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.
| 201. |
In under damped vibrating system, if x₁ and x₂ are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to |
| A. | x₁/x₂ |
| B. | log(x₁/x₂) |
| C. | loge(x₁/x₂) |
| D. | log(x₁.x₂) |
| Answer» C. loge(x₁/x₂) | |
| 202. |
In order to give the primary balance of the reciprocating parts of a multi-cylinder inline engines |
| A. | The algebraic sum of the primary forces must be equal to zero |
| B. | The algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |
| 203. |
In order to give a complete secondary balance of a multi-cylinder inline engine, |
| A. | The algebraic sum of the secondary forces must be equal to zero |
| B. | The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |
| 204. |
The pair is known as a higher pair, when the relative motion between the elements of a pair is |
| A. | Turning only |
| B. | Sliding only |
| C. | Rolling only |
| D. | Partly turning and partly sliding |
| Answer» E. | |
| 205. |
For a kinematic chain to be considered as mechanism |
| A. | Two links should be fixed |
| B. | One link should be fixed |
| C. | None of the links should be fixed |
| D. | There is no such criterion |
| Answer» C. None of the links should be fixed | |
| 206. |
When a point moves along a straight line, its acceleration will have |
| A. | Radial component only |
| B. | Tangential component only |
| C. | Coriolis component only |
| D. | Radial and tangential components both |
| Answer» C. Coriolis component only | |
| 207. |
When a point at the end of a link moves with constant angular velocity, its acceleration will have |
| A. | Radial component only |
| B. | Tangential component only |
| C. | Coriolis component only |
| D. | Radial and tangential components both |
| Answer» B. Tangential component only | |
| 208. |
The velocity of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by |
| A. | ωR cosθ |
| B. | ω(R - r₁) cosθ |
| C. | ω(R - r₁) sinθ |
| D. | ωr₁ sinθ |
| Answer» D. ωr₁ sinθ | |
| 209. |
The acceleration of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by |
| A. | ω². (r₁ r₂). (1 - cos² θ) |
| B. | ω². (r₁ + r₂). (1 + cos² θ) |
| C. | ω². (r₁ + r₂). [(2 - cos² θ)/cos³ θ] |
| D. | ω². (r₁ - r₂). (1 - sin² θ) |
| Answer» D. ω². (r₁ - r₂). (1 - sin² θ) | |
| 210. |
The acceleration of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by |
| A. | ω² R cosθ |
| B. | ω² (R - r₁) cosθ |
| C. | ω² (R - r₁) sinθ |
| D. | ω² r₁ sinθ |
| Answer» C. ω² (R - r₁) sinθ | |
| 211. |
The size of cam depends upon |
| A. | Base circle |
| B. | Pitch circle |
| C. | Prime circle |
| D. | Pitch curve |
| Answer» B. Pitch circle | |
| 212. |
The pressure angle of a cam depends upon |
| A. | Offset between center lines of cam and follower |
| B. | Lift of follower |
| C. | Angle of ascent |
| D. | All of the above |
| Answer» E. | |
| 213. |
In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, the acceleration of the piston is _________ when the crank OC and connecting rod PC are at right angles to each other. |
| A. | Infinity |
| B. | Zero |
| C. | Any +ve value |
| D. | Any -ve value |
| Answer» C. Any +ve value | |
| 214. |
Which gear is used for connecting two coplanar and intersecting shafts? |
| A. | Spur gear |
| B. | Helical gear |
| C. | Bevel gear |
| D. | None of the above |
| Answer» D. None of the above | |
| 215. |
According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centers will lie on a |
| A. | Straight line |
| B. | Parabolic curve |
| C. | Triangle |
| D. | Rectangle |
| Answer» B. Parabolic curve | |
| 216. |
The absolute acceleration of any point ‘P’ in a link about center of rotation ‘O’ is |
| A. | Along PO |
| B. | Perpendicular to PO |
| C. | At 45° to PO |
| D. | None of the above |
| Answer» E. | |
| 217. |
The example of rolling pair is |
| A. | Bolt and nut |
| B. | Lead screw of a lathe |
| C. | Ball and socket joint |
| D. | Ball bearing and roller bearing |
| Answer» E. | |
| 218. |
