MCQOPTIONS
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MCQOPTIONS
This section includes 50 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 maxwell bridge is used for measurement of |
| A. | resistance |
| B. | inductances only |
| C. | capacitances |
| D. | both inductances and capacitances |
| Answer» C. capacitances | |
| 2. |
Low resistances are provided with four terminals |
| A. | To facilitate the connection of current and potential circuits |
| B. | To eliminate the effect of leads |
| C. | To eliminate the effect of thermo-electric emfs |
| D. | None of the above |
| Answer» C. To eliminate the effect of thermo-electric emfs | |
| 3. |
During the measurement of resistance by Carey Foster bridge, no error is introduced due to1. contact resistance2. connecting leads3. thermoelectric e.m.fWhich of the above are correct? |
| A. | 1 and 2 only |
| B. | 1 and 3 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» B. 1 and 3 only | |
| 4. |
A zero to 300 V voltmeter has an error of 2% of the full scale deflection. If the true voltage is 30 V, then the range of readings on this voltmeter would be |
| A. | 20 V to 40 V |
| B. | 24 V to 36 V |
| C. | 29.4 V to 30.6 V |
| D. | 29.94 V to 30.06 V |
| Answer» C. 29.4 V to 30.6 V | |
| 5. |
In Schering Bridge the dissipation factor of a series RC circuit is: |
| A. | Cosine of the phase angle |
| B. | tangent of the phase angle |
| C. | cotangent of the phase angle |
| D. | sine of the phase angle |
| Answer» C. cotangent of the phase angle | |
| 6. |
Calculate the percentage error introduced in the calculated value of Q by 0.02 Ω insertion resistance in a coil with a resistance of 10 Ω connected in direct connection in a Q meter. Resonance occurs when oscillator frequency is 1 MHz and resonating capacitor is set at 65 pF. |
| A. | 0.2 percent |
| B. | 5 percent |
| C. | 1.5 percent |
| D. | 0.8 percent |
| Answer» B. 5 percent | |
| 7. |
A megger is a device used for measuring: |
| A. | Extremely high voltages |
| B. | Extremely high currents |
| C. | Extremely high resistances |
| D. | All of the above |
| Answer» D. All of the above | |
| 8. |
In a Schering bridge, the dial of the variable capacitor is calibrated directly in terms of the dissipation factor of the unknown arm. At 50 Hz frequency, the value of the dissipation factor of the unknown capacitor was found to be D. What would be the value of the dissipation factor at 60 Hz |
| A. | 6 D |
| B. | 1 / 6 D |
| C. | 5 / 6 D |
| D. | 6 / 5 D |
| Answer» E. | |
| 9. |
Instrument used to measure Insulation Resistance |
| A. | Multimeter |
| B. | Megger |
| C. | Power meter |
| D. | None of the above |
| Answer» C. Power meter | |
| 10. |
Dissipation factor of a capacitor can be measured with: |
| A. | Galvanometer |
| B. | Campbell bridge |
| C. | Potentiometer |
| D. | Schering bridge |
| Answer» E. | |
| 11. |
A wheat stone bridge has ratio arm of 1000Ω 100Ω resistances, the standard resistance arm consist of 4 decade resistance boxes of 1000, 100, 10, 1Ω steps. The maximum and minimum value of unknown resistance that can be determined with this setup are: |
| A. | 111100Ω. 10Ω |
| B. | 111100Ω, 1Ω |
| C. | 11110Ω, 10Ω |
| D. | 1000Ω, 10Ω |
| Answer» D. 1000Ω, 10Ω | |
| 12. |
R1 and R4 are the opposite arms of a Wheatstone bridge as are R3 and R2, the source voltage is applied across R1 and R3 under balanced conditions which one of the following is true? |
| A. | \({R_1} = \frac{{{R_3}{R_4}}}{2}\) |
| B. | \({R_1} = \frac{{{R_2}{R_3}}}{{{R_4}}}\) |
| C. | \({R_1} = \frac{{{R_2}{R_4}}}{{{R_{3}}}}\) |
| D. | \({R_1} = {R_2} + {R_3} + {R_4}\) |
| Answer» C. \({R_1} = \frac{{{R_2}{R_4}}}{{{R_{3}}}}\) | |
