MCQOPTIONS
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MCQOPTIONS
This section includes 991 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Slenderness ratio is the ratio of |
| A. | Effective length of column to least radius of gyration of the column |
| B. | Width of column to depth of column |
| C. | Maximum size of column to minimum size of column |
| D. | Effective length of column to width of column |
| Answer» B. Width of column to depth of column | |
| 252. |
In a band and block brake, the ratio of tensions on the tight and slack sides of band is given by (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the centre of drum, and n = Number of blocks) |
| A. | T₁/T₂ = μθ × n |
| B. | T₁/T₂ = (μθ)n |
| C. | T₁/T₂ = [(1 - μ tanθ)/ (1 + μ tanθ)]n |
| D. | T₁/T₂ = [(1 + μ tanθ)/ (1 - μ tanθ)]n |
| Answer» E. | |
| 253. |
A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be |
| A. | 6 kN/m |
| B. | 12 kN/m |
| C. | 24 kN/m |
| D. | 30 kN/m |
| Answer» C. 24 kN/m | |
| 254. |
The centrifugal tension in the belt |
| A. | Increases the power transmitted |
| B. | Decreases the power transmitted |
| C. | Has no effect on the power transmitted |
| D. | Is equal to maximum tension on the belt |
| Answer» D. Is equal to maximum tension on the belt | |
| 255. |
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is |
| A. | 0.20 |
| B. | 0.35 |
| C. | 0.50 |
| D. | 0.65 |
| Answer» D. 0.65 | |
| 256. |
The process which improves the machinability of steels, but lowers the hardness and tensile strength is |
| A. | Normalising |
| B. | Full annealing |
| C. | Process annealing |
| D. | Spheroidising |
| Answer» E. | |
| 257. |
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value? |
| A. | Maximum principal stress theory |
| B. | Maximum shear stress theory |
| C. | Maximum strain energy theory |
| D. | Maximum distortion energy theory |
| Answer» B. Maximum shear stress theory | |
| 258. |
The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where φ = Angle of friction) |
| A. | 90° - φ |
| B. | 45° - φ |
| C. | 45° - φ/2 |
| D. | 45° + φ/2 |
| Answer» D. 45° + φ/2 | |
| 259. |
The design of pin of a rocker arm of an I.C. engine is based on |
| A. | Bearing failure |
| B. | Shearing failure |
| C. | Bending failure |
| D. | All of these |
| Answer» E. | |
| 260. |
When a helical compression spring is cut into halves, the stiffness of the resulting spring will be |
| A. | Same |
| B. | Double |
| C. | One-half |
| D. | One-fourth |
| Answer» C. One-half | |
| 261. |
When a belt drive is transmitting maximum power, |
| A. | Effective tension is equal to centrifugal tension |
| B. | Effective tension is half of centrifugal tension |
| C. | Driving tension on slack side is equal to centrifugal tension |
| D. | Driving tension on tight side is twice the centrifugal tension |
| Answer» E. | |
| 262. |
When the belt is transmitting maximum power, |
| A. | The tension in tight side is twice the centrifugal tension |
| B. | The tension in slack side is equal to the centrifugal tension |
| C. | The tension in tight side is thrice the centrifugal tension |
| D. | None of the above |
| Answer» B. The tension in slack side is equal to the centrifugal tension | |
| 263. |
The material commonly used for machine tool bodies is |
| A. | Mild steel |
| B. | Aluminium |
| C. | Brass |
| D. | Cast iron |
| Answer» E. | |
| 264. |
Euler’s formula for a mild steel column is not valid if the slenderness ratio is |
| A. | 90 |
| B. | 60 |
| C. | 120 |
| D. | 100 |
| Answer» C. 120 | |
| 265. |
A column is known as a long column if the slenderness ratio is |
| A. | 40 |
| B. | 50 |
| C. | 70 |
| D. | 100 |
| Answer» E. | |
| 266. |
In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as |
| A. | Helix angle |
| B. | Pressure angle |
| C. | Pitch lead angle |
| D. | None of these |
