MCQOPTIONS
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MCQOPTIONS
This section includes 131 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
While measuring resistance by the voltmeter-ammeter method, the maximum possible percentage error in the voltmeter and ammeter are ± 1.8% and ± 1.2% respectively. Then the maximum possible percentage error in the value of resistance will be |
| A. | ± 3% |
| B. | ± 4% |
| C. | ± 4.2% |
| D. | ± 4.8% |
| Answer» B. ± 4% | |
| 2. |
With the increase in the intensity of light, the resistance of a photovoltaic cell |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | None of these |
| Answer» C. Remains same | |
| 3. |
X-Y recorders is the type of |
| A. | Graphic recorders |
| B. | Oscillographic recorders |
| C. | Magnetic tape recorders |
| D. | Digital recorders |
| Answer» B. Oscillographic recorders | |
| 4. |
Which of the following statements are correct I. Repeatability means the closeness of output readings when the same input is applied repetitively over a short period of time, with the same measurement conditions and same instruments. II. Reproducibility means the closeness of output readings for the same input when there are changes in the method of measurement and conditions of measurement. |
| A. | Both I and II are correct |
| B. | Only I is correct |
| C. | Only II is correct |
| D. | Both are incorrect |
| Answer» B. Only I is correct | |
| 5. |
Which among the following is not the type of digital voltmeters? |
| A. | Ramp type |
| B. | Integrating |
| C. | Potentiometric type |
| D. | None of these |
| Answer» E. | |
| 6. |
When visual indication of pressure level is required then the instrument generally used is |
| A. | Monometers |
| B. | Diaphragm sensors |
| C. | Bourdon tube |
| D. | Resonant wire device |
| Answer» B. Diaphragm sensors | |
| 7. |
When a voltmeter-ammeter method is applied for the measurement of resistance, the voltmeter reads a value of 8.28 V and the ammeter reading is 4.14 mA. Then the value of the resistance will be |
| A. | 2 kΩ |
| B. | 2.0 kΩ |
| C. | 2.00 kΩ |
| D. | 2.000 kΩ |
| Answer» D. 2.000 kΩ | |
| 8. |
When a 100 V moving iron voltmeter is of accuracy class 1-0 is used in a circuit, it reads 50 V. Then the maximum possible percentage error in the reading is |
| A. | 1 % |
| B. | 2 % |
| C. | 2.5 % |
| D. | 3 % |
| Answer» C. 2.5 % | |
| 9. |
What will happen if the current coil and potential coil of dynamometer type wattmeter is interchanged? |
| A. | Potential coil will get damaged |
| B. | Current coil will get damaged |
| C. | Both current coil and potential coil will get damaged |
| D. | Neither potential coil nor current coil will get damaged |
| Answer» C. Both current coil and potential coil will get damaged | |
| 10. |
Vibration galvanometer are generally used |
| A. | For measuring electric charges |
| B. | As null-point detectors in ac bridges |
| C. | As null-point detectors in dc bridges |
| D. | For measuring power |
| Answer» C. As null-point detectors in dc bridges | |
| 11. |
Under normal operating condition, the excitation current of current transformer and potential transformer |
| A. | Both varies over a wide range |
| B. | Varies over a wide range, remains constant |
| C. | Remains constant, varies over a wide range |
| D. | Both remains constant |
| Answer» C. Remains constant, varies over a wide range | |
| 12. |
To read and record a measurement, the indicating type instrument |
| A. | Always requires human intervention |
| B. | Does not requires human intervention |
| C. | Requires human intervention only when the instrument consists of a rotating pointer moving against a scale |
| D. | Requires human intervention only when the instrument consists of a rotating scale moving against a pointer |
| Answer» B. Does not requires human intervention | |
| 13. |
To produce a change of 2 mm in deflection of galvanometer, a change of 4 ohm is required in the unknown arm of a Wheatstone bridge. The sensitivity of the galvanometer is |
| A. | 1 mm/ohm |
| B. | 0.5 mm/ohm |
| C. | 1.5 mm/ohm |
| D. | 2 mm/ohm |
| Answer» C. 1.5 mm/ohm | |
| 14. |
To produce a change in deflection of 1.5 mm of the galvanometer of Wheatstone bridge, a change of 5Ω in the unknown arm of bridge is required. The sensitivity is |
| A. | 0.2 mm/ Ω |
| B. | 0.3 mm/ Ω |
| C. | 0.4 mm/ Ω |
| D. | 0.5 mm/ Ω |
| Answer» C. 0.4 mm/ Ω | |
| 15. |
To avoid wastage of power during calibration in dynamometer type wattmeter |
| A. | Phantom loading is used |
| B. | Brake magnet is used |
| C. | Spring is used |
| D. | Capacitance is used |
| Answer» B. Brake magnet is used | |
| 16. |
The Wien’s bridge is suitable for the measurement of frequency of the range of |
| A. | Less than 100 Hz |
| B. | 100 Hz to 100 kHz |
| C. | 1 kHz to 100 MHz |
| D. | More than 100 MHz |
| Answer» C. 1 kHz to 100 MHz | |
| 17. |
