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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.
| 51. |
Shaft revolving in a bearing is the following type of pair |
| A. | Lower pair |
| B. | Higher pair |
| C. | Spherical pair |
| D. | Cylindrical pair |
| Answer» B. Higher pair | |
| 52. |
Rectangular bar in a rectangular hole is the following type of pair |
| A. | Completely constrained motion |
| B. | Partially constrained motion |
| C. | Incompletely constrained motion |
| D. | Freely constrained motion |
| Answer» B. Partially constrained motion | |
| 53. |
A cam with a roller follower would constitute following type of pair |
| A. | Lower pair |
| B. | Higher pair |
| C. | Open pair |
| D. | Close pair |
| Answer» C. Open pair | |
| 54. |
A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by |
| A. | 2 W CE / CS |
| B. | W CE / 2CS |
| C. | W CE / CS |
| D. | W CS / 2CE |
| Answer» C. W CE / CS | |
| 55. |
The displacement of the reciprocating roller follower, when it has contact with the straight flanks of the tangent cam, is given by (where r₁ = Minimum radius of the cam, r₂ = Radius of the roller follower, and θ = Angle turned by the cam from the beginning of the follower displacement) |
| A. | (r₁ - r₂) (1 - cosθ) |
| B. | (r₁ + r₂) (1 + cosθ) |
| C. | (r₁ - r₂) [(1 - cosθ)/cosθ] |
| D. | (r₁ + r₂) [(1 - cosθ)/cosθ] |
| Answer» E. | |
| 56. |
In a multiple V-belt drive, if one of the belts is broken, then we should replace |
| A. | The broken belt only |
| B. | All the belts |
| C. | The broken belt and the belts on either side of it |
| D. | None of the above |
| Answer» C. The broken belt and the belts on either side of it | |
| 57. |
Balancing of rotating and reciprocating parts of an engine is necessary when it runs at |
| A. | Slow speed |
| B. | Moderate speed |
| C. | Highs peed |
| D. | Any one of these |
| Answer» D. Any one of these | |
| 58. |
The magnitude of linear velocity of a point B on a link AB relative to point A is, (Where ω = Angular velocity of the link AB) |
| A. | ω × AB |
| B. | ω × (AB)² |
| C. | ω² × AB |
| D. | (ω × AB)² |
| Answer» B. ω × (AB)² | |
| 59. |
When the particles of a body moves perpendicular to its axis, then the body is said to have |
| A. | Longitudinal vibration |
| B. | Transverse vibration |
| C. | Torsional vibration |
| D. | None of these |
| Answer» C. Torsional vibration | |
| 60. |
Two systems shall be dynamically equivalent when |
| A. | The mass of two are same |
| B. | C.G. of two coincides |
| C. | M.I. of two about an axis through e.g. is equal |
| D. | All of the above |
| Answer» E. | |
| 61. |
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 | |
| 62. |
The motion of a shaft in a circular hole is an example of |
| A. | Completely constrained motion |
| B. | Incompletely constrained motion |
| C. | Successfully constrained motion |
| D. | None of these |
| Answer» C. Successfully constrained motion | |
| 63. |
The cam and follower is an example of |
| A. | Sliding pair |
| B. | Rolling pair |
| C. | Lower pair |
| D. | Higher pair |
| Answer» E. | |
| 64. |
An automobile steering gear is an example of |
| A. | Sliding pair |
| B. | Rolling pair |
| C. | Lower pair |
| D. | Higher pair |
| Answer» D. Higher pair | |
| 65. |
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 | |
| 66. |
Efficiency of a screw jack is given by |
| A. | tan (α + φ)/tanα |
| B. | tanα/tan (α +φ) |
| C. | tan (α - φ)/tanα |
| D. | tanα/tan (α - φ) |
| Answer» C. tan (α - φ)/tanα | |
| 67. |
A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when |
| A. | a is +ve and b = 0 |
| B. | a = 0 and b is +ve |
| C. | a is +ve and b is -ve |
| D. | a is +ve and b is also +ve |
| Answer» B. a = 0 and b is +ve | |
| 68. |
The direction of Coriolis component of acceleration is the direction |
| A. | Of relative velocity vector for the two coincident points rotated by 90° in the direction of the angular velocity of the rotation of the link |
| B. | Along the centripetal acceleration |
| C. | Along tangential acceleration |
| D. | Along perpendicular to angular velocity |
| Answer» B. Along the centripetal acceleration | |
| 69. |
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 | |
| 70. |
The example of lower pair is |
| A. | Shaft revolving in a bearing |
| B. | Straight line motion mechanisms |
| C. | Automobile steering gear |
| D. | All of the above |
| Answer» E. | |
| 71. |
The Kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs) |
| A. | n = 3(l - 1) - 2j - h |
| B. | n = 2(l - 1) - 2j - h |
| C. | n = 3(l - 1) - 3j - h |
| D. | n = 2(l - 1) - 3j - h |
| Answer» B. n = 2(l - 1) - 2j - h | |
| 72. |
The maximum fluctuation of energy is the |
| A. | Difference between the maximum and minimum energies |
| B. | Sum of the maximum and minimum energies |
| C. | Variations of energy above and below the mean resisting torque line |
| D. | Ratio of the mean resisting torque to the work-done per cycle |
| Answer» B. Sum of the maximum and minimum energies | |
| 73. |
A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively) |
| A. | m₁ r₂ = m₂ r₁ |
| B. | m₁ r₁ = m₂ r₂ |
| C. | m₁ m₂ = r₁ r₂ |
