McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 151. |
The weakest plane in a fillet weld is |
| A. | the throat |
| B. | smaller of the sides |
| C. | side normal to the force |
| D. | side parallel to the force |
| E. | Increasing the diameter of threaded portion |
| Answer» A. the throat | |
| 152. |
The holes in plates for reveting are usually made by |
| A. | Arc cutting |
| B. | Oxyacetylene flame |
| C. | Punching |
| D. | Drilling |
| E. | Any of the above |
| Answer» D. Drilling | |
| 153. |
Which of the following treatment is often recommended for parts operating under corrosive conditions? |
| A. | strain-aging |
| B. | tempering |
| C. | normalising |
| D. | all of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» B. tempering | |
| 154. |
A material is generally classified as brittle if the percentage elongation (in a gauge length of 50 mm) is less than |
| A. | Chrome steel |
| B. | 1% |
| C. | 2% |
| D. | 5% |
| E. | 15% |
| Answer» D. 5% | |
| 155. |
A flange coupling is |
| A. | Used for non-collinear shafts |
| B. | Used for collinear shafts |
| C. | Flexible |
| D. | Used only on small shafts rotating at slow speeds |
| E. | None of the above |
| Answer» B. Used for collinear shafts | |
| 156. |
Splines are used when |
| A. | Axial relative motion between shaft and hub is necessary |
| B. | The torque is high |
| C. | The power to be transmitted is high |
| D. | rpm are high |
| E. | The power to be transmitted is low |
| Answer» A. Axial relative motion between shaft and hub is necessary | |
| 157. |
Bolts in structures are often tightened upto or beyond the yield point because |
| A. | frction is more beyond yield point thus providing a firm joint |
| B. | temperature variations may loosen the joint |
| C. | it improves endurance strength |
| D. | all of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» C. it improves endurance strength | |
| 158. |
A triple threaded worm has a pitch diameter of 100 mm and an axial pitch of 22 mm. The lead angle will be |
| A. | tan-1 0.21 |
| B. | tan-1 0.66 |
| C. | tan-1 0.22 |
| D. | tan-1 0.3 |
| E. | tan-1 0.36 |
| Answer» A. tan-1 0.21 | |
| 159. |
Spigot and socket joints are used on pipes |
| A. | Which are buried underground |
| B. | Carrying air at pressure above atmospheric pressure |
| C. | Carrying steam under high pressure |
| D. | Carrying high pressure fluids under high pressure |
| E. | Carrying air at pressure below atmospheric pressure |
| Answer» A. Which are buried underground | |
| 160. |
In a compression test the fracture in cast iron specimen would occur along |
| A. | An oblique plane |
| B. | Along the axis of the load |
| C. | At right angles to the specimen axis |
| D. | Fracture will not occur in cast iron |
| E. | None of the above |
| Answer» A. An oblique plane | |
| 161. |
If the allowable shear stress is 960 kg/sq. cm for the size h cm, the allowable force per cm of weld length would be |
| A. | 670 h |
| B. | 475 h |
| C. | 315 h |
| D. | 400 h |
| E. | 950 h |
| Answer» A. 670 h | |
| 162. |
In case of a knuckle joint the pin is likely to fail in |
| A. | Tension |
| B. | Crushing |
| C. | Double shear |
| D. | Compression |
| E. | Shear |
| Answer» C. Double shear | |
| 163. |
Shot peening leaves the material surface in |
| A. | residual tensile stress |
| B. | residual shear stress |
| C. | residual compressive stress |
| D. | All of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» C. residual compressive stress | |
| 164. |
A Babbit is |
| A. | A gadget for measuring volume |
| B. | A measure of magnetic induction produced in a material |
| C. | A eutectic of iron and iron phosphide |
| D. | None of these |
| E. | Antimony bearing lead or tin alloy |
| Answer» E. Antimony bearing lead or tin alloy | |
| 165. |
Low pressure angle on gears results in |
| A. | Weaker teeth |
| B. | stronger teeth |
| C. | abrasive wear |
| D. | none of the above |
| E. | Cast steel |
| Answer» A. Weaker teeth | |
| 166. |
An eye bolt is generally provided on |
| A. | Furnaces |
| B. | Bench vices |
| C. | Electric motors |
| D. | Overhead cranes |
| E. | All of the above |
| Answer» C. Electric motors | |
| 167. |
The satisfactory method of reclaiming worn out and under sized part subject to fatigue loads is |
| A. | Repainting |
| B. | Polishing |
| C. | Electroplating |
| D. | Recasting |
| E. | None of the above |
