McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 51. |
A flywheel weighs 400 kg and has a radius of gyration of 30 cm about its axis of rotation. It is mounted on a shaft subjected to a moment of 40 kgm. If the flywheel starts from restits speed after 3 seconds wil be |
| A. | 10.9 rad/sec |
| B. | 19.0 rad/sec |
| C. | 51.2 rad/sec |
| D. | 3.33 rad/sec |
| E. | 16.35 rad/sec |
| Answer» D. 3.33 rad/sec | |
| 52. |
The satellite moves in a circle around the earth. The radius of this circle is equal to one-half the radius of the moons orbit. The satellite will complete one revolution in |
| A. | 1 lunar month |
| C. | 2-3/4 lunar month |
| D. | 2-2/3 lunar month |
| E. | None of the above |
| Answer» E. None of the above | |
| 53. |
In a tug of war, five men pull a rope to the left at A and six moen pull the rope at B. A weight of 5 kg is hung vertically from the centre of the rope. In order that the rope AB be horizontal |
| A. | the force applied on A must be equal to that on B |
| B. | at least one man on side B should be removed |
| C. | infinite force will be required to be applied at both ends |
| D. | the force required on A must not be equal to that on B |
| E. | 107 dynes |
| Answer» C. infinite force will be required to be applied at both ends | |
| 54. |
For the maximum range of a projectile the angle of projection should be |
| A. | 90? |
| B. | 30? |
| C. | 22 |
| D. | 45? |
| E. | 15? |
| Answer» D. 45? | |
| 55. |
In a torsion pendulum |
| A. | The body attached to the lower end of wire or rod must be elastic |
| B. | The clamp must be elastic |
| C. | The clamp must be elastic |
| D. | (A) and (B) above |
| E. | (A), (B) and (C) together |
| Answer» C. The clamp must be elastic | |
| 56. |
A train moving at 60 kilometers per hour is struck by a bullet moving 1000 m/sec at right angles to the train. The direction with which the bullet appears to strike the train would be |
| A. | 75? |
| B. | 60? |
| C. | 22 |
| D. | 30? |
| E. | 45? |
| Answer» E. 45? | |
| 57. |
A cable is supported at A and B, in which B is higher than A. The tension in the cable will be maximum at |
| A. | A |
| B. | A and B |
| C. | C |
| D. | B |
| E. | 107 dynes |
| Answer» D. B | |
| 58. |
A column has its equivalent length equal to its length in case of |
| A. | one end fixed, other free |
| B. | both ends hinged |
| C. | one end hinged, other free |
| D. | 107 dynes |
| E. | both end fixed |
| Answer» B. both ends hinged | |
| 59. |
A particle in SHM while passing through mean position will have |
| A. | maximum kinetic energy and maximum potential energy |
| B. | 107 dynes |
| C. | maximum kinetic energy and minimum potential energy |
| D. | average kinetic energy and average potential energy. |
| E. | minimum kinetic energy and maximum potential energy |
| Answer» C. maximum kinetic energy and minimum potential energy | |
| 60. |
A jet of water of cross-sectional area 20 sq. cm impinges on a plate at an angle of 60? with a velocity of 10 m/sec. Neglecting the friction between the jet and plate (density of water 1000/9.81 kgm-1 sec2 per cubic meter), the force exerted by the jet on the plate would be in the range |
| A. | 15 - 20 kg |
| B. | 20 - 25 kg |
| C. | 5 - 10 kg |
| D. | 25 - 30 kg |
| E. | 10 - 15 kg |
| Answer» A. 15 - 20 kg | |
| 61. |
A flywheel starting from rest and accelerating uniformly performs 25 revolutions in 5 sec. Its angular velocity in rpm after 10 seconds would be |
| A. | 50 rpm |
| B. | 20 rpm |
| C. | 25 rpm |
| D. | 60 rpm |
| E. | 45 rpm |
| Answer» B. 20 rpm | |
| 62. |
The dimensions of gravitational constant G |
| A. | MLT-2 |
| B. | M-1L3T-2 |
| C. | Ellipsc |
| D. | ML2T-1 |
| E. | MLT-1 |
| Answer» B. M-1L3T-2 | |
| 63. |
The coefficient of friction is |
| A. | The tangent of the angle between the normal reaction and direction of limiting friction |
| B. | The tangent of the angle between the normal reaction and the resultant of the normal reaction and the limiting friction |
