |
| D. | any one of these |
| Answer» D. any one of these | |
| 290. |
The temperature at which the new grains are formed in the metal is known as |
| A. | lower critical temperature |
| B. | upper critical temperature |
| C. | recrystallisation temperature |
| D. | none of these |
| Answer» D. none of these | |
| 291. |
The value of Lewis form factor used in design of gears is |
| A. | dependent on number of teeth of a gear |
| B. | dependent on system of teeth |
| C. | independent of size of teeth |
| D. | all of these |
| Answer» E. | |
| 292. |
The Lewis equation for gear tooth with involute profile predicts the static load capacity of cantilever beam of uniform strength. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 293. |
When the effort is in between the fulcrum and load, the lever is said to be of third type. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 294. |
In case of thick cylinders, the tangential stress across the thickness of cylinder is |
| A. | maximum at the outer surface and minimum at the inner surface |
| B. | maximum at the inner surface and minimum at the outer surface |
| C. | maximum at the inner surface and zero at the outer surface |
| D. | maximum at the outer surface and zero at the inner surface |
| Answer» C. maximum at the inner surface and zero at the outer surface | |
| 295. |
In a nut and bolt, the diameter at which the ridges on the bolt are in complete touch with the ridges of the corresponding nut, is called pitch diameter. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 296. |
A double strap butt joint (with equal straps) is |
| A. | always in single shear |
| B. | always in double shear |
| C. | either in single shear or double shear |
| D. | any one of these |
| Answer» C. either in single shear or double shear | |
| 297. |
For a bevel gear having the pitch angle θ , the ratio of formative number of teeth () to actual number of teeth () is |
| A. | 1/sin θ |
| B. | 1/cos θ |
| C. | 1/tan θ |
| D. | sin θ cos θ |
| Answer» C. 1/tan θ | |
| 298. |
A connecting rod subjected to an axial load may buckle with |
| A. | X-axis as neutral axis |
| B. | Y-axis as neutral axis |
| C. | X-axis or Y-axis as neutral axis |
| D. | Z-axis |
| Answer» D. Z-axis | |
| 299. |
A castle nut is a locking device in which |
| A. | a thinner nut is tightened down over a thicker or main nut and the main nut is tightened against the thinner nut by loosening |
| B. | a slot is cut in line with the centre of each face and a split pin passes through two slots in the nut and a hole in the bolt, so that a positive lock is obtained unless the pin shears |
| C. | a slot is cut about half way through the nut and a small screw is tightened between the nut and the bolt in order to produce more friction |
| D. | the bottom cylindrical portion is recessed to receive the tip of the locking set screw |
| Answer» C. a slot is cut about half way through the nut and a small screw is tightened between the nut and the bolt in order to produce more friction | |
| 300. |
If is the initial tension due to tightening up the bolt and is the external load on the bolt, then the resultant load () on a bolt may be obtained by using the relation (where = Ratio of elasticity of connected parts to the elasticity of bolt) |
| A. | = |
| B. | + |
| C. | = |
| D. | - |
| Answer» E. | |