MCQOPTIONS
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MCQOPTIONS
This section includes 220 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. |
The example of completely constrained motion is a |
| A. | motion of a piston in the cylinder of a steam engine |
| B. | motion of a square bar in a square hole |
| C. | motion of a shaft with collars at each end in a circular hole |
| D. | all of the above |
| Answer» E. | |
| 52. |
A shaft carrying three rotors will have |
| A. | no node |
| B. | one node |
| C. | two nodes |
| D. | three nodes |
| Answer» D. three nodes | |
| 53. |
Which of the following statement is correct for gears ? |
| A. | The addendum is less than the dedendum |
| B. | The pitch circle diameter is the product of module and number of teeth |
| C. | The contact ratio means the number of pairs of teeth in contact |
| D. | all of the above |
| Answer» E. | |
| 54. |
In order to facilitate starting of locomotive in any position, the cranks of a locomotive with two cylinders, are placed at |
| A. | 45° to each other |
| B. | 90° to each other |
| C. | 120° to each other |
| D. | 180° to each other |
| Answer» C. 120° to each other | |
| 55. |
In full depth involute system, the smallest number of teeth in a pinion which meshes with rack without interference is |
| A. | 12 |
| B. | 16 |
| C. | 25 |
| D. | 32 |
| Answer» E. | |
| 56. |
The effect of swaying couple in a locomotive is resisted by the side pressure between the flanges of the tyres of the wheel and the inside of the rails. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 57. |
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 | |
| 58. |
The equation of motion for a single degree of freedom system with viscous damping is . The damping ratio of the system is |
| A. | 9/8 |
| B. | 9/8 |
| C. | 9/16 |
| D. | 9/128 |
| Answer» D. 9/128 | |
| 59. |
The ratio of the number of teeth to the pitch circle diameter in millimetres, is called |
| A. | circular pitch |
| B. | diametral pitch |
| C. | module |
| D. | none of these |
| Answer» C. module | |
| 60. |
The ratio of the pitch circle diameter in millimetres to the number of teeth, is called circular pitch. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 61. |
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. | |
| 62. |
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. | |
| 63. |
The mechanism in which two are turning pairs and two are sliding pairs, is called a |
| A. | double slider crank chain |
| B. | elliptical trammel |
| C. | Scotch yoke mechanism |
| D. | all of these |
| Answer» E. | |
| 64. |
In a multiple V-belt drive, all the belts should stretch at the same rate. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 65. |
In a reciprocating engine, usually __________ of the reciprocating masses are balanced. |
| A. | one-half |
| B. | two-third |
| C. | three-fourth |
| D. | whole |
| Answer» C. three-fourth | |
| 66. |
A shaft of mass ()and stiffness () is fixed at one end and carries a mass () at the other end. The natural frequency of its transverse vibration is same as for longitudinal vibration. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 67. |
In vibration isolation system, if ω/ω > , 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 |
| Answer» B. False | |
| 68. |
The length of a simple pendulum which gives the same frequency as the compound pendulum, is |
| A. | + |
| B. | + |
| Answer» D. | |
| 69. |
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 | |
| 70. |
A slender shaft supported on two bearings at its ends carries a disc with an eccentricity from the axis of rotation. The critical speed of the shaft is . If the disc is replaced by a second one of same mass but mounted with an eccentricily 2 , then the critical speed of the shaft in the second case is |
| A. | / |
| B. | /2 |
| C. | 2 |
| Answer» B. /2 | |
| 71. |
The angle of inclination of the plane, at which the body begins to move down the plane is called |
| A. | angle of friction |
| B. | angle of repose |
| C. | angle of projection |
| D. | none of these |
| Answer» C. angle of projection | |
| 72. |
When the connection between the elements forming a pair is such that the constrained motion is not completed by itself, but by some other means, the motion is said to be a completely constrained motion, |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 73. |
The ratio of the driving tensions for V-belts is __________ times that of flat belts. (where β = Semi-angle of the groove) |
| A. | sin β |
| B. | cos β |
| C. | cosec β |
| D. | sec β |
| Answer» D. sec β | |
| 74. |
In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater tension acts at and smaller tension at . Length is greater than length . In order to apply the brake, the force at should |
| A. | be zero |
| B. | act in upward direction |
| C. | act in downward direction |
| D. | none of the above |
| Answer» D. none of the above | |
| 75. |
