MCQOPTIONS
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MCQOPTIONS
This section includes 144 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. |
_____ instruments are those which measure the total quantity of electricity delivered in a particular time. |
| A. | Absolute |
| B. | Indicating |
| C. | Recording |
| D. | Integrating |
| Answer» E. | |
| 2. |
The use of _____ instruments is merely confined within laboratories as stand ardizing instruments. |
| A. | absolute |
| B. | indicating |
| C. | recording |
| D. | integrating |
| Answer» B. indicating | |
| 3. |
Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ? |
| A. | Absolute instruments |
| B. | Indicating instruments |
| C. | Recording instruments |
| D. | Integrating instruments |
| Answer» C. Recording instruments | |
| 4. |
A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly |
| A. | deflecting |
| B. | controlling |
| C. | damping |
| D. | any of the above |
| Answer» D. any of the above | |
| 5. |
A moving-coil permanent-magnet instrument can be used as _____ by using a low resistance shunt. |
| A. | ammeter |
| B. | voltmeter |
| C. | flux-meter |
| D. | ballistic galvanometer |
| Answer» B. voltmeter | |
| 6. |
Most common form of A.C. meters met with in every day domestic and industrial installations are |
| A. | mercury motor meters |
| B. | commutator motor meters |
| C. | induction type single phase energy meters |
| D. | all of the above |
| Answer» D. all of the above | |
| 7. |
is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another, |
| A. | Tangent galvanometer |
| B. | Meggar |
| C. | Current transformer |
| D. | None of the above |
| Answer» C. Current transformer | |
| 8. |
The ratio of maximum displacement deviation to full scale deviation of the instrument is called |
| A. | static sensitivity |
| B. | dynamic deviation |
| C. | linearity |
| D. | precision or accuracy |
| Answer» D. precision or accuracy | |
| 9. |
In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of |
| A. | 0.1 Hz |
| B. | 0.25 Hz |
| C. | 0.5 Hz |
| D. | 1.5 Hz |
| Answer» D. 1.5 Hz | |
| 10. |
In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be |
| A. | out of phase by 90 |
| B. | out of phase by 60 |
| C. | out of phase by 30 |
| D. | out of phase by 0 |
| Answer» B. out of phase by 60 | |
| 11. |
The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a |
| A. | single-phase winding |
| B. | two-phase winding |
| C. | three-phase winding |
| D. | any of the above |
| Answer» C. three-phase winding | |
| 12. |
In a single phase power factor meter the phase difference between the currents in the two pressure coils is |
| A. | exactly 0 |
| B. | approximately 0 |
| C. | exactly 90 |
| D. | approximately 90 |
| Answer» D. approximately 90 | |
| 13. |
In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was |
| A. | unity |
| B. | 0.8 lagging |
| C. | 0.8 leading |
| D. | zero |
| Answer» B. 0.8 lagging | |
| 14. |
To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken |
| A. | from a source which is not the same as the unknown voltage |
| B. | from a battery |
| C. | from the same source as the unknown voltage |
| D. | any of the above |
| Answer» D. any of the above | |
| 15. |
When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is |
| A. | short-circuited |
| B. | all right |
| C. | faulty |
| D. | none |
| Answer» C. faulty | |
| 16. |
Which of the following devices should be used for accurate measurement of low D.C. voltage ? |
| A. | Small range moving coil voltmeter |
| B. | D.C. potentiometer |
| C. | Small range thermocouple voltmeter |
| D. | None of the above |
| Answer» C. Small range thermocouple voltmeter | |
| 17. |
The pressure coil of a wattmeter should be connected on the supply side of the current coil when |
| A. | load impedance is high |
| B. | load impedance is low |
| C. | supply voltage is low |
| D. | none of the above |
| Answer» B. load impedance is low | |
| 18. |
In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be |
| A. | unity |
| B. | 0.5 |
| C. | 0.3 |
