MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your 8051 Microcontroller knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
PWM_ALLOWS_THE_CONTROL_OF_A_DC_MOTOR_WITH_THE_SAME_PHASE,_BUT_WITH_DIFFERENT_AMPLITUDE_PHASES??$ |
| A. | true |
| B. | false |
| C. | cant be determined |
| D. | none of the mentioned |
| Answer» C. cant be determined | |
| 2. |
How_can_the_direction_of_the_DC_motor_be_changed?$ |
| A. | by changing the torque |
| B. | by changing the switching speed |
| C. | by changing the polarity of voltages connected to the leads |
| D. | by changing the RPM rating |
| Answer» D. by changing the RPM rating | |
| 3. |
The RPM rating given for the DC motor is for? |
| A. | no-loaded |
| B. | loaded |
| C. | none of the mentioned |
| D. | all of the mentioned |
| Answer» B. loaded | |
| 4. |
Which of the following can be a unit for torque? |
| A. | kg/m<sup>2</sup> |
| B. | ounce-inch |
| C. | kg-m<sup>3</sup> |
| D. | g/m |
| Answer» C. kg-m<sup>3</sup> | |
| 5. |
How can we control the speed of a stepper motor? |
| A. | by controlling its switching rate |
| B. | by controlling its torque |
| C. | by controlling its wave drive 4 step sequence |
| D. | cant be controlled |
| Answer» B. by controlling its torque | |
| 6. |
What are optoisolators? |
| A. | it is a driver |
| B. | it is a thing isolated from the entire world |
| C. | it is a device that can be used as an electromagnetic relay without a driver |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 7. |
Why are solid relays advantageous over electromagnetic relays? |
| A. | they need zero voltage circuit |
| B. | they need less current to be energised |
| C. | they need less voltage to be energised |
| D. | none of the mentioned |
| Answer» C. they need less voltage to be energised | |
| 8. |
Why do we need a ULN2803 in driving a relay? |
| A. | for switching a motor |
| B. | for increasing the current limit in the relays |
| C. | for increasing the power |
| D. | for decreasing the current limit in the relays |
| Answer» C. for increasing the power | |
| 9. |
What are DPDT relays? |
| A. | Single pole, single throw |
| B. | Single pole, double throw |
| C. | Double pole, double throw |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 10. |
What is the principle on which electromagnetic relays operate? |
| A. | electromagnetic induction |
| B. | motor control |
| C. | switching |
| D. | none of the mentioned |
| Answer» B. motor control | |