The voltage multiplication factor of a PMMC instrument is |
| A. | Directly proportional to the required series resistance |
| B. | Directly proportional to the shunt resistance |
| C. | Inversely proportional to the shunt resistance |
| D. | Directly proportional to the required series resistance |
| Answer» B. Directly proportional to the shunt resistance | |
| 18. |
The vibration galvanometer used as detector, it responds |
| A. | Only to the fundamental frequency |
| B. | Only to the harmonics frequency |
| C. | Both (a) and (b) |
| D. | Does not respond to any frequency |
| Answer» B. Only to the harmonics frequency | |
| 19. |
The unit of luminance is |
| A. | Lumen |
| B. | Candela per square meter |
| C. | Lux |
| D. | Lumen per square meter |
| Answer» C. Lux | |
| 20. |
The two wattmeters used for the measurement of power input read 50 kW each. What will be the readings of the two wattmeter if the power factor is changed to 0.8 leading keeping the total input power same? |
| A. | 28.35W, 71.65W |
| B. | 31.25W, 73.71W |
| C. | 33.33W, 73.33W |
| D. | 38.35W, 75.5W |
| Answer» B. 31.25W, 73.71W | |
| 21. |
The true power measured by the wattmeter whose range is 500 W and an error of ± 2% of full scale deflection is 150 W. The relative error while reading 150 W will be |
| A. | ± 4% |
| B. | ± 5.39% |
| C. | ± 6.67% |
| D. | ± 1.5% |
| Answer» D. ± 1.5% | |
| 22. |
The transducer used for the measurements is/are |
| A. | Resistance temperature detectors |
| B. | Thermistors |
| C. | Ultrasonic |
| D. | All of these |
| Answer» E. | |
| 23. |
The time response of an indicating instrument is determined from the |
| A. | Damping torque |
| B. | Controlling torque |
| C. | Deflecting torque |
| D. | All of these |
| Answer» B. Controlling torque | |
| 24. |
The smallest change which can be measured by the transducer of the range of 0 to 150 N force and resolution of 0.1% of full scale is |
| A. | 0.1 N |
| B. | 0.15 N |
| C. | 0.3 N |
| D. | 0.35 N |
| Answer» C. 0.3 N | |
| 25. |
The sensitivity of the bridge is maximum when |
| A. | P/R = Q/S = 0 |
| B. | P/R = 1 |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» C. Both (a) and (b) | |
| 26. |
The sensitivity of a measurement is a measure of |
| A. | Change in instrument output when the quantity being measured changes by a given amount |
| B. | Closeness of output readings for the same input when there are changes in the method of measurement |
| C. | Ratio of output to the input |
| D. | Closeness of output reading of instrument to the true value |
| Answer» B. Closeness of output readings for the same input when there are changes in the method of measurement | |
| 27. |
The resistances of the various arms of Wheatstone bridge are P = 500 ohm, Q = 50 ohm, R = 1010 ohm and S = 100 ohm. The emf of the batter is 5 V and the current sensitivity of galvanometer is 8 mm/μA. If the internal resistance of the galvanometer is 80 ohm then the deflection of galvanometer and the sensitivity of the bridge in terms of deflection per unit change of resistance are |
| A. | 151.2 mm, 30.24 mm/ohm |
| B. | 100 mm, 21.03 mm/ohm |
| C. | 186 mm, 40.37 mm/ohm |
| D. | 193 mm, 20.74 mm/ohm |
| Answer» B. 100 mm, 21.03 mm/ohm | |
| 28. |
The resistance potential divider method and capacitance potential divider method is used for |
| A. | Both AC and DC |
| B. | Former method can be used for both AC and DC and the later method can be used only for AC |
| C. | Former method can be used for AC only and the later method can be used for both AC and DC |
| D. | Former method can be used for DC only and the later method can be used only for AC |
| Answer» C. Former method can be used for AC only and the later method can be used for both AC and DC | |
| 29. |
The ratio of maximum current (with shunt) to the full scale deflection current (without current) in a permanent magnet moving coil instrument is known as |
| A. | Sensitivity |
| B. | Multiplying factor |
| C. | Multiplying power |
| D. | Both (b) and (c) |
| E. | None of these |
| Answer» E. None of these | |
| 30. |
The Q meter works on the principle of |
| A. | Series resonance |
| B. | Parallel resonance |
| C. | Both (a) and (b) |
| D. | Neither series resonance nor parallel resonance |
| Answer» B. Parallel resonance | |
| 31. |
The process of measurement |
| A. | Always disturbs the system being measured |
| B. | It may or may not disturb the system being measured |
| C. | Never disturbs the system being measured |
| D. | None of these |
| Answer» B. It may or may not disturb the system being measured | |
| 32. |
The output reading of an instrument is |
| A. | Linearly proportional to the quantity being measured |
| B. | Inversely proportional to the quantity being measured |
| C. | Exponentially proportional to the quantity being measured |
| D. | Not related to the quantity being measured |