| 13. |
Find the unknown resistance value in a given circuit, given the bridge is balanced. |
| A. | 10.2 Ω |
| B. | 11.7 Ω |
| C. | 10.5 Ω |
| D. | 11.5 Ω |
| Answer» B. 11.7 Ω | |
| 14. |
Insulation resistance of 1 m length of a cable is 104 MΩ. The insulation resistance of 100 m length of the same cable will be linearized by connecting |
| A. | 102 MΩ |
| B. | 104 MΩ |
| C. | 106 MΩ |
| D. | 108 MΩ |
| Answer» B. 104 MΩ | |
| 15. |
High voltage Schering bridge is used for the measurement of |
| A. | Resistance and inductance of a coil |
| B. | Frequency of ac source |
| C. | Loss angle of a capacitor |
| D. | Q of a coil |
| Answer» D. Q of a coil | |
| 16. |
In measuring resistance by voltmeter-ammeter method, the voltmeter can be connected either across supply or across the resistance. If the resistance is low, the voltmeter should be connected |
| A. | across the supply |
| B. | across the resistance |
| C. | either across the supply or across the resistance |
| D. | neither across the supply nor across the resistance |
| Answer» C. either across the supply or across the resistance | |
| 17. |
Megger is used for the measurement of high value of |
| A. | current |
| B. | power |
| C. | insulation resistance |
| D. | voltage |
| Answer» D. voltage | |
| 18. |
Direction: It consists of two statements, one labelled as Statement (I) and the other as Statement (II). Examine these two statements carefully and select the answers to these items using the codes given below:Statement (I): Ammeter and voltmeter method is used for measurement of low as well as medium resistances.Statement (II): Carey-Foster slide wire bridge is a modification of the Wheatstone bridge. |
| A. | Both statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I) |
| B. | Both statement (I) and Statement (II) are individually true and Statement (II) is not the correct explanation of Statement (I) |
| C. | Statement (I) is true but Statement (II) is false |
| D. | Statement (I) is false but Statement (II) is true |
| Answer» C. Statement (I) is true but Statement (II) is false | |
| 19. |
A Wheatstone bridge requires a change of 7 Ω in the unknown resistance arm of the bridge to produce a change in deflection of 3 mm of the galvanometer. The sensitivity and the deflection factor will be nearly |
| A. | 0.23 mm/Ω and 2.3 Ω/mm |
| B. | 0.43 mm/Ω and 2.3 Ω/mm |
| C. | 0.23 mm/Ω and 1.3 Ω/mm |
| D. | 0.43 mm/Ω and 1.3 Ω/mm |
| Answer» C. 0.23 mm/Ω and 1.3 Ω/mm | |
| 20. |
Hay’s bridge is used for measuring: |
| A. | admittance |
| B. | capacitance |
| C. | inductance of high Q factor |
| D. | resistance |
| Answer» D. resistance | |
| 21. |
In case of the Wheatstone bridge shown in the below circuit diagram P = 3 kΩ and Q = 5 kΩ. The null value for the galvanometer is obtained when S = 6 kΩ. Find the value of R and the resistance measurement range of the bridge if ‘S’ value varies from 1 kΩ to 8 kΩ |
| A. | \(\begin{array}{*{20}{l}} {R\; = \;2.6\;k\Omega }\\ {S = 500\;{\rm{\Omega \;}}to\;3.8\;k\;{\rm{\Omega }}} \end{array}\) |
| B. | \(\begin{array}{*{20}{l}} {R\; = \;5.6\;k\Omega }\\ {S = 400\;{\rm{\Omega \;}}to\;5.8\;k\;{\rm{\Omega }}} \end{array}\) |
| C. | \(\begin{array}{*{20}{l}} {R\; = \;1.6\;k\Omega }\\ {S = 500\;{\rm{\Omega \;}}to\;5.8\;k\;{\rm{\Omega }}} \end{array}\) |
| D. | \(\begin{array}{*{20}{l}} {R\; = \;3.6\;k\Omega }\\ {S = 600\;{\rm{\Omega \;}}to\;4.8\;k\;{\rm{\Omega }}} \end{array}\) |
| Answer» E. | |
| 22. |
Among the following, which method is NOT preferred to measure low resistances? |
| A. | Potentiometer method |
| B. | Ammeter-voltmeter method |
| C. | Kelvin bridge method |
| D. | Mega ohm bridge |
| Answer» E. | |