| C. | The tangent of the angle of the net resultant force with the direction of motion |
| D. | The tangent of the angle between the horizontal plane and the resultant force |
| E. | The angle between the normal reaction and the resultant of normal reaction and the limiting friction |
| Answer» A. The tangent of the angle between the normal reaction and direction of limiting friction | |
| 64. |
The maximum frictional force which comes into play when a body just begins to slide over the surface of another body is known as |
| A. | Kinetic friction |
| B. | Rolling friction |
| C. | Dynamic friction |
| D. | Limiting friction |
| E. | Sliding friction |
| Answer» D. Limiting friction | |
| 65. |
In planetary motion |
| A. | The total angular momentum remains constant |
| B. | The total linear momentum remains constant |
| C. | The total linear momentum is zero |
| D. | The total angular momentum is zero |
| E. | None of the above |
| Answer» A. The total angular momentum remains constant | |
| 66. |
The moment of inertia of a semi-circle of radius r with respect to a centroidal axis parallel to the diameter is |
| A. | 0.33 r2 |
| B. | 0.11 r2 |
| C. | 0.055 r2 |
| D. | 0.05 r2 |
| E. | 0.22 r2 |
| Answer» B. 0.11 r2 | |
| 67. |
A satellite orbits the earth 200 km above the surface. What speed, in m/s, is necessary for a circular orbit? The radius of the earth is 6400 km and g = 9.2 m/s2 |
| A. | 7200 |
| B. | 6600 |
| C. | 7800 |
| D. | 6000 |
| E. | 107 dynes |
| Answer» C. 7800 | |
| 68. |
The curve of a catenary by nature is |
| A. | hyperbolic |
| B. | ellipse |
| C. | 107 dynes |
| D. | circular |
| E. | parabolic |
| Answer» E. parabolic | |
| 69. |
The power of a locomotive is 315 kW and the total weight of the train is 2000 kN. If the track resistance is qN per kN, the maximum speed that the locomotive can attain on level track will be |
| A. | 103 kmph |
| B. | 83 kmph |
| C. | 107 dynes |
| D. | 43 kmph |
| E. | 63 kmph |
| Answer» E. 63 kmph | |
| 70. |
If for power transmission a gear train consisting of 11 gears is used, then |
| A. | the motion of driver and follower will be in the same direction |
| B. | The motion of driver and follower will be in the opposite direction |
| C. | either of (A) or (B) above |
| D. | None of the above |
| E. | 107 dynes |
| Answer» A. the motion of driver and follower will be in the same direction | |
| 71. |
A body weighing one tonne falls through 8 cm on to a spring of stiffness 500 kg/cm the spring will be compressed through |
| A. | 8 cm |
| B. | 6 cm |
| C. | 4 cm |
| D. | 10 cm |
| E. | 12 cm |
| Answer» A. 8 cm | |
| 72. |
What is the total acceleration of a point on the rim of a flywheel 4 mts in diameter 0.6 see after it has started from rest if it accelarates uniformly from rest to 2000 rpm in 20 secs. |
| A. | 68.9 mts/sec2 |
| B. | 102.6 mts/sec2 |
| C. | 78.94 mts/sec2 |
| D. | 107 dynes |
| E. | 33.2 mts/sec2 |
| Answer» C. 78.94 mts/sec2 | |
| 73. |
Two identical weights are dropped simultaneously, one on water and the other in glycerine. Which of the following statement is correct? |
| A. | The weight will settle slowly in water but quickly in glycerine |
| B. | The weights will take same time to settle |
| C. | The water level will fall but glycerine level will rise |
| D. | The weight will settle quickly in water but slowly in glycerine |
| E. | 107 dynes |
| Answer» D. The weight will settle quickly in water but slowly in glycerine | |
| 74. |
A wound watch spring possesses energy in the form of |
| A. | Mechanical potential energy |
| B. | Kinetic energy |
| C. | Spring energy |
| D. | Potential energy |
| E. | Both potential and kinetic energy |
| Answer» A. Mechanical potential energy | |
| 75. |
The earth's gravitational force field is said to be conservative force field because |
| A. | The work acted by the earth's gravitational field on a particle is independent on the path traced out by the particle |
| B. | The work acted by the erth's gravitational field will cause same path for all particles irrespective of their mass |
