McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 201. |
Small steel balls are manufactured by |
| A. | Cold heading |
| B. | Casting |
| C. | Rolling |
| D. | Turning in lathe |
| E. | Spinning |
| Answer» A. Cold heading | |
| 202. |
The casing of a water pump is generally |
| A. | Made of soft material |
| B. | Made of hard material |
| C. | Made of chilled cast iron for water resistance |
| D. | Made of non-ferrous materials |
| E. | None of the above |
| Answer» C. Made of chilled cast iron for water resistance | |
| 203. |
Bush bearings are |
| A. | Phosphor bronze |
| B. | Aluminium brass |
| C. | Mild steel |
| D. | White metal alloys |
| E. | None of the above |
| Answer» D. White metal alloys | |
| 204. |
In a cotter joint in order to ensure that cotter does not work back |
| A. | The taper on cotter should not exceed 1 in 24 |
| B. | Cotter should be made of stronger material |
| C. | The taper on cotter should be more than 1 in 24 |
| D. | Cotter should be made thick |
| E. | Shear pins should be applied on the cotter |
| Answer» A. The taper on cotter should not exceed 1 in 24 | |
| 205. |
Cold working of materials |
| A. | Increases the fatigue strength |
| B. | Reduces the fatigue strength |
| C. | Does not change fatigue strength |
| D. | Has no effect on fatigue trength |
| E. | None of the above |
| Answer» A. Increases the fatigue strength | |
| 206. |
A motor weighing 2000 kg is to be lifted by wrought iron eye bolt, screwed into the frame. Clioose-single bolt out of the following |
| A. | M 30 coarse threads |
| B. | M 12 fine threads |
| C. | None as wrought iron is brittle |
| D. | M 12 coarse threads |
| E. | M 30 Fine threads |
| Answer» A. M 30 coarse threads | |
| 207. |
An induction motor stator is cooled by |
| A. | Air |
| B. | Water |
| C. | Hydrogen |
| D. | Air and water |
| E. | None of the above |
| Answer» A. Air | |
| 208. |
The following property is the most important for normal used for gas turbine blades |
| A. | Increasing the diameter of threaded portion |
| B. | Resistance to bending |
| C. | Creep |
| D. | Fatigue |
| E. | Resistance to shear |
| Answer» C. Creep | |
| 209. |
The efficiency of a screw track is maximum when its helix angle '?' is equal to |
| A. | 45 - ? |
| B. | 45 - ?/2 |
| C. | Increasing the diameter of threaded portion |
| D. | 45 + ?/2 |
| E. | 45? |
| Answer» B. 45 - ?/2 | |
| 210. |
When a section of a beam is plastified due to given system of loading then |
| A. | the length of beam over which the moment is geater than or equal to the yield moment is plastified |
| B. | only one section of beam is plastified |
| C. | the whole length of beam is plastified |
| D. | Increasing the diameter of threaded portion |
| E. | the length of beam over which the moment is less than the yield moment is plastified |
| Answer» A. the length of beam over which the moment is geater than or equal to the yield moment is plastified | |
| 211. |
Normally a spring operates within |
| A. | Visco-elastic limits |
| B. | Plastic limits |
| C. | Para-elastic limits |
| D. | Elasto-plastic limits |
| E. | Elastic limits |
| Answer» E. Elastic limits | |
| 212. |
Non-metallic gears have |
| A. | Low noise at higher speeds and low load carrying capacity |
| B. | High noise at higher speeds and high load carrying capacity |
| C. | Low noise at higher speeds and high load carrying capacity |
| D. | Cannot be operated at higher speed. |
| E. | All of the above |
| Answer» A. Low noise at higher speeds and low load carrying capacity | |
| 213. |
What should be the thickness of a cast iron pipe 45 cm diameter if it is required to sustain 6 kg/sq cm inside pressure ? The maximum stress in the pipe material being limited to 140 kg/cm2 |
| A. | 12 mm |
| B. | 10 mm |
| C. | 7.5 mm |
| D. | 5 mm |
| E. | 15 mm |
| Answer» B. 10 mm | |
| 214. |
A stud is |
| A. | Screw with cylindrical head |
| B. | Headless scew |
| C. | Screw with circular heads |
| D. | Oval heads screw |
| E. | Screw with long threads |
| Answer» B. Headless scew | |
| 215. |
Which of the following is a positive clutch? |
| A. | Increasing the diameter of threaded portion |
| B. | Band cluch |
| C. | Jaw clutch |
| D. | Disc clutch |
| Answer» C. Jaw clutch | |
| 216. |
In case of spur gears the higher pressure angle results in |
| A. | Wider base and stronger teeth |