To connect two parallel and coplanar shafts the following type of gearing is used |
| A. | Spur gear |
| B. | Bevel gear |
| C. | Spiral gear |
| D. | None of the above |
| Answer» B. Bevel gear | |
| 219. |
A slider moves at a velocity v on a link revolving at ω rad/s. The coriolis component of acceleration is |
| A. | ωv |
| B. | 2ωv |
| C. | ω²v |
| D. | 2ωv² |
| Answer» C. ω²v | |
| 220. |
The train value of a gear train is |
| A. | Equal to velocity ratio of a gear train |
| B. | Reciprocal of velocity ratio of a gear train |
| C. | Always greater than unity |
| D. | Always less than unity |
| Answer» C. Always greater than unity | |
| 221. |
In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle θ, the angular velocity of the connecting rod is given by |
| A. | ω sinθ/(n² - sin²θ)1/2 |
| B. | ω cosθ/(n² - cos²θ)1/2 |
| C. | ω sinθ/(n² - cos²θ)1/2 |
| D. | ω cosθ/(n² - sin²θ)1/2 |
| Answer» E. | |
| 222. |
In its simplest form, a cam mechanism consists of following number of links |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 223. |
The Coriolis component of acceleration exists whenever a point moves along a path that has |
| A. | Linear displacement |
| B. | Rotational motion |
| C. | Gravitational acceleration |
| D. | Tangential acceleration |
| Answer» C. Gravitational acceleration | |
| 224. |
In a Hartnell governor, the compression of the spring is __________ the lift of the sleeve. |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» B. Less than | |
| 225. |
The frictional torque transmitted in a truncated conical pivot bearing, considering uniform pressure, is |
| A. | (1/2). μ W cosecα (r₁ + r₂) |
| B. | (2/3). μ W cosecα (r₁ + r₂) |
| C. | (1/2). μ W cosecα [(r₁³ - r₂³)/(r₁² - r₂²)] |
| D. | (2/3). μ W cosecα [(r₁³ - r₂³)/(r₁² - r₂²)] |
| Answer» E. | |
| 226. |
The method of obtaining different mechanisms by fixing in turn different links in a kinematic chain, is known as |
| A. | Structure |
| B. | Machine |
| C. | Inversion |
| D. | Compound mechanism |
| Answer» D. Compound mechanism | |
| 227. |
Any point on a link connecting double slider crank chain will trace a |
| A. | Straight line |
| B. | Circle |
| C. | Ellipse |
| D. | Parabola |
| Answer» D. Parabola | |
| 228. |
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing) |
| A. | r sinφ |
| B. | r cosφ |
| C. | r tanφ |
| D. | (r/2) cosφ |
| Answer» B. r cosφ | |
| 229. |
Two heavy rotating masses are connected by shafts of lengths l₁, l₂ and l₃ and the corresponding diameters are d₁, d₂ and d₃. This system is reduced to a torsionally equivalent system having uniform diameter d = d₁ of the shaft. The equivalent length of the shaft is |
| A. | (l₁ + l₂ + l₃)/3 |
| B. | l = l₁ + l₂.(d₁/d₂)³ + l₂.(d₁/d₃)³ |
| C. | l = l₁ + l₂.(d₁/d₂)⁴ + l₃.(d₁/d₃)⁴ |
| D. | l₁ + l₂ + l₃ |
| Answer» D. l₁ + l₂ + l₃ | |
| 230. |
When the crank is at the outer dead centre, in a reciprocating steam engine, then the acceleration of the piston will be |
| A. | ω² r {(n + 1)/n} |
| B. | ω² r {(n - 1)/n} |
| C. | ω² r {n/(n + 1)} |
| D. | ω² r {n/(n - 1)} |
| Answer» C. ω² r {n/(n + 1)} | |
| 231. |
When the crank is at the inner dead centre, in a reciprocating steam engine, then the velocity of the piston will be |
| A. | Minimum |
| B. | Zero |
| C. | Maximum |
| D. | None of these |
| Answer» C. Maximum | |
| 232. |
When the crank is at the inner dead center, in a reciprocating steam engine, then the acceleration of the piston will be |
| A. | ω²r. (n + 1)/n |
| B. | ω²r. (n - 1)/n |
| C. | ω²r. n/(n + 1) |
| D. | ω²r. n/(n - 1) |
| Answer» B. ω²r. (n - 1)/n | |
| 233. |
The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m). (dx/dt) + (s/m). x = 0. If the roots of this equation are real, then the system will be |
| A. | Over-damped |
| B. | Under damped |
| C. | Critically damped |
| D. | Without vibrations |
| Answer» B. Under damped | |
| 234. |
If the damping factor for a vibrating system is unity, then the system will be |
| A. | Over damped |
| B. | Under damped |
| C. | Critically damped |