| Answer» C. Electroplating | |
| 168. |
The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is |
| A. | 1 micron |
| B. | 10 micron |
| C. | 0.01 micron |
| D. | 0.1 micron |
| E. | 100 micron |
| Answer» A. 1 micron | |
| 169. |
Dead weight type safety valve is not used on locomotives because |
| A. | It is costly |
| B. | It is susceptible to vibratory forces |
| C. | It is not reliable |
| D. | It is bulky |
| E. | It gives bad apparatus |
| Answer» B. It is susceptible to vibratory forces | |
| 170. |
Extrafine threaded connections are generally recommended for |
| A. | Increasing the diameter of threaded portion |
| B. | Rolled sections |
| C. | hardened objects |
| D. | thin walled assemblies |
| E. | Tapped hole in castings |
| Answer» D. thin walled assemblies | |
| 171. |
A square key is |
| A. | Equally strong in shear and compression |
| B. | Very weak in shear |
| C. | Less strong in shear and more strong in compression |
| D. | More strong in shear and less strong in compression |
| E. | Very weak in compression |
| Answer» A. Equally strong in shear and compression | |
| 172. |
A steel specified as St 50 will have a tensile strength of approximately |
| A. | 50 tonnes/m2 |
| B. | 50 kg/mm2 |
| C. | 50 kg/cm2 |
| D. | 50 tonnes/mm2 |
| E. | None of the above |
| Answer» B. 50 kg/mm2 | |
| 173. |
The chain used in motor cycles is generally |
| A. | Ewast type |
| B. | Silent type |
| C. | Double roller type |
| D. | Bush roller type |
| E. | Pintle type |
| Answer» B. Silent type | |
| 174. |
In gear design, addendum is equal to |
| A. | Cast steel |
| B. | Twice of module |
| C. | One and a half times module |
| D. | Module |
| E. | Half of module |
| Answer» D. Module | |
| 175. |
Lubricant is not required in |
| A. | Increasing the diameter of threaded portion |
| B. | Electromagnetic bearing |
| C. | Hydrostatic bearings |
| D. | Gas bearings |
| E. | Foil bearing |
| Answer» B. Electromagnetic bearing | |
| 176. |
A connecting rod in an IC Engine is to be designed against buckling. The end conditions considered are |
| A. | Both the ends fixed |
| B. | Both the ends are free |
| C. | Both the ends are hinged |
| D. | none of the above |
| E. | Cast steel |
| Answer» C. Both the ends are hinged | |
| 177. |
A ball bearing cannot be provided for |
| A. | Big ends of connecting rods for I.C. engines |
| B. | Variable load shafts |
| C. | Variable speed shafts |
| D. | Automobile gear shafts |
| E. | Low speed shafts |
| Answer» A. Big ends of connecting rods for I.C. engines | |
| 178. |
Which of the following drive has accurate speed ratio? |
| A. | Flat cross-belt drive |
| B. | Timing belt drive |
| C. | V-belt 'C' section drive |
| D. | V-belt 'B' section drive |
| E. | Increasing the diameter of threaded portion |
| Answer» B. Timing belt drive | |
| 179. |
Under which condition a material ordinatily said to be ductile undergoes a fracture similar to that of a brittle material |
| A. | Cyclic loading at normal temperature |
| B. | Long time static loading at elevated temperature |
| C. | Impact loading specially at low temperatures |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 180. |
When minimum axial thrust is the criteria, the choice of gears would been |
| A. | Helical gears |
| B. | Hypoid gears |
| C. | Herringbone gears |
| D. | Worm gears |
| E. | None of the above |
| Answer» C. Herringbone gears | |
| 181. |
A compressed air cylinder carries approximately 70 kg/cm2 pressure at the time of delivery. The inside diameter is 25 cm. If the steel has a yield point of 2300 kg/sq cm and a safety factor of 2.5 the wall thickness should be |
| A. | 10 mm |
| B. | 15 mm |
| C. | 8 mm |
| D. | 12 mm |
| E. | 5 mm |
| Answer» A. 10 mm | |
| 182. |
If during operation a boiler bursts, the matter should be reported to |
| A. | State Government |
| B. | Management |
| C. | Central Government |
| D. | Boiler inspector |
| E. | Police |
| Answer» D. Boiler inspector | |
| 183. |
The compression members tend to buckle in the direction of |
| A. | Axis of load |
| B. | Perpendicular to the axis of load |
| C. | Minimum cross-section |
| D. | Least radius of gyration |
| E. | None of the above |
| Answer» D. Least radius of gyration | |
| 184. |
A concrete wall generally |
| A. | Absorbs and transmits sound |
| B. | Reflects sound |
| C. | Transmits sound |
| D. | Absorb sound |
| E. | Creates sound |
| Answer» B. Reflects sound | |
