MCQOPTIONS
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MCQOPTIONS
This section includes 250 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. |
Which part is called as heart of CRO? |
| A. | CRT |
| B. | Sweep generator |
| C. | Trigger circuit |
| D. | Amplifier |
| Answer» B. Sweep generator | |
| 2. |
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% | |
| 3. |
X - Y recorder is the type of |
| A. | Graphic recorders |
| B. | Oscillographic recorders |
| C. | Magnetic tape recorders |
| D. | Digital recorders |
| Answer» B. Oscillographic recorders | |
| 4. |
Zero drift or bias describes the effect |
| A. | Where the zero reading of an instrument is modified by a change in ambient conditions |
| B. | Where the zero reading is achieved by increasing sensitivity |
| C. | Where the zero reading is achieved by increasing linearity |
| D. | None of these |
| Answer» B. Where the zero reading is achieved by increasing sensitivity | |
| 5. |
Which among the following is not true about the induction instruments? |
| A. | It can be used for ac measurements only |
| B. | Damping is very efficient in case of induction instruments |
| C. | Compensation for frequency temperature is not required |
| D. | Cost is relatively high |
| Answer» D. Cost is relatively high | |
| 6. |
Which among the following is not a type of digital voltmeters? |
| A. | Ramp type |
| B. | Integrating |
| C. | Potentiometric type |
| D. | None of these |
| Answer» E. | |
| 7. |
When an AC signal is applied across the permanent magnet moving coil voltmeter, then the pointer will |
| A. | Not deflect |
| B. | Oscillate around zero volt |
| C. | Deflect to its maximum |
| D. | Oscillate from minimum to maximum value |
| Answer» C. Deflect to its maximum | |
| 8. |
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 | |
| 9. |
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 % | |
| 10. |
Wheatstone bridge is suitable for the measurement of |
| A. | Low resistance |
| B. | Medium resistance |
| C. | High resistance |
| D. | Very high resistance |
| Answer» C. High resistance | |
| 11. |
What will happen if the current coil & 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 | |
| 12. |
What will be the power factor of an inductive load if the reading of the two wattmeters connected to measure input power of a 3 phase induction motor is 6: 3? |
| A. | 0.86 |
| B. | 0.89 |
| C. | 0.91 |
| D. | 0.95 |
| Answer» B. 0.89 | |
| 13. |
What will a moving iron ammeter read if a rectangular waveform current with peak value of 120 mA is passed through it? |
| A. | 120 mA |
| B. | 84.8 mA |
| C. | 169.7 mA |
| D. | 60 mA |
| Answer» B. 84.8 mA | |
| 14. |
Under balanced condition, the current flowing through the detector is equal to |
| A. | 1 A |
| B. | 0 A |
| C. | Sum of the currents flowing in the adjacent arms |
| D. | Difference between the current flowing in the adjacent arms |
| Answer» C. Sum of the currents flowing in the adjacent arms | |
| 15. |
Turbine meters are generally preferred for |
| A. | Low viscosity and high flow measurements |
| B. | High viscosity and low flow measurements |
| C. | High viscosity and high flow measurements |
| D. | Low viscosity and low flow measurements |
| Answer» B. High viscosity and low flow measurements | |
| 16. |
To read and record a measurement, the indicating type instruments |
| 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 | |
| 17. |
To produce a change in deflection of 1.5 mm of the galvanometer of Wheatstone bridge, a change of 5 Ω 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 | |
| 18. |
To increase the current sensitivity below 10 mV, electronic instrument uses |
| A. | Amplifiers |
| B. | Modulator |
| C. | Transducer |
| D. | Oscillator |
| Answer» B. Modulator | |
| 19. |
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 | |
| 20. |
Thermistor is a transducer. Its temperature coefficient is |
| A. | Negative |
| B. | Positive |
| C. | Zero |
| D. | None of these |
| Answer» B. Positive | |
| 21. |
The Wien’s bridges 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. |
The vibration galvanometers are sensitive to power for frequency range of |
| A. | 200 Hz and below |
| B. | 200 Hz to about 4 kHz |
| C. | 4 kHz and above |
| D. | Any frequency |
| Answer» B. 200 Hz to about 4 kHz | |
| 23. |
The undesirable characteristics of a measuring system is / are |
| A. | Drift |
| B. | Dead zone |
| C. | Non linearity |
| D. | All of these |
| Answer» E. | |
| 24. |
The two wattmeters used for the measurement of power input read 50 kW each. What will be the readings of the two wattmeters 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 | |
| 25. |
The transformer ratio of the transformer depends upon the |
| A. | Exciting current |
| B. | Secondary current |
| C. | Power factor of secondary circuit |
| D. | All of these |
| Answer» E. | |
| 26. |
The transducer used for the measurements is / are |
| A. | Resistance temperature detectors |
| B. | Thermistors |
| C. | Ultrasonic |
| D. | All of these |
| Answer» E. | |
| 27. |
The thermocouple instruments works on the principle of Seebeck effect. The amount of heat produced 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 | |
| 28. |
The thermocouple ammeter scale is |
| A. | Linear |
| B. | Cramped at low end and open at high end |
| C. | Open at low end and cramped at high end |
| D. | Cramped at the middle |
| Answer» C. Open at low end and cramped at high end | |
| 29. |
The temperature errors in induction instruments can be compensated by |
| A. | Hunting in both ammeters and voltmeters |
| B. | Combination of shunt and swamping resistance in both ammeters and voltmeters |
| C. | Hunting in case of ammeters and Combination of shunt and swamping resistance in case of voltmeters |
| D. | Combination of shunt and swamping resistance in case of ammeters and hunting in case of voltmeters |
| Answer» D. Combination of shunt and swamping resistance in case of ammeters and hunting in case of voltmeters | |
| 30. |
