MCQOPTIONS
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MCQOPTIONS
This section includes 61 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Two pipes of diameters d1 and d2 converge to form a pipe of diameter 2d. If the liquid flows with a velocity of v1 and v2 in the two pipes, what will be the flow velocity in the third pipe? |
| A. | v1 + v2 |
| B. | v1 + v2/2 |
| C. | v1 + v2/4 |
| D. | 2(v1 + v2) |
| Answer» D. 2(v1 + v2) | |
| 52. |
Compute the conductivity when the current density is 12 units and the electric field is 20 units. Also identify the nature of the material. |
| A. | 1.67, dielectric |
| B. | 1.67, conductor |
| C. | 0.6, dielectric |
| D. | 0.6, conductor |
| Answer» D. 0.6, conductor | |
| 53. |
For an incompressible flow, the mass continuity equation changes to ________ |
| A. | energy equation |
| B. | momentum equation |
| C. | volume continuity equation |
| D. | remains same |
| Answer» D. remains same | |
| 54. |
The current entering the volume at x is I and leaving is I+Δi , the number of coulombs per second will be equal to δI. Is it true or false?$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 55. |
Calculate the charge density for the current density given 20sin x i + ycos z j at the origin. |
| A. | 20t |
| B. | 21t |
| C. | 19t |
| D. | -20t |
| Answer» C. 19t | |
| 56. |
In electromagnetic theory, continuity equation relates _______ |
| A. | Volume conservation |
| B. | Mass conservation |
| C. | Charge conservation |
| D. | Energy conservation |
| Answer» D. Energy conservation | |
| 57. |
Calculate the number of coulombs per second if the area is 4cm2, recombination rate of hole is 1000 cm-3/s and the differential length is 2mm. |
| A. | 1.28*10<sup>-23</sup> |
| B. | 1.28*10<sup>-22</sup> |
| C. | 1.28*10<sup>-21</sup> |
| D. | 1.28*10<sup>-20</sup> |
| Answer» C. 1.28*10<sup>-21</sup> | |
| 58. |
The continuity equation is based on the principle of |
| A. | conservation of mass |
| B. | conservation of momentum |
| C. | conservation of energy |
| D. | conservation of force |
| Answer» B. conservation of momentum | |
| 59. |
The continuity equation is a combination of which of the two laws? |
| A. | Ohm’s law and Gauss law |
| B. | Ampere law and Gauss law |
| C. | Ohm’s law and Ampere law |
| D. | Maxwell law and Ampere law |
| Answer» C. Ohm‚Äö√Ñ√∂‚àö√ë‚àö¬•s law and Ampere law | |
| 60. |
The quantity specifying the flow or motion is termed as _________ |
| A. | Density |
| B. | Flux |
| C. | Field |
| D. | Electrostatic force |
| Answer» C. Field | |
| 61. |
What does p/τ represent? |
| A. | holes |
| B. | time |
| C. | holes per second lost |
| D. | p per unit time |
| Answer» D. p per unit time | |