| D. | Without vibrations |
| Answer» D. Without vibrations | |
| 235. |
Which of the following is an inversion of a single slider crank chain? |
| A. | Pendulum pump |
| B. | Oscillating cylinder engine |
| C. | Rotary internal combustion engine |
| D. | All of these |
| Answer» E. | |
| 236. |
Which of the following is an inversion of a double slider crank chain? |
| A. | Oldham's coupling |
| B. | Elliptical trammel |
| C. | Scotch yoke mechanism |
| D. | All of these |
| Answer» E. | |
| 237. |
________ is an inversion of Double slider crank chain. |
| A. | Coupling rod of a locomotive |
| B. | Scotch yoke mechanism |
| C. | Hand pump |
| D. | Reciprocating engine |
| Answer» C. Hand pump | |
| 238. |
If ω/ωn = 2, where co is the frequency of excitation and ωn is the natural frequency of vibrations, then the transmissibility of vibration will the |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» C. 1.5 | |
| 239. |
If the opposite links of a four bar linkage are equal, the links will always form a |
| A. | Triangle |
| B. | Rectangle |
| C. | Parallelogram |
| D. | Pentagon |
| Answer» D. Pentagon | |
| 240. |
Which of the following mechanisms produces mathematically an exact straight line motion? |
| A. | Grasshopper mechanism |
| B. | Watt mechanism |
| C. | Peaucellier's mechanism |
| D. | Tchebicheff mechanism |
| Answer» D. Tchebicheff mechanism | |
| 241. |
The Coriolis component of acceleration leads the sliding velocity by |
| A. | 45° |
| B. | 90° |
| C. | 135° |
| D. | 180° |
| Answer» C. 135° | |
| 242. |
In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, if N coincides with O, then |
| A. | Acceleration and velocity of the piston P is zero |
| B. | Acceleration and velocity of the piston P is maximum |
| C. | Acceleration of the piston P is zero and its velocity is maximum |
| D. | Acceleration of the piston P is maximum and its velocity is zero |
| Answer» D. Acceleration of the piston P is maximum and its velocity is zero | |
| 243. |
The locus of a point on a thread unwound from a cylinder will be |
| A. | A straight line |
| B. | A circle |
| C. | Involute |
| D. | Cycloidal |
| Answer» D. Cycloidal | |
| 244. |
For simple harmonic motion of the of follower, a cosine curve represents |
| A. | Displacement diagram |
| B. | Velocity diagram |
| C. | Acceleration diagram |
| D. | All of the above |
| Answer» D. All of the above | |
| 245. |
Klein's construction gives a graphic construction for |
| A. | Slider-crank mechanism |
| B. | Velocity polygon |
| C. | Acceleration polygon |
| D. | Four bar chain mechanism |
| Answer» D. Four bar chain mechanism | |
| 246. |
For the same lift and same angle of ascent, a smaller base circle will give |
| A. | A small value of pressure angle |
| B. | A large value of pressure angle |
| C. | There is no such relation with pressure angle |
| D. | Something else |
| Answer» C. There is no such relation with pressure angle | |
| 247. |
Angle of action of cam is defined as the angle |
| A. | Of rotation of the cam for a definite displacement of the follower |
| B. | Through which the cam rotates during the period in which the follower remains in the highest position |
| C. | Moved by the cam from the instant the follower begins to rise, till it reaches its highest position |
| D. | Moved by the cam from beginning of ascent to the termination of descent |
| Answer» E. | |
| 248. |
The number of links and instantaneous centers in a reciprocating engine mechanism are |
| A. | 4, 4 |
| B. | 4, 5 |
| C. | 5, 4 |
| D. | 4, 6 |
| Answer» E. | |
| 249. |
Which gear train is used for higher velocity ratios in a small space? |
| A. | Simple gear train |
| B. | Compound gear train |
| C. | Reverted gear train |
| D. | Epicyclic gear train |
| Answer» E. | |
| 250. |
A combination of kinematic pairs, joined in such a way that the relative motion between the links is completely constrained, is called a |
| A. | Structure |
| B. | Mechanism |
| C. | Kinematic chain |
| D. | Inversion |
| Answer» D. Inversion | |