The periodic time of a compound pendulum is __________ when the distance between the point of suspension and the centre of gravity is equal to the radius of gyration of the body about its centre of gravity. |
| A. | zero |
| B. | minimum |
| C. | maximum |
| Answer» C. maximum | |
| 76. |
The unbalanced force due to reciprocating 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» B. varies in direction but constant in magnitude | |
| 77. |
The relation = ( + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to |
| A. | one lower pair and two additional links |
| B. | two lower pairs and one additional link |
| C. | two lower pairs and two additional links |
| D. | any one of these |
| Answer» C. two lower pairs and two additional links | |
| 78. |
According to law of gearing, the common normal at the point of contact between a pair of teeth must always pass through the pitch point. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 79. |
The motion between a pair which takes place in __________ is known as incompletely constrained motion. |
| A. | one direction only |
| B. | more than one direction |
| Answer» C. | |
| 80. |
The equation of free vibrations of a system is , Its natural frequency is |
| A. | 3 Hz |
| B. | 3π Hz |
| C. | 6 Hz |
| D. | 6π Hz |
| Answer» B. 3π Hz | |
| 81. |
When the primary direct crank of a reciprocating engine makes an angle of θ with the line of stroke, then the secondary direct crank will make an angle of __________ with the line of stroke. |
| A. | θ/2 |
| B. | θ |
| C. | 2 θ |
| D. | 4 θ |
| Answer» D. 4 θ | |
| 82. |
Two heavy rotating masses are connected by shafts of lengths , and and the corresponding diameters are , and . This system is reduced to a torsionally equivalent system having uniform diameter = of the shaft. The equivalent length of the shaft is |
| A. | + |
| B. | + |
| Answer» D. | |
| 83. |
point on a rigid link moves with respect to with angular velocity ω rad/s. The angular acceleration of the link is (where and = Radial and tangential components of the acceleration of with respect to ) |
| A. | x |
| Answer» C. | |
| 84. |
In order to give a complete secondary balance of a multi-cylinder in-line 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 | |
| 85. |
point on a rigid link moves with respect to with angular velocity ω rad/s. The total acceleration of with respect to will be equal to |
| A. | vector sum of radial component and coriolis component |
| B. | vector sum of tangential component and coriolis component |
| C. | vector sum of radial component and tangential component |
| D. | vector difference of radial component and tangential component |
| Answer» D. vector difference of radial component and tangential component | |
| 86. |
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 | |
| 87. |
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 | |
| 88. |
The pitching of a ship is assumed to take place with simple harmonic motion. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 89. |
In a simple train of wheels, if the number of intermediate wheels is odd, the motion of the follower will be same as that of the driver. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 90. |
The frictional torque transmitted in a flat pivot bearing, considering uniform pressure, is (where μ = Coefficient of friction, = Load over the bearing, and = Radius of bearing surface) |
| A. | μ |
| B. | μ |
| C. | μ |
| D. | μ |
| Answer» C. μ | |
| 91. |
In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from |
| A. | 10° - 15° |
| B. | 15° - 25° |
| C. | 25° - 30° |
| D. | 30° - 40° |
| Answer» D. 30° - 40° | |
| 92. |
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 |
| Answer» C. | |
| 93. |
There are six gears , , , , and 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 () to the driver () of the drive is |
| A. | 1/24 |
| B. | 1/8 |
| C. | 4/15 |
| D. | 12 |
| Answer» B. 1/8 | |
| 94. |
The natural frequency of free transverse vibrations is same as that of free longitudinal vibrations. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 95. |
The throw of the eccentric is equal to the valve travel. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 96. |
A mechanism consisting of more than four links is called a compound mechanism. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 97. |
The addendum is the radial distance of tooth from the pitch circle to the top of the tooth. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 98. |
The height of a Watt's governor (in metres) is equal to (where = Speed of the arm and ball about the spindle axis) |
| A. | 8.95/ |
| B. | 89.5/ |
| C. | 895/ |
| D. | 8950/ |
| Answer» D. 8950/ | |
| 99. |
The relative velocity of with respect to in a rigid link is |
| A. | parallel to |
| B. | perpendicular to |
| C. | along |
| D. | at 45° to |
| Answer» C. along | |
| 100. |
If the pressure angle is __________ , a reciprocating follower will jam in its bearings. |
| A. | too small |
| B. | too large |
| Answer» C. | |