The systematic errors of an instrument can be reduced by making |
| A. | The sensitivity of instrument to environmental input as low as possible |
| B. | The sensitivity of instrument to environmental input as high as possible |
| C. | Systematic errors does not depend on the sensitivity of instrument |
| D. | None of these |
| Answer» B. The sensitivity of instrument to environmental input as high as possible | |
| 31. |
The sweep generator of a CRO is used to produce |
| A. | Sinusoidal voltage for the horizontal deflection of electron beam |
| B. | Saw tooth voltage for the vertical deflection of electron beam |
| C. | Sinusoidal voltage for the vertical deflection of electron beam |
| D. | Saw tooth voltage for the horizontal deflection of electron beam |
| Answer» E. | |
| 32. |
The spring which is used for producing controlling torque in indicating instruments are made up of materials which is / are |
| A. | Non - magnetic |
| B. | Not subjected to much fatigue |
| C. | Low specific resistance and low temperature resistance coefficient |
| D. | All of these |
| Answer» E. | |
| 33. |
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 | |
| 34. |
The sensitivity of Wheatstone bridge is defined as ratio of |
| A. | Deflection of the galvanometer to the unit fractional change in the value of unknown resistance |
| B. | Square of the deflection of the galvanometer to the unit fractional change in the value of unknown resistance |
| C. | Deflection of the galvanometer to the twice of the unit fractional change in the value of unknown resistance |
| D. | Unit fractional change in the value of unknown resistance to the deflection of the galvanometer |
| Answer» B. Square of the deflection of the galvanometer to the unit fractional change in the value of unknown resistance | |
| 35. |
The sensitivity drift is also known as scale factor drift defines the amount by which an instruments sensitivity of measurement varies as ambient conditions change. It is measured in units of |
| A. | (angular degree / bar) / °C |
| B. | °C / (angular degree / bar) |
| C. | (angular degree - bar) / °C |
| D. | °C / (angular degree - bar) |
| Answer» B. °C / (angular degree / bar) | |
| 36. |
The Schering bridges can be used at |
| A. | low voltage |
| B. | high voltage |
| C. | medium voltage |
| D. | both (a) and (b) |
| E. | all the above |
| Answer» E. all the above | |
| 37. |
The scales of gravity controlled instruments are |
| A. | Uniform |
| B. | Non - uniform and cramped or crowded at the middle |
| C. | Non - uniform and cramped or crowded at their lower ends |
| D. | Non - uniform and cramped or crowded in the first half |
| Answer» D. Non - uniform and cramped or crowded in the first half | |
| 38. |
The scale of PMMC type instruments is |
| A. | Uniform |
| B. | Non - uniform |
| C. | Cramped at the lower ends |
| D. | Crowded in the middle |
| Answer» B. Non - uniform | |
| 39. |
The scale of induction wattmeter extends over |
| A. | 70 degree |
| B. | 120 degree |
| C. | 180 degree |
| D. | 300 degree |
| Answer» E. | |
| 40. |
The scale of electrodynamic instrument when it is used as ammeter and when it is used as voltmeter is |
| A. | Uniform, uniform |
| B. | Crowded near zero, crowded near zero |
| C. | Cramped near zero, cramped in the middle |
| D. | Uniform, cramped near zero |
| Answer» C. Cramped near zero, cramped in the middle | |
| 41. |
The scale of dynamometer wattmeter is |
| A. | Approximately uniform |
| B. | Cramped at the middle |
| C. | Cramped at the end points |
| D. | Crowded in the first half |
| Answer» B. Cramped at the middle | |
| 42. |
The restoring torque in a spring controlled indicating instrument is |
| A. | Directly proportional to the angle of deflection of moving system |
| B. | Directly proportional to the sine of angle of deflection of moving system |
| C. | Inversely proportional to the angle of deflection of moving system |
| D. | Directly proportional to the square of the angle of deflection of moving system |
| Answer» B. Directly proportional to the sine of angle of deflection of moving system | |
| 43. |
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 / μ 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 | |
| 44. |
The resistances of potential transformer winding is minimized by using |
| A. | Thick conductors and small length of turns |
| B. | Thin conductors and small length of turns |
| C. | Thin conductors and large length of turns |
| D. | Thick conductors and large length of turns |
| Answer» B. Thin conductors and small length of turns | |
| 45. |
The readings of the two wattmeter used for the measurement of power input to a 3 phase induction motor are 850 W and 250 W respectively. The power factor of the motor is |
| A. | 0.73 |
| B. | 0.76 |
| C. | 0.79 |
| D. | 0.85 |
| Answer» B. 0.76 | |
| 46. |
The rate at which fluid flows through a closed pipe can be determined by |
| A. | Determining the mass flow rate |
| B. | Determining the volume flow rate |
| C. | Either (a) or (b) |
| D. | None of these |
| Answer» D. None of these | |
| 47. |
The range of electrostatic voltmeter can be extended by using |
| A. | Resistance potential divider method |
| B. | Capacitance potential divider method |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 48. |
The potential transformers are used to measure large voltage using |
| A. | High range voltmeter |
| B. | Low range voltmeter |
| C. | High range ammeter |
| D. | Low range ammeter |
| Answer» C. High range ammeter | |
| 49. |
The non coincidence between loading and unloading curves is known as |
| A. | Zero drift characteristics |
| B. | Sensitivity drift characteristics |
| C. | Hysteresis |
| D. | Zero drift plus sensitivity drift characteristics |
| Answer» D. Zero drift plus sensitivity drift characteristics | |
| 50. |
The moving system in the indicating instruments is subjected to |
| A. | Deflecting torque |
| B. | Controlling torque |
| C. | Damping torque |
| D. | All the above |
| E. | None of the above |
| Answer» E. None of the above | |