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.
| 201. |
In a multiple V-belt drive, if one of the belts break, then |
| A. | only the broken belt is replaced |
| B. | the entire set of belts is replaced |
| C. | the broken belt and the belt on either side of it, is replaced |
| D. | the broken belt need not to be replaced |
| Answer» C. the broken belt and the belt on either side of it, is replaced | |
| 202. |
The steel pulleys are __________ in weight than cast iron pulleys of the same capacity. |
| A. | heavier |
| B. | lighter |
| Answer» C. | |
| 203. |
The parallel fillet welded joints are designed for compressive strength. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 204. |
A column of length is fixed at both ends. The equivalent length of the column is |
| A. | /2 |
| B. | / |
| C. | 2 |
| Answer» B. / | |
| 205. |
The ratio of pitch circle diameter in millimetres to the number of teeth, is called |
| A. | circular pitch |
| B. | diametral pitch |
| C. | module |
| D. | none of these |
| Answer» D. none of these | |
| 206. |
According to Indian standard specifications, 100 H6/g5 means that |
| A. | tolerance grade for the hole is 6 and for the shaft is 5 |
| B. | tolerance grade for the shaft is 6 and for the hole is 5 |
| C. | tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7 |
| D. | tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7 |
| Answer» B. tolerance grade for the shaft is 6 and for the hole is 5 | |
| 207. |
The angle of twist of shaft is |
| A. | directly proportional to (shaft diameter) |
| B. | inversely proportional to (shaft diameter) |
| C. | directly proportional to (shaft diameter) |
| D. | inversely proportional to (shaft diameter) |
| Answer» E. | |
| 208. |
In the levers of third type, the mechanical advantage is __________ one. |
| A. | less than |
| B. | equal to |
| C. | more than |
| Answer» B. equal to | |
| 209. |
The edges of the boiler plates are bevelled to an angle of |
| A. | 45° |
| B. | 60° |
| C. | 70° |
| D. | 80° |
| Answer» E. | |
| 210. |
A spring of stiffness 1000 N/m is streteched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is |
| A. | 5 N-m |
| B. | 7 N-m |
| C. | 10 N-m |
| D. | 15 N-m |
| Answer» E. | |
| 211. |
A feather key transmits a turning moment and permits axial movement also. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 212. |
The width of the pulley should be __________ width of the belt. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» D. | |
| 213. |
In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing. |
| A. | thick film |
| B. | thin film |
| Answer» C. | |
| 214. |
The design of the pressure vessel is based on |
| A. | longitudinal stress |
| B. | hoop stress |
| C. | longitudinal and hoop stress |
| D. | none of these |
| Answer» C. longitudinal and hoop stress | |
| 215. |
A screw is said to be a self locking screw, if its efficiency is |
| A. | less than 50 % |
| B. | more than 50% |
| C. | equal to 50% |
| D. | none of these |
| Answer» B. more than 50% | |
| 216. |
An aluminium member is designed on the basis of |
| A. | yield stress |
| B. | elastic limit stress |
| C. | proof stress |
| D. | ultimate stress |
| Answer» B. elastic limit stress | |
| 217. |
A plate with a circular hole in the centre is subjected to a pull of . The maximum stress induced at the edge of the hole is three times of the nominal stress. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 218. |
The cold working of metals is carried out __________ the recrystallisation temperature. |
| A. | above |
| B. | below |
| Answer» C. | |
| 219. |
The groove angle of the pulley for rope drive is usually |
| A. | 20° |
| B. | 35° |
| C. | 45° |
| D. | 60° |
| Answer» D. 60° | |
| 220. |
Lewis form factor for composite and full depth involute system is (where = Number of teeth) |
| A. | none of these |
| Answer» B. | |
| 221. |
The distribution of the forces along the length of key fitted in a shaft |
| A. | varies linearly |
| B. | is uniform throughout |
| C. | varies exponentially, being more near the torque-input end |
| D. | varies exponentially, being less near the torque-input end |
| Answer» D. varies exponentially, being less near the torque-input end | |
| 222. |
If and are the tensions on the tight and slack sides of the belt respectively, and is the centrifugal tension, then initial tension in the belt is equal to |
| A. | - |
| B. | + |
| C. | + |
| D. | + |
| Answer» E. | |
| 223. |
The smallest diameter of an external or internal screw thread is known as |
| A. | minor diameter |
| B. | major diameter |
| C. | pitch diameter |
| D. | none of these |
| Answer» B. major diameter | |
| 224. |
The process which improves the machinability of steels, but lowers the hardness and tensile strength is |
| A. | normalising |
| B. | full annealing |
| C. | process annealing |
| D. | spheroidising |
| Answer» E. | |
| 225. |
In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be |
| A. | 15 |
| B. | 17 |
| C. | 21 |
| D. | 25 |
| Answer» C. 21 | |
| 226. |
Rankine's theory is used for |
| A. | brittle materials |
| B. | ductile materials |
| C. | elastic materials |
| D. | plastic materials |
| Answer» B. ductile materials | |
| 227. |