| D. | None of these |
| Answer» C. m₁ m₂ = r₁ r₂ | |
| 74. |
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. | |
| 75. |
Higher 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» B. Surface contact between the two elements when in motion | |
| 76. |
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 | |
| 77. |
The equation of motion for a single degree of freedom system with viscous damping is 4(dx²/dt²) + 9(dx/dt) + 16x. The damping ratio of the system is |
| A. | 9/8 |
| B. | 9/82 |
| C. | 9/16 |
| D. | 9/128 |
| Answer» D. 9/128 | |
| 78. |
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O) |
| A. | ω₁.ω₂.r |
| B. | (ω₁ - ω₂)r |
| C. | (ω₁ + ω₂)r |
| D. | (ω₁ - ω₂)2r |
| Answer» C. (ω₁ + ω₂)r | |
| 79. |
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O) |
| A. | ω₁.ω₂.r |
| B. | (ω₁ - ω₂) r |
| C. | (ω₁ + ω₂) r |
| D. | (ω₁ - ω₂) 2r |
| Answer» D. (ω₁ - ω₂) 2r | |
| 80. |
The sensitiveness of the governor __________ as the speed range decreases. |
| A. | Remains unaffected |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» D. None of these | |
| 81. |
The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead center, and n = Ratio of length of connecting rod to the radius of crank) |
| A. | ωr [sin θ + (sin 2θ/n)] |
| B. | ωr [cos θ + (cos 2θ/n)] |
| C. | ω²r [sin θ + (sin 2θ/n)] |
| D. | ω²r [cos θ + (cos 2θ/n)] |
| Answer» B. ωr [cos θ + (cos 2θ/n)] | |
| 82. |
The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank) |
| A. | m.ω².r sinθ |
| B. | m.ω².r cosθ |
| C. | m.ω².r (sin 2θ/n) |
| D. | m.ω².r (cos 2θ/n) |
| Answer» E. | |
| 83. |
The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank) |
| A. | m.ω².r sinθ |
| B. | m.ω².r cosθ |
| C. | m.ω².r (sin 2θ/n) |
| D. | m.ω².r (cos 2θ/n) |
| Answer» C. m.ω².r (sin 2θ/n) | |
| 84. |
A shaft carrying three rotors will have |
| A. | No node |
| B. | One node |
| C. | Two nodes |
| D. | Three nodes |
| Answer» D. Three nodes | |
| 85. |
The relative velocity of B with respect to A in a rigid link AB is |
| A. | Parallel to AB |
| B. | Perpendicular to AB |
| C. | Along AB |
| D. | At 45° to AB |
| Answer» C. Along AB | |
| 86. |
The unbalanced force due to revolving 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» C. Varies in magnitude and direction both | |
| 87. |
Which of the below are inversions of slider crank mechanism?1. Oscillating cylinder engine mechanism2. Toggle mechanism3. Radial cylinder engine mechanism4. Quick return mechanism |
| A. | 1, 2 and 4 |
| B. | 2, 3 and 4 |
| C. | 1, 2 and 3 |
| D. | 1, 3 and 4 |
| Answer» E. | |
| 88. |
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° | |
| 89. |
In gears, interference takes place when |
| A. | The tip of a tooth of a mating gear digs into the portion between base and root circles |
| B. | Gears do not move smoothly in the absence of lubrication |
| C. | Pitch of the gears is not same |
| D. | Gear teeth are undercut |
| Answer» B. Gears do not move smoothly in the absence of lubrication | |
| 90. |
In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of discs on the driven shaft, then the number of pairs of contact surfaces will be |
| A. | n₁ + n₂ |
| B. | n₁ + n₂ + 1 |
| C. | n₁ + n₂ - 1 |
| D. | n₁ + n₂ - 2 |
| Answer» D. n₁ + n₂ - 2 | |
| 91. |
In order to double the period of a simple pendulum, the length of the string should be |
| A. | Halved |
| B. | Doubled |
| C. | Quadrupled |
| D. | None of these |
| Answer» D. None of these | |
| 92. |
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 | |
| 93. |
A reed type tachometer use the principle of |
| A. | Longitudinal vibration |
| B. | Torsional vibration |
| C. | Transverse vibration |
| D. | Damped free vibration |
| Answer» D. Damped free vibration | |
| 94. |
The velocity of sliding of meshing gear teeth is(Where ω₁ and ω₂ are angular velocities of meshing gears and ‘y’ is distance between point of contact and the pitch point) |
| A. | (ω₁ + ω₂) y |
| B. | (ω₁/ω₂) y |
| C. | (ω₁ × ω₂) y |
| D. | (ω₁ + ω₂)/y |
| Answer» D. (ω₁ + ω₂)/y | |
| 95. |
If ω/ωn is very low 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» B. 90° | |
| 96. |
Which of the following statement is correct as regard to the difference between a machine and a structure? |
| A. | The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another |
| B. | The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only |
| C. | A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work |
| D. | All of the above |
| Answer» E. | |
| 97. |
A mechanism is an assemblage of |
| A. | Two links |
| B. | Three links |
| C. | Four or more than four links |
| D. | All of these |
| Answer» D. All of these | |
| 98. |
In a gear having involute teeth, the normal to the involute is a tangent to the |
| A. | Pitch circle |
| B. | Base circle |
| C. | Addendum circle |
| D. | Dedendum circle |
| Answer» C. Addendum circle | |
| 99. |
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 | |
| 100. |
The frequency of oscillation at compared to earth will be |
| A. | 6 times more |
| B. | 6 times less |
| C. | 2.44 times more |
| D. | 2.44 times less |
| Answer» E. | |