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.
| 151. |
Life of a rolling bearing as listed in a catalogue is usually |
| A. | minimum expected life |
| B. | maximum expected life |
| C. | mean life |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» B. maximum expected life | |
| 152. |
According to Indian Boiler Regulations the essential requirement of any safety valve is that |
| A. | It should be costly |
| B. | It should have good appearance |
| C. | Its area should be sufficient to discharge the steam as quickly as it is generated with rise in pressure not more than 10% of the safety valve blow off pressure |
| D. | It should be located outside the boiler room |
| E. | It should be visible to boiler operator from all positions in the boiler room |
| Answer» D. It should be located outside the boiler room | |
| 153. |
The plastic hinge in a section is caused when |
| A. | all the fibres at a section reach the yield state |
| B. | the material at a section reaches plastic state |
| C. | the extreme fibres at a section reach the yield state |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» B. the material at a section reaches plastic state | |
| 154. |
A section is subjected to reversal of stresses. Choice exists for selecting any of the following section. Which one should be selected? |
| A. | T-section |
| B. | Unequal angle iron |
| C. | Channel section |
| D. | Hollow pipe |
| E. | Equal angle iron |
| Answer» E. Equal angle iron | |
| 155. |
For the plastic analysis, the criterion for the analysis of a structure is based upon |
| A. | yield load |
| B. | Increasing the diameter of threaded portion |
| C. | ultimate load |
| D. | working load |
| E. | breaking load |
| Answer» D. working load | |
| 156. |
Gas lubricated bearings are used for |
| A. | very high rpm and high load applications |
| B. | very low rpm and high load applications |
| C. | very low rpm and low load applications |
| D. | Increasing the diameter of threaded portion |
| E. | very high rpm and low load applications |
| Answer» F. | |
| 157. |
In bolts the stress in the unthreaded area (the shank) is |
| A. | lower |
| B. | lower higher |
| C. | higher |
| D. | Increasing the diameter of threaded portion |
| E. | higher or lower |
| Answer» B. lower higher | |
| 158. |
For a parallel load on a fillet weld of equal leg the plane of maximum shear occurs |
| A. | Almost vertically |
| B. | Almost horizontallly |
| C. | At 45? to the horizontal |
| D. | At 30? to the vertical |
| E. | At 30? to the horizontal |
| Answer» D. At 30? to the vertical | |
| 159. |
Safety valve used on locomotive boilers is generally of |
| A. | Spring balanced type |
| B. | Lever load type |
| C. | Spring type |
| D. | Indirect dead weight type |
| E. | Dead weight type |
| Answer» D. Indirect dead weight type | |
| 160. |
The coefficient of friction in a rolling bearing is of the order of |
| A. | 0.01 |
| B. | 0.1 |
| C. | 0.2 |
| D. | 0.05 |
| E. | 0.001 |
| Answer» F. | |
| 161. |
The diameter of a washer is generally |
| A. | Equal to the diameter of bolt |
| B. | Slightly less than the diameter of the bolt |
| C. | Slight more than the diameter of the bolt |
| D. | Of any size that suits the application |
| E. | None of the above |
| Answer» D. Of any size that suits the application | |
| 162. |
Which of the following key transmits power through frictional resistance only |
| A. | Tangent key |
| B. | Saddle key |
| C. | Woodruff key |
| D. | Kennedy key |
| E. | Sunk key |
| Answer» C. Woodruff key | |
| 163. |
All the dimensions for a standard system of interchangeable gears can be defined in terms of |
| A. | Module |
| B. | Diametral pitch and circular pitch |
| C. | Pressure angle and pitch |
| D. | No of teeth and pitch circular diameter |
| E. | Addendum and dedendum |
| Answer» D. No of teeth and pitch circular diameter | |
| 164. |
Bearings provided on passenger coaches in railway are |
| A. | Bush bearings |
| B. | Cast iron bearings |
| C. | Ball bearings |
| D. | Roller bearings |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 165. |
In case of brittle material the theory of elastic failure generally applied is |
| A. | Maximum total strain energy theory |
| B. | Maximum principal stress theory |
| C. | Distortion energy theory |
| D. | Maximum shear stress theory |
| E. | Maximum strain theory |
| Answer» C. Distortion energy theory | |
| 166. |
In the case of a cantilever, irrespective of the type, loading of the maximum bending moment and maximum shear force occur at |