| B. | Weaker teeth |
| C. | Narrow base and weaker teeth |
| D. | Non-uniform motion transmission |
| E. | Begger size of gear |
| Answer» A. Wider base and stronger teeth | |
| 217. |
The pitch circle of a cam is |
| A. | The smallest circle drawn to the pitch curve |
| B. | Thesmallest circle drawn to the cam profile from the centre of rotation of a radial cam |
| C. | The circle fitting in the cam profile |
| D. | The circle with centre as the centre of cam axis and radius such that it passes through the point |
| E. | None of the above |
| Answer» D. The circle with centre as the centre of cam axis and radius such that it passes through the point | |
| 218. |
If during operation of a boiler one of the riveted joints is found leaking |
| A. | The boiler is stopped immediately |
| B. | All the riveted joints are reopened and gain riveted |
| C. | Depending upon the zone of boiler in which the joint leaks, decision is taken |
| D. | The joint is repaired if in low pressure zones otherwise boiler sent for repairs |
| E. | None of the above |
| Answer» D. The joint is repaired if in low pressure zones otherwise boiler sent for repairs | |
| 219. |
When a nut is tightened by placing a washer below it, the bolt will be subjected to |
| A. | Tension |
| B. | Torque |
| C. | Compression |
| D. | BI-axial stress |
| E. | Shear |
| Answer» A. Tension | |
| 220. |
In case of Vee belt |
| A. | The belt should not touch the bottom of groove in the pulley |
| B. | The belt should touch the bottom of groove in the fulley |
| C. | The efficiency of transmission is less |
| D. | Grooves in the pulley are generally wider than the belt |
| E. | Tension in belt remains constant throughout |
| Answer» A. The belt should not touch the bottom of groove in the pulley | |
| 221. |
Which of the following is not the advantage of V-belts over flat belts? |
| A. | Less shock load absorption |
| B. | Less axial space requirement |
| C. | Increasing the diameter of threaded portion |
| D. | Less slippage |
| E. | Less noisy |
| Answer» B. Less axial space requirement | |
| 222. |
The curve traced by a point on a line as the line rolls on another curve is known as |
| A. | Cycloid |
| B. | Involute |
| C. | Hypocycloid |
| D. | Hyperbola |
| E. | Epicycloid |
| Answer» B. Involute | |
| 223. |
The included angle in Acme threads is |
| A. | 60? |
| B. | 55? |
| C. | 50? |
| D. | 29? |
| E. | 47 |
| Answer» D. 29? | |
| 224. |
The differential equation 10x + 200 x + 810x = 0 describes one degree of freedom system. The system is |
| A. | Oscillatory |
| B. | Having critical damping |
| C. | Having more than critical damping |
| D. | Having less than critical damping |
| E. | None of the above |
| Answer» C. Having more than critical damping | |
| 225. |
A column has its equivalent length equal to its length in case of |
| A. | one end fixed, other free |
| B. | both end fixed |
| C. | one end hinged and one fixed |
| D. | both ends hinged |
| E. | Increasing the diameter of threaded portion |
| Answer» D. both ends hinged | |
| 226. |
The period during which a cam follower does not move is known as |
| A. | Free period |
| B. | Swell period |
| C. | Constant period |
| D. | Stationary period |
| E. | Fixed period |
| Answer» B. Swell period | |
| 227. |
A 3 mm diameter rivet must be squeezed to form a head. When yield stress in tension for this alloy is 125 Kpa, the minimum value of initiating force must be not less than |
| A. | 500 N |
| B. | 5000 N |
| C. | 1000 N |
| D. | Increasing the diameter of threaded portion |
| E. | 100 N |
| Answer» A. 500 N | |
| 228. |
Rankine formula is valid upto slenderness ratio of |
| A. | 100 |
| B. | 150 |
| C. | 60 |
| D. | 120 |
| E. | 80 |
| Answer» D. 120 | |
| 229. |
Tack welding |
| A. | Is a process of TIG welding |
| B. | Is a type of weld |
| C. | Is used for non-ferrous materials |
| D. | Is a preparation for welding |
| E. | None of the above |
| Answer» B. Is a type of weld | |
| 230. |
Which is the lightest? |
| A. | 10 Quintals |
| B. | 1 British ton |
| C. | 1 U.S. long ton |
| D. | 1 metric ton |
| E. | 1 U.S. short ton |
| Answer» E. 1 U.S. short ton | |
| 231. |
M 10 secrews have a pitch of |
| A. | 0.5 mm |
| B. | 1.25 mm |
| C. | 5.00 mm |
| D. | 10 mm |
| E. | 2.50 mm |
| Answer» B. 1.25 mm | |
| 232. |
Springs are used |