| 185. |
When the bolt is subjected to shock loading the resilience of the bolt should be considered in order to prevent breakege at |
| A. | Anywhere |
| B. | Shank |
| C. | Threaded portion |
| D. | Head |
| E. | Transition between head and shank |
| Answer» C. Threaded portion | |
| 186. |
Maximum efficiency expected in case of single mech supr gears is around |
| A. | 58% |
| B. | 98% |
| C. | 88% |
| D. | 68% |
| E. | 78% |
| Answer» B. 98% | |
| 187. |
In a gas turbine rotor a radial stress of 300 kg/sq cm tensile and 500 kg/sq cm tangential stress have been found at a point. The maximum shear stress at this point would be |
| A. | 500 kg/cm2 |
| B. | 250 kg/cm2 |
| C. | 595 kg/cm2 |
| D. | 750 kg/sq-cm |
| E. | 300 kg/cm2 |
| Answer» B. 250 kg/cm2 | |
| 188. |
The life of ball bearings as listed in catalogue represents |
| A. | 25% survival rate |
| B. | 90% survival rate |
| C. | 50% survival rate |
| D. | 75% survival rate |
| E. | Increasing the diameter of threaded portion |
| Answer» B. 90% survival rate | |
| 189. |
Rinkine-Gordon formula for buckling load is adopted for columns having slenderness ratio between |
| A. | 50 and 100 |
| B. | 30 and 50 |
| C. | 10 and 30 |
| D. | 120 and 200 |
| E. | Increasing the diameter of threaded portion |
| Answer» D. 120 and 200 | |
| 190. |
Jaw clutches |
| A. | cause shock loads when engaging |
| B. | get disengaged at high rpm |
| C. | get disengaged in reverse direction |
| D. | are friction clutches which generate heat when enegaged |
| E. | Increasing the diameter of threaded portion |
| Answer» A. cause shock loads when engaging | |
| 191. |
A rack is a gear |
| A. | With infinite diametral pitch |
| B. | With infinite pitch circle diameter |
| C. | With infinite module |
| D. | With infinite number of teeth |
| E. | With infinite circular pitch |
| Answer» D. With infinite number of teeth | |
| 192. |
Expansion joints are provided on pipes carrying |
| A. | Viscous fluids |
| B. | Water |
| C. | Air at pressures below atmospheric pressure |
| D. | Steam |
| E. | Air at high pressures |
| Answer» D. Steam | |
| 193. |
The advantage of needle roller bearing over ball bearing is |
| A. | Less friction |
| B. | Less area requirement |
| C. | Smooth operation |
| D. | Large ratio of load capacity to size |
| E. | None of the above |
| Answer» D. Large ratio of load capacity to size | |
| 194. |
A V-belt designated as C 120 will have |
| A. | 120 mm as the dia of small pulley |
| B. | 120 cm as the length of belt |
| C. | 120 inch as the length of belt |
| D. | 120 cm as the centre distance between pulleys |
| E. | None of the above |
| Answer» C. 120 inch as the length of belt | |
| 195. |
Dielectric strength of a material is |
| A. | Capacity to withstand high voltage |
| B. | Capacity to resist flow of current |
| C. | Capacity to take variable stresses |
| D. | Energy storage capacity |
| E. | Magnetic property |
| Answer» A. Capacity to withstand high voltage | |
| 196. |
According to IS 800, the lacing bars should resist a transverse shear equal to |
| A. | 7.50% |
| B. | 2.50% |
| C. | Increasing the diameter of threaded portion |
| D. | 17.50% |
| E. | 12.50% |
| Answer» B. 2.50% | |
| 197. |
The bunkers are the containers in which the plan of rupture intersects |
| A. | the opposite face (wall) near the bottom |
| B. | Increasing the diameter of threaded portion |
| C. | the opposite face (wall) near the top |
| D. | the bottom surface of material stored |
| E. | the top surface of material stored |
| Answer» E. the top surface of material stored | |
| 198. |
Laser treatment of components increases fatigue resistance of metals by |
| A. | compressing holes |
| B. | filling vacancies |
| C. | freezing discontinuities |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» C. freezing discontinuities | |
| 199. |
Failure of rolling bearings occurs mainly due to |
| A. | lubrication failure |
| B. | fatigue |
| C. | load and deformation |
| D. | Increasing the diameter of threaded portion |
| E. | plastic deformation |
| Answer» B. fatigue | |
| 200. |
In elevated circular steel tanks, conical bottoms are attached when |
| A. | Increasing the diameter of threaded portion |
| B. | water is alkaline |
| C. | water is oily |
| D. | water is acidic |
| E. | water is muddy |
| Answer» E. water is muddy | |
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