| Answer» B. Pressure angle | |
| 267. |
A hollow shaft will transmit a __________ torque than a solid shaft of the same mass and same material. |
| A. | Smaller |
| B. | Greater |
| C. | Medium |
| D. | None of these |
| Answer» C. Medium | |
| 268. |
In unilateral system of tolerance, the tolerance is allowed on |
| A. | Both sides of the actual size |
| B. | One side of the actual size |
| C. | One side of the nominal size |
| D. | Both sides of the nominal size |
| Answer» D. Both sides of the nominal size | |
| 269. |
The pitch diameter is the __________ diameter of an external or internal screw thread. |
| A. | Effective |
| B. | Smallest |
| C. | Largest |
| D. | None of these |
| Answer» B. Smallest | |
| 270. |
In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear. |
| A. | Right hand |
| B. | Left hand |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |
| 271. |
When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be |
| A. | W/A |
| B. | W/2A |
| C. | 2W/A |
| D. | 3W/A |
| Answer» D. 3W/A | |
| 272. |
A type of brake commonly used in motor cars is a |
| A. | Shoe brake |
| B. | Band and block brake |
| C. | Band brake |
| D. | Internal expanding brake |
| Answer» E. | |
| 273. |
The taper on key is given on |
| A. | Bottom side only |
| B. | Top side only |
| C. | On both sides |
| D. | Any side |
| Answer» C. On both sides | |
| 274. |
When a machine member is subjected to torsion, the torsional shear stress set up in the member is |
| A. | Zero at both the centroidal axis and outer surface of the member |
| B. | Maximum at both the centroidal axis and outer surface of the member |
| C. | Zero at the centroidal axis and maximum at the outer surface of the member |
| D. | Maximum at the centroidal axis and zero at the outer surface of the member |
| Answer» D. Maximum at the centroidal axis and zero at the outer surface of the member | |
| 275. |
The suitable material for belt used in flour mill is |
| A. | Leather |
| B. | Rubber |
| C. | Canvas or cotton duck |
| D. | Balata gum |
| Answer» D. Balata gum | |
| 276. |
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub) |
| A. | d/8 |
| B. | d/6 |
| C. | d/4 |
| D. | d/2 |
| Answer» D. d/2 | |
| 277. |
According to Indian standard specifications, 100 H6/g5 means that |
| A. | Tolerance grade for the hole is 6 and for the shaft is 5 |
| B. | Tolerance grade for the shaft is 6 and for the hole is 5 |
| C. | Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7 |
| D. | Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7 |
| Answer» B. Tolerance grade for the shaft is 6 and for the hole is 5 | |
| 278. |
The longitudinal joint in boilers is used to get the required |
| A. | Length of boiler |
| B. | Diameter of boiler |
| C. | Length and diameter of boiler |
| D. | Efficiency of boiler |
| Answer» C. Length and diameter of boiler | |
| 279. |
Pick up wrong statement. Fatigue strength can be increased by |
| A. | Cold working |
| B. | Shot peening |
| C. | Grinding and lapping surface |
| D. | Hot working |
| Answer» E. | |
| 280. |
The shock absorbing capacity of a bolt can be increased by |
| A. | Tightening it properly |
| B. | Increasing shank diameter |
| C. | Grinding the shank |
| D. | Making shank diameter equal to core diameter of thread |
| Answer» E. | |
| 281. |
The power transmitted by the belt drive can be increased by |
| A. | Increasing the initial tension in the belt |
| B. | Dressing the belt to increase the coefficient of friction |
| C. | Increasing wrap angle by using idler pulley |
| D. | All of the above methods |
| Answer» E. | |
| 282. |
A bolt of uniform strength can be developed by |
| A. | Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt |
| B. | Keeping the core diameter smaller than the diameter of the unthreaded portion |
| C. | Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt |
