

McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
251. |
The column splice is used to increase |
A. | strength of the column |
B. | cross-sectional area of the column |
C. | length of the column |
D. | all of the above |
E. | Increasing the diameter of threaded portion |
Answer» C. length of the column |
252. |
For which of the following gears noise level is low |
A. | cast iron gears |
B. | alloys steel gears |
C. | non metallic gears |
D. | none of the above |
E. | Cast steel |
Answer» C. non metallic gears |
253. |
For steel ultimate strength in tension compared to that in shear is |
A. | 1?2 |
B. | 3?2 |
C. | Same |
D. | 2?3 |
E. | 2?1 |
Answer» B. 3?2 |
254. |
In a ball bearing a sleeve is fixed to |
A. | To protect bearing against dust etc. |
B. | Reduce friction |
C. | Prevent relative axial movement between the shaft and bearing |
D. | Carry more load |
E. | Reduce wear |
Answer» C. Prevent relative axial movement between the shaft and bearing |
255. |
Resilience : Strain energy : |
A. | Increasing the diameter of threaded portion |
B. | Velocity : Kinetic energy |
C. | Bulk modulus : Elasticity |
D. | Potential energy : Kinetic energy |
E. | Moment : Momentum |
Answer» B. Velocity : Kinetic energy |
256. |
A boiler shell 280 cm diameter and plate thickness 12 mm is subjected to an internal pressure of 1.2 MN/m2. The hoop stress will be |
A. | 155.5 N/m2 |
B. | 60 N/m2 |
C. | 45 N/m2 |
D. | 135 N/m2 |
E. | 180 N/m2 |
Answer» B. 60 N/m2 |
257. |
The amount of energy required upto fracture is known as |
A. | Fatigue strength |
B. | Chrome steel |
C. | Toughness |
D. | Damping effect |
E. | Creep strength |
Answer» C. Toughness |
258. |
Which threads have better fatigue characteristics? |
B. | Threads cut by taps |
C. | Threads cut by rolling |
D. | Increasing the diameter of threaded portion |
E. | Threads cut on lathe |
Answer» C. Threads cut by rolling |
259. |
The minimum thickness of steel members exposed to weather and accessible for paintng is |
A. | 8 mm |
B. | 10 mm |
C. | Increasing the diameter of threaded portion |
D. | 6 mm |
E. | 4 mm |
Answer» B. 10 mm |
260. |
In case of automobile body work the type of welding generally used is |
A. | Arc welding |
B. | Submerged are welding |
C. | Spot welding |
D. | Gas welding |
E. | Seam welding |
Answer» C. Spot welding |
261. |
A steel that has been deoxidized with a strong de-oxidizing agent, such as Silicon or Aluminium in order to eliminate a reaction between C and O2 during solidification, is known as |
A. | Soft steel |
B. | Kolled steel |
C. | De-oxidised steel |
D. | Oxidised steel |
E. | Anodised steel |
Answer» B. Kolled steel |
262. |
Shear strain energy theory of the failure of a material at elastic limit is due to |
A. | Rankine |
B. | Increasing the diameter of threaded portion |
C. | Haig |
D. | St. Venant |
E. | Von Mises |
Answer» E. Von Mises |
263. |
The cam used for high speed engines is |
A. | Cycloidal |
B. | Involute |
C. | Flat |
D. | Uniform acceleration |
E. | Tangent |
Answer» A. Cycloidal |
264. |
The Euler's formula for columns is valid for |
A. | Increasing the diameter of threaded portion |
B. | large slenderness ratio |
C. | all slenderness ratios |
D. | zero slendemess ratio |
E. | small slenderness ratio |
Answer» B. large slenderness ratio |
265. |
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» E. 4?3 |
266. |
Which of the following is used as bearing lines |
A. | Brass |
B. | Cast iron |
C. | Babbit metal |
D. | Cast steel |
E. | Aluminium |
Answer» C. Babbit metal |
267. |
A bushed pin flexible type coupling is used to join two shafts which |
A. | Are not in exact alignment |
B. | Are not coplanar |
C. | Change position during operation |
D. | Are inclined |
E. | None of the above |
Answer» A. Are not in exact alignment |
268. |
For a circular section the ratio of the plastic moment capacity to the yield moment capacity is |