| A. | Free end |
| B. | ?rd of length from fixed end |
| C. | Centre |
| D. | Increasing the diameter of threaded portion |
| E. | Fixed end |
| Answer» F. | |
| 167. |
The holding power of sunk key is due to resistance which it offers in |
| A. | Shear |
| B. | Crushing |
| C. | Shear and crushing |
| D. | Tension |
| E. | (C) and (D) above |
| Answer» D. Tension | |
| 168. |
The minimum thickness of steel members exposed to weather and accessible for painting is |
| A. | Increasing the diameter of threaded portion |
| B. | 6 mm |
| C. | 12 mm |
| D. | 8 mm |
| E. | 10 mm |
| Answer» C. 12 mm | |
| 169. |
In case of ball bearing |
| A. | Inner race should harder than outer race |
| B. | Outer race should be harder than balls |
| C. | Only cage should be hardened |
| D. | Inner race should be harder than balls |
| E. | Inner race, outer race and balls should be equally hardened |
| Answer» F. | |
| 170. |
By using large thread angles in lifting machine |
| A. | The load will be sustained in absence of the other |
| B. | The load will be easily lifted |
| C. | The mechanical advantage will be high |
| D. | The mechanical advantage will be low |
| E. | While unloading, little effort will be required |
| Answer» E. While unloading, little effort will be required | |
| 171. |
A coarse scres of major diameter 6 mm is designated as |
| A. | 6 M x 6 x 1 |
| B. | M 6 |
| C. | 6 M x 1 |
| D. | 1 x 6 M |
| E. | Coarse M 6 |
| Answer» C. 6 M x 1 | |
| 172. |
A reinforced concrete beam is considered as made of |
| A. | Homogeneous material |
| B. | Composite material |
| C. | Clad material |
| D. | Isotropic material |
| E. | Heterogeneous material |
| Answer» F. | |
| 173. |
Forced vibrations |
| A. | Are preceded by free vibrations |
| B. | Are followed by free vibrations |
| C. | Have a frequency more than the natural frequency |
| D. | Are independent of natural frequency |
| E. | None of the above |
| Answer» E. None of the above | |
| 174. |
In concrete mixer, the bevel gears for rotating the drum are generally |
| A. | Shaped |
| B. | Forged |
| C. | Hobbed |
| D. | Precisely machined |
| E. | Casted |
| Answer» F. | |
| 175. |
Stone erusher rolls are generally made |
| A. | Cast iron |
| B. | High carbon steel |
| C. | Mild steel |
| D. | Cast steel |
| E. | Grey iron |
| Answer» C. Mild steel | |
| 176. |
As per Indian Boilers regulations the type of joint preferred for longitudinal joint is |
| A. | Reveted butt joint |
| B. | Any of above |
| C. | Riveted lap joint |
| D. | Welded joint |
| E. | Welded joint with cover plate |
| Answer» B. Any of above | |
| 177. |
Two plates are joined by a parallel fillet welds. The plates are subjected to a tensile load of 35000 kg. If the allowable shear stress for the weld material be 800 kg the minimum length of 15 mm weld required to resist this load would be |
| A. | 41 cm |
| B. | 20.5 cm |
| C. | 10 cm |
| D. | 61.5 cm |
| E. | 82 cm |
| Answer» B. 20.5 cm | |
| 178. |
The segmental bottom of a circular tank is subjected to |
| A. | hoop tension |
| B. | hoop compression |
| C. | bending moment |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» C. bending moment | |
| 179. |
If a square key and the shaft are to be of the same material and of equal strength, the length of key would be (d = dia. Of shaft) |
| A. | 1.23 d |
| B. | 1.50 d |
| C. | 2 d |
| D. | d |
| E. | 0.75 d |
| Answer» B. 1.50 d | |
| 180. |
The natural frequency of a shaft in bending is |
| A. | Nearly the same as the critical speed |
| B. | Nearly half the critical speed |
| C. | Exactly the same at which it is running |
| D. | Nearly double of the critical speed |
| E. | Depends on load and other factors |
| Answer» B. Nearly half the critical speed | |
| 181. |
A fillet weld having axis parallel to the direction of the applied load is known as |
| A. | side fillet weld |
| B. | end fillet weld |
| C. | diagonal fillet weld |
| D. | flat fillet weld |
| E. | Increasing the diameter of threaded portion |
| Answer» B. end fillet weld | |
| 182. |
The ratio of maximum shear stress to average shear stress for a circular section is |
| A. | 4 |
| B. | 1?4 |
| C. | 2 |
| D. | 3?4 |
| E. | 4?3 |
| Answer» F. | |
| 183. |
A spring deflects 50 mm under a 250 kg load. If the load is applied gradually, the energy absorbed by the spring will be |
| A. | 2500 kg-cm |
| B. | 312.5 kg-cm |
| C. | 1050 kg-cm |
| D. | 625 kg-cm |
| E. | 1250 kg-cm |
| Answer» E. 1250 kg-cm | |
| 184. |