| D. | None of the above |
| Answer» B. Keeping the core diameter smaller than the diameter of the unthreaded portion | |
| 283. |
In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by |
| A. | Decreasing the cross-section area of bar |
| B. | Increasing the cross-section area of bar |
| C. | Remain unaffected with cross-section area |
| D. | Would depend upon other factors |
| Answer» B. Increasing the cross-section area of bar | |
| 284. |
The bending moment ‘M’ and a torque ‘T’ is applied on a solid circular shaft. If the maximum bending stress equals to maximum shear stress developed, then ‘M’ is equal to |
| A. | T/2 |
| B. | 1 T |
| C. | 2 T |
| D. | 4 T |
| Answer» B. 1 T | |
| 285. |
The ratio of endurance limit in shear to the endurance limit in flexure is |
| A. | 0.33 |
| B. | 0.4 |
| C. | 0.5 |
| D. | 0.55 |
| Answer» E. | |
| 286. |
The diameter of knuckle pin in a knuckle joint is usually taken as (where d = Diameter of the rod) |
| A. | 0.5 d |
| B. | 0.8 d |
| C. | d |
| D. | 1.2 d |
| Answer» D. 1.2 d | |
| 287. |
For general industrial machinery, the ratio of the length of journal to its diameter is taken as |
| A. | 0.5 to 1 |
| B. | 1 to 2 |
| C. | 3 to 5 |
| D. | 5 to 10 |
| Answer» C. 3 to 5 | |
| 288. |
The temperature at which the new grains are formed in the metal is known as |
| A. | Lower critical temperature |
| B. | Upper critical temperature |
| C. | Recrystallization temperature |
| D. | None of these |
| Answer» D. None of these | |
| 289. |
When two non-parallel or intersecting but coplanar shafts are connected by gears, the arrangement is known as, |
| A. | Bevel gearing |
| B. | Helical gearing |
| C. | Worm gearing |
| D. | None of these |
| Answer» B. Helical gearing | |
| 290. |
The difference between the upper limit and lower limit of a dimension is called |
| A. | Nominal size |
| B. | Basic size |
| C. | Actual size |
| D. | Tolerance |
| Answer» E. | |
| 291. |
A localized compressive stress at the area of contact between two members is known as |
| A. | Bending stress |
| B. | Shear stress |
| C. | Tensile stress |
| D. | Bearing stress |
| Answer» E. | |
| 292. |
The helix angle for double helical gears may be made up to |
| A. | 45° |
| B. | 60° |
| C. | 75° |
| D. | 90° |
| Answer» B. 60° | |
| 293. |
The shear stress in a beam varies from zero at the outer fibers to a maximum at the________. |
| A. | Neutral surface |
| B. | Upper surface |
| C. | Lower surface |
| D. | None of these |
| Answer» B. Upper surface | |
| 294. |
The stress in the bar when the load is applied suddenly is __________ as compared to the stress induced due to gradually applied loads. |
| A. | Same |
| B. | Double |
| C. | Three times |
| D. | Four times |
| Answer» C. Three times | |
| 295. |
The cross-section of the arm of a bell crank lever is |
| A. | Rectangular |
| B. | Elliptical |
| C. | I-section |
| D. | Any one of these |
| Answer» E. | |
| 296. |
The lead angle of a worm is 22.5°. Its helix angle will be |
| A. | 22.5° |
| B. | 45° |
| C. | 67.5° |
| D. | 90° |
| Answer» D. 90° | |
| 297. |
The belt slip occurs due to |
| A. | Heavy load |
| B. | Loose belt |
| C. | Driving pulley too small |
| D. | Any one of the above |
| Answer» E. | |
| 298. |
Rankine Gordon formula for buckling is valid for |
| A. | Long column |
| B. | Short column |
| C. | Short and long column |
| D. | Very long column |
| Answer» D. Very long column | |
| 299. |
A coupling used to connect two perfectly aligned shafts, is |
| A. | Muff coupling |
| B. | Compression coupling |
| C. | Flange coupling |
| D. | All of these |
| Answer» E. | |
| 300. |
When spring index increases, the value of Wahl's stress factor |
| A. | Increases linearly |
| B. | Decreases linearly |
| C. | Remains same |
| D. | Increases exponentially |
| Answer» E. | |