MCQOPTIONS
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MCQOPTIONS
This section includes 11 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. |
A screw jack has square threads and the lead angle of the thread is α. The screw jack will be self locking when the coefficient of friction (μ) is |
| A. | μ > tan α |
| B. | μ = sin α |
| C. | μ = cot α |
| D. | μ = cosec α |
| Answer» B. μ = sin α | |
| 2. |
If α denotes the lead angle and φ, the angle of friction, then the efficiency of the screw is written as |
| A. | tan(α − φ)/tanα |
| B. | tanα/tan (α − φ) |
| C. | tan(α + φ)/tanα |
| D. | tanα/tan (α + φ) |
| Answer» E. | |
| 3. |
WHILE_DESIGNING_A_SCREW_IN_A_SCREW_JACK_AGAINST_BUCKLING_FAILURE,_THE_END_CONDITIONS_FOR_THE_SCREW_ARE_TAKEN_AS?$ |
| A. | both ends fixed |
| B. | both ends hinged |
| C. | one end fixed and other end hinged |
| D. | one end fixed and other end free. |
| Answer» E. | |
| 4. |
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. | |
| 5. |
A screw is said to be self locking screw, if its efficiency is |
| A. | less than 50% |
| B. | more than 50% |
| C. | equal to 50% |
| D. | none of the mentioned |
| Answer» B. more than 50% | |
| 6. |
To ensure self locking in a screw jack, it is essential that the helix angle is |
| A. | larger than friction angle |
| B. | smaller than friction angle |
| C. | equal to friction angle |
| D. | such as to give maximum efficiency in lifting |
| Answer» C. equal to friction angle | |
| 7. |
A screw jack has square threads and the lead angle of the thread is α. The screw jack will be self locking when the coefficient of friction (μ) is$ |
| A. | μ > tan α |
| B. | μ = sin α |
| C. | μ = cot α |
| D. | μ = cosec α |
| Answer» B. ‚âà√≠¬¨‚à´ = sin ‚âà√≠¬¨¬± | |
| 8. |
If α denotes the lead angle and φ, the angle of friction, then the efficiency of the screw is written as$ |
| A. | tan(α − φ)/tanα |
| B. | tanα/tan (α − φ) |
| C. | tan(α + φ)/tanα |
| D. | tanα/tan (α + φ) |
| Answer» E. | |
| 9. |
Screws used for power transmission should have |
| A. | low efficiency |
| B. | high efficiency |
| C. | very fine threads |
| D. | strong teeth |
| Answer» C. very fine threads | |
| 10. |
Multiple threads are used to secure |
| A. | low efficiency |
| B. | high efficiency |
| C. | high load lifting capacity |
| D. | high mechanical advantage |
| Answer» C. high load lifting capacity | |
| 11. |
Which of the following screw thread is adopted for power transmission in either direction? |
| A. | Acme threads |
| B. | Square threads |
| C. | Buttress threads |
| D. | Multiple threads |
| Answer» C. Buttress threads | |