MCQOPTIONS
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MCQOPTIONS
This section includes 47 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering (MCQ) questions and answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If a pressure gauge of range 0-10 bar has a quoted inaccuracy of 1.0 % of full scale reading, then it means |
| A. | Minimum expected error in any reading is 0.1 bar |
| B. | Maximum expected error in any reading is 0.1 bar |
| C. | Maximum expected error in any reading is 1 bar |
| D. | Minimum expected error in any reading is 1 bar |
| Answer» C. Maximum expected error in any reading is 1 bar | |
| 2. |
To produce a change in deflection of 1.5 mm of the galvanometer of Wheatstone bridge, a change of 5 in the unknown arm of bridge is required. The sensitivity is |
| A. | 0.2 mm/ |
| B. | 0.3 mm/ |
| C. | 0.4 mm/ |
| D. | 0.5 mm/ |
| Answer» C. 0.4 mm/ | |
| 3. |
A voltmeter of 0 to 250 V has an error of 1% of full scale deflection. If the true voltage of voltmeter is 25 V then the range of its reading is |
| A. | 22.5 V 27.5 V |
| B. | 27.5 V 29.5 V |
| C. | 24 V 26 V |
| D. | 25.5 V 26.5 V |
| Answer» B. 27.5 V 29.5 V | |
| 4. |
Four observers recorded a set of current measurement as: |
| A. | 0.02 mA |
| B. | 0.06 mA |
| C. | 0.08 mA |
| D. | 1.02 mA |
| Answer» D. 1.02 mA | |
| 5. |
The zero drift is measured in units of |
| A. | Volts- c |
| B. | Volts/ c |
| C. | c/volts |
| D. | (volts) |
| Answer» C. c/volts | |
| 6. |
In a hot wire ammeter the current flowing through the resistance of 10 is given by |
| A. | 2.98 A |
| B. | 3.31 A |
| C. | 3.62 A |
| D. | 4.01 A |
| Answer» C. 3.62 A | |
| 7. |
To convert a 2 mA meter with internal resistance of 120 ohm into an ammeter of range 0 200 mA, the value of shunt resistance required is |
| A. | 1.121 ohm |
| B. | 1.212 ohm |
| C. | 1.312 ohm |
| D. | 1.414 ohm |
| Answer» C. 1.312 ohm | |
| 8. |
For a moving iron ammeter, the change of inductance is 3 H/degree and its spring constant is 4 X 10 N-m/degree. If the maximum deflection of the pointer is 90 degree, then the corresponding current in the coil be |
| A. | 3.89 A |
| B. | 4.05 A |
| C. | 4.89 A |
| D. | 5 A |
| Answer» D. 5 A | |
| 9. |
For extending the range of 0-150 V to 0-500 V in a 10000 /V meter, the value of series resistance required is equal to |
| A. | 3 M |
| B. | 3.5 M |
| C. | 4 M |
| D. | 4.5 M |
| Answer» C. 4 M | |
| 10. |
A current of 2 + 3sin t A is passed through a moving iron instrument and through a PMMC meter respectively. The readings of the two meters are |
| A. | 2 A, 2A |
| B. | 2 A, 2.9 A |
| C. | 2.9 A, 2.9 A |
| D. | 2.9 A, 2 A |
| Answer» E. | |
| 11. |
During a test, the strain gauge with resistance of 200 ohm undergoes a change of 0.120 ohm and the strain of the gauge is 1.2 X10. Then the gauge factor will be |
| A. | 4 |
| B. | 5 |
| C. | 4.5 |
| D. | 6 |
| Answer» C. 4.5 | |
| 12. |
For an ac series circuit, the reso t frequency is given by, f =1/2 LC. The values of a and b will be |
| A. | 2, 2 |
| B. | 1/2, |
| C. | -1/2, -1/2 |
| D. | -1/2,1/2 |
| Answer» D. -1/2,1/2 | |
| 13. |
If the energy stored in a parallel plate capacitor in terms of inductance and capacitance is given by, W = KCV where K is a constant, then the values of a and b are |
| A. | 1, 1 |
| B. | 1, 2 |
| C. | 2, 1 |
| D. | 1/2, 2/3 |
| Answer» C. 2, 1 | |
| 14. |
The given figure shows the Wheatstone bridge method for measurement of unknown resistance (R). |
| A. | P/R = Q/S |
| B. | P/S = Q/R |
| C. | P/R = S/Q |
| D. | R/P = Q/S |
| Answer» B. P/S = Q/R | |
| 15. |
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/ A. 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 | |
| 16. |
In a Wheatstone bridge, if P = 10 1%, Q = 100 1%, R = 20 1% and S is unknown then the unknown resistance will be |
