MCQOPTIONS
Saved Bookmarks
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.
| 301. |
The rotating shafts tend to vibrate violently at whirling speeds because |
| A. | The system is unbalanced |
| B. | Bearing centre line coincides with the axis |
| C. | The shafts are rotating at very high speeds |
| D. | Resonance is caused due to the heavy mass of the rotor |
| Answer» E. | |
| 302. |
Inertia force acts |
| A. | Perpendicular to the acceleration force |
| B. | Along the direction of acceleration force |
| C. | Opposite to the direction of acceleration force |
| D. | None of the above |
| Answer» D. None of the above | |
| 303. |
The arrangement is called bevel gearing, when two __________ are connected by gears. |
| A. | Intersecting and coplanar shafts |
| B. | Non-intersecting and non-coplanar shafts |
| C. | Parallel and coplanar shafts |
| D. | Parallel and non-coplanar shafts |
| Answer» B. Non-intersecting and non-coplanar shafts | |
| 304. |
The Whitworth quick return motion mechanism is formed in a slider crank chain when the |
| A. | Coupler link is fixed |
| B. | Longest link is a fixed link |
| C. | Slider is a fixed link |
| D. | Smallest link is a fixed link |
| Answer» B. Longest link is a fixed link | |
| 305. |
A point on a link connecting double slider crank chain traces a |
| A. | Ellipse |
| B. | Circle |
| C. | Parabola |
| D. | Hyperbola |
| Answer» B. Circle | |
| 306. |
The frictional torque transmitted in a conical pivot bearing, considering uniform pressure, is (where R = Radius of shaft, and α = Semi-angle of the cone) |
| A. | (1/2) μ W R cosecα |
| B. | (2/3) μ W R cosecα |
| C. | (3/4) μ W R cosecα |
| D. | μ W R cosecα |
| Answer» C. (3/4) μ W R cosecα | |
| 307. |
The motion between a pair which takes place in __________ is known as incompletely constrained motion. |
| A. | One direction only |
| B. | Two directions only |
| C. | More than one direction |
| D. | None of these |
| Answer» D. None of these | |
| 308. |
A mechanism _________ for transmitting or transforming motion. |
| A. | Can be used |
| B. | Can not be used |
| C. | Unpredictable |
| D. | None of these |
| Answer» B. Can not be used | |
| 309. |
A single degree of freedom system is given by, m × (d²x/dt²) + c × (dx/dt) + sx = F.cosω.t with usual notations. It represents |
| A. | Free vibration with damping |
| B. | Free vibration without damping |
| C. | Forced vibration with damping |
| D. | Forced vibration without damping |
| Answer» D. Forced vibration without damping | |
| 310. |
The natural frequency of free transverse vibrations due to a point load acting over a simply supported shaft is equal to (where δ = Static deflection of a simply supported shaft due to the point load) |
| A. | 0.4985/√δ |
| B. | 0.5615/√δ |
| C. | 0.571/√δ |
| D. | 0.6253/√δ |
| Answer» B. 0.5615/√δ | |
| 311. |
In a band and block brake, the ratio of tensions on tight side and slack side of the band is (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the center of drum, and n = Number of blocks) |
| A. | T₁/T₂ = μ. θ. n |
| B. | T₁/T₂ = [(1 - μ tanθ)/(1 + μ tanθ)]n |
| C. | T₁/T₂ = (μ θ)n |
| D. | T₁/T₂ = [(1 + μ tanθ)/(1 - μ tanθ)]n |
| Answer» E. | |
| 312. |
To transmit power from one rotating shaft to another whose axes are neither parallel nor intersecting, use? |
| A. | Spur gear |
| B. | Spiral gear |
| C. | Bevel gear |
| D. | Worm gear |
| Answer» E. | |
| 313. |
Which type of gearing is used in steering system of an automobile? |
| A. | Rack and pinion |
| B. | Worm and wheel |
| C. | Spiral gears |
| D. | None of the above |
| Answer» B. Worm and wheel | |
| 314. |
The inversion of a mechanism is |
| A. | Changing of a higher pair to a lower pair |
| B. | Turning its upside down |
| C. | Obtained by fixing different links in a kinematic chain |
| D. | Obtained by reversing the input and output motion |
| Answer» D. Obtained by reversing the input and output motion | |
| 315. |