A. | 1.44 |
B. | 1.1 |
C. | Increasing the diameter of threaded portion |
D. | 1.86 |
E. | 1.7 |
Answer» E. 1.7 |
269. |
Snap head rivets are used in |
A. | Structural work |
B. | Ship building |
C. | Aircraft body |
D. | Any of the above |
E. | None of the above |
Answer» A. Structural work |
270. |
In oilless bearings |
A. | There is no external supply of lubricant |
B. | The lubrication is achieved by adding sulid lubricants |
C. | Grease is used for lubrication |
D. | Graphite is used for lubrication |
E. | None of the above |
Answer» A. There is no external supply of lubricant |
271. |
Maximum principal stress theory is applicable for |
A. | Elastic materials |
B. | Plastic materials |
C. | Ductile materials |
D. | Brittle materials |
E. | None of the above |
Answer» D. Brittle materials |
272. |
On a triple thread screw |
A. | Lead = 2 x pitch |
B. | Lead = 3 x pitch |
C. | Lead = pitch |
D. | Pitch = 3 x lead |
E. | Pitch = 2 x lead |
Answer» B. Lead = 3 x pitch |
273. |
A pair of straight tooth bevel gears connects a pair of shafts at 90?. The velocity ratio is 3:1. The cone ptich angle of the pinion will be |
A. | 22.5? |
B. | 71.6? |
C. | 30? |
D. | 18.4? |
E. | 60? |
Answer» D. 18.4? |
274. |
Key normally used in wrist watch is |
A. | Kenned key |
B. | Sunk key |
C. | Tangent key |
D. | Woodruff key |
E. | None of the above |
Answer» E. None of the above |
275. |
Cap screws are |
A. | Unsed in furniture work only |
B. | Used on sheet metal work only and are generally self-threading type |
C. | Used by welding to the structure for relative location of parts |
D. | Similar to small size bolts except that a great variety of shades of heads are available |
E. | Generally nickel plated and used where external show is important |
Answer» D. Similar to small size bolts except that a great variety of shades of heads are available |
276. |
Gears preferred for minimum axial thrust are |
A. | Helical gears |
B. | Worm gears |
C. | Hypoid gears |
D. | Herring bone gears |
E. | Any of the above |
Answer» D. Herring bone gears |
277. |
In case of springs in order to achieve greater load carrying capacity when the outer diameter is limited |
A. | Square section is used |
B. | Elliptical section is used |
C. | Rectangular section is used |
D. | Concentric springs are used |
E. | None of the above |
Answer» D. Concentric springs are used |
278. |
In the Laminated springs, the flat plates of different lengths are provided for |
A. | Reducing deflection |
B. | Appearance |
C. | Economy |
D. | Equal distribution of stress |
E. | Reducing bulk |
Answer» D. Equal distribution of stress |
279. |
The most common material for the balls and races of ball bearings is |
A. | High carbon steel |
B. | High speed steel |
C. | high chromium steel |
D. | none of the above |
E. | Cast steel |
Answer» C. high chromium steel |
280. |
A key seldom fails in |
A. | Increasing the diameter of threaded portion |
B. | tearing |
C. | shearing |
E. | crushing |
Answer» B. tearing |
281. |
A suspended body is to be struck heavily without producing any reaction at the support. It should be hit at |
A. | Centre of spin |
B. | Centre of gravity |
C. | Metacentre |
D. | Centroid |
E. | Centre of percussion |
Answer» E. Centre of percussion |
282. |
Beams composed of more than one material, regidly connected so as to behave as one piece are known as |
A. | determinate beams |
B. | inditerminate beams |
C. | Increasing the diameter of threaded portion |
D. | composite beams |
E. | compound beams |
Answer» D. composite beams |
283. |
Low pressure angle on gears is likely to result in |
A. | Weaker teeth |
B. | Abrasion |
C. | Wear |
D. | Pitting |
E. | Stronger teeth |
Answer» A. Weaker teeth |
284. |
The trunions of a mixing machine have an effective length of 30 cm and the weight coming on each trunion is 1250 kg. If the fibre stress is not to exceed 350 kg/sq-cm the diameter of the trunions should be |