| C. | The direction of gravitational force is fixed |
| D. | The gravitational field has only single directional component always acting normal to a body |
| E. | The value of gravitational force rise is fixed |
| Answer» A. The work acted by the earth's gravitational field on a particle is independent on the path traced out by the particle | |
| 76. |
A body is vibrating with simple harmonic motion of aplitude 5 cm frequency 10 vibrations per second. The maximum value of velocity in cm/s will be |
| A. | 3.14 cm/s |
| B. | 314 cm/s |
| C. | 3140 cm/s |
| D. | 31.4 cm/s |
| E. | 31400 cm/s |
| Answer» B. 314 cm/s | |
| 77. |
The statement that the sum of the kinetic and potential energies of a particle in the earth's gravitational field is constant is known as |
| A. | Principle of conservation of mechanical energy |
| B. | Law of gravitation |
| C. | Newton's law |
| D. | Principle of conservation of momentum |
| E. | Law of nature |
| Answer» A. Principle of conservation of mechanical energy | |
| 78. |
Which of the following is an example of a projectile? |
| A. | Launching of a satellite |
| B. | Taking off of an aircraft |
| C. | Lifting of a balloon |
| D. | Throwing of a cricket ball by a player |
| E. | None of the above |
| Answer» D. Throwing of a cricket ball by a player | |
| 79. |
A grinding wheel is rotating at 3000 rpm. When the switch is turned off the wheel stops in 10 seconds. The uniform deceleration of the wheel was |
| A. | 1 rad/s2 |
| B. | 31.4 rad/s2 |
| C. | 4 rad/s2 |
| D. | 62.8 rad/s2 |
| E. | 10.4 rad/s2 |
| Answer» B. 31.4 rad/s2 | |
| 80. |
The time required to stop a car moving with a velocity 20 m/sec within a distance of 40 m is equal to |
| A. | 8 sec |
| B. | 2 sec |
| C. | 4 sec |
| D. | 10 sec |
| E. | 6 sec |
| Answer» C. 4 sec | |
| 81. |
If span is 150 mts and sag is 10 ft of a cable carrying a load of 3200 kg per horizontal metre then tension of ends is |
| A. | 104,000 kg |
| B. | 107 dynes |
| C. | 1200,000 kg |
| D. | 932,000 kg |
| E. | 584,000 kg |
| Answer» D. 932,000 kg | |
| 82. |
A cube of wood supporting 200 gm mass just floats in water. When the mass is removed, the cube rises by 2 cm the side of the cube will be |
| A. | 5 cm |
| B. | 10 cm |
| C. | 12.5 cm |
| D. | 20 cm |
| E. | 15 cm |
| Answer» A. 5 cm | |
| 83. |
The principle of conservation of energy cannot be applied in case of |
| A. | Flow of water in a pipe |
| B. | A particle moving in gravitational field |
| C. | Frictional movement of a particle over a surface |
| D. | Frictionless movement of a principle over a surface |
| E. | Simple pendulum |
| Answer» C. Frictional movement of a particle over a surface | |
| 84. |
A ball weighing 250 gm is thrown vertically upwards with a velocity of 980 cm/sec. The time that the ball will take to return back to earth would be |
| A. | 1 sec |
| B. | 4 sec |
| C. | 2 sec |
| D. | 5 sec |
| E. | 3 sec |
| Answer» C. 2 sec | |
| 85. |
In above problem the resultant reaction between the cannon and the ground would be |
| A. | 1146 tonnes |
| B. | 573 tonnes |
| C. | 286.5 tonnes |
| D. | 50 tonnes |
| E. | 145 tonnes |
| Answer» B. 573 tonnes | |
| 86. |
ML2T-2 could be the dimension of all of the following EXCEPT |
| A. | Energy |
| B. | Work |
| C. | 107 dynes |
| D. | Power |
| E. | Torque |
| Answer» D. Power | |
| 87. |
Femtometre x Nanometer x (Gigametre)2 = |
| A. | Micrometre |
| B. | Metre |
| C. | Picometre |
| D. | 107 dynes |
| E. | Megametre |
| Answer» A. Micrometre | |
| 88. |
When horizontal range of a projectile equal to the distance through which projectile will rise, then the angle of projection of the particle will be equal to |
| A. | 36? |
| B. | 24? |
| C. | 48? |
| D. | 107 dynes |
| E. | 76? |
| Answer» E. 76? | |
| 89. |
The excape velocity on the surface of the earth is |
| A. | 11.2 km/s |
| B. | 2.2 km/s |
| C. | 5.6 km/s |
| D. | 4.4 km/s |
| E. | 1 km/s |
| Answer» E. 1 km/s | |
| 90. |
