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.
| 201. |
A spring controlled governor is found unstable. It can be made stable by |
| A. | increasing the spring stiffness |
| B. | decreasing the spring stiffness |
| C. | increasing the ball mass |
| D. | decreasing the ball mass |
| Answer» C. increasing the ball mass | |
| 202. |
In order to have a good grip on the pulley, the V-belt should touch the bottom of the groove in the pulley. |
| A. | True |
| B. | False |
| Answer» C. | |
| 203. |
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 | |
| 204. |
The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, = Load over the bearing, and = Radius of bearing surface) |
| A. | μ |
| B. | μ |
| C. | μ |
| D. | μ |
| Answer» B. μ | |
| 205. |
If the damping factor for a vibrating system is unity, then the system will be |
| A. | over damped |
| B. | under damped |
| C. | critically damped |
| D. | without vibrations |
| Answer» D. without vibrations | |
| 206. |
In vibration isolation system, if ω/ω < , then for all values of damping factor, the trans-missibility will be (where ω = Angular speed of the system, ω = Natural frequency of vibration of the system) |
| A. | less than unity |
| B. | equal to unity |
| C. | greater than unity |
| D. | zero |
| Answer» D. zero | |
| 207. |
The time taken by a particle for one complete oscillationis known as periodic time. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 208. |
In the below figure, is the connecting rod and is the crank making an angle θ with the line of stroke and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston is shown by quadrilateral , the acceleration of the piston is zero when the crank and connecting rod are at right angles to each other. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 209. |
For the brake to be self locking, the force at shown in the below figure, should |
| A. | be zero |
| B. | act in upward direction |
| C. | act in downward direction |
| D. | none of these |
| Answer» B. act in upward direction | |
| 210. |
In a four bar chain or quadric cycle chain |
| A. | each of the four pairs is a turning pair |
| B. | one is a turning pair and three are sliding pairs |
| C. | two are turning pairs and two are sliding pairs |
| D. | three are turning pairs and one is a sliding pair |
| Answer» B. one is a turning pair and three are sliding pairs | |
| 211. |
In a Proell governor, the balls are attached to the extension of lower links. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 212. |
When a mechanism is required to transmit power or to do some particular type of work, then it becomes a machine. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 213. |
The transmissibility, for all values of damping factor, will be less than unity, if ω/ω is |
| A. | equal to 1 |
| B. | less than |
| C. | equal to |
| D. | greater than |
| Answer» E. | |
| 214. |
point on a rigid link moves with respect to with angular velocity ω rad/s. The radial component of the acceleration of with respect to , is (where = Linear velocity of with respect to ) |
| A. | x |
| Answer» E. | |
| 215. |
Critical damping is a function of |
| A. | mass and stiffness |
| B. | mass and damping coefficient |
| C. | mass and natural frequency |
| D. | damping coefficient and natural frequency |
| Answer» B. mass and damping coefficient | |
| 216. |
The relation between me number of links () and the number of binary joints () for a kinematic chain having constrained motion is given by = - 2. If the left hand side of this equation is greater than the right hand side, then the chain is |
| A. | locked chain |
| B. | completely constrained chain |
| C. | successfully constrained chain |
| D. | incompletely constrained chain |
| Answer» B. completely constrained chain | |
| 217. |
The example of successfully constrained motion is a |
| A. | motion of an I.C. engine valve |
| B. | motion of the shaft between a foot-step bearing |
| C. | piston reciprocating inside an engine cylinder |
| D. | all of the above |
| Answer» E. | |
| 218. |
When the axes of the first and last wheels are co-axial, then the train is known as |
| A. | simple train of wheels |
| B. | compound train of wheels |
| C. | reverted gear train |
| D. | epicyclic gear train |
| Answer» D. epicyclic gear train | |
| 219. |
The primary unbalanced force is more than the secondary unbalanced force. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 220. |
The frictional torque transmitted in a flat pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear. |
| A. | less |
| B. | more |
| C. | same |
| Answer» C. same | |