MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Kinematics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The efficiency of the a screw jack is maximum, when |
| A. | α = 450 + ɸ/2 |
| B. | α = 450 – ɸ/2 |
| C. | α = 900 + ɸ |
| D. | α = 900 – ɸ |
| Answer» C. α = 900 + ɸ | |
| 2. |
In a screw jack, the effort required to lower the load W is given by |
| A. | P = W tan (α – ɸ) |
| B. | P = W tan (α + ɸ) |
| C. | P = W tan (ɸ – α) |
| D. | P = W cos (α + ɸ) |
| Answer» D. P = W cos (α + ɸ) | |
| 3. |
In a screw jack, the effort required to lift the load W is given by |
| A. | P = W tan (α – ɸ) |
| B. | P = W tan (α + ɸ) |
| C. | P = W tan (ɸ – α) |
| D. | P = W cos (α + ɸ) |
| Answer» C. P = W tan (ɸ – α) | |
| 4. |
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 |
| A. | P = W tanα |
| B. | P = W tan (α + ɸ) |
| C. | P = W (sinα + μ cosα) |
| D. | P = W (cosα + μ sinα) |
| Answer» D. P = W (cosα + μ sinα) | |
| 5. |
THE_LOAD_CUP_OF_A_SCREW_JACK_IS_MADE_SEPARATE_FROM_THE_HEAD_OF_THE_SPINDLE_TO?$ |
| A. | enhance the load carrying capacity of the jack |
| B. | reduce the effort needed for lifting the working load |
| C. | reduce the value of frictional torque required to be countered for lifting the load |
| D. | prevent the rotation of load being lifted |
| Answer» E. | |
| 6. |
The_efficiency_of_the_a_screw_jack_is_maximum,_when$ |
| A. | α = 45<sup>0</sup> + ɸ/2 |
| B. | α = 45<sup>0</sup> – ɸ/2 |
| C. | α = 90<sup>0</sup> + ɸ |
| D. | α = 90<sup>0</sup> – ɸ |
| Answer» C. ‚âà√≠¬¨¬± = 90<sup>0</sup> + ‚Äö√Ѭ∂‚Äö√†√® | |
| 7. |
Efficiency of a screw jack is given b? |
| A. | tan(α + ɸ)/tanα |
| B. | tanα/ tan(α + ɸ) |
| C. | tan(α – ɸ)/tanα |
| D. | tanα/tan(α – ɸ) |
| Answer» C. tan(‚âà√≠¬¨¬± ‚Äö√Ñ√∂‚àö√ë‚àö¬® ‚Äö√Ѭ∂‚Äö√†√®)/tan‚âà√≠¬¨¬± | |
| 8. |
The frictional torque for square thread at the mean radius r while raising load W is given by |
| A. | T = W.rtan(α – ɸ) |
| B. | T = W.rtan(α + ɸ) |
| C. | T = W.rtanα |
| D. | T = W.rtan…∏ |
| Answer» C. T = W.rtan‚âà√≠¬¨¬± | |
| 9. |
The coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
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$ |
| A. | P = W tanα |
| B. | P = W tan (α + ɸ) |
| C. | P = W (sinα + μ cosα) |
| D. | P = W (cosα + μ sinα) |
| Answer» D. P = W (cos‚âà√≠¬¨¬± + ‚âà√≠¬¨‚à´ sin‚âà√≠¬¨¬±) | |
| 11. |
A body will begin to move down an inclined plane, if the angle of inclination of the plane is ____________ the angle of friction. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 12. |
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‚âà√¨¬¨‚Ä¢ | |