The centre of percussions is |
| A. | The point of application of the resultant of all the forces tending to cause a body to rotate about a central axis |
| B. | The point of application of the resultant of gravity and buoyancy forces of the body |
| C. | The same as centre of gravity |
| D. | The metacentre of the body |
| E. | The point in a body about which it can rotate horizontally and oscillates under the influence of gravity |
| Answer» A. The point of application of the resultant of all the forces tending to cause a body to rotate about a central axis | |
| 91. |
Plastic collosion of two bodies of equal mass results in a common velocity after impact which is |
| A. | Sum of their initial velocities |
| B. | Difference of their initial velocities |
| C. | Average of their initial velocities |
| D. | Independent of their initial velocities |
| E. | None of the above |
| Answer» E. None of the above | |
| 92. |
In which case power required would be more |
| A. | In lifting up a weight of 100 kg at a velocity of 3 m/sec but accelerating upwards at 0.5 m/sec |
| B. | In lowering a weight of 100 kg along an a inclined plane at an angle of 45? with |
| C. | In lifting up a weight of 100 kg at a constant speed of 3 m/sec |
| D. | In lowering the weight at a constant speed of 3 m/sec |
| E. | In lowering the weight at a velocity of 3 m/sec and acceleration of 1 m/sec2 |
| Answer» A. In lifting up a weight of 100 kg at a velocity of 3 m/sec but accelerating upwards at 0.5 m/sec | |
| 93. |
In case forces of 1 N, 2 N, 3 N, 4 N, 5 N and 6 N act in order along the sides of a regular hexagon, the resultant will be |
| A. | 21 N |
| B. | 107 dynes |
| C. | 2 N |
| D. | 6 N |
| E. | 0 |
| Answer» D. 6 N | |
| 94. |
A boy and his dad put a rope around a tree and stand side by side. What force by the boy can resist a force of 800 N by the dad? |
| A. | 231 |
| B. | 246 |
| C. | 192 |
| D. | 107 dynes |
| E. | 166 |
| Answer» E. 166 | |
| 95. |
The necessary condition of equilibrium of a body is |
| A. | The algebraic sum of horizontal components of all forces must be zero |
| B. | The algebraic sum of vertical components of all forces must be zero |
| C. | The algebraic sum of forces about a point must be zero |
| D. | All the above |
| E. | None of the above |
| Answer» D. All the above | |
| 96. |
The displacement of a particle under going rectilinear motion along the x-axis is given by x = 2t3 + 21t2 + 60t + 6 metres. |
| A. | 27 m/s2 |
| B. | 18 m/s2 |
| C. | 36 m/s2 |
| D. | 9 m/s2 |
| E. | 107 dynes |
| Answer» D. 9 m/s2 | |
| 97. |
A couple consists of a force P acting at a point A whose coordinates are (-1,2,4) m and force - F acting at a point whose coordinates are (2,3, -2)m. If F = 3i + 2j - 4k in kg units the moment of the couple in kg - m units would be |
| A. | 8i - 6j - 3k |
| B. | 12i - 3j + k |
| C. | 16i - 12j - 6k |
| D. | 4i - 3j + k |
| E. | 8i + 5j + 3k |
| Answer» A. 8i - 6j - 3k | |
| 98. |
A block slides down a smooth inclined plane when released from the top while another falls freely from the same point. The value of which parameter in the two cases will be identical? |
| A. | Time taken to reach the ground |
| B. | Kinetic energy at the ground |
| C. | Momentum at the ground |
| D. | Velocity while touching the ground |
| E. | Kinetic energy after one second |
| Answer» D. Velocity while touching the ground | |
| 99. |
The sag in a tape 100 ft long held between two supports 99.8 ft aprat at the same level is |
| A. | 3.32 ft |
| B. | 0.98 ft |
| C. | 2.73 ft |
| D. | 1.87 ft |
| E. | 107 dynes |
| Answer» C. 2.73 ft | |
| 100. |
A piece of wetted wood just floats in water. When placed in an oil of specific gravity 0.75, it will |
| A. | Float with upside down |
| B. | Sink |
| C. | Float for sometime and then sink |
| D. | Float with 3/4 of volume above the liquid surface |
| E. | Float with 1/4 of volume above the liquid level |
| Answer» B. Sink | |
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