| D. | zero |
| Answer» C. 0.3 | |
| 19. |
Which of the following instruments indicate the instantaneous value of the electrical quantitybeing measured at the time at which it is being measured ? |
| A. | Absolute instruments |
| B. | Indicating instruments |
| C. | Recording instruments |
| D. | Integrating instruments |
| Answer» C. Recording instruments | |
| 20. |
In a single phase power factor meter the phase difference between the currents in the twopressure coils is |
| A. | exactly 0° |
| B. | approximately 0° |
| C. | exactly 90° |
| D. | approximately 90° |
| Answer» D. approximately 90° | |
| 21. |
For measurements on high voltage capacitors, the suitable bridge is |
| A. | Wein bridge |
| B. | Modified De Santy's bridge |
| C. | Schering bridge |
| D. | Any of the above |
| Answer» D. Any of the above | |
| 22. |
In an AC. co-ordinate potentiometer, the currents in the phase and quadraturepotentiometer are adjusted to be |
| A. | out of phase by 90° |
| B. | out of phase by 60° |
| C. | out of phase by 30° |
| D. | out of phase by 0° |
| Answer» B. out of phase by 60° | |
| 23. |
The ratio of maximum displacement deviation to full scale deviation of the instrument iscalled |
| A. | static sensitivity |
| B. | dynamic deviation |
| C. | linearity |
| D. | precision or accuracy |
| Answer» D. precision or accuracy | |
| 24. |
To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supplyfor the potentiometer in taken |
| A. | from a source which is not the same as the unknown voltage |
| B. | from a battery |
| C. | from the same source as the unknown voltage |
| D. | any of the above |
| Answer» D. any of the above | |
| 25. |
In a 3-phase power measurement by two wattmeter method, both the watt meters hadidentical readings. The power factor of the load was |
| A. | unity |
| B. | 0.8 lagging |
| C. | 0.8 leading |
| D. | zero |
| Answer» B. 0.8 lagging | |
| 26. |
Two holes in the disc of energymeter are drilled at the opposite sides of the spindle to |
| A. | improve its ventilation |
| B. | eliminate creeping at no load |
| C. | increase its deflecting torque |
| D. | increase its braking tcrque |
| Answer» C. increase its deflecting torque | |
| 27. |
Which of the following devices should be used for accurate measurement of low D.C.voltage ? |
| A. | Small range moving coil voltmeter |
| B. | D.C. potentiometer |
| C. | Small range thermocouple voltmeter |
| D. | None of the above |
| Answer» C. Small range thermocouple voltmeter | |
| 28. |
A moving-coil permanent-magnet instrument can be used as _____ by using a lowresistance shunt. |
| A. | ammeter |
| B. | voltmeter |
| C. | flux-meter |
| D. | ballistic galvanometer |
| Answer» B. voltmeter | |
| 29. |
In a 3-phase power measurement by two wattmeter method the reading of one of thewattmeter was zero. The power factor of the load must be |
| A. | unity |
| B. | 0.5 |
| C. | 0.3 |
| D. | zero |
| Answer» C. 0.3 | |
| 30. |
is an instrument which measures the insulation resistance of an electric circuit relative toearth and one another, |
| A. | Tangent galvanometer |
| B. | Meggar |
| C. | Current transformer |
| D. | None of the above |
| Answer» C. Current transformer | |
| 31. |
In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have adifference of |
| A. | 0.1 Hz |
| B. | 0.25 Hz |
| C. | 0.5 Hz |
| D. | 1.5 Hz |
| Answer» D. 1.5 Hz | |
| 32. |
The use of _____ instruments is merely confined within laboratories as stand¬ardizinginstruments. |
| A. | absolute |
| B. | indicating |
| C. | recording |
| D. | integrating |
| Answer» B. indicating | |
| 33. |
The stator of phase shifting transformer for use in conjunction with an A.C. potentiometerusually has a |
| A. | single-phase winding |
| B. | two-phase winding |
| C. | three-phase winding |
| D. | any of the above |
| Answer» C. three-phase winding | |
| 34. |
The pressure coil of a wattmeter should be connected on the supply side of the current coilwhen |
| A. | load impedance is high |
| B. | load impedance is low |
| C. | supply voltage is low |
| D. | none of the above |
