MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Measurements knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Errors in a C.T. can be minimised by _________ |
| A. | making use of laminations |
| B. | having low reactance |
| C. | increasing the secondary winding turns |
| D. | decreasing the primary winding turns |
| Answer» C. increasing the secondary winding turns | |
| 2. |
In power measurements 180° phase shift is required. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
Phase angle error is given by ____________ |
| A. | \(\frac{180}{π} [\frac{1}{nI_s}]\) degrees |
| B. | \(\frac{180}{π} [\frac{I_m}{I_s}]\) degrees |
| C. | \(\frac{180}{π} [\frac{I_m}{n}]\)degrees |
| D. | \(\frac{180}{π} [\frac{I_m}{nI_s}]\) degrees |
| Answer» E. | |
| 4. |
Phase angle in a C.T. is defined as ____________ |
| A. | \(\frac{180}{π} [\frac{I_m cosδ}{nI_s}]\) degrees |
| B. | \(\frac{180}{π} [\frac{I_c sinδ}{nI_s}]\) degrees |
| C. | \(\frac{180}{π} [\frac{I_m cosδ – I_c sinδ}{nI_s}]\) degrees |
| D. | \(\frac{180}{π} [\frac{I_m sinδ – I_c cosδ}{nI_s}]\) degrees |
| Answer» D. \(\frac{180}{π} [\frac{I_m sinδ – I_c cosδ}{nI_s}]\) degrees | |
| 5. |
Ratio error is defined as ___________ |
| A. | Ratio error = Kn⁄R |
| B. | Ratio error = Kn – R⁄R |
| C. | Ratio error = Kn – R |
| D. | Ratio error = 1⁄R |
| Answer» C. Ratio error = Kn – R | |
| 6. |
Errors in a C.T. can be minimised by ________? |
| A. | making use of laminations |
| B. | having low reactance |
| C. | increasing the secondary winding turns |
| D. | decreasing the primary winding turns |
| Answer» C. increasing the secondary winding turns | |
| 7. |
In power measurements 180° phase shift is required.$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
Phase angle error is due to _________ |
| A. | C.T. |
| B. | magnetising component |
| C. | iron loss |
| D. | supply voltage |
| Answer» C. iron loss | |
| 9. |
Ratio error is due to _________ |
| A. | iron loss |
| B. | C.T. |
| C. | magnetising component |
| D. | supply voltage |
| Answer» B. C.T. | |
| 10. |
Ratio error is defined as |
| A. | Ratio error = <sup>K<sub>n</sub></sup>‚ÅÑ<sub>R</sub> |
| B. | Ratio error = <sup>K<sub>n</sub> – R</sup>⁄<sub>R</sub> |
| C. | Ratio error = K<sub>n</sub> – R |
| D. | Ratio error = <sup>1</sup>‚ÅÑ<sub>R</sub> |
| Answer» C. Ratio error = K<sub>n</sub> ‚Äö√Ñ√∂‚àö√ë‚àö¬® R | |
| 11. |
Errors are introduced in Current Transformers. |
| A. | True |
| B. | False |
| Answer» B. False | |