MCQOPTIONS
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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.
| 151. |
The bending moment and a torque is applied on a solid circular shaft. If the maximum bending stress equals to maximum shear stress developed, then is equal to |
| A. | /2 |
| B. | 2 |
| C. | 4 |
| Answer» B. 2 | |
| 152. |
For longitudinal joint in boilers, the type of joint used is |
| A. | butt joint with single cover plate |
| B. | butt joint with double cover plate |
| C. | lap joint with one ring overlapping the other |
| D. | any one of the above |
| Answer» C. lap joint with one ring overlapping the other | |
| 153. |
A cotter joint is used to transmit |
| A. | axial tensile load only |
| B. | axial compressive load only |
| C. | combined axial and twisting loads |
| D. | axial tensile or compressive loads |
| Answer» E. | |
| 154. |
The dynamic tooth load is due to |
| A. | inaccuracies of tooth spacing |
| B. | irregularities in tooth profiles |
| C. | deflections of teeth under load |
| D. | all of these |
| Answer» E. | |
| 155. |
The radial distance from the __________ to the clearance circle is called working depth. |
| A. | addendum circle |
| B. | dedendum circle |
| Answer» B. dedendum circle | |
| 156. |
The efficiency of a square threaded screw is maximum if the helix angle is equal to (where φ = Angle of friction) |
| A. | 90° - φ |
| B. | 45° - φ |
| C. | 45° - φ/2 |
| D. | 45° + φ/2 |
| Answer» D. 45° + φ/2 | |
| 157. |
In designing thick cylinders, the equation used is |
| A. | Lame's equation |
| B. | Birnie's equation |
| C. | Clavarinos' equation |
| D. | all of these |
| Answer» E. | |
| 158. |
Two shafts and are made of the same material. The diameter of shaft is twice as that of shaft . The power transmitted by the shaft will be __________ of shaft . |
| A. | twice |
| B. | four times |
| C. | eight times |
| D. | sixteen times |
| Answer» D. sixteen times | |
| 159. |
A parallel sunk key, made of steel, is equally strong in shearing and crushing. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 160. |
In a belt drive, the velocity ratio is the inverse ratio of the diameters of driving and driven pulleys. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 161. |
In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis. |
| A. | equal to |
| B. | twice |
| C. | three times |
| D. | four times |
| Answer» E. | |
| 162. |
The bearing characteristic number in a hydrodynamic bearing depends upon |
| A. | length, width and load |
| B. | length, width and speed |
| C. | viscosity, speed and load |
| D. | viscosity, speed and bearing pressure |
| Answer» E. | |
| 163. |
According to Lame's equation, the thickness of a cylinder is equal to (where = Inner diameter of cylinder, = Internal pressure, and μ = Poisson's ratio. ) |
| A. | none of these |
| Answer» D. | |
| 164. |
The material generally used for air-craft components is |
| A. | mild steel |
| B. | high speed steel |
| C. | stainless steel |
| D. | aluminium |
| Answer» E. | |
| 165. |
The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth. |
| A. | increases |
| B. | decreases |
| Answer» B. decreases | |
| 166. |
In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing |
| A. | remains constant at all speeds |
| B. | is minimum at zero speed and increases monotonically with increase in speed |
| C. | is maximum at zero speed and decreases monotonically with increase in speed |
| D. | becomes minimum at an optimum speed and then increases with further increase in speed |
| Answer» E. | |
| 167. |
The working of metals above the recrystallisation temperature is known as hot working. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 168. |
The ratio of number of teeth to the pitch circle diameter in millimetres is called circular pitch. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 169. |
The washer is generally specified by its |
| A. | outer diameter |
| B. | hole diameter |
| C. | thickness |
| D. | mean diameter |
| Answer» C. thickness | |
| 170. |
When percentage of carbon in steel is increased, the ductility of steel decreases. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 171. |
The shock absorbing capacity of a bolt may be increased by |
| A. | increasing its shank diameter |
| B. | decreasing its shank diameter |
| C. | tightening the bolt properly |
| D. | making the shank diameter equal to core diameter of thread |
| Answer» C. tightening the bolt properly | |
| 172. |
A lap joint is always in single shear. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 173. |
If denotes the face width and denotes the cone distance for a bevel gear, then the bevel factor is written as |
| A. | / |
| B. | /2 |
| C. | 1 - 2 |
| D. | . |
| E. | 1 - b/ |
| Answer» E. 1 - b/ | |
| 174. |
The fatigue stress concentration factor is defined as |
| A. | the ratio of endurance limit with stress concentration to the endurance limit without stress concentration |
| B. | the ratio of endurance limit without stress concentration to the endurance limit with stress concentration |
| C. | the product of the endurance limits with and without stress concentration |
| D. | all of the above |
| Answer» C. the product of the endurance limits with and without stress concentration | |
| 175. |
A connecting rod subjected to an axial load may buckle in the plane of motion of the connecting rod. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 176. |
When the shaft rotates in anticlockwise direction at high speed in a bearing, it will |
| A. | have contact at the bottom most of the bearing |
