MCQOPTIONS
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MCQOPTIONS
This section includes 470 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 401. |
When two non-intersecting and non-coplaner shafts are connected by gears, the arrangement is known as helical gearing. |
| A. | Right |
| B. | Wrong |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 402. |
In vibration isolation system, if ω/ωn > 2, then for all values of damping factor, the trans-missibility (i.e. the ratio of the force transmitted to the force applied) will be less than unity. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 403. |
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 | |
| 404. |
In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to |
| A. | minimise the effect of primary forces |
| B. | minimise the effect of secondary forces |
| C. | have perfect balancing |
| D. | to start the locomotive quickly |
| Answer» C. have perfect balancing | |
| 405. |
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. | |
| 406. |
A kinematic chain is known as a mechanism when |
| A. | none of the links is fixed |
| B. | one of the links is fixed |
| C. | two of the links are fixed |
| D. | none of these |
| Answer» C. two of the links are fixed | |
| 407. |
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. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 408. |
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 | |
| 409. |
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 | |
| 410. |
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 | |
| 411. |
The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l1 and l2 = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body) |
| A. | l1 = kG |
| B. | l2 = kG |
| C. | l1l2 = kG |
| D. | l1l2 = kG² |
| Answer» E. | |
| 412. |
The axis of precession is __________ to the plane in which the axis of spin is going to rotate. |
| A. | parallel |
| B. | perpendicular |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 413. |
The pitching of a ship is assumed to take place with simple harmonic motion. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 414. |
The steering of a ship means |
| A. | movement of a complete ship up and down in vertical plane about transverse axis |
| B. | turning of a complete ship in a curve towards right or left, while it moves forward |
| C. | rolling of a complete ship side-ways |
| D. | none of the above |
| Answer» C. rolling of a complete ship side-ways | |
| 415. |
The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke) |
| A. | m.ω².r cos θ |
| B. | c.m.ω².r sin θ |
| C. | (1 - c)m.ω².r(cos θ - sin θ) |
| D. | m.ω².r(cos θ - sin θ) |
| Answer» D. m.ω².r(cos θ - sin θ) | |
| 416. |
The radial distance of a tooth from the pitch circle to the bottom of the tooth is called |
| A. | dedendum |
| B. | addendum |
| C. | clearance |
| D. | working depth |
| Answer» B. addendum | |
| 417. |
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. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 418. |
A mass of 1 kg is attached to the end of a spring with a stiffness of 0.7 N/mm. The critical damping coefficient of this system is |
| A. | 1.4 N-s/m |
| B. | 18.52 N-s/m |
| C. | 52.92 N-s/m |
| D. | 529.2 N-s/m |
| Answer» D. 529.2 N-s/m | |
| 419. |
In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to |
| A. | 0.2 |
| B. | 0.4 |
| C. | 0.6 |
| D. | 0.8 |
| Answer» D. 0.8 | |
| 420. |
When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to |
| A. | zero |
| B. | one |
| C. | π/2 |
| D. | π |
| Answer» C. π/2 | |
| 421. |
The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to |
| A. | 90° and 180° |
| B. | 45° and 225° |
| C. | 180° and 270° |
| D. | 270° and 360° |
| Answer» C. 180° and 270° | |
| 422. |
The sliding pairs, turning pairs and screw pairs form lower pairs. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 423. |
When a particle moves round the circumference of a circle of radius r with ω rad/s, then its maximum acceleration is ω²r. |
| A. | Right |
| B. | Wrong |
| C. | Can't say |
| D. | None of these |
| Answer» B. Wrong | |
| 424. |
A torsional system with discs of moment of inertia I1 and I2 as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 425. |
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 C Q NO. The acceleration of the piston P with respect to the crankpin C is given by |
| A. | ω² x NO |
| B. | ω² x CO |
| C. | ω² x CN |
| D. | ω² x QN |
| Answer» D. ω² x QN | |
| 426. |
In a differential band brake as shown in the below figure, if the length OB is greater than OA, then the force P at C should act in the downward direction. |
| A. | Yes |
| B. | No |
| C. | May be yes or no |
| D. | Can't say |
| Answer» C. May be yes or no | |
| 427. |
ABCD is a four bar mechanism in which AB = 310 mm and CD = 450 mm. AB and CD are both perpendicular to the fixed link AD, as shown in the below figure. If the velocity of B at this condition is v. Then the velocity of C is |
| A. | v |
| B. | 2v/3 |
| C. | 3v/2 |
