MCQOPTIONS
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MCQOPTIONS
This section includes 977 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Cam angle is defined as the angle |
| A. | During which the follower returns to its initial position |
| B. | Of rotation of the cam for a definite displacement of the follower |
| C. | Through which, the cam rotates during the period in which the follower remains in the highest position |
| D. | Moved by the cam from the instant the follower begins to rise, till it reaches its highest position |
| Answer» C. Through which, the cam rotates during the period in which the follower remains in the highest position | |
| 252. |
Angle of dwell of cam is defined as the angle |
| A. | During which the follower returns to its initial position |
| B. | Of rotation of the cam for definite displacement of the follower |
| C. | Through which the cam rotates during the period in which the follower remains in the highest position |
| D. | Moved by the cam from the instant the follower begins to rise, till it reaches its highest position |
| Answer» D. Moved by the cam from the instant the follower begins to rise, till it reaches its highest position | |
| 253. |
Angle of descent of cam is defined as the angle |
| A. | During which the follower returns to its initial position |
| B. | Of rotation of the cam for a definite displacement of the follower |
| C. | Through which the cam rotates during the period in which the follower remains in the highest position |
| D. | Moved by the cam from the instant the follower begins to rise, till it reaches its highest position |
| Answer» B. Of rotation of the cam for a definite displacement of the follower | |
| 254. |
Angle of ascent of cam is defined as the angle |
| A. | During which the follower returns to its initial position |
| B. | Of rotation of the cam for a definite displacement of the follower |
| C. | Through which the cam rotates during the period in which the follower remains in highest position |
| D. | Moved by the cam from the instant the follower begins to rise, till it reaches its highest position |
| Answer» E. | |
| 255. |
In a steam engine, the link constitutes a |
| A. | Piston, piston rod and cross-head |
| B. | Connecting rod with big and small end brasses, caps and bolts |
| C. | Crank pin, crankshaft and flywheel |
| D. | All of the above |
| Answer» E. | |
| 256. |
Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts? |
| A. | Theory of machines |
| B. | Applied mechanics |
| C. | Mechanisms |
| D. | Kinetics |
| Answer» B. Applied mechanics | |
| 257. |
The secondary unbalanced force is maximum __________ in one revolution of the crank. |
| A. | Two times |
| B. | Four times |
| C. | Eight times |
| D. | Sixteen times |
| Answer» C. Eight times | |
| 258. |
The primary unbalanced force is maximum _________ in one revolution of the crank. |
| A. | Twice |
| B. | Four times |
| C. | Eight times |
| D. | Sixteen times |
| Answer» B. Four times | |
| 259. |
The two elements of a pair are said to form a _________ when they permit relative motion between them. |
| A. | Open pair |
| B. | Kinematic pair |
| C. | Sliding pair |
| D. | None of these |
| Answer» C. Sliding pair | |
| 260. |
The component of the acceleration, perpendicular to the velocity of the particle, at the given instant is called |
| A. | Radial component |
| B. | Tangential component |
| C. | Coriolis component |
| D. | None of these |
| Answer» B. Tangential component | |
| 261. |
The unbalanced force due to reciprocating masses |
| A. | Varies in magnitude but constant in direction |
| B. | Varies in direction but constant in magnitude |
| C. | Varies in magnitude and direction both |
| D. | Constant in magnitude and direction both |
| Answer» B. Varies in direction but constant in magnitude | |
| 262. |
If the number of links in a mechanism is equal to l, then the numbers of possible inversions are equal to |
| A. | l - 2 |
| B. | l - 1 |
| C. | l |
| D. | l + 1 |
| Answer» D. l + 1 | |
| 263. |
The frequency of oscillation of a torsional pendulum is |
| A. | 2πk/r. √(g/l) |
| B. | r/2πk. √(l/g) |
| C. | 2πr/k. √(g/l) |
| D. | r/2πk. √(g/l) |
| Answer» E. | |
| 264. |
TJIE horse power transmitted by a belt is dependent upon |
| A. | Tension on tight side of belt |
| B. | Tension on slack side of belt |
| C. | Radius of pulley |
| D. | All of the above |
| Answer» E. | |
| 265. |
