MCQOPTIONS
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MCQOPTIONS
This section includes 56 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is ___________Vs? |
| A. | 50 |
| B. | 20 |
| C. | 0.05 |
| D. | 500 |
| Answer» C. 0.05 | |
| 52. |
Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it? |
| A. | Lowers their power efficiency |
| B. | Increases their cost of manufacture |
| C. | Leads to their increased weight |
| D. | Produces fringing |
| Answer» B. Increases their cost of manufacture | |
| 53. |
A ferrite core has less eddy current loss than an iron core because |
| A. | Ferrites have high resistance |
| B. | Ferrites are magnetic |
| C. | Ferrites have low permeability |
| D. | Ferrites have high hysteresis |
| Answer» E. | |
| 54. |
When both the inductance and resistance of a coil are doubled the value of |
| A. | Time constant remains unchanged |
| B. | Initial rate of rise of current is doubled |
| C. | Final steady current is doubled |
| D. | Time constant is halved |
| Answer» B. Initial rate of rise of current is doubled | |
| 55. |
Those magnetic materials are best suited for making armature and transformer cores which have ________permeability and _________hysteresis loss. |
| A. | High, high |
| B. | Low, high |
| C. | High, low |
| D. | Low, low |
| Answer» D. Low, low | |
| 56. |
While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit? |
| A. | E.M.F. |
| B. | Current |
| C. | Current density |
| D. | Conductivity |
| Answer» C. Current density | |