| B. | move towards right of the bearing making metal to metal contact |
| C. | move towards right of the bearing making no metal to metal contact |
| D. | move towards left of the bearing making metal to metal contact |
| Answer» D. move towards left of the bearing making metal to metal contact | |
| 177. |
When the top of a tooth undercuts the root on the mating gear, it is known as interference. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 178. |
If the helix angle of a helical gear is increased, the load carrying capacity of the tooth increases. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 179. |
A compound belt drive is used when |
| A. | shafts are arranged parallel and rotate in the opposite directions |
| B. | shafts are arranged parallel and rotate in the same directions |
| C. | shafts are arranged at right angles and rotate in one definite direction |
| D. | none of the above |
| Answer» E. | |
| 180. |
In a steam engine, the piston rod is usually connected to the crosshead by means of a |
| A. | knuckle joint |
| B. | cotter joint |
| C. | oldham coupling |
| D. | universal joint |
| Answer» C. oldham coupling | |
| 181. |
Lewis equation is applied |
| A. | only to the pinion |
| B. | only to the gear |
| C. | to stronger of the pinion or gear |
| D. | to weaker of the pinion or gear |
| Answer» E. | |
| 182. |
A tap 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» C. threads at both ends | |
| 183. |
According to I.B.R., when the thickness of the boiler shell () is less than 8 mm, then the diameter of the rivet hole () is obtained by |
| A. | equating tearing resistance of the plate to the shearing resistance of the rivets |
| B. | equating tearing resistance of the plate to the crushing resistance of the rivets |
| C. | equating shearing resistance to the crushing resistance of the rivets |
| D. | none of the above |
| Answer» D. none of the above | |
| 184. |
A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing. |
| A. | partially |
| B. | fully |
| Answer» B. fully | |
| 185. |
A flange coupling is used to connect two shafts |
| A. | which are perfectly aligned |
| B. | which are not in exact alignment |
| C. | have lateral misalignment |
| D. | whose axes intersect at a small angle |
| Answer» B. which are not in exact alignment | |
| 186. |
The algebraic difference between the maximum limit and the basic size is called |
| A. | lower deviation |
| B. | upper deviation |
| C. | actual deviation |
| D. | mean deviation |
| Answer» C. actual deviation | |
| 187. |
When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is |
| A. | tensile stress |
| B. | compressive stress |
| C. | shear stress |
| D. | bending stress |
| Answer» D. bending stress | |
| 188. |
A feather key is generally |
| A. | loose in shaft and tight in hub |
| B. | tight in shaft and loose in hub |
| C. | tight in both shaft and hub |
| D. | loose in both shaft and hub |
| Answer» C. tight in both shaft and hub | |
| 189. |
If the tearing efficiency of a riveted joint is 50%, then the ratio of diameter of rivet to the pitch is |
| A. | 0.20 |
| B. | 0.30 |
| C. | 0.50 |
| D. | 0.70 |
| Answer» D. 0.70 | |
| 190. |
The ratio of circumferential stress to longitudinal stress in a thin cylinder subjected to an internal pressure is |
| A. | 1/2 |
| B. | 1 |
| C. | 2 |
| D. | 4 |
| Answer» D. 4 | |
| 191. |
According to I.B.R., the thickness of the boiler shell should not be less than |
| A. | 4 mm |
| B. | 5 mm |
| C. | 6 mm |
| D. | 7 mm |
| Answer» E. | |
| 192. |
The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the pitch curve. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 193. |
A fast and loose pulley drive is used when |
| A. | shafts are arranged parallel and rotate in the opposite directions |
| B. | shafts are arranged parallel and rotate in the same directions |
| C. | shafts are arranged at right angles and rotate in one definite direction |
| D. | driven shaft is to be started or stopped whenever desired without interferring with the driving shaft |
| Answer» E. | |
| 194. |
In the assembly of pulley, key and shaft |
| A. | pulley is made the weakest |
| B. | key is made the weakest |
| C. | key is made the stongest |
| D. | all the three are designed for equal strength |
| Answer» C. key is made the stongest | |
| 195. |
A tapered key which fits in a key way in the hub and is flat on the shaft, is known as |
| A. | feather key |
| B. | gib-head key |
| C. | wood ruff key |
| D. | flat saddle key |
| Answer» E. | |
| 196. |
In static loading, stress concentration is more serious in |
| A. | brittle materials |
| B. | ductile materials |
| C. | brittle as well as ductile materials |
| D. | elastic materials |
| Answer» B. ductile materials | |
| 197. |
The bending stress in a curved beam is |
| A. | zero at the centroidal axis |
| B. | zero at the point other than centroidal axis |
| C. | maximum at the neutral axis |
| D. | none of these |
| Answer» C. maximum at the neutral axis | |
| 198. |
The piston pin bearings in heavy duty diesel engines are |
| A. | needle roller bearings |
| B. | tapered rolierbearings |
| C. | spherical roller bearings |
| D. | cylindrical roller bearings |
| Answer» B. tapered rolierbearings | |
| 199. |
The radial distance from the top of a tooth to the bottom of a tooth is called clearance |
| A. | True |
| B. | False |
| Answer» B. False | |
| 200. |
Cast iron pipes are mainly used |
| A. | for conveying steam |
| B. | in water and sewage systems |
| C. | in pressure lubrication systems on prime movers |
| D. | all of the above |
| Answer» C. in pressure lubrication systems on prime movers | |