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then |
| A. | Open belt drive is recommended |
| B. | Crossed belt drive is recommended |
| C. | Both open belt drive and crossed belt drive is recommended |
| D. | The drive is recommended depending upon the torque transmitted |
| Answer» C. Both open belt drive and crossed belt drive is recommended | |
| 266. |
Coriolis component acts |
| A. | Perpendicular to sliding surfaces |
| B. | Along sliding surfaces |
| C. | Somewhere in between above two |
| D. | None of the above |
| Answer» B. Along sliding surfaces | |
| 267. |
Which of the following is a higher pair? |
| A. | Belt and pulley |
| B. | Turning pair |
| C. | Screw pair |
| D. | Sliding pair |
| Answer» B. Turning pair | |
| 268. |
With single Hooke's joint it is possible to connect two shafts, the axes of which have an angular misalignment up to |
| A. | 10° |
| B. | 20° |
| C. | 30° |
| D. | 40° |
| Answer» E. | |
| 269. |
The Klein's diagram is useful to find |
| A. | Displacement of various parts |
| B. | Velocity of various parts |
| C. | Acceleration of various parts |
| D. | Angular acceleration of various parts |
| Answer» D. Angular acceleration of various parts | |
| 270. |
The partial balancing means |
| A. | Balancing partially revolving masses |
| B. | Balancing partially reciprocating masses |
| C. | Best balancing of engines |
| D. | All of these |
| Answer» C. Best balancing of engines | |
| 271. |
The following is the inversion of slider crank chain mechanism |
| A. | Whitworth quick return mechanism |
| B. | Hand pump |
| C. | Oscillating cylinder engine |
| D. | All of the above |
| Answer» E. | |
| 272. |
Which of the following governor is used to drive a gramophone? |
| A. | Watt governor |
| B. | Porter governor |
| C. | Pickering governor |
| D. | Hartnell governor |
| Answer» D. Hartnell governor | |
| 273. |
A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The radial component of the acceleration of B with respect to A, is (where vBA = Linear velocity of B with respect to A) |
| A. | vBA × AB |
| B. | vBA /AB |
| C. | v²BA |
| D. | v²BA /AB |
| Answer» E. | |
| 274. |
The frictional torque transmitted in a flat collar bearing, considering uniform wear, is (where r₁ and r₂ = External and internal radii of collar respectively) |
| A. | (1/2) μ W (r₁ + r₂) |
| B. | (2/3) μ W (r₁ + r₂) |
| C. | (1/2) μ W [(r₁³ - r₂³)/(r₁² - r₂²)] |
| D. | (2/3) μ W [(r₁³ - r₂³)/(r₁² - r₂²)] |
| Answer» B. (2/3) μ W (r₁ + r₂) | |
| 275. |
The frictional torque transmitted in a flat collar bearing, considering uniform pressure, is (where r₁ and r₂ = External and internal radii of collar respectively) |
| A. | (1/2). μ W (r₁ + r₂) |
| B. | (2/3). μ W (r₁ + r₂) |
| C. | (1/2). μ W [(r₁³ - r₂³)/(r₁² - r₂²)] |
| D. | (2/3). μ W [(r₁³ - r₂³)/(r₁² - r₂²)] |
| Answer» E. | |
| 276. |
Which one of the following can completely balance several masses revolving in different planes on a shaft? |
| A. | A single mass in different planes |
| B. | Two masses in any two planes |
| C. | A single mass in one of the planes of the revolving masses |
| D. | Two equal masses in any two planes |
| Answer» C. A single mass in one of the planes of the revolving masses | |
| 277. |
A cam mechanism imparts following motion |
| A. | Rotating |
| B. | Oscillating |
| C. | Reciprocating |
| D. | All of the above |
| Answer» E. | |
| 278. |
The driving and driven shafts connected by a Hooke's joint will have equal speeds, if |
| A. | cosθ = sinα |
| B. | sinθ = ± tanα |
| C. | tanθ = ± cosα |
| D. | cotθ = cosα |
| Answer» D. cotθ = cosα | |
| 279. |
The Klein's method of construction for reciprocating engine mechanism |
| A. | Is based on acceleration diagram |
| B. | Is a simplified form of instantaneous center method |
| C. | Utilizes a quadrilateral similar to the diagram of mechanism for reciprocating engine |
| D. | Enables determination of Cariole’s component |
| Answer» D. Enables determination of Cariole’s component | |
| 280. |
The critical speed of a shaft depends upon its |
| A. | Mass |
| B. | Stiffness |
| C. | Mass and stiffness |
| D. | Stiffness and eccentricity |
| Answer» D. Stiffness and eccentricity | |
| 281. |
In a single slider crank chain |
| A. | Each of the four pairs is a turning pair |
| B. | One is a turning pair and three are sliding pairs |
| C. | Two are turning pairs and two are sliding pairs |
| D. | Three are turning pairs and one is a sliding pair |
