McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 151. |
In gas welding the maximum flame temperature occurs at |
| A. | Inside the inner cone |
| B. | The inner cone |
| C. | Next to the inner cone |
| D. | The outer cone |
| E. | The tip of the flame |
| Answer» C. Next to the inner cone | |
| 152. |
Silicon steel is used for |
| A. | Ball bearings |
| B. | Boiler plates |
| C. | Industrial knives |
| D. | Dies |
| E. | Electrical stampings |
| Answer» E. Electrical stampings | |
| 153. |
The efficiency of abrasive particles depends up |
| A. | purity |
| B. | uniformity in composition |
| C. | hardness |
| D. | All of the above |
| E. | Parting off |
| Answer» D. All of the above | |
| 154. |
The hardness of martensite in quenched plain carbon steels reaches almost a saturation value of carbon of about |
| A. | 0.20% |
| B. | 0.40% |
| C. | 0.60% |
| D. | 1.40% |
| E. | None of the above |
| Answer» C. 0.60% | |
| 155. |
In centreless grinding the work piece advances by |
| A. | Force exerted by regulating wheel |
| B. | Remains stationalry |
| C. | Hydraulic force |
| D. | Force exerted by grinding wheel |
| E. | Push given by operator |
| Answer» A. Force exerted by regulating wheel | |
| 156. |
The power consumption in ultrasonic machining in kW/m2/min is of the order of |
| A. | 200 kW/m3/min |
| B. | 1000 kW/m3/min |
| C. | 1 kW/m3/min |
| D. | 10 kW/m3/min |
| E. | 100 kW/m3/min |
| Answer» D. 10 kW/m3/min | |
| 157. |
Shell sands are coated with |
| A. | molasses |
| B. | urea formaldehyde |
| C. | carbon disulphide |
| D. | Parting off |
| E. | silica grains |
| Answer» B. urea formaldehyde | |
| 158. |
A very soft whisper may have noise level of |
| A. | About 100 db |
| B. | About 140 db |
| C. | About 30 db |
| D. | About 40 db |
| E. | About 10 db |
| Answer» C. About 30 db | |
| 159. |
The width of slot eut by a hack-saw blade is |
| A. | None of these |
| B. | Less than the width of blade |
| C. | Slightly more than the width of blade |
| D. | Equal to the width of blade |
| E. | 1830 rpm |
| Answer» C. Slightly more than the width of blade | |
| 160. |
Swell is a defect in castings due to |
| A. | Enlargement of the mould cavity by metal pressure causing partial or overall enlargement of the casting |
| B. | Working on cooling |
| C. | Moisture in moulding sand |
| D. | Thin projection of casting due to gap between flasks |
| E. | Mis-mathcing of mould at the parting line |
| Answer» A. Enlargement of the mould cavity by metal pressure causing partial or overall enlargement of the casting | |
| 161. |
In EDM the material of the tool is |
| A. | Carbide |
| B. | Copper |
| C. | Satellite |
| D. | Diamond |
| E. | High speed steel |
| Answer» B. Copper | |
| 162. |
In a centre lathe gear box for changing spindle speeds the provision for speeds is made in |
| A. | Arithmetical progression |
| B. | Geometrical progression |
| C. | Cubical progression |
| D. | Random members |
| E. | Square progression |
| Answer» B. Geometrical progression | |
| 163. |
In rubber bond for grinding wheels, sulphur is added to |
| A. | Parting off |
| B. | act as vulcanising agent |
| C. | reduce shocks and vibrations |
| D. | make the bond flexible |
| E. | dissipate heat during grinding operation |
| Answer» B. act as vulcanising agent | |
| 164. |
Profile of a gear tooth is to be checked. Which one of the following device would you choose? |
| A. | Sine bear |
| B. | Optical projector |
| C. | Optical pyrometer |
| D. | Bench micrometer |
| E. | Telescopic gauge |
| Answer» B. Optical projector | |
| 165. |
A chisel is used for |
| A. | Cutting the wood |
| B. | Planing the wood |
| C. | Making holes in the wood |
| D. | None of the above |
| E. | Parting off |
| Answer» A. Cutting the wood | |
| 166. |
Chips with built up edge are produced while machining |
| A. | Non-ferrous materials |
| B. | Cast materials |
| C. | Hard materials |
| D. | Brittle material |
| E. | Ductile material |
| Answer» E. Ductile material | |
| 167. |
Discontinuous or segmental chips are formed while machining |
| A. | Mild steel |
| B. | Brass |
| C. | Carbon steel |
| D. | Alloy steel |
| E. | Cast iron |
| Answer» E. Cast iron | |
| 168. |
Which of the following is a single point cutting tool? |
| A. | Milling cutter |