Which of the following is an example of a higher pair? |
| A. | Toothed gearing |
| B. | Belt and rope drive |
| C. | Ball and roller bearing |
| D. | All of these |
| Answer» E. | |
| 316. |
Davis steering gear consists of |
| A. | Sliding pairs |
| B. | Turning pairs |
| C. | Rolling pairs |
| D. | Higher pairs |
| Answer» B. Turning pairs | |
| 317. |
Ackermann steering gear consists of |
| A. | Sliding pairs |
| B. | Turning pairs |
| C. | Rolling pairs |
| D. | Higher pairs |
| Answer» C. Rolling pairs | |
| 318. |
Which of the following mechanism is obtained from lower pair? |
| A. | Gyroscope |
| B. | Pantograph |
| C. | Valve and valve gears |
| D. | All of the above |
| Answer» E. | |
| 319. |
The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft) |
| A. | ω (r₁ r₂) sinθ |
| B. | ω (r₁ + r₂) sinθ sec2θ |
| C. | ω (r₁ r₂) cosθ |
| D. | ω (r₁ + r₂) cosθ cosec2θ |
| Answer» C. ω (r₁ r₂) cosθ | |
| 320. |
The example of higher pair is |
| A. | Belt, rope and chain drives |
| B. | Gears, cams |
| C. | Ball and roller bearings |
| D. | All of the above |
| Answer» E. | |
| 321. |
The maximum value of the pressure angle in case of cam is kept as |
| A. | 10° |
| B. | 14° |
| C. | 20° |
| D. | 30° |
| Answer» E. | |
| 322. |
The velocity of a particle moving with simple harmonic motion, at any instant is given by (where ω = Displacement of the particle from mean position) |
| A. | ω √(x² - r²) |
| B. | ω √(r² - x²) |
| C. | ω² √(x² - r²) |
| D. | ω² √(r² - x²) |
| Answer» C. ω² √(x² - r²) | |
| 323. |
The relation between the controlling force (Fc) and radius of rotation (r) for a stable spring controlled governor is |
| A. | Fc = ar + b |
| B. | Fc = ar - b |
| C. | Fc = ar |
| D. | Fc = a/r + b |
| Answer» C. Fc = ar | |
| 324. |
In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring) |
| A. | (S₁ + S₂) / h |
| B. | (S₁ - S₂) / h |
| C. | (S₁ + S₂) / 2h |
| D. | (S₁ - S₂) / 2h |
| Answer» C. (S₁ + S₂) / 2h | |
| 325. |
In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links |
| A. | Will remain same |
| B. | Will change |
| C. | Could change or remain unaltered depending on which link is fixed |
| D. | Will not occur |
| Answer» B. Will change | |
| 326. |
An exact straight line motion mechanism is a |
| A. | Scott-Russell's mechanism |
| B. | Hart's mechanism |
| C. | Peaucellier's mechanism |
| D. | All of these |
| Answer» E. | |
| 327. |
In a mechanism, the fixed instantaneous centers are those centers which |
| A. | Remain in the same place for all configurations of the mechanism |
| B. | Vary with the configuration of the mechanism |
| C. | Moves as the mechanism moves, but joints are of permanent nature |
| D. | None of the above |
| Answer» B. Vary with the configuration of the mechanism | |
| 328. |
Which of the following would constitute a link? |
| A. | Piston, piston rod and cross head |
| B. | Piston and piston rod |
| C. | Piston rod and cross head |
| D. | Piston, crank pin and crank shaft |
| Answer» B. Piston and piston rod | |
| 329. |
In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the transmissibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system) |
| A. | Less than unity |
| B. | Equal to unity |
| C. | Greater than unity |
| D. | Zero |
| Answer» D. Zero | |
| 330. |
One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where δ = Deflection of the spring) |
| A. | 2π. √(g/δ) |
| B. | 1/2π. √(g/δ) |
| C. | 2π. √(δ/g) |
| D. | 1/2π. √(δ/g) |
| Answer» C. 2π. √(δ/g) | |
| 331. |
When the pitching of a ship is __________ the effect of gyroscopic couple acting on it will be to move the ship towards port side. |
| A. | Upward |
| B. | Downward |
| C. | Forward |
| D. | Backward |
| Answer» C. Forward | |
| 332. |
For the brake to be self locking, the force P at C shown in the below figure, should |
| A. | Be zero |
| B. | Act in upward direction |
| C. | Act in downward direction |
| D. | None of these |
| Answer» B. Act in upward direction | |
| 333. |