| Answer» E. | |
| 282. |
In an open pair, the two elements of a pair |
| A. | Have a surface contact when in motion |
| B. | Have a line or point contact when in motion |
| C. | Are kept in contact by the action of external forces, when in motion |
| D. | Are not held together mechanically |
| Answer» E. | |
| 283. |
The ratio of the driving tensions for V-belts is __________ times that of flat belts.(Where β = Semi-angle of the groove) |
| A. | sinβ |
| B. | cosβ |
| C. | cosecβ |
| D. | secβ |
| Answer» D. secβ | |
| 284. |
The distance by which the __________ of the D-slide valve overlaps the steam port is called exhaust lap. |
| A. | Inner edge |
| B. | Outer edge |
| C. | Corners |
| D. | None of these |
| Answer» B. Outer edge | |
| 285. |
In elliptical trammels |
| A. | All four pairs are turning |
| B. | Three pairs turning and one pair sliding |
| C. | Two pairs turning and two pairs sliding |
| D. | One pair turning and three pairs sliding |
| Answer» D. One pair turning and three pairs sliding | |
| 286. |
The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is |
| A. | 0° and 90° |
| B. | 180° and 360° |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |
| 287. |
The centre of gravity of a coupler link in a four bar mechanism will experience |
| A. | No acceleration |
| B. | Only linear acceleration |
| C. | Only angular acceleration |
| D. | Both linear and angular acceleration |
| Answer» E. | |
| 288. |
The mechanism forms a structure, when the number of degrees of freedom (n) is equal to |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | -1 |
| Answer» B. 1 | |
| 289. |
A watt's governor can work satisfactorily at speeds from |
| A. | 60 to 80 r.p.m. |
| B. | 80 to 100 r.p.m. |
| C. | 100 to 200 r.p.m. |
| D. | 200 to 300 r.p.m. |
| Answer» B. 80 to 100 r.p.m. | |
| 290. |
An engine operates between temperatures of 900°Kandr2 and another engine between T2 and 400°K For both to do equal work, value of T2 will be |
| A. | 650°K |
| B. | 600°K |
| C. | 625°K |
| D. | 700°K |
| Answer» B. 600°K | |
| 291. |
Which of the following mechanism is an approximate straight line motion mechanism? |
| A. | Watt's mechanism |
| B. | Grasshopper mechanism |
| C. | Robert's mechanism |
| D. | All of these |
| Answer» E. | |
| 292. |
The ratio of the number of teeth to the pitch circle diameter in millimeters, is called |
| A. | Circular pitch |
| B. | Diametral pitch |
| C. | Module |
| D. | None of these |
| Answer» C. Module | |
| 293. |
Klein's construction can be used to determine acceleration of various parts when the crank is at |
| A. | Inner dead centre |
| B. | Outer dead centre |
| C. | Right angles to the link of the stroke |
| D. | All of the above |
| Answer» E. | |
| 294. |
The ratio of maximum fluctuation of speed to the mean speed is called |
| A. | Fluctuation of speed |
| B. | Maximum fluctuation of speed |
| C. | Coefficient of fluctuation of speed |
| D. | None of these |
| Answer» D. None of these | |
| 295. |
The maximum fluctuation of speed is the |
| A. | Difference of minimum fluctuation of speed and the mean speed |
| B. | Difference of the maximum and minimum speeds |
| C. | Sum of maximum and minimum speeds |
| D. | Variations of speed above and below the mean resisting torque line |
| Answer» C. Sum of maximum and minimum speeds | |
| 296. |
When a slider moves on a fixed link having curved surface, their instantaneous centre lies |
| A. | On their point of contact |
| B. | At the centre of curvature |
| C. | At the centre of circle |
| D. | At the pin joint |
| Answer» C. At the centre of circle | |
| 297. |
When two links are connected by a pin joint, their instantaneous center lies |
| A. | On their point of contact |
| B. | At the center of curvature |
| C. | At the center of circle |
| D. | At the pin joint |
| Answer» E. | |
| 298. |
The approximate straight line mechanism is a |
| A. | Four bar linkage |
| B. | 6 bar linkage |
| C. | 8 bar linkage |
| D. | 3 bar linkage |
| Answer» B. 6 bar linkage | |
| 299. |
The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction) |
| A. | α = 45° + φ/2 |
| B. | α = 45° - φ/2 |
| C. | α = 90° + φ |
| D. | α = 90° - φ |
| Answer» C. α = 90° + φ | |
| 300. |
In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction) |
| A. | P = W tan(α - φ) |
| B. | P = W tan(α + φ) |
| C. | P = W tan(φ - α) |
| D. | P = W cos(α + φ) |
| Answer» C. P = W tan(φ - α) | |