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 inductance of a certain moving- iron ammeter is expressed as L = 10 + 3θ – \(\frac{θ^2}{4}\) μH, where θ is the deflection in radian from the zero position. The control spring torque is 25 × 10-6 Nm/rad. The meter carries a current of 5 A. What is the deflection? |
| A. | 2.4 |
| B. | 2.0 |
| C. | 1.2 |
| D. | 1.0 |
| Answer» D. 1.0 | |
| 2. |
The standardization of AC potentiometer is done by ____________ |
| A. | Using a DC standard source and d’ Arsonval galvanometer |
| B. | Using AC standard sources and transfer instruments |
| C. | Using a standard AC voltage source |
| D. | Using a DC standard source and transfer instruments |
| Answer» E. | |
| 3. |
A 10 mA PMMC ammeter reads 4 mA in a circuit. Its bottom control spring snaps suddenly. The meter will now show __________ |
| A. | 10 mA |
| B. | 8 mA |
| C. | 2 mA |
| D. | Zero |
| Answer» E. | |
| 4. |
Moving Iron Instrument can be used as ____________ |
| A. | An ammeter for measuring DC as well as AC |
| B. | For measuring DC current and voltages only |
| C. | An ammeter and a voltmeter for measuring DC as well as AC |
| D. | For measuring AC current and voltages only |
| Answer» D. For measuring AC current and voltages only | |
| 5. |
The scale of a dynamometer type instrument marked in terms of RMS value would be__________ |
| A. | Uniform throughout |
| B. | Non-uniform and crowded near the full scale |
| C. | Non-uniform and crowded at the beginning |
| D. | Non-uniform and crowded around mid-scale |
| Answer» D. Non-uniform and crowded around mid-scale | |
| 6. |
A meter has a full scale of 90° at a current of 1 A. This meter has a perfect square law response. What is the current when the deflection angle is 45°? |
| A. | 0.5 A |
| B. | 0.25 A |
| C. | 0.707 A |
| D. | 0.67 A |
| Answer» D. 0.67 A | |
| 7. |
Two ammeters, one with a full-scale current of 1 mA and internal resistance of 100 Ω and other a full-scale current of 10 mA and internal resistance of 25 Ω are in parallel. What is the total current, these two meters can carry without the reading out of scale in any meter? |
| A. | 1 mA |
| B. | 10 mA |
| C. | 11 mA |
| D. | 5 mA |
| Answer» E. | |
| 8. |
The full-scale deflection current of a meter is 4 mA and its internal resistance is 400Ω. This meter is to have full deflection when 400 V is measured. What is the value of the series resistor to be used? |
| A. | 99.90 kΩ |
| B. | 100 kΩ |
| C. | 99.60 kΩ |
| D. | 100 Ω |
| Answer» D. 100 Ω | |
| 9. |
The full-scale deflection current of an ammeter is 4 mA and its internal resistance is 400Ω. If this meter is to have a full deflection of 10 A, what is the value of the shunt resistance to be used? |
| A. | 49.99 Ω |
| B. | 0.16 Ω |
| C. | 1.5 Ω |
| D. | 2.6 Ω |
| Answer» C. 1.5 Ω | |
| 10. |
In a moving iron meter, the deflection torque is proportional to? |
| A. | Square of the current through the coil |
| B. | Current through the coil |
| C. | Sine of measurand |
| D. | The Square root of the measurand |
| Answer» B. Current through the coil | |