MCQOPTIONS
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MCQOPTIONS
This section includes 10 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. |
A 500 A, 50 Hz current transformer has a bar primary. The secondary burden is a pure resistance of 1 and it draws a current of 5 A. If the magnetic core requires 250 Ampere-turn for magnetization, the percentage ratio error is __________ |
| A. | 10.56% |
| B. | -10.56% |
| C. | 11.80% |
| D. | -11.80% |
| Answer» C. 11.80% | |
| 2. |
A voltmeter has a sensitivity of 1000 /V reads 200 V on its 300 V scale. When connected across an unknown resistor in series with a millimeter. When the milliammeter reads 10 mA. The error due to the loading effect of the voltmeter is ________ |
| A. | 3.33% |
| B. | 6.67% |
| C. | 13.34% |
| D. | 13.67% |
| Answer» C. 13.34% | |
| 3. |
A voltmeter has a sensitivity of 1000 /V reads 200 V on its 300 V scale. When connected across an unknown resistor in series with a millimeter. When the milliammeter reads 10 mA. The actual resistance of the unknown resistor will be? |
| A. | 20 k |
| B. | 18.57 k |
| C. | 21.43 k |
| D. | 22.76 k |
| Answer» D. 22.76 k | |
| 4. |
A voltmeter has a sensitivity of 1000 /V reads 200 V on its 300 V scale. When connected across an unknown resistor in series with a millimeter. When the milliammeter reads 10 mA. The apparent resistance of the unknown resistor will be? |
| A. | 20 k |
| B. | 21.43 k |
| C. | 18.57 k |
| D. | 22.36 k |
| Answer» B. 21.43 k | |
| 5. |
Resistances R1 and R2 have respectively, nominal values of 10 and 5 and limiting error of 5% and 10%. The percentage limiting error for the series combination of R1 and R2 is? |
| A. | 6.67% |
| B. | 5.5% |
| C. | 7.77% |
| D. | 2.8% |
| Answer» B. 5.5% | |
| 6. |
Two resistances 100 5 and 150 15 are connected in series. If the error is specified as standard deviations, the resultant error will be _________ |
| A. | 10 |
| B. | 10.6 |
| C. | 15.8 |
| D. | 20 |
| Answer» D. 20 | |
| 7. |
A resistor of 10 k with the tolerance of 5% is connected in series with 5 k resistors of 10% tolerance. What is the tolerance limit for a series network? |
| A. | 9% |
| B. | 12.04% |
| C. | 8.67% |
| D. | 6.67% |
| Answer» E. | |
| 8. |
The current flowing in a resistor of 1 is measured to be 25 A. But it was discovered that ammeter reading was low by 1% and resistance was marked high by 0.5%. Find true power as a percentage of the original power. |
| A. | 95% |
| B. | 101.5% |
| C. | 100.1% |
| D. | 102.4% |
| Answer» C. 100.1% | |
| 9. |
A 0-400V voltmeter has a guaranteed accuracy of 1% of full scale reading. The voltage measured by this instrument is 250 V. Calculate the limiting error in percentage. |
| A. | 4% |
| B. | 2% |
| C. | 2.5% |
| D. | 1% |
| Answer» B. 2% | |
| 10. |
A resistor of 10 k with the tolerance of 5% is connected in parallel with 5 k resistors of 10% tolerance. What is the tolerance limit for a parallel network? |
| A. | 9% |
| B. | 12.4% |
| C. | 8.33% |
| D. | 7.87% |
| Answer» D. 7.87% | |