| A. | To store energy |
| B. | To reduce the magnitude of the transmitted force due to impact orshock |
| C. | To alter vibratory characteristics of a member |
| D. | To apply force or control motion |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 233. |
Which of the following is not a symmetrical section |
| A. | Circular |
| B. | 1 beam with equal flanges |
| C. | Equal angle iron |
| D. | All of the above |
| E. | 10 kg |
| Answer» C. Equal angle iron | |
| 234. |
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» A. 45? and 45? | |
| 235. |
A key that transmits power through frictional resistance only is |
| A. | Saddle key |
| B. | Wood ruff key |
| C. | Square key |
| D. | All of the above |
| E. | None of the above |
| Answer» A. Saddle key | |
| 236. |
The column which has the highest equivalent length has |
| A. | Both ends fixed |
| B. | One end fixed and other end free |
| C. | Both ends hinged and pin joined |
| D. | One end fixed and other end hinged |
| E. | None of the above |
| Answer» A. Both ends fixed | |
| 237. |
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» D. Conical spring are used | |
| 238. |
Lowest value of joint efficiency is assumed in case of |
| A. | Single riveted butt joints |
| B. | Double riveted butt joints |
| C. | Single riveted lap joints |
| D. | Double riveted lap joints |
| E. | None of the above |
| Answer» C. Single riveted lap joints | |
| 239. |
The rated life of a ball bearing vaires |
| A. | Inversely as cube of load |
| B. | Directly as load |
| C. | Directly as square of load |
| D. | Directly as cube of load |
| E. | Inversely as square of load |
| Answer» A. Inversely as cube of load | |
| 240. |
IC engine cylinders are lubricated by |
| A. | thin film lubricated |
| B. | thick film lubrication |
| C. | either of (A) and (B) above |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» A. thin film lubricated | |
| 241. |
Hydraulic testing of boilers is done at pressures |
| A. | Slightly above atmospheric pressure |
| B. | Below and above atmosphere |
| C. | At half the working pressure of boiler |
| D. | At 1 |
| E. | At working pressure of boiler |
| Answer» D. At 1 | |
| 242. |
In case of pressure vessels having open ends the fluid pressure induces |
| A. | shear stress |
| B. | Increasing the diameter of threaded portion |
| C. | circumferential stress |
| D. | longitudinal compressive stress |
| E. | longitudinal tensile stress |
| Answer» C. circumferential stress | |
| 243. |
Size of rivet is specified by |
| A. | Weight |
| B. | Shape |
| C. | Volume |
| D. | Shank diameter |
| E. | Diameter of head |
| Answer» D. Shank diameter | |
| 244. |
For very heavy loads which of the following gear tooth profile will be preferred? |
| A. | 20? stub involute profile |
| B. | 14 |
| C. | 14 |
| D. | 14 |
| E. | 20? full depth involute profile |
| Answer» D. 14 | |
| 245. |
How many revolutions per minute one radian per second is equal to |
| A. | 3.6 |
| B. | 5.949 |
| C. | 9.549 |
| D. | 1/3.6 |
| E. | 1 |
| Answer» C. 9.549 | |
| 246. |
Gantry girders are invariably designed to resist |
| A. | transverse and lateral loads |
| B. | Increasing the diameter of threaded portion |
| C. | transverse, lateral and axial load |
| D. | lateral loads only |
| E. | transverse loads only |
| Answer» C. transverse, lateral and axial load | |
| 247. |
The size of the fillet weld is given by |
| A. | throat of the fillet |
| B. | Increasing the diameter of threaded portion |
| C. | smaller size of the plate welded |
| D. | smaller side of the triangle |
| E. | hypotenuse of the triangle |
| Answer» D. smaller side of the triangle | |
| 248. |
Cast iron bearings are used |
| A. | for reciprocating and oscillating motions only |
| B. | Increasing the diameter of threaded portion |
| C. | when space is the major consideration |
| D. | when cost is the major consideration |
| E. | for under water applications |
| Answer» D. when cost is the major consideration | |
| 249. |
Splined shafts are most commonly used in |
| A. | aircrafts |
| B. | machine tools |
| C. | automobiles |
| D. | none of the above |
| E. | Cast steel |
| Answer» C. automobiles | |
| 250. |
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» D. Directly proportional to d4 | |
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