MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 57 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Selenium rectifier can be operated at temperatures as high as____________? |
| A. | 25°C |
| B. | 40°C |
| C. | 60°C |
| D. | 75°C |
| Answer» E. | |
| 52. |
Which of the following is the loss within the mercury arc rectifier chamber ? |
| A. | Voltage drop in arc |
| B. | Voltage drop at the anode |
| C. | Voltage drop at the cathode |
| D. | All of the above |
| Answer» E. | |
| 53. |
Which of the following rectifiers are primarily used for charging of low voltage batteries from AC supply ? |
| A. | Mechanical rectifiers |
| B. | Copper oxide rectifiers |
| C. | Selenium rectifiers |
| D. | Electrolytic rectifiers |
| E. | Mercury arc rectifiers |
| Answer» E. Mercury arc rectifiers | |
| 54. |
Which of the following rectifiers have been used extensively in supplying direct current for electroplating ? |
| A. | Copper oxide rectifiers |
| B. | Selenium rectifiers |
| C. | Mercury arc rectifiers |
| D. | Mechanical rectifiers |
| E. | None of the above |
| Answer» C. Mercury arc rectifiers | |
| 55. |
In a mercury arc rectifier, the anode is usually made of_____________? |
| A. | copper |
| B. | aluminium |
| C. | silver |
| D. | graphite |
| E. | tungsten |
| Answer» E. tungsten | |
| 56. |
The efficiency of an electrolytic rectifier is nearly____________? |
| A. | 80% |
| B. | 70% |
| C. | 60% |
| D. | 40% |
| Answer» D. 40% | |
| 57. |
The ignited or auxiliary anode in mercury arc rectifier is made of____________? |
| A. | graphite |
| B. | boron carbide |
| C. | aluminium |
| D. | copper |
| Answer» C. aluminium | |