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.
| 451. |
*$_In a hydrodynamic journal bearing, there is? |
| A. | A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing |
| B. | A thick film of lubricant between the journal and the bearing |
| C. | No lubricant between the journal and the bearing |
| D. | A forced lubricant between the journal and the bearing |
| Answer» C. No lubricant between the journal and the bearing | |
| 452. |
*$_Angular acceleration of a link can be determined by dividing the? |
| A. | Centripetal component of acceleration with length of link |
| B. | Tangential component of acceleration with length of link |
| C. | Resultant acceleration with length of link |
| D. | All of the above |
| Answer» C. Resultant acceleration with length of link | |
| 453. |
*$_A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is? |
| A. | 5,367 r.p.m. |
| B. | 6,000 r.p.m. |
| C. | 9,360 r.p.m. |
| D. | 12,000 r.p.m. |
| Answer» B. 6,000 r.p.m. | |
| 454. |
*$_A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where μ = tan φ = Coefficient of friction between the plane and the body)? |
| A. | P = W tan α |
| B. | P = W tan (α + φ) |
| C. | P = W (sin α + μ cos α) |
| D. | P = W (cos α + μ sin α) |
| Answer» D. P = W (cos ≈í¬± + ≈í¬∫ sin ≈í¬±) | |
| 455. |
*$_The frequency of damped vibrations with viscous damping is ________ the frequency of undamped vibrations.? |
| A. | More than |
| B. | Less than |
| C. | Same as |
| D. | None of these |
| Answer» C. Same as | |
| 456. |
*$_In the two rotor system as shown in the below figure (I‚ÇÅ < I‚ÇÇ), a node of vibration is situated? |
| A. | Between I‚ÇÅ, and I‚ÇÇ but nearer I‚ÇÅ |
| B. | Between I‚ÇÅ, and I‚ÇÇ but nearer to I‚ÇÇ |
| C. | Exactly in the middle of the shaft |
| D. | Nearer to I‚ÇÅ but outside |
| Answer» C. Exactly in the middle of the shaft | |
| 457. |
*$_In a Hartnell governor, the lift of the sleeve is given by (where r‚ÇÅ and r‚ÇÇ = Max. and min. radii of rotation, x = Length of ball arm of the lever, and y = Length of sleeve arm of the lever)? |
| A. | (r‚ÇÅ + r‚ÇÇ) (y/x) |
| B. | (r‚ÇÅ + r‚ÇÇ) (x/y) |
| C. | (r‚ÇÅ - r‚ÇÇ) (y/x) |
| D. | (r‚ÇÅ - r‚ÇÇ) (x/y) |
| Answer» D. (r‚Äö√á√Ö - r‚Äö√á√á) (x/y) | |
| 458. |
*$_A chain comprises of 5 links having 5 joints. Is it kinematic chain?? |
| A. | Yes |
| B. | No |
| C. | It is a marginal case |
| D. | Data are insufficient to determine it |
| Answer» C. It is a marginal case | |
| 459. |
*$_Which of the following is an open pair?? |
| A. | Ball and socket joint |
| B. | Journal bearing |
| C. | Lead screw and nut |
| D. | Cam and follower |
| Answer» B. Journal bearing | |
| 460. |
*$_A circular bar moving in a round hole is an example of? |
| A. | Incompletely constrained motion |
| B. | Partially constrained motion |
| C. | Completely constrained motion |
| D. | Successfully constrained motion |
| Answer» B. Partially constrained motion | |
| 461. |
*$_Which of the following is an example of sliding pair?? |
| A. | Piston and cylinder of a reciprocating steam engine |
| B. | Shaft with collars at both ends fitted into a circular hole |
| C. | Lead screw of a lathe with nut |
| D. | Ball and a socket joint |
| Answer» B. Shaft with collars at both ends fitted into a circular hole | |
| 462. |
*$_Crowning on pulleys helps? |
| A. | In increasing velocity ratio |
| B. | In decreasing the slip of the belt |
| C. | For automatic adjustment of belt position so that belt runs centrally |
| D. | Increase belt and pulley life |
| Answer» D. Increase belt and pulley life | |
| 463. |
*$_In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is? |
| A. | 95 mm |
| B. | Slightly less than 95 mm |
| C. | Slightly more than 95 mm |
| D. | 45 mm |
| Answer» C. Slightly more than 95 mm | |
| 464. |
*$_The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is? |
