MCQOPTIONS
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MCQOPTIONS
This section includes 27 Mcqs, each offering curated multiple-choice questions to sharpen your Electrician And Wireman knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A series of capacitance voltmeter can measure: |
| A. | DC current |
| B. | AC voltage |
| C. | DC voltage |
| D. | AC current |
| Answer» C. DC voltage | |
| 2. |
Among the following, which meter is regarded as insulation tester? |
| A. | Megger |
| B. | Frequency meter |
| C. | Insulator |
| D. | Wattmeter |
| Answer» B. Frequency meter | |
| 3. |
Current is measured using: |
| A. | Megger |
| B. | Voltmeter |
| C. | Thermometer |
| D. | Ammeter |
| Answer» E. | |
| 4. |
Differential transformer transducer is used for measurement of |
| A. | speech and music |
| B. | displacement |
| C. | liquid level |
| D. | temperature |
| Answer» C. liquid level | |
| 5. |
In a single phase induction type energy meter, maximum torque is produced when the shunt magnetic flux: |
| A. | Is in phase with the supply voltage |
| B. | Lags the supply voltage by 45 degrees |
| C. | Lags the supply voltage by 90 degrees |
| D. | Leads the supply voltage by 90 degrees |
| Answer» D. Leads the supply voltage by 90 degrees | |
| 6. |
Current transformer uses: |
| A. | Toroidal transformer |
| B. | Step-up transformer |
| C. | Centre-tap transformer |
| D. | Step-down transformer |
| Answer» C. Centre-tap transformer | |
| 7. |
Potential Transformer uses: |
| A. | Step-up transformer |
| B. | centre tap transformer |
| C. | step-down transformer |
| D. | toroidal transformer |
| Answer» D. toroidal transformer | |
| 8. |
KVAR meters are used to measure the _______ component of KVA in a three-phase circuit. |
| A. | Faraday |
| B. | Lorentz |
| C. | Biot-Savart's |
| D. | Wattless |
| Answer» E. | |
| 9. |
Insulation resistance is measured by which meter? |
| A. | Oscilloscope |
| B. | VTVM |
| C. | Wein bridege |
| D. | Megger |
| Answer» E. | |
| 10. |
Among the following which device cannot be used as a safety device? |
| A. | Fuse |
| B. | Earth tester |
| C. | Circuit breaker |
| D. | ELCB |
| Answer» C. Circuit breaker | |
| 11. |
Kelvin bridge is used to measure |
| A. | Current |
| B. | Capacitance |
| C. | Inductance |
| D. | Low resistance |
| Answer» E. | |
| 12. |
In moving iron instruments, eddy current damping cannot be used as |
| A. | They have a strong operating field |
| B. | They are not normally used in vertical position |
| C. | They need a large damping force, which can only provide by air friction |
| D. | The introduction of permanent magnet required for eddy current damping would distort the existing weak operating magnetic field |
| Answer» E. | |
| 13. |
In an electric vehicle, a speedometer displays the speed of the vehicle, whereas a/an ________ displays the speed of the motor: |
| A. | tachometer |
| B. | barometer |
| C. | magnetometer |
| D. | altimeter |
| Answer» B. barometer | |
| 14. |
Electrostatic voltmeters are particularly suitable for measuring high voltage because the construction is simplified due to |
| A. | Large electrostatic forces |
| B. | Small electrostatic forces |
| C. | Large value of current |
| D. | Small value of current |
| Answer» E. | |
| 15. |
In a measuring instrument, the torque produced by the measurand is called: |
| A. | Damping torque |
| B. | Controlling torque |
| C. | Deflecting torque |
| D. | Staring torque |
| Answer» D. Staring torque | |
| 16. |
Frequency can be measured using: |
| A. | Owen’s bridge |
| B. | Maxwell’s bridge |
| C. | Wien’s bridge |
| D. | Schering’s bridge |
| Answer» D. Schering’s bridge | |
| 17. |
In a 3-phase system balanced star connected system, how many minimum watt-meters are sufficient to measure the total power? |
| A. | 4 |
| B. | 2 |
| C. | 1 |
| D. | 3 |
| Answer» D. 3 | |
| 18. |
How is a Lissajous pattern created? |
| A. | By drawing two square waves on different axis |
| B. | By drawing square wave and sine wave on the same axis |
| C. | By drawing two sine waves which are at right angles to each other |
| D. | By drawing two sine waves on the same axis |
| Answer» D. By drawing two sine waves on the same axis | |
| 19. |
In an energy meter the magnitude of flux varies: |
| A. | Due to the induced EMF in the windings |
| B. | Due to abnormal currents and voltages |
| C. | Due to change in the transformer turns |
| D. | Due to high resistance and inductance |
| Answer» C. Due to change in the transformer turns | |
| 20. |
Dummy strain gauges are used for |
| A. | compensation of temperature changes |
| B. | increasing the sensitivity of bridge in which they are included |
| C. | compensating for different expansion |
| D. | calibration of strain gauges |
| Answer» B. increasing the sensitivity of bridge in which they are included | |
| 21. |
_____ instruments may be used as standard instruments for calibrating deflection instruments. |
| A. | Analog |
| B. | Mechanical |
| C. | Digital |
| D. | Secondary |
| Answer» D. Secondary | |
| 22. |
Identify the type of error the instrument shows as in the given figure. |
| A. | Span Error |
| B. | Hysteresis Error |
| C. | Linearity Error |
| D. | Zero Error |
| Answer» C. Linearity Error | |
| 23. |
Permanent magnet moving coil instrument can be used in |
| A. | ac work only |
| B. | both dc and ac work |
| C. | dc work only |
| D. | neither dc nor ac work |
| Answer» D. neither dc nor ac work | |
| 24. |
In a PMMC instrument, the swamping resistor is used to |
| A. | Increase the damping of the instrument |
| B. | Reduce the current within safe limits |
| C. | Compensate for temperature variations |
| D. | Increase the full-scale sensitivity |
| Answer» D. Increase the full-scale sensitivity | |
| 25. |
If one of the control springs of a permanent magnet coil ammeter is broken, then on being connected it will read. |
| A. | Zero |
| B. | Half of the correct value |
| C. | Twice the correct value |
| D. | An infinite value |
| Answer» B. Half of the correct value | |
| 26. |
An average responding rectifier type electronic ac voltmeter has its scale calibrated in terms of the rms value of a sine wave. If a square wave voltage of peak amplitude of 100 V is measured using this voltmeter, what will be the reading indicated by the meter? |
| A. | 111 V |
| B. | 100 V |
| C. | 90.09 V |
| D. | 70.7 V |
| Answer» B. 100 V | |
| 27. |
A 60 microampere meter has a resistance of 100 ohms. If the meter has to measure 100 mA, then the value of current through the shunt is |
| A. | 100 mA |
| B. | 99.2 mA |
| C. | 99.9 mA |
| D. | 150 mA |
| Answer» D. 150 mA | |