| B. | File |
| C. | Grinding wheel |
| D. | Parting tool |
| E. | Hacksaw blade |
| Answer» D. Parting tool | |
| 169. |
While using cemented carbide tipped tools on aluminium, the cutting speed could be |
| A. | 100 - 300 m/min |
| B. | 1000 m/min |
| C. | 20 - 50 m/min |
| D. | 300 - 900 m/min |
| E. | 50 - 100 m/min |
| Answer» D. 300 - 900 m/min | |
| 170. |
A silver point is |
| A. | The temperature of equilibrium between solid silver and liquid silver at normal atmospheric pressure |
| B. | The pointed location spot silver plated |
| C. | The temperature of equilibrium between liquid silver and silver vapour at normal atmospheric pressure |
| D. | The point on a instrument dial reading beyond which may be dangerous for the system |
| E. | The temperature at which silver melts |
| Answer» A. The temperature of equilibrium between solid silver and liquid silver at normal atmospheric pressure | |
| 171. |
In order to avoid unscrewing while on a bicycle the shaft or the right padel is screwed in with |
| B. | Right hand thread |
| D. | Left hand thread |
| E. | Hysteresis |
| Answer» D. Left hand thread | |
| 172. |
The Roman notation DCCCC represents |
| A. | 900 |
| B. | 440 |
| C. | 340 |
| D. | 90 |
| E. | 140 |
| Answer» A. 900 | |
| 173. |
During arc welding eyes need to be protected against |
| A. | Microwaves |
| B. | Infrared and ultraviolet rays |
| C. | Intense glare |
| D. | X-rays and gamma rays |
| E. | High frequency waves |
| Answer» D. X-rays and gamma rays | |
| 174. |
In EDM the number of discharges perminute may be as high as |
| A. | 3000 |
| B. | 6000 |
| C. | 6,000,000 |
| D. | 60,000 |
| E. | 600,000 |
| Answer» E. 600,000 | |
| 175. |
Undercutting is |
| A. | An operation of cutting deep grooves |
| B. | None of above |
| C. | An operation of cutting a groove next to a shoulder on a piece of work |
| D. | An operation of cutting extra wide threads |
| E. | Cutting from the base of a work piece |
| Answer» C. An operation of cutting a groove next to a shoulder on a piece of work | |
| 176. |
The minimum section thickness for cast iron castings is |
| A. | 10 mm |
| B. | Parting off |
| C. | 3 mm |
| D. | 1 mm |
| E. | 6 mm |
| Answer» C. 3 mm | |
| 177. |
When large number of components are turned and parted off from a bar, the chuck used is |
| A. | Magnetic chuck |
| B. | Four jaw chuck |
| C. | Collet chuck |
| D. | Face place |
| E. | Three jaw chuck |
| Answer» C. Collet chuck | |
| 178. |
Which of the following plate can be used for milling the sides of a hexagon nut? |
| A. | Parting off |
| B. | 3 hole circle plate |
| C. | 45 hole circle plate |
| D. | 55 hole circle plate |
| E. | 24 hole circle plate |
| Answer» E. 24 hole circle plate | |
| 179. |
Stub tooth are cut on gears |
| A. | To improve transmission efficiency |
| B. | To reduce centre distance between shafts |
| C. | None of above |
| D. | To reduce frictional torque |
| E. | Subjected to shock and vibration |
| Answer» E. Subjected to shock and vibration | |
| 180. |
Porosity of a welded joint may be caused by |
| A. | Poor base metal |
| B. | Low welding current |
| C. | High welding current |
| D. | Wrong size of electrode |
| E. | None of the above |
| Answer» A. Poor base metal | |
| 181. |
Ionised material acts as transfer media in case of |
| A. | Ion beam machining |
| B. | Plasma arc machining |
| C. | Electro discharge machining |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 182. |
Scale sensitivity is defined as |
| A. | Ratio of a change in scale reading to the corresponding change in pointer deflection |
| B. | Least reading of scale/range of scale |
| C. | Least reading of scale/unit measurable quantity |
| D. | Least count of scale/range of scale |
| E. | None of the above |
| Answer» A. Ratio of a change in scale reading to the corresponding change in pointer deflection | |
| 183. |
Which one does not fit with the rest in the following |
| A. | Hammer |
| B. | Flatter |
| C. | Hot chiesel |
| D. | Reamer |
| E. | Hot punch |
| Answer» D. Reamer | |
| 184. |
Kerosene is used as a cutting fluid while machining |
| A. | Magnesium |
| B. | Low carbon steel |
| C. | Copper |
| D. | Brass |
| E. | Aluminium |
| Answer» E. Aluminium | |
| 185. |
Out of the following tools which one is expected to have highest carbon percentage |