The length of a simple pendulum which gives the same frequency as the compound pendulum, is |
| A. | kG + l₁ |
| B. | kG² + l₁ |
| C. | (kG² + l₁²)/ l₁ |
| D. | (kG + l₁²)/ l₁ |
| Answer» D. (kG + l₁²)/ l₁ | |
| 334. |
In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient. |
| A. | Equal to |
| B. | Directly proportional to |
| C. | Inversely proportional to |
| D. | Independent of |
| Answer» D. Independent of | |
| 335. |
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 P with respect to the crank-pin C is given by |
| A. | ω² × NO |
| B. | ω² × CO |
| C. | ω² × CN |
| D. | ω² × QN |
| Answer» D. ω² × QN | |
| 336. |
The velocity of the belt for maximum power is (where m = Mass of the belt in kg per meter length) |
| A. | T/3 |
| B. | (T.g)/3 |
| C. | √(T/3m) |
| D. | √(3m/T) |
| Answer» D. √(3m/T) | |
| 337. |
When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a |
| A. | Lower pair |
| B. | Higher pair |
| C. | Self-closed pair |
| D. | Force-closed pair |
| Answer» E. | |
| 338. |
Which of the following statement is correct for involute gears? |
| A. | The interference is inherently absent. |
| B. | The variation in centre distance of shafts increases radial force. |
| C. | A convex flank is always in contact with concave flank. |
| D. | The pressure angle is constant throughout the teeth engagement. |
| Answer» E. | |
| 339. |
The ratio of maximum fluctuation of energy to the work-done per cycle is called |
| A. | Fluctuation of energy |
| B. | Maximum fluctuation of energy |
| C. | Coefficient of fluctuation of energy |
| D. | None of these |
| Answer» D. None of these | |
| 340. |
In order to balance the reciprocating masses, |
| A. | Primary forces and couples must be balanced |
| B. | Secondary forces and couples must be balanced |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |
| 341. |
In involute gears, the pressure angle is |
| A. | Dependent on the size of teeth |
| B. | Dependent on the size of gears |
| C. | Always constant |
| D. | Always variable |
| Answer» D. Always variable | |
| 342. |
The minimum periodic time of a compound pendulum is |
| A. | (1/2π). √(kG/g) |
| B. | (1/2π). √(2kG/g) |
| C. | 2π. √(kG/g) |
| D. | 2π. √(2kG/g) |
| Answer» E. | |
| 343. |
The frequency of oscillation of a compound pendulum is |
| A. | 2π. √[gh/(kG² + h²)] |
| B. | 2π. √[(kG² + h²)/gh] |
| C. | (1/2π). √[gh/(kG² + h²)] |
| D. | (1/2π). √[(kG² + h²)/gh] |
| Answer» D. (1/2π). √[(kG² + h²)/gh] | |
| 344. |
The equivalent length of a simple pendulum which gives the same frequency as a compound pendulum is |
| A. | h/(kG² + h²) |
| B. | (kG² + h²)/h |
| C. | h²/(kG² + h²) |
| D. | (kG² + h²)/h² |
| Answer» C. h²/(kG² + h²) | |
| 345. |
Pitch point on a cam is |
| A. | Any point on pitch curve |
| B. | The point on cam pitch curve having the maximum pressure angle |
| C. | Any point on pitch circle |
| D. | The point on cam pitch curve having the minimum pressure angle |
| Answer» C. Any point on pitch circle | |
| 346. |
The brake commonly used in railway trains is |
| A. | Shoe brake |
| B. | Band brake |
| C. | Band and block brake |
| D. | Internal expanding brake |
| Answer» B. Band brake | |
| 347. |
Peaucellier’s mechanism has |
| A. | Eight links |
| B. | Six links |
| C. | Four links |
| D. | Twelve links |
| Answer» B. Six links | |
| 348. |
The two elements of a pair are said to form a higher pair, when they |
| 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. | Permit relative motion |
| Answer» C. Are kept in contact by the action of external forces, when in motion | |
| 349. |
Relationship between the number of links (L) and number of pairs (P) is |
| A. | P = 2L - 4 |
| B. | P = 2L + 4 |
| C. | P = 2L + 2 |
| D. | P = 2L - 2 |
| Answer» D. P = 2L - 2 | |
| 350. |
The cam follower generally used in aircraft engines is |
| A. | Knife edge follower |
| B. | Flat faced follower |
| C. | Spherical faced follower |
| D. | Roller follower |
| Answer» E. | |