| A. | 200 1% |
| B. | 200 2% |
| C. | 200 3% |
| D. | 100 1% |
| Answer» D. 100 1% | |
| 17. |
For the measurement of low resistances, Kelvin s double bridge has high accuracy because |
| A. | It has two set of ratio arms which eliminates effect of resistance of connecting lead |
| B. | It has a null indicating galvanometer |
| C. | It has two null indicator |
| D. | It has four sets of ratio arms which eliminates the effect of resistance of connecting lead |
| Answer» B. It has a null indicating galvanometer | |
| 18. |
In Maxwell s Inductance-Capacitance bridge, the frequency |
| A. | Is directly proportional to the inductance in the balanced equation |
| B. | Is inversely proportional to the capacitance in the balanced equation |
| C. | Is directly proportional to the product of inductance and capacitance |
| D. | Does not appear in the balanced equations |
| Answer» E. | |
| 19. |
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 | |
| 20. |
If is the loss angle then the dissipation factor is given by |
| A. | sin |
| B. | cos |
| C. | tan |
| D. | cot |
| Answer» D. cot | |
| 21. |
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 | |
| 22. |
Shielding of the capacitor is done to |
| A. | Make the value of capacitor definite |
| B. | Balance the bridge without any problem |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 23. |
At 2 MHz, the reso ce is obtained with a resonating capacitance value of 12 pF and at 400 kHz, the reso ce is obtained with resonating capacitance value of 320 pF. Then the self capacitance of the coil is |
| A. | 0.62 pF |
| B. | 0.83 pF |
| C. | 1.2 pF |
| D. | 1.5 pF |
| Answer» B. 0.83 pF | |
| 24. |
The given figure shows an ac bridge which is balanced at 100 Hz. |
| A. | 149 |
| B. | 159 |
| C. | 169 |
| D. | 189 |
| Answer» C. 169 | |
| 25. |
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 | |
| 26. |
In wattmeter s, errors due to stray fields can be removed by |
| A. | Proper instrument construction |
| B. | Using brake magnet |
| C. | Using shading ring |
| D. | Using two separate ac magnets |
| Answer» B. Using brake magnet | |
| 27. |
Induction wattmeter s can be used with |
| A. | Only AC supply |
| B. | Only DC supply |
| C. | Both AC and DC supply |
| D. | None of these |
| Answer» B. Only DC supply | |
| 28. |
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 | |
| 29. |
A electrodynamic ammeter has current flowing through it of 20 A and torsional constant of controlling spring of 10 N-m/degree. If the mutual inductance changes uniformly at the rate of 0.0025 H/degree, then its angular deflection for full scale is |
| A. | 43.68 degree |
| B. | 57.29 degree |
| C. | 68.32 degree |
| D. | 69.69 degree |
| Answer» C. 68.32 degree | |
| 30. |
For a dynamometer wattmeter, the variation of inductance with angular position of moving system is 0.06 mH/radian and spring constant is 10 X 10 N-m/radian. The current flowing in the instrument is 8 A. If the full scale deflection is 76 degree, then the current required in the voltage coil at full scale on d.c. circuit is |
| A. | 27.6 A |
| B. | 29.89 A |
| C. | 35.3 A |
| D. | 37.28 A |
| Answer» B. 29.89 A | |
| 31. |
A Kelvin s multicellular voltmeter has a torsion head and a coach spring for |
| A. | Protection against accidental fraction of suspension due to vibration |
| B. | For zero adjustment |
| C. | Torsion head for zero adjustment and coach spring for protection against accidental fraction of suspension due to vibration |
| D. | Torsion head for protection against accidental fraction of suspension due to vibration and coach spring for zero adjustment |
| Answer» D. Torsion head for protection against accidental fraction of suspension due to vibration and coach spring for zero adjustment | |
| 32. |