| D. | 9v/4 |
| Answer» D. 9v/4 | |
| 428. |
In a spring controlled governor, when the controlling force __________ as the radius of rotation increases, it is said to be a stable governor. |
| A. | remains constant |
| B. | decreases |
| C. | increases |
| D. | None of these |
| Answer» D. None of these | |
| 429. |
The distance between the centre of suspension and centre of percussion is equal to the equivalent length of a simple pendulum. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 430. |
When the body is suspended at the point of suspension, its periodic time and frequency will be __________ as compared to the body suspended at the point of percussion. |
| A. | same |
| B. | two times |
| C. | four times |
| D. | None of these |
| Answer» B. two times | |
| 431. |
The maximum and minimum value of the tractive force is given by |
| A. | ± c.m x ω².r |
| B. | ± 2 x c.m.ω².r |
| C. | ± 2(1 - c)m x ω².r |
| D. | ± 2 x c.m x ω².r |
| Answer» D. ± 2 x c.m x ω².r | |
| 432. |
In a turning moment diagram, the variations of energy above and below the mean resisting torque line is called |
| A. | fluctuation of energy |
| B. | maximum fluctuation of energy |
| C. | coefficient of fluctuation of energy |
| D. | none of these |
| Answer» B. maximum fluctuation of energy | |
| 433. |
A pair of friction discs is an example of rolling pair. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 434. |
In a screw jack, the effort required to lower the load W is given by |
| 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» D. P = W cos(α + φ) | |
| 435. |
In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon |
| A. | total lift, total angle of lift, minimum radius of cam and cam speed |
| B. | radius of circular arc, cam speed, location of centre of circular arc and roller diameter |
| C. | mass of cam follower linkage, spring stiffness and cam speed |
| D. | total lift, centre of gravity of the cam and cam speed |
| Answer» B. radius of circular arc, cam speed, location of centre of circular arc and roller diameter | |
| 436. |
When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be |
| A. | stable |
| B. | unstable |
| C. | isochronous |
| D. | none of these |
| Answer» C. isochronous | |
| 437. |
The factor which affects the critical speed of a shaft is |
| A. | diameter of disc |
| B. | span of shaft |
| C. | eccentricity |
| D. | all of these |
| Answer» E. | |
| 438. |
The partial balancing of reciprocating parts in locomotives produces |
| A. | hammer blow |
| B. | swaying couple |
| C. | variation in tractive force along the line of stroke |
| D. | all of the above |
| Answer» E. | |
| 439. |
If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach |
| A. | 0° |
| B. | 90° |
| C. | 180° |
| D. | 360° |
| Answer» D. 360° | |
| 440. |
When the connection between the two elements is such that only required kind of relative motion occurs, it is known as self-closed pair. |
| A. | Right |
| B. | Wrong |
| C. | Can't say |
| D. | None of these |
| Answer» B. Wrong | |
| 441. |
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 | |
| 442. |
The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is |
| A. | 0° and 90° |
| B. | 0° and 180° |
| C. | 90° and 180° |
| D. | 180° and 360° |
| Answer» C. 90° and 180° | |
| 443. |
The acceleration of the particle moving with simple harmonic motion is inversely proportional to the displacement of the particle from the mean position. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 444. |
The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a right turn. The effect of gyroscopic couple acting on it will be to raise the stern and lower the bow. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 445. |
In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if ω/ωn is |
| A. | equal to one |
| B. | equal to 2 |
| C. | less than 2 |
| D. | greater than 2 |
| Answer» C. less than 2 | |
| 446. |
The gears are termed as medium velocity gears, if their peripheral velocity is |
| A. | 1 - 3 m/s |
| B. | 3 - 15 m/s |
| C. | 15 - 30 m/s |
| D. | 30 - 50 m/s |
| Answer» C. 15 - 30 m/s | |
| 447. |
Whitworth quick return motion mechanism consists of three turning pairs and one sliding pair. |
| A. | Right |
| B. | Wrong |
| C. | Can't say |
| D. | None of these |
| Answer» B. Wrong | |
| 448. |
The frequency of damped vibrations with viscous damping is __________ the frequency of undamped vibrations. |
| A. | more than |
| B. | less than |
| C. | same as |
| D. | - |
| Answer» C. same as | |
| 449. |
The gear train usually employed in clocks is a |
| A. | simple gear train |
| B. | reverted gear train |
| C. | sun and planet gear |
| D. | differential gear |
| Answer» C. sun and planet gear | |
| 450. |
In under damped vibrating system, the amplitude of vibration |
| A. | decreases linearly with time |
| B. | increases linearly with time |
| C. | decreases exponentially with time |
| D. | increases exponentially with time |
| Answer» D. increases exponentially with time | |