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. |
The simultaneous applications of signals x (t) and y (t) to the horizontal and vertical plates respectively, of an oscilloscope, produce a vertical figure of 8 displays. If P and Q are constants and x(t) = P sin (4t + 30), then y(t) is equal to _________ |
| A. | Q sin (4t -30) |
| B. | Q sin (2t +15) |
| C. | Q sin (8t +60) |
| D. | Q sin (4t +30) |
| Answer» C. Q sin (8t +60) | |
| 2. |
A slide wire potentiometer has 10 wires of 2 m each. With the help of a standard voltage source of 1.045 V, it is standardized by keeping the jockey at 104.5 cm. If the resistance of potentiometer wires is 2000 , then the value of working current is? |
| A. | 1 mA |
| B. | 10 mA |
| C. | 0.1 mA |
| D. | 0.5 mA |
| Answer» C. 0.1 mA | |
| 3. |
A galvanometer with a full-scale current of 10 mA has a resistance of 1000 . The multiplying power of a 100 shunt with this galvanometer is? |
| A. | 110 |
| B. | 100 |
| C. | 11 |
| D. | 10 |
| Answer» D. 10 | |
| 4. |
Resistance is measured by the voltmeter-ammeter method employing DC excitation and a voltmeter is connected directly across the unknown resistance. If the voltmeter and ammeter readings are subject to maximum possible errors of 2.4 % and 1% respectively, then the magnitude of the maximum possible percentage error in the value of resistance deduced from the measurement is? |
| A. | 1.4 % |
| B. | 1.7 % |
| C. | 2.4 % |
| D. | 3.4 % |
| Answer» E. | |
| 5. |
A 100 A ammeter has an internal resistance of 100 . The range is to be extended to 500 A. The shunt required is of resistance __________ |
| A. | 20.0 |
| B. | 22.22 |
| C. | 25.0 |
| D. | 50.0 |
| Answer» D. 50.0 | |
| 6. |
A DC ammeter has a resistance of 0.1 and its current range is 0-100 A. If the range is to be extended to 0-500 A, the meter requires which of the following shunt resistance? |
| A. | 0.010 |
| B. | 0.011 |
| C. | 0.025 |
| D. | 1.0 |
| Answer» D. 1.0 | |
| 7. |
A DC ammeter is rated for 15 A, 250 V. The meter constant is 14.4 A-s/rev. The meter constant at rated voltage may be expressed as __________ |
| A. | 3750 rev/kW-h |
| B. | 3600 rev/kW-h |
| C. | 1000 rev/kW-h |
| D. | 960 rev/kW-h |
| Answer» D. 960 rev/kW-h | |
| 8. |
A 35 V DC supply is connected across a resistance in series with an unknown resistance R. a voltmeter having a resistance of 1.2 k is connected across 600 resistance and reads 5 V. The value of the known resistance is 600 . The value of resistance R will be? |
| A. | 120 |
| B. | 400 |
| C. | 1.8 k |
| D. | 2.4 k |
| Answer» E. | |
| 9. |
A setup is used to measure resistance R. The ammeter and voltmeter resistance are 0.01 and 2000 respectively. Their readings are 2 A and 180 V respectively, giving a measured resistance of 90 . The percentage error in the measurement is? |
| A. | 2.25 % |
| B. | 2.35 % |
| C. | 4.5 % |
| D. | 4.71 % |
| Answer» E. | |
| 10. |
Ra and Rd are the opposite arms of a Wheatstone bridge as are Rc and Rb. The source voltage is applied across Ra and Rc. Then when the bridge is balanced which one of the following is true? |
| A. | R<sub>a</sub> = R<sub>c</sub> R<sub>d</sub>/R<sub>b</sub> |
| B. | R<sub>a</sub> = R<sub>b</sub> R<sub>c</sub>/R<sub>d</sub> |
| C. | R<sub>a</sub> = R<sub>b</sub> Rd/R<sub>c</sub> |
| D. | R<sub>a</sub> = R<sub>b</sub> + R<sub>c</sub> + R<sub>d</sub> |
| Answer» C. R<sub>a</sub> = R<sub>b</sub> Rd/R<sub>c</sub> | |