| A. | Flexible coupling |
| B. | Universal coupling |
| C. | Chain coupling |
| D. | Oldham's coupling |
| Answer» C. Chain coupling | |
| 465. |
*$_Cylindrical cams can be classified as? |
| A. | Circular |
| B. | Tangent |
| C. | Reciprocating |
| D. | None of the above |
| Answer» E. | |
| 466. |
*$_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 | |
| 467. |
*$_The velocity of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by? |
| A. | ωR cosθ |
| B. | ω(R - r₁) cosθ |
| C. | ω(R - r₁) sinθ |
| D. | ωr₁ sinθ |
| Answer» D. ≈ì√¢r‚Äö√á√Ö sin≈í‚àè | |
| 468. |
*$_Davis steering gear consists of? |
| A. | Sliding pairs |
| B. | Turning pairs |
| C. | Rolling pairs |
| D. | Higher pairs |
| Answer» B. Turning pairs | |
| 469. |
*$_A cam mechanism imparts following motion? |
| A. | Rotating |
| B. | Oscillating |
| C. | Reciprocating |
| D. | All of the above |
| Answer» E. | |
| 470. |
*$_If the pressure angle is __________, a reciprocating follower will jam in its bearings.? |
| A. | Small |
| B. | Too small |
| C. | Large |
| D. | Too large |
| Answer» E. | |
| 471. |
*$_The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the? |
| A. | Unbalanced couples are caused only at higher speeds |
| B. | Unbalanced forces are not dangerous at higher speeds |
| C. | Effects of unbalances are proportional to the square of the speed |
| D. | Effects of unbalances are directly proportional to the speed |
| Answer» D. Effects of unbalances are directly proportional to the speed | |
| 472. |
*$_In a flat collar pivot bearing, the moment due to friction is proportional to? |
| A. | (r₁² - r₂²)/(r₁ - r₂) |
| B. | (r₁² - r₂²)/(r₁ + r₂) |
| C. | (r₁³ - r₂³)/(r₁² - r₂²) |
| D. | (r₁³ - r₂³)/(r₁ - r₂) |
| Answer» D. (r‚Äö√á√Ö¬¨‚â• - r‚Äö√á√ᬨ‚â•)/(r‚Äö√á√Ö - r‚Äö√á√á) | |
| 473. |
*$_The minimum force required to slide a body of weight W on a rough horizontal plane is? |
| A. | W sinθ |
| B. | W cosθ |
| C. | W tanθ |
| D. | W cosecθ |
| Answer» B. W cos≈í‚àè | |
| 474. |
*$_A spring controlled governor is said to be stable if the controlling force line when produced intersects the Y-axis? |
| A. | At the origin |
| B. | Below the origin |
| C. | Above the origin |
| D. | Any one of these |
| Answer» C. Above the origin | |
| 475. |
*$_The brake commonly used in railway trains is? |
| A. | Shoe brake |
| B. | Band brake |
| C. | Band and block brake |
| D. | Internal expanding brake |
| Answer» B. Band brake | |
| 476. |
*$_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. | |
| 477. |
*$_The minimum periodic time of a compound pendulum is? |
| A. | (1/2œÄ). ‚à ö(kG/g) |
| B. | (1/2œÄ). ‚à ö(2kG/g) |
| C. | 2œÄ. ‚à ö(kG/g) |
| D. | 2œÄ. ‚à ö(2kG/g) |
| Answer» E. | |
| 478. |
*$_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. | |
| 479. |
*$_The maximum or minimum value of the swaying couple is? |
| A. | ± c.m.ω².r |
| B. | ± a (1 - c) m.ω².r |
| C. | ¬± (a/‚à ö2) (1 - c) m.œâ¬≤.r |
| D. | ± 2a (1 - c) m.ω².r |
| Answer» D. ¬¨¬± 2a (1 - c) m.≈ì√¢¬¨‚â§.r | |
| 480. |
*$_The sense of Coriolis component is such that it? |
| A. | Leads the sliding velocity vector by 90° |
| B. | Lags the sliding velocity vector by 90° |
| C. | Is along the sliding velocity vector |
| D. | Leads the sliding velocity vector by 180° |
| Answer» B. Lags the sliding velocity vector by 90¬¨‚àû | |
| 481. |
*$_Cam size depends upon? |
| A. | Base circle |
| B. | Pitch circle |
| C. | Prime circle |
| D. | Outer circle |
| Answer» B. Pitch circle | |
| 482. |
*$_The effort of a Porter governor is equal to (where c = Percentage increase in speed, m = Mass of ball, and M = Mass on the sleeve)? |
| A. | c (m - M) g |
| B. | c (m + M) g |
| C. | c/(m + M) g |
| D. | c/(m - M) g |
| Answer» C. c/(m + M) g | |
| 483. |
*$_The type of gears used to connect two non parallel and non intersecting shafts is? |