| A. | Crowbar |
| B. | Ordinary file |
| C. | Circular saw |
| D. | Pliers |
| E. | Wrenches |
| Answer» B. Ordinary file | |
| 186. |
For welding of non-ferrous materials which of the following is preferred? |
| A. | Microwave frequency voltage |
| B. | Low frequency ac |
| C. | High frequency ac |
| D. | Direct current |
| E. | Induction heating |
| Answer» D. Direct current | |
| 187. |
As far as machinability is concerned, which of the following will be considered to be most inferior alloy? |
| A. | Malleable cast iron |
| B. | Parting off |
| C. | Monel metal |
| D. | Gun metal |
| E. | Bearing bronze |
| Answer» C. Monel metal | |
| 188. |
Precision is |
| A. | The ability of a measuring device to detect small differences in a quantity being measured |
| B. | Agreement of the result of a measurement with the true value of the measured quantity |
| C. | The ability of an instrument to reproduce same reading under identical conditions |
| D. | The repeatability of a measurement process |
| E. | Error of judgment in reading on observation |
| Answer» D. The repeatability of a measurement process | |
| 189. |
In centrifugal castings, the cores are generally made of |
| A. | Green sand and molasses |
| B. | Plastic |
| C. | Wax |
| D. | Cores are not used |
| E. | Plaster of paris |
| Answer» D. Cores are not used | |
| 190. |
In orthogoual cutting of metals the cutting edge is |
| A. | Perpendicular to the direction of tool travel |
| B. | Perpendicular to the work piece |
| C. | Perpendicular to the shear plane |
| D. | Perpendicular to the axis of cutting tool |
| E. | None of the above |
| Answer» A. Perpendicular to the direction of tool travel | |
| 191. |
Hardest abrasive is |
| A. | Aluminium oxide |
| B. | Silicon carbide |
| C. | Boron carbide |
| D. | Diamond |
| E. | Tungsten oxide |
| Answer» D. Diamond | |
| 192. |
Riser is generally located |
| A. | near the parting line |
| B. | on the upper most section of the casting |
| C. | Parting off |
| D. | opposite to the pouring end |
| E. | near the deepest section of the mould |
| Answer» B. on the upper most section of the casting | |
| 193. |
Which of the following test can be used to detect surface cracks in the welding of non-magnetic alloys? |
| A. | Fluorescent test |
| B. | Gamma ray test |
| C. | X-ray test |
| D. | Magnaflux test |
| E. | Any of the above |
| Answer» A. Fluorescent test | |
| 194. |
Which of the following process has the lowest rate of metal removal? |
| A. | Electron beam machining |
| B. | Electro discharge machining |
| C. | Abrasive jet machining |
| D. | Electro chemical machining |
| E. | Chemical machining |
| Answer» C. Abrasive jet machining | |
| 195. |
Which of the following machine is likely to be extensively used in a workshop manufacturing wire nails? |
| A. | Lathe |
| B. | Broaching machine |
| C. | Drilling machine |
| D. | Power press |
| E. | Cold heading machine |
| Answer» E. Cold heading machine | |
| 196. |
Shearing strain in the chip at shear plane is |
| A. | tan (? + ?) + cot ? |
| B. | tan (? - ?) - tan ? |
| C. | Infinite clearance |
| D. | tan (? - ?) + cot ? |
| E. | tan (? - ?) + tan ? |
| Answer» D. tan (? - ?) + cot ? | |
| 197. |
Which of the following is the most common bond used in grinding wheels? |
| A. | Shellac bond |
| B. | Pakelite bond |
| C. | Parting off |
| D. | Rubber bond |
| E. | Vitrified bond |
| Answer» E. Vitrified bond | |
| 198. |
The grain size of moulding sand is expressed in terms of |
| A. | Mean grain diameter |
| B. | Seive number |
| C. | Grain diameter |
| D. | Grain density |
| E. | Grain fitness number |
| Answer» E. Grain fitness number | |
| 199. |
Refractory metals are |
| A. | Those which can be cast in the form of bricks |
| B. | Those which reflect heat |
| C. | Those which have melting point above 1950?C |
| D. | Those which absorb heat |
| E. | Those do not malt in a normal furnace |
| Answer» C. Those which have melting point above 1950?C | |
| 200. |
Press die life is gauged by |
| A. | loss in weight |
| B. | amount of burr produced |
| C. | change of colour |
| D. | Any of the above |
| E. | Parting off |
| Answer» B. amount of burr produced | |
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