A. | 6 cm |
B. | 8 cm |
C. | 12 cm |
D. | 4 cm |
E. | 10 cm |
Answer» B. 8 cm |
285. |
The holding power of a saddle key is due to |
A. | Torsion |
B. | Shear force |
C. | Compressive force |
D. | Friction force |
E. | Tensile force |
Answer» D. Friction force |
286. |
In order to minimise jerks, the type of cam used is |
A. | Cycloidal |
B. | Hyperbolic |
C. | S.H.M. |
D. | Cylindrical |
E. | Parabolic |
Answer» A. Cycloidal |
287. |
Which of the following bearing will have least coefficient of friction? |
A. | Cylindrical foller bearing |
B. | Tapered bearing |
C. | Single ball bearing |
D. | Thrust ball bearing |
E. | Self-aligning bearing |
Answer» B. Tapered bearing |
288. |
Abrasion wear of gear tooth occurs due to |
A. | Poor lubrication |
B. | Fatigue |
C. | Presence of foreign particles |
D. | Excessive load |
E. | Any of the above |
Answer» C. Presence of foreign particles |
289. |
A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw is called |
A. | castle nut |
B. | jam nut |
C. | sawn nut |
D. | ring nut |
E. | Increasing the diameter of threaded portion |
Answer» D. ring nut |
290. |
The angle through which a gear turns from the beginning of contact of a pair of teeth until the contact reaches the pitch point, is known as |
A. | Angle of approach |
B. | Angle of action |
C. | Angle of contact |
D. | Pressure angle |
E. | Approach angle |
Answer» A. Angle of approach |
291. |
The surface endurance limit of gear material is dependent on its |
A. | Toughness |
B. | Surface hardness |
C. | Surface lubrication |
D. | Elastic strength |
E. | Coefficient of friction |
Answer» B. Surface hardness |
292. |
Yield point in static loading as compared to that in fatigue loading is |
A. | Depends on composition of material |
B. | Same |
C. | Lower |
D. | Higher |
E. | Depends on loading rate |
Answer» D. Higher |
293. |
Slenderness ratio of the lacing bar for compression member should not exceed |
A. | 125 |
B. | Increasing the diameter of threaded portion |
C. | 100 |
D. | 175 |
E. | 145 |
Answer» E. 145 |
294. |
The value of load factor which accounts for margin of safety in plastic design for gravity loads is about |
A. | 1.85 |
B. | 2.15 |
C. | Increasing the diameter of threaded portion |
D. | 1.25 |
E. | 1.55 |
Answer» A. 1.85 |
295. |
The purpose of providing multiple collars on a flat collar pivot bearing is to |
A. | Increase frictional resistance |
B. | Establish self-substaining bearing condition |
C. | Distribute the frictional load because of limiting frictional resistance |
D. | Distribute the axial load becase of limiting bearing pressure on a collar |
E. | None of the above |
Answer» D. Distribute the axial load becase of limiting bearing pressure on a collar |
296. |
Bolted joints often fail in |
A. | tension only |
B. | compresson only |
C. | torsion only |
D. | Increasing the diameter of threaded portion |
E. | shear only |
Answer» A. tension only |
297. |
A series of continuous spot welds |
A. | dot matrix |
B. | Increasing the diameter of threaded portion |
C. | stitch weld |
D. | butt weld |
E. | seam weld |
Answer» E. seam weld |
298. |
A shaft coupling should |
A. | hold the two shafts in perfect alignment |
B. | have no projecting parts |
C. | have all the above characteristics |
D. | Cast steel |
E. | transmit full power of the shaft |
Answer» C. have all the above characteristics |
299. |
Eye bolts are used for |
A. | Locking devices |
B. | Transmission of power |
C. | Absorption of shocks and vibrations |
D. | Lifting and transporting heavy pieces |
E. | None of the above |
Answer» D. Lifting and transporting heavy pieces |
300. |
The most common material used for rivets is |
A. | cast iron |
B. | malleable cast iron |
C. | mild steel |
D. | none of the above |
E. | Cast steel |
Answer» C. mild steel |
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