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This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
1. |
An ammeter requires a change of 3 A in its coil to produce a change in deflection of the pointer by 12 mm. Its sensitivity is |
A. | 15 mm/A |
B. | 9 mm/A |
C. | 4 mm/A |
D. | 36 mm/A |
Answer» D. 36 mm/A | |
2. |
An instrument has sensitivity of 1000 ohm/volt. On the 100 volt scale, this instrument will have internal resistance of: |
A. | 10 ohms |
B. | 10,000 ohms |
C. | 100,000 ohms |
D. | 1000 ohms |
Answer» D. 1000 ohms | |
3. |
Consider the following statements regarding precision in measurements of a quantity:1. Precision is the measure of the spread of the incident errors.2. Precision is independent of the realizable correctness of the measurement.3. Precision is usually described in terms of number of digits used in the measurement by a digital instrument.Which of the above statements are correct? |
A. | 1, 2 and 3 |
B. | 1 and 2 only |
C. | 1 and 3 only |
D. | 2 and 3 only |
Answer» B. 1 and 2 only | |
4. |
If meter A requires 100 mA to give full-scale deflection, meter B requires 50 mA to give scale deflection and meter C requires 80 mA to give full-scale deflection, then the |
A. | Meter A is more sensitive |
B. | All meter are equally sensitive |
C. | Meter B is more sensitive |
D. | Meter C is more sensitive |
Answer» D. Meter C is more sensitive | |
5. |
Full scale deflection current of a D’Arsonval movement is 10 mA and internal resistance is 100 Ω. If it is converted to a multirange voltmeter, the value of multiplier required for voltage of 0-50 V is: |
A. | 5.9 kΩ |
B. | 4.1 kΩ |
C. | 5.1 kΩ |
D. | 4.9 kΩ |
Answer» E. | |
6. |
During the measurement of voltage, the voltmeter responded with a 0.18-V change when the input was varied by 0.2 V. Find the sensitivity of the instrument. |
A. | 0.9 |
B. | 0.18 |
C. | 0.1 |
D. | 0.2 |
Answer» B. 0.18 | |
7. |
A LVDT produces an RMS output voltage of 2.6 V for displacement of 0.4 μm. Calculate the sensitivity of LVDT. |
A. | 6.5 V / μm |
B. | 4.5 V / μm |
C. | 8.5 V / μm |
D. | 12.5 V / μm |
Answer» B. 4.5 V / μm | |
8. |
Find the total resistance of a voltmeter if the range of voltmeter is 50 V and sensitivity is 20 kΩ/V. |
A. | 10 kΩ |
B. | 1 MΩ |
C. | 0.4 kΩ |
D. | 2.5 kΩ |
Answer» C. 0.4 kΩ | |
9. |
Find the vertical and horizontal resolutions, respectively, used in a TV system in USA where NT = 525, NL = 42 |
A. | 365, 847 |
B. | 338, 451 |
C. | 409, 546 |
D. | 245, 547 |
Answer» C. 409, 546 | |
10. |
Precision is compose of two characteristics, one is the number of significant figures to which a measurement may be made, the other is |
A. | Conformity |
B. | Meter error |
C. | Inertia Effects |
D. | Noise |
Answer» B. Meter error | |
11. |
If Vref is the output reference value and Vfs is the ideal full-scale output voltage when the digital inputs are all 1. Which of the following equation is correct? |
A. | \(V_{ref}=V_{fs}\left(1-\dfrac{1}{2^n}\right)\) |
B. | \(V_{fs}=V_{ref}\left(\dfrac{1}{2^n}-1\right)\) |
C. | \(V_{fs}=V_{ref}\left(1-\dfrac{1}{2^n}\right)\) |
D. | \(V_{ref}=V_{fs}\left(\dfrac{1}{2^n}-1\right)\) |
Answer» D. \(V_{ref}=V_{fs}\left(\dfrac{1}{2^n}-1\right)\) | |
12. |
An instrument is used to measure a quantity at different time instances, and the expected values of the quantity are to be the same; however, the measured values are different. A set of 5 measurements that were recorded at different time instances are 98, 101, 99, 100 and 102. Find the precision of the third measurement. |
A. | 0.95 |
B. | 0.1 |
C. | 0.99 |
D. | 0.9 |
Answer» D. 0.9 | |
13. |
In the measuring instruments, the degree of conformity and closeness to the true value is known as: |
A. | Precision |
B. | Deflecting torque |
C. | Measuring scale |
D. | Accuracy |
Answer» E. | |
14. |
A digital voltmeter has a read out range from 0 to 9999 counts. If the full scale reading is 9.999 V, the resolution is: |
A. | 1 V |
B. | 0.01 V |
C. | 1 milli V |
D. | 1 micro V |
Answer» D. 1 micro V | |