MCQOPTIONS
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MCQOPTIONS
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. |
A simple slide wire potentiometer is used for measurement of current in a circuit. The voltage drop across a standard resistor of 0.1 Ω is balanced at 75 cm. Find the magnitude of current if the standard cell emf 1.45 volt is balanced at 50 cm. |
| A. | 40 A |
| B. | 35 A |
| C. | 15.5 A |
| D. | 21.75 A |
| Answer» E. | |
| 2. |
DC potentiometer is a/an ________ type instrument. |
| A. | deflection |
| B. | 'null' |
| C. | graduated |
| D. | auxiliary |
| Answer» C. graduated | |
| 3. |
How many turns of wire are needed to provide a potentiometer with a resolution of 0.05%? |
| A. | 500 |
| B. | 5000 |
| C. | 200 |
| D. | 2000 |
| Answer» E. | |
| 4. |
Potentiometer sensitivity can be increased by |
| A. | Increasing the current in potentiometer wire |
| B. | Increasing the length of potentiometer wire |
| C. | Decreasing the length of potentiometer wire |
| D. | Replacing the standard cell by a regulated power supply |
| Answer» C. Decreasing the length of potentiometer wire | |
| 5. |
Current in a circuit is measured using a simple slide wire. What will be the Voltage drop per unit lengthif the standard cell is of emf 2.38 V balanced at length of 35 cm ? |
| A. | 0.68 V/cm |
| B. | 0.068 V/cm |
| C. | 68 V/cm |
| D. | 6.8 V/cm |
| Answer» C. 68 V/cm | |
| 6. |
High value pot resistance leads to _____. |
| A. | low sensitivity |
| B. | high sensitivity |
| C. | low non-linearity |
| D. | less error |
| Answer» C. low non-linearity | |
| 7. |
_______ can be used to output a resistance which would be a function of the voltage applied to it. |
| A. | Passive resistors |
| B. | Capacitors |
| C. | Trimmer |
| D. | Potentiometers |
| Answer» E. | |
| 8. |
A 3-turn 100 kΩ potentiometer with 1% linearity uses 30 V supply. What is the potentiometer constant? |
| A. | 0.1 V/turn |
| B. | 10 V/turn |
| C. | 33.33 V/turn |
| D. | 0.3 V/turn |
| Answer» C. 33.33 V/turn | |
| 9. |
Potentiometer is basically a ____________ type instrument |
| A. | Electrostatic |
| B. | Thermal |
| C. | Null |
| D. | Magnetostatic |
| Answer» D. Magnetostatic | |
| 10. |
A Murray loop test is conducted on a 400-m long faulty cable. At balance, the resistance connected to the faulty core was set to 40 Ω and the resistance of the resistor connected to the sound core was 60 Ω. What is the distance of the fault from the test end? |
| A. | 267 m |
| B. | 217 m |
| C. | 160 m |
| D. | 320 m |
| Answer» E. | |
| 11. |
Potentiometer is used for: |
| A. | Accurate measurement of emf of a cell or the potential difference (p.d.) between two points of an electric circuit. |
| B. | Measurement of electrical resistance in the cell |
| C. | Measurement of electric current in a cell |
| D. | Measurement of capacitance of cell. |
| Answer» B. Measurement of electrical resistance in the cell | |
| 12. |
DC potentiometer is an instrument to measure |
| A. | unknown emf |
| B. | large power |
| C. | unknown velocity |
| D. | low torque |
| Answer» B. large power | |
| 13. |
A potentiometer work on |
| A. | Heating effect |
| B. | Magnetic effect |
| C. | Electromagnetic induction |
| D. | None of the above |
| Answer» E. | |
| 14. |
A dc potentiometer is designed to measure up-to about 2 V with a slide wire of 1600 m. Standard cell of emf 1.2 V balances at 1200mm. a test cell is seen to balance at 1400 mm. the emf of the test cell is |
| A. | 1.1 V |
| B. | 1.2 V |
| C. | 1.7 V |
| D. | 1.4 V |
| Answer» E. | |