The objective of caulking in a riveted joint is to make the joint |
| A. | free from corrosion |
| B. | stronger in tension |
| C. | free from stress |
| D. | leak-proof |
| Answer» E. | |
| 228. |
A material is stressed within elastic limit and its linear strain is double as compared to lateral strain. The ratio of its Bulk modulus to Young's modulus will be equal to one. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 229. |
A jam 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» 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 | |
| 230. |
The algebraic difference between the actual size and the corresponding basic size is called actual deviation. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 231. |
The average shear stress in the hollow shaft is smaller than the average shear stress in the solid shaft. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 232. |
A bolt has |
| A. | threads for the nut at one end and head at the other end |
| B. | head at one end and the other end fits into a tapped hole of one of the parts to be fastened |
| C. | threads at both ends |
| D. | pointed threads |
| Answer» B. head at one end and the other end fits into a tapped hole of one of the parts to be fastened | |
| 233. |
The power transmitted by a belt drive is maximum when the maximum tension in the belt is __________ the centrifugal tension. |
| A. | equal to |
| B. | double |
| C. | three times |
| D. | six times |
| Answer» D. six times | |
| 234. |
The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called |
| A. | repeated stress |
| B. | yield stress |
| C. | fluctuating stress |
| D. | alternating stress |
| Answer» D. alternating stress | |
| 235. |
When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (), then length of key will be |
| A. | 0.8 |
| B. | 1.2 |
| C. | 1.57 |
| D. | 1.8 |
| Answer» D. 1.8 | |
| 236. |
When a belt drive is transmitting maximum power, |
| A. | effective tension is equal to centrifugal tension |
| B. | effective tension is half of centrifugal tension |
| C. | driving tension on slack side is equal to centrifugal tension |
| D. | driving tension on tight side is twice the centrifugal tension |
| Answer» E. | |
| 237. |
Gears are casted by |
| A. | sand mould casting |
| B. | slush casting |
| C. | permanent mould casting |
| D. | centrifugal casting |
| Answer» D. centrifugal casting | |
| 238. |
In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be |
| A. | 0.96 |
| B. | 0.97 |
| C. | 0.98 |
| D. | 0.99 |
| Answer» B. 0.97 | |
| 239. |
The design of shafts made of brittle materials is based on |
| A. | Guest's theory |
| B. | Rankine's theory |
| C. | St Venant's theory |
| D. | VonMises theory |
| Answer» C. St Venant's theory | |
| 240. |
A locking device extensively used in automobile industry is a |
| A. | jam nut |
| B. | castle nut |
| C. | sawn nut |
| D. | ring nut |
| Answer» C. sawn nut | |
| 241. |
A key way lowers |
| A. | the strength of the shaft |
| B. | the rigidity of the shaft |
| C. | both the strength and rigidity of the shaft |
| D. | the ductility of the shaft |
| Answer» D. the ductility of the shaft | |
| 242. |
A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zig-zag riveting is proposed. Which of the following statement is correct? |
| A. | There are four rivets per pitch length, all in double shear |
| B. | There are four rivets per pitch length, out of which two are in single shear and two are in double shear |
| C. | There are five rivets per pitch length, all in double shear |
| D. | There are five rivets per pitch length, out of which four are in double shear and one is in single shear |
| Answer» E. | |
| 243. |
The form factor of a helical gear __________ with the increase in the helix angle. |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| Answer» B. decreases | |
| 244. |
The taper on a rectangular sunk key is |
| A. | 1 in 16 |
| B. | 1 in 32 |
| C. | 1 in 48 |
| D. | 1 in 100 |
| Answer» E. | |
| 245. |
When two parallel and coplaner shafts are connected by gears having teeth parallel to the axis of the shaft, the arrangement is known as spiral gearing. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 246. |
The wear load should be __________ the dynamic load. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» C. greater than | |
| 247. |
The centre to centre distance between two consecutive rivets in a row, is called |
| A. | margin |
| B. | pitch |
| C. | back pitch |
| D. | diagonal pitch |
| Answer» C. back pitch | |
| 248. |
A special case of ductility which permits materials to be rolled or hammered into thin sheets, is called |
| A. | plasticity |
| B. | elasticity |
| C. | ductility |
| D. | malleability |
| Answer» E. | |
| 249. |
Antifriction bearings are |
| A. | thick lubricated bearings |
| B. | plastic bearings |
| C. | thin lubricated bearings |
| D. | ball and roller bearings |
| Answer» E. | |
| 250. |
Stress concentration factor is defined as the ratio of |
| A. | maximum stress to the endurance limit |
| B. | nominal stress to the enurance limit |
| C. | maximum stress to the nominal stress |
| D. | nominal stress to the maximum stress |
| Answer» D. nominal stress to the maximum stress | |