| Answer» B. load impedance is low | |
| 35. |
A _____ device prevents the oscillation of the moving system and enables the latter toreach its final position quickly |
| A. | deflecting |
| B. | controlling |
| C. | damping |
| D. | any of the above |
| Answer» D. any of the above | |
| 36. |
Most common form of A.C. meters met with in every day domestic and industrialinstallations are |
| A. | mercury motor meters |
| B. | commutator motor meters |
| C. | induction type single phase energy meters |
| D. | all of the above |
| Answer» D. all of the above | |
| 37. |
When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a lowresistance initially and then slowly came to infinity position. This shows that capacitor is |
| A. | short-circuited |
| B. | all right |
| C. | faulty |
| D. | none |
| Answer» C. faulty | |
| 38. |
_____ instruments are those which measure the total quantity of electricity delivered in aparticular time. |
| A. | Absolute |
| B. | Indicating |
| C. | Recording |
| D. | Integrating |
| Answer» E. | |
| 39. |
For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging |
| A. | One of the wattmeters will read zero |
| B. | Both give the same readings |
| C. | One of the wattmeter connections will have to be reversed |
| D. | Pressure coil of the wattmeter will become ineffective. |
| Answer» D. Pressure coil of the wattmeter will become ineffective. | |
| 40. |
The absolute measurement of resistance is done by |
| A. | Ohm’s law method |
| B. | Bridge Method |
| C. | Rayleigh method |
| D. | Lorenz method |
| Answer» E. | |
| 41. |
No eddy current and hysteresis losses occur in |
| A. | Electrostatic instruments |
| B. | PMMC instruments |
| C. | Moving iron instruments |
| D. | Electrodynamo meter instruments |
| Answer» B. PMMC instruments | |
| 42. |
In a gravity controlled instrument, the deflection angle is proportional |
| A. | Measurand |
| B. | Square of the measurand |
| C. | Sine inverse of measurand |
| D. | Sine of the measurand |
| Answer» D. Sine of the measurand | |
| 43. |
The resistance offered to the passage of an in-varying current by a column of mercury at the temperature of melting ice of mass 14.4521 gms of uniform cross-sectional area and length 106.3cm is |
| A. | Standard ohm |
| B. | One international ohm |
| C. | One ohm according to SI units |
| D. | One ohm according to working standards |
| Answer» C. One ohm according to SI units | |
| 44. |
The repeat accuracy of an instrument can be judged from its |
| A. | Static error |
| B. | Linearity error |
| C. | Dynamic error |
| D. | Standard deviation of error |
| Answer» E. | |
| 45. |
The multiplier and the meter coil in a voltmeter are in |
| A. | Series |
| B. | Parallel |
| C. | Series-parallel |
| D. | None of the above |
| Answer» B. Parallel | |
| 46. |
Wagner earthing device is used to eliminate errors due to |
| A. | Electrostatic coupling |
| B. | Electromagnetic coupling |
| C. | Both A and B |
| D. | None of the above |
| Answer» B. Electromagnetic coupling | |
| 47. |
A mulliammeter can be used as |
| A. | Voltmeter and ammeter |
| B. | Wattmeter |
| C. | Ohmmeter |
| D. | Frequency meter |
| Answer» B. Wattmeter | |
| 48. |
It is found that 10A current passes through a resistor of 10°hms. The resistor has 5% tolerance . The error in measurement of current can be as high as 5%. What is max error in measurement of power, calculated from measured value of I and the nominal value of resistor? |
| A. | 100W |
| B. | 150W |
| C. | 50W |
| D. | 200W |
| Answer» C. 50W | |
| 49. |
A resistor of 10kΩhms with 5% tolerance is connected in parallel with a 5kΩhms resistor of 10% tolerance. What is the tolerance limit for the parallel network? |
| A. | 5% |
| B. | 6.67% |
| C. | 10% |
| D. | 8.33% |
| Answer» E. | |
| 50. |
The pressure coil of a wattmeter should be connected on the supply side of the current coil when |
| A. | Load impedance is high |
| B. | Load impedance is low |
| C. | Supply voltage is low |
| D. | None of the above |
| Answer» B. Load impedance is low | |