The material of a flt spiral spring is in a state of |
| A. | pure torsion |
| B. | pure bending |
| C. | torsion and bending |
| D. | none of the above |
| E. | Cast steel |
| Answer» C. torsion and bending | |
| 185. |
Where a spring with a spring rate that increases with load is desired |
| A. | Soft springs are used |
| B. | Non-ferrous springs are used |
| C. | Elliptical section is preferred |
| D. | Conical spring are used |
| E. | None of the above |
| Answer» E. None of the above | |
| 186. |
The deflection of a helical spring is |
| A. | Directly proportional to d3 |
| B. | Directly proportional to d3/2 |
| C. | Directly proportional to d |
| D. | Directly proportional to d4 |
| E. | Directly proportional to d2 |
| Answer» E. Directly proportional to d2 | |
| 187. |
In case of spur gears, the back lash depends on |
| A. | Module |
| B. | Pitch line velocity |
| C. | Tooth profile |
| D. | Both (A) and (B) above |
| E. | None of the above |
| Answer» E. None of the above | |
| 188. |
The cross-section of a standard fillet weld is a triangle with base angles of |
| A. | 45? and 45? |
| B. | Increasing the diameter of threaded portion |
| C. | 35? and 55? |
| D. | 60? and 30? |
| E. | 50? and 40? |
| Answer» B. Increasing the diameter of threaded portion | |
| 189. |
In as steam engine, piston rod is connected to the cross head by |
| A. | flange coupling |
| B. | universal coupling |
| C. | cotter joint |
| D. | knuckle joint |
| E. | Increasing the diameter of threaded portion |
| Answer» D. knuckle joint | |
| 190. |
Plow bolts are widely used in |
| A. | electrical fittings |
| B. | plastics |
| C. | form machinery |
| D. | electronic components |
| E. | Increasing the diameter of threaded portion |
| Answer» D. electronic components | |
| 191. |
Both Soderberg and Gerber criteria for failure theories are overly conservative |
| A. | near the middle of the curves |
| B. | near the right end of the curves |
| C. | Increasing the diameter of threaded portion |
| D. | near the left end of the curves |
| E. | near the left as well as right ends of the curve |
| Answer» C. Increasing the diameter of threaded portion | |
| 192. |
A screw jack spindle is provided with |
| A. | Vee threads |
| B. | BSW threads |
| C. | Buttress threads |
| D. | Square threads |
| E. | None of the above |
| Answer» E. None of the above | |
| 193. |
Transverse slots are provided on a thread |
| A. | To reduce effort required to cut threads |
| B. | For simplicity |
| C. | For chip removal and lubrication |
| D. | To reduce stress on threads to be cut |
| E. | To reduce stress on die |
| Answer» D. To reduce stress on threads to be cut | |
| 194. |
Which is the variable stress |
| A. | Fluctuating |
| B. | Reversed |
| C. | Repeated |
| D. | Alternating |
| E. | All of the above |
| Answer» F. | |
| 195. |
Sand drops from the bottom of a hopper into a horizontally moving belt conveyor. If the conveyor is travelling at 2000 fpm and the sand is fed at the rate of 1500 1b/min, the force necessary to drive the conveyor would be |
| A. | 258 lb |
| B. | Zero |
| C. | Cannot be determined from the given data |
| D. | 10 kg |
| E. | 516 lb |
| Answer» B. Zero | |
| 196. |
Large sections usually have a somewhat lower permissible stress than small sections. This is due to |
| A. | less homogeneity of structure of material |
| B. | larger residual stress |
| C. | greater probability of structural flaws |
| D. | All of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» E. Increasing the diameter of threaded portion | |
| 197. |
Which of the following is not a standard ball diameter for Brinell hardness testing? |
| A. | 25 mm |
| B. | 1 mm |
| C. | 10 mm |
| D. | 5 mm |
| E. | 2 mm |
| Answer» B. 1 mm | |
| 198. |
The selection of material for gears depends on |
| A. | Peripheral speed |
| B. | Type of service |
| C. | Required dimensions and weight of the drive |
| D. | Shock and wear resistance |
| E. | All of the above |
| Answer» F. | |
| 199. |
Which of the following bearings will have least coefficient of friction? |
| A. | Tapered bearing |
| B. | Self-aligning bearing |
| C. | Cylinder roller bearing |
| D. | Thrust ball bearing |
| E. | Single ball bearing |
| Answer» B. Self-aligning bearing | |
| 200. |
Coriolis component of acceleration is encountered in |
| A. | Lower pair |
| B. | Higher pair |
| C. | Whit worth-quick-return motion |
| D. | Four bar mechanism |
| E. | Mechanism of steam engine |
| Answer» D. Four bar mechanism | |