| 23. |
Ballistic galvanometer with high oscillation period and high critical resistance would be best suited for measurement of _____. |
| A. | Capacitance |
| B. | Inductance |
| C. | Current |
| D. | Voltage |
| Answer» B. Inductance | |
| 24. |
Inductance of a coil having Q value in the range of (1 < Q < 10), can be measured by using |
| A. | Hay’s bridge |
| B. | De Sauty’s bridge |
| C. | Maxwell’s bridge |
| D. | Carry Foster’s bridge |
| Answer» D. Carry Foster’s bridge | |
| 25. |
A megger is an instrument that gives the reading in: |
| A. | volt |
| B. | ohm |
| C. | henry |
| D. | ampere |
| Answer» C. henry | |
| 26. |
For a series RLC circuit, the quality factor is defined as the ratio of: |
| A. | resonance frequency to bandwidth |
| B. | reactance to resonance frequency |
| C. | reactance to bandwidth |
| D. | bandwidth to resonance frequency |
| Answer» B. reactance to resonance frequency | |
| 27. |
Determine the unknown resistance R in the given network, if the galvanometer reads zero. |
| A. | \(R=\frac{P}{SQ} \) |
| B. | \(R=\frac{Q}{P}S \) |
| C. | \(R=\frac{P}{Q}S \) |
| D. | \(R=\frac{P-Q}{S} \) |
| Answer» D. \(R=\frac{P-Q}{S} \) | |
| 28. |
A Wheatstone bridge is used for electrical strain gauges, because it has: |
| A. | low sensitivity |
| B. | high sensitivity |
| C. | in zero sensitivity |
| D. | finite sensitivity |
| Answer» C. in zero sensitivity | |
| 29. |
Maxwell's inductance capacitance A.C. bridge is used for measurement of inductance of _________ |
| A. | low and medium Q coils |
| B. | high Q coils |
| C. | low Q coils |
| D. | medium Q coils |
| Answer» E. | |
| 30. |
A Wheatstone bridge has got three resistances taken on clockwise direction as 120 Ω, 150 Ω and 150 Ω. The value of the fourth resistance for null balance would be |
| A. | 150 Ω |
| B. | 120 Ω |
| C. | 300 Ω |
| D. | 750 Ω |
| Answer» C. 300 Ω | |
| 31. |
In the circuit used for measuring resistance (shown below), readings of ammeter and voltmeter are 2 A and 200 V. The ammeter and voltmeter resistances are 0.1 Ω and 2000 Ω respectively. The error in the calculated value of resistance (voltmeter reading / ammeter reading) is- |
| A. | 5% |
| B. | 9% |
| C. | 10% |
| D. | 15% |
| Answer» B. 9% | |
| 32. |
Impedance can be measured using which among the following instrument? |
| A. | LCR meter |
| B. | CRO |
| C. | DSO |
| D. | Function generator |
| Answer» B. CRO | |
| 33. |
In a d’Arsonval galvanometer an iron core is usually used between the permanent magnet pole faces. This is used so that: |
| A. | The effect of stray magnetic field is reduced |
| B. | Moment of inertia of moving parts become smaller |
| C. | Cost of production is reduced |
| D. | Flux density in the air gap becomes high thereby a large deflecting torque is produced |
| Answer» E. | |
| 34. |
Maxwell’s bridge measures an unknown inductance in terms of: |
| A. | Known inductance |
| B. | Known capacitance |
| C. | Known resistance |
| D. | Q of the coil |
| Answer» C. Known resistance | |
| 35. |
In the ohmmeter method of temperature measurement involving thermistor, the output voltage vs temperature characteristic can be linearized by connecting |
| A. | A resistance of proper value in series with the sensor |
| B. | A resistance of suitable value in parallel with the sensor |
| C. | A capacitance of appropriate value in series with the sensor |
| D. | An appropriate capacitance in parallel with the sensor |
| Answer» C. A capacitance of appropriate value in series with the sensor | |
| 36. |
A megger is used to measure ___________. |
| A. | Medium resistance |
| B. | Very low value of resistance |