| A. | Spur gear |
| B. | Helical gear |
| C. | Bevel gear |
| D. | Spiral gear |
| Answer» E. | |
| 484. |
*/*_The frictional torque transmitted in a truncated conical pivot bearing, considering uniform wear, is? |
| A. | (1/2). μ W cosec α (r₁ + r₂) |
| B. | (2/3).μ W cosec α (r₁ + r₂) |
| C. | (1/2). μ W cosec α [(r₁³ - r₂³)/(r₁² - r₂²)] |
| D. | (2/3). μ W cosec α [(r₁³ - r₂³)/(r₁² - r₂²)] |
| Answer» B. (2/3).≈í¬∫ W cosec ≈í¬± (r‚Äö√á√Ö + r‚Äö√á√á) | |
| 485. |
*/*_A body is said to be under forced vibrations, when? |
| A. | There is a reduction in amplitude after every cycle of vibration |
| B. | No external force acts on a body, after giving it an initial displacement |
| C. | A body vibrates under the influence of external force |
| D. | None of the above |
| Answer» B. No external force acts on a body, after giving it an initial displacement | |
| 486. |
*/*_Kinematic pairs are those which have? |
| A. | Point or line contact between the two elements when in motion |
| B. | Surface contact between the two elements when in motion |
| C. | Elements of pairs not held together mechanically |
| D. | Two elements that permit relative motion |
| Answer» E. | |
| 487. |
*/*_When brakes are applied to all the four wheels of a moving car, the distance traveled by the car before it is brought to rest, will be? |
| A. | Maximum |
| B. | Minimum |
| C. | Zero |
| D. | None of these |
| Answer» C. Zero | |
| 488. |
*/*_There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is? |
| A. | 1/24 |
| B. | 1/8 |
| C. | 4/15 |
| D. | 12 |
| Answer» B. 1/8 | |
| 489. |
*/*_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¬¨‚àû | |
| 490. |
*/*_Sensitiveness of the governor is defined as the ratio of the? |
| A. | Mean speed to the maximum equilibrium speed |
| B. | Mean speed to the minimum equilibrium speed |
| C. | Difference of the maximum and minimum equilibrium speeds to the mean speed |
| D. | Sum of the maximum and minimum equilibrium speeds to the mean speed |
| Answer» D. Sum of the maximum and minimum equilibrium speeds to the mean speed | |
| 491. |
*/*_A shaft carrying three rotors will have? |
| A. | No node |
| B. | One node |
| C. | Two nodes |
| D. | Three nodes |
| Answer» D. Three nodes | |
| 492. |
*/*_The dynamic friction is the friction experienced by a body, when the body? |
| A. | Is in motion |
| B. | Is at rest |
| C. | Just begins to slide over the surface of the other body |
| D. | None of the above |
| Answer» B. Is at rest | |
| 493. |
*/*_The coefficient of fluctuation of speed is __________ of maximum fluctuation of speed and the mean speed.? |
| A. | Sum |
| B. | Difference |
| C. | Product |
| D. | Ratio |
| Answer» E. | |
| 494. |
*/*_The lower pair is a? |
| A. | Open pair |
| B. | Closed pair |
| C. | Sliding pair |
| D. | Point contact pair |
| Answer» C. Sliding pair | |
| 495. |
*/*_In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to? |
| A. | Reduce vibration |
| B. | Reduce slip |
| C. | Ensure uniform loading |
| D. | Ensure proper alignment |
| Answer» D. Ensure proper alignment | |
| 496. |
*/*_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 | |
| 497. |
*/*_The transmissibility, for all values of damping factor, will be less than unity, if ω/ωn is? |
| A. | Equal to 1 |
| B. | Less than 2 |
| C. | Equal to 2 |
| D. | Greater than 2 |
| Answer» E. | |
| 498. |
*/*_Which of the following is a spring controlled governor?? |
| A. | Hartnell governor |
| B. | Hartung governor |
| C. | Wilson-Hartnell governor |
| D. | All of these |
| Answer» E. | |
| 499. |
*/*_When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the ________ pulley must be taken into consideration.? |
| A. | Smaller |
| B. | Larger |
| C. | Either A or B |
| D. | None of these |
| Answer» B. Larger | |
| 500. |
*/*_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 | |