MCQOPTIONS
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MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Electric Drives Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which motor is preferred for overhead traveling cranes? |
| A. | Intermittent periodic motor |
| B. | Continuous duty motor |
| C. | Slow speed duty motor |
| D. | Short time rated motor |
| Answer» B. Continuous duty motor | |
| 2. |
The direction of the single-phase IM can be reversed by using which one of the method? |
| A. | By interchanging the supply terminals |
| B. | By removing the capacitor |
| C. | By changing the direction of auxiliary winding current |
| D. | By removing the main winding |
| Answer» B. By removing the capacitor | |
| 3. |
Calculate the value of the angular acceleration of the machine using the given data: J = .541 kg-m2, load torque = 10 N-m, motor torque = 2 N-m. |
| A. | 45 rad/s2 |
| B. | The machine will fail to start |
| C. | 30 rad/s2 |
| D. | 51 rad/s2 |
| Answer» C. 30 rad/s2 | |
| 4. |
Calculate the value of the angular acceleration of the Heavy duty crane using the given data: J = 5 kg-m2, load torque = 30 N-m, motor torque = 80 N-m. |
| A. | 10 rad/s2 |
| B. | 20 rad/s2 |
| C. | 30 rad/s2 |
| D. | 50 rad/s2 |
| Answer» B. 20 rad/s2 | |
| 5. |
Calculate the resonant frequency if the values of the capacitor and inductor are 4 F and 4 H. |
| A. | .25 rad/sec |
| B. | .26 rad/sec |
| C. | .28 rad/sec |
| D. | .29 rad/sec |
| Answer» B. .26 rad/sec | |
| 6. |
Calculate the frequency of the rotor side of the IM if the value of slip is 0.34 and the supply frequency is 70 Hz. |
| A. | 23.8 Hz |
| B. | 22.7 Hz |
| C. | 24.5 Hz |
| D. | 23.1 Hz |
| Answer» B. 22.7 Hz | |
| 7. |
The capacity of the Crane is expressed in terms of tonnes. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
Induction motor is also known as __________ |
| A. | Frequency changer |
| B. | Frequency remover |
| C. | Time period remover |
| D. | DC machine |
| Answer» B. Frequency remover | |
| 9. |
Which starting method is the worst method in Induction motor? |
| A. | Direct online starting |
| B. | Autotransformer starting |
| C. | Reactance starting |
| D. | Star-Delta starting |
| Answer» D. Star-Delta starting | |
| 10. |
A high starting torque is offered by the Belt Conveyors. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
Which motor is preferred for Jaw crushers? |
| A. | WRIM |
| B. | SCIM |
| C. | Belt slip ring IM |
| D. | DC shunt motor |
| Answer» D. DC shunt motor | |