Swamping resistance is a resistance made up of |
| A. | Alloy of manganin and copper |
| B. | Alloy of aluminium and copper |
| C. | Alloy of nickel and cobalt |
| D. | Alloy of manganin and aluminium |
| Answer» B. Alloy of aluminium and copper | |
| 33. |
The unit of lumi ce is |
| A. | Lumen |
| B. | Candela per square meter |
| C. | Lux |
| D. | Lumen per square meter |
| Answer» C. Lux | |
| 34. |
If the reading of the two wattmeter s is equal and opposite while measuring power in a 3 phase induction motor then the power factor of the load will be |
| A. | Unity |
| B. | Zero |
| C. | 0.5 lagging |
| D. | 0.5 leading |
| Answer» C. 0.5 lagging | |
| 35. |
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. | |
| 36. |
A PMMC instrument gives full scale deflection at 40 mV potential difference and 8 mA current. What will be the required shunt resistance when it is used as ammeter of range 0 10 A? |
| A. | 0.002 ohm |
| B. | 0.003 ohm |
| C. | 0.004 ohm |
| D. | 0.005 ohm |
| Answer» D. 0.005 ohm | |
| 37. |
A permanent magnet moving coil gives full scale deflection at 40 mV potential difference and 8 mA current. What will be the required series resistance when it is used as voltmeter of range 0 200 V? |
| A. | 19556 ohm |
| B. | 20163 ohm |
| C. | 23884 ohm |
| D. | 24995 ohm |
| Answer» E. | |
| 38. |
Strain gauge is a |
| A. | Active device and converts mechanical displacement into a change of resistance |
| B. | Passive device and converts electrical displacement into a change of resistance |
| C. | Passive device and converts mechanical displacement into a change of resistance |
| D. | Active device and converts electrical displacement into a change of resistance |
| Answer» D. Active device and converts electrical displacement into a change of resistance | |
| 39. |
Systematic errors in a measurement system are caused by |
| A. | System disturbance during measurement |
| B. | Effect of environmental changes |
| C. | Use of uncalibrated instruments |
| D. | All of these |
| Answer» E. | |
| 40. |
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% | |
| 41. |
Suitable method for the reduction of systematic errors is/are |
| A. | Instrument must be designed carefully |
| B. | By introducing an equal and opposite environmental input for compensating the effect of environmental input in a measurement system |
| C. | By adding high gain feedback to measurement system |
| D. | All of these |
| Answer» E. | |
| 42. |
If the resistance in a circuit is given by 80 0.2% and the current flowing through it is 5A 0.1%, then the uncertainty in the power will be |
| A. | 0.2 % |
| B. | 0.4 % |
| C. | 0.6 % |
| D. | 0.8 % |
| Answer» C. 0.6 % | |
| 43. |
What will be the limiting error of the resultant capacitance obtained by connecting two capacitance in parallel where C = 250 4 F and C = 200 3 F? |
| A. | 3 F |
| B. | 4 F |
| C. | 7 F |
| D. | 1.7 F |
| Answer» D. 1.7 F | |
| 44. |
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% | |
| 45. |
A voltmeter connected across an unknown resistance has scale of 0 to 150 V reads 50 V when the current flowing in the circuit is 1 mA. If sensitivity of the voltmeter is 15k /V, then the percentage error due to loading effect is |
| A. | 1.5% |
| B. | 2.12% |
| C. | 2.22% |
| D. | 2.5% |
| Answer» D. 2.5% | |
| 46. |
If R= 15 2% and R= 20 2% are the resistance connected in parallel then the value of the resistance for the parallel combination is |
| A. | 8.57 2% |
| B. | 8.57 4% |
| C. | 8.57 3% |
| D. | 8.57 2.5% |
| Answer» B. 8.57 4% | |
| 47. |
If the two voltage measurements are V1 = 150 2% and V2 = 100 4% respectively. Then the maximum percentage error in the sum of two voltage measurements is |
| A. | 2.4 % |
| B. | 2.6 % |
| C. | 2.8 % |
| D. | 3.4 % |
| Answer» D. 3.4 % | |