| C. | High value of resistance, Particular insulation resistance |
| D. | Low value of resistance |
| Answer» D. Low value of resistance | |
| 37. |
For the measurement of high resistances following methods are used:1. Loss of Charge Method2. Direct Deflection Method3. Substitution MethodWhich of the following is/are correct? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | Only 1 |
| D. | 1 and 3 |
| Answer» B. 2 and 3 | |
| 38. |
Low resistance is measured with |
| A. | Kelvin bridge |
| B. | Maxwell’s bridge |
| C. | Wien bridge |
| D. | De Sauty’s bridge |
| Answer» B. Maxwell’s bridge | |
| 39. |
In Wheatstone bridge, bridge balance is considered where |
| A. | There is no current that flows through the galvanometer |
| B. | There is current that flows through the galvanometer |
| C. | There is potential difference between galvanometerterminal |
| D. | The galvanometer reading is maximum |
| Answer» B. There is current that flows through the galvanometer | |
| 40. |
A Megger is essentially a |
| A. | Multimeter |
| B. | Crossed - oil ohmmeter |
| C. | Shunt type ohmmeter |
| D. | Series type ohmmeter |
| Answer» C. Shunt type ohmmeter | |
| 41. |
In the circuit shown below, the variable arm of the bridge is: |
| A. | R1 |
| B. | R2 |
| C. | R3 |
| D. | R4 |
| Answer» D. R4 | |
| 42. |
Megger is essentially a: |
| A. | dynamometer |
| B. | mega-ohmmeter |
| C. | series-type ohmmeter |
| D. | shunt-type ohmmeter |
| Answer» C. series-type ohmmeter | |
| 43. |
Low resistance can be accurately measured by |
| A. | Kelvin Bridge |
| B. | Wheatstone Bridge |
| C. | Wien's Bridge |
| D. | Schering Bridge |
| Answer» B. Wheatstone Bridge | |
| 44. |
An unbalanced DC Wheatstone bridge is shown in the figure. At what value of P will the magnitude of Vo be maximum? |
| A. | \(\sqrt {\left( {1 + x} \right)}\) |
| B. | (1 + x) |
| C. | \(\frac{1}{{\sqrt {1 + x} }}\) |
| D. | \(\sqrt {1 - x}\) |
| Answer» B. (1 + x) | |
| 45. |
Identify the bridge circuit shown in the circuit. |
| A. | Wien parallel bridge |
| B. | De Sauty bridge |
| C. | Wien series bridge |
| D. | Schering bridge |
| Answer» C. Wien series bridge | |
| 46. |
In the bridge circuit shown, at balance condition, the value of C5 = 1 μF and R5 = 2000 Ω. The values of inductance Lx and resistance Rx are |
| A. | 2H, 500 Ω |
| B. | 1H, 750 Ω |
| C. | 1H, 1000 |
| D. | 1H, 500 Ω |
| Answer» E. | |
| 47. |
A resistance-meter has five measurement range-settings between 200 Ω and 2 MΩ in multiples of 10. The meter measures resistance of a device by measuring a full-range voltage of 2 V across the device by passing an appropriate constant current for each range-setting. If a device having a resistance value in the range 8 kΩ to 12 kΩ and a maximum power rating of 100 μW is to be measured safely with this meter, the choice for range-setting on the meter for best resolution in measurement, in kΩ, is |
| A. | 2 |
| B. | 20 |
| C. | 200 |
| D. | 2000 |
| Answer» D. 2000 | |
| 48. |
Kelvin double bridge is best suited for the measurement of |
| A. | Resistances of very low value |
| B. | Low value capacitance |
| C. | Resistances of very high value |
| D. | High value capacitance |
| Answer» B. Low value capacitance | |
| 49. |
In a megger, controlling torque is provided by |
| A. | spring |
| B. | gravity |
| C. | coil |
| D. | eddy current |
| Answer» D. eddy current | |
| 50. |
In a series type ohm meter, the position corresponding to full scale current deflection and position corresponding to zero current indicates |
| A. | 0 Ω and ∞ Ω respectively |
| B. | ∞ Ω and 0 Ω respectively |
| C. | 0 Ω and 1000 kΩ respectively |
| D. | None of the above |
| Answer» B. ∞ Ω and 0 Ω respectively | |