| Answer» B. Inversely proportional to the quantity being measured | |
| 33. |
The output of an analogue instrument varies |
| A. | Continuously and can have an infinite number of values within its range of instruments |
| B. | In discrete steps and can have an infinite number of values within its range of instruments |
| C. | Continuously and can have an finite number of values within its range of instruments |
| D. | In discrete steps and can have an infinite number of values within its range of instruments |
| Answer» B. In discrete steps and can have an infinite number of values within its range of instruments | |
| 34. |
The nominal ratio for a current transformer is given by |
| A. | rated primary winding current / rated secondary winding current |
| B. | no. of turns in the primary winding / no. of turns in the secondary winding |
| C. | no. of turns in the secondary winding / no. of turns in the primary winding |
| D. | rated secondary winding current / rated primary winding current |
| Answer» B. no. of turns in the primary winding / no. of turns in the secondary winding | |
| 35. |
The multiplying factor of a PMMC used as ammeter is |
| A. | Directly proportional to the shunt resistance |
| B. | Inversely proportional to the shunt resistance |
| C. | Inversely proportional to the series resistance |
| D. | Directly proportional to the series resistance |
| Answer» C. Inversely proportional to the series resistance | |
| 36. |
The method/methods suitable for the measurement of low resistance is/are |
| A. | Ammeter-voltmeter method |
| B. | Kelvin’s double bridge method |
| C. | Potentiometer method |
| D. | All of these |
| Answer» E. | |
| 37. |
The measurements which can be simplifies by using X-Y recorders is /are |
| A. | Speed-torque characteristics of motors |
| B. | Regulation curves of power supplies |
| C. | Hysteresis curves |
| D. | All of these |
| Answer» E. | |
| 38. |
The Maxwell’s Inductance-Capacitance bridge is not suitable for the measurement inductance of coil if the Q factor is |
| A. | Less than 1 |
| B. | Between 1 to 10 |
| C. | More than 10 |
| D. | Both (a) and (c) |
| Answer» E. | |
| 39. |
The instrument which is not suitable for the application in automatic control scheme |
| A. | Rotameters |
| B. | Pitot static tube |
| C. | Rotary piston meter |
| D. | Orifice plate |
| Answer» B. Pitot static tube | |
| 40. |
The instrument which can be used only with the a.c. supply is / are |
| A. | Induction type |
| B. | Electrostatic type |
| C. | Electrodynamometer type |
| D. | All of these |
| Answer» B. Electrostatic type | |
| 41. |
The induction type single-phase watt-hour meters uses |
| A. | Control spring |
| B. | Pointer |
| C. | Brake magnet and spindle |
| D. | All of these |
| Answer» D. All of these | |
| 42. |
The Hay’s bridge is suitable for the measurement of inductances of coils with Q factor |
| A. | More than 10 |
| B. | Less than 1 |
| C. | More than 1 |
| D. | Less than 10 |
| Answer» B. Less than 1 | |
| 43. |
The frequency and supply voltage of induction wattmeter’s are |
| A. | Constant, constant |
| B. | Constant, variable |
| C. | Variable, constant |
| D. | Variable, variable |
| Answer» B. Constant, variable | |
| 44. |
The example of low resistance is/are |
| A. | Resistance of armature windings of electrical machine |
| B. | Resistance of series field winding of a dc machine |
| C. | Resistances of shunts and lead wires |
| D. | All of these |
| Answer» E. | |
| 45. |
The electrolytic energy meters are essentially |
| A. | A true watt-hour meter |
| B. | An ampere hour meter |
| C. | Either watt-hour or ampere hour meter |
| D. | Neither watt-hour nor ampere hour meter |
| Answer» C. Either watt-hour or ampere hour meter | |
| 46. |
The dynamometer wattmeter’s are |
| A. | More accurate on dc supply |
| B. | More accurate on ac supply |
| C. | Equally accurate on both ac and dc supply |
| D. | None of these |
| Answer» D. None of these | |
| 47. |
The difference between the measured value and the true value is known as |
| A. | Relative error |
| B. | Random error |
| C. | Absolute error |
| D. | Systematic error |
| Answer» D. Systematic error | |
| 48. |
The devices used for flow obstruction is/are |
| A. | Orifice plate |
| B. | Venturi tube |
| C. | Flow nozzle and dall flow tube |
| D. | All of these |
| Answer» E. | |
| 49. |
The device which is used for making temporary measurements of flow is |
| A. | Venturi |
| B. | Dull flow tube |
| C. | Orifice plate |
| D. | Pitot static tube |
| Answer» D. Pitot static tube | |
| 50. |
The deflection angle in hot wire instruments is |
| A. | Directly proportional to the current |
| B. | Directly proportional to the square of current |
| C. | Inversely proportional to the current |
| D. | Inversely proportional to the square of current |
| Answer» C. Inversely proportional to the current | |