MCQOPTIONS
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MCQOPTIONS
This section includes 150 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. |
Yoke in a dc machine serves the function of |
| A. | Providing mechanical support to the poles |
| B. | Protects the dc machine from harmful atmospheric elements like dust, moisture and gases |
| C. | Offers a path of low reluctances to the magnetic flux produced by the poles |
| D. | All of these |
| Answer» E. | |
| 2. |
Which among the following sentences is correct? |
| A. | Lenz’s law is used to find the direction of induced current |
| B. | Fleming’s right hand rule is used to find the direction of induced current |
| C. | Fleming’s left hand rule is used to find the direction of force |
| D. | All of these |
| Answer» E. | |
| 3. |
Which among the following is true about ohm’s law? |
| A. | I ∝ V |
| B. | I = V/R |
| C. | V = IR |
| D. | All of these |
| Answer» E. | |
| 4. |
When windings of 3 - phase induction motor is rotated in a magnetic field, then the emf induced in each phase are of |
| A. | Same magnitude but different frequency |
| B. | Different magnitude but same frequency |
| C. | Same magnitude and same frequency |
| D. | Different magnitude and different frequency |
| Answer» D. Different magnitude and different frequency | |
| 5. |
When the motor runs on no load, then |
| A. | Back emf is almost equal to applied voltage |
| B. | Back emf will be greater than applied voltage |
| C. | Back emf will be less than applied voltage |
| D. | None of these |
| Answer» B. Back emf will be greater than applied voltage | |
| 6. |
When the flux crosses the air gap, it bulges outward at the ends of the air gap and the flux density in the air gap is reduced. This is known as |
| A. | Leakage flux |
| B. | Fringing |
| C. | Relative permeability |
| D. | Magnetizing force |
| Answer» C. Relative permeability | |
| 7. |
When an ac power is applied to a reactive load, then the voltage is |
| A. | In phase with the current |
| B. | 90 degree out of phase with the current |
| C. | 180 degree out of phase with the current |
| D. | 270 degree out of phase with the current |
| Answer» C. 180 degree out of phase with the current | |
| 8. |
When a solenoid attracts an iron bar, |
| A. | They leave the south pole to go around to the north pole |
| B. | They leave the north pole to go around to the south pole |
| C. | They leave the north pole to go to infinity |
| D. | They leave the south pole to go to the infinity |
| Answer» C. They leave the north pole to go to infinity | |
| 9. |
Wattmeter is a / an |
| A. | Indicating instrument |
| B. | Integrating instrument |
| C. | Recording instrument |
| D. | All of these |
| Answer» B. Integrating instrument | |
| 10. |
Valence electrons of silicon and germanium are |
| A. | 2, 4 |
| B. | 4, 4 |
| C. | 4, 2 |
| D. | 2, 2 |
| Answer» C. 4, 2 | |
| 11. |
“ Total electric flux through any closed surface is equal to the charge enclosed by that surface ”. This is |
| A. | Lenz’s law |
| B. | Gauss’s law |
| C. | Maxwell’s law |
| D. | Faraday’s law |
| Answer» C. Maxwell’s law | |
| 12. |
To move electrons from valence band to conduction band, the energy applied to the insulator is |
| A. | Less than 15 eV |
| B. | Equal to 15 eV |
| C. | More than 15 eV |
| D. | More than 25 eV |
| Answer» D. More than 25 eV | |
| 13. |
Three - phase induction motor is more suitable than single - phase because |
| A. | It is self starting |
| B. | Better efficiency compared to single - phase |
| C. | Better power factor compared to single - phase |
| D. | All of these |
| Answer» E. | |
| 14. |
The wrong statement among the following is |
| A. | A fuse can be fitted in an outlet socket |
| B. | A fuse should not get overheated |
| C. | The current rating of fuse should not exceed the rating of the smallest cable protected |
| D. | Fuse having rating less than 3 A can be used in radio |
| Answer» B. A fuse should not get overheated | |
| 15. |
The voltage of the earthed appliance when it is higher and when it is lower than the earth potential will |
| A. | Fall to zero, fall to zero |
| B. | Fall to zero, increase to zero |
| C. | Increase to zero, increase to zero |
| D. | Increase to zero, fall to zero |
| Answer» C. Increase to zero, increase to zero | |
| 16. |
The unit of magnetizing field intensity is |
| A. | Newton / Weber |
| B. | Ampere - turns / Weber |
| C. | Newton - m / Weber |
| D. | Only (a) and (b) |
| Answer» E. | |
| 17. |
The unit of electrical energy is / are |
| A. | Joules |
| B. | Watt - sec |
| C. | Kilowatt - hour |
| D. | All of these |
| Answer» E. | |
| 18. |
The undue deterioration in wiring due to the action of dampness, fumes, weather etc is |
| A. | Appearance |
| B. | Permanence |
| C. | Mechanical immunity |
| D. | Earthing |
| Answer» C. Mechanical immunity | |
| 19. |
The two wattmeter method is applicable for |
| A. | Only star connected system |
| B. | Only delta connected system |
| C. | Both star connected and delta connected system |
| D. | None of these |
| Answer» D. None of these | |
| 20. |
The two alternating quantities could be added by constructing |
| A. | Squares |
| B. | Parallelograms |
| C. | Rhombus |
| D. | Trapeziums |
| Answer» C. Rhombus | |
| 21. |
The tube of a tube light is filled with |
| A. | Fluorescent paste |
| B. | Low pressure inert gas |
| C. | Mercury |
| D. | Only (b) and (c) |
| Answer» E. | |
| 22. |
The synchronous generator is also called an |
| A. | AC generator |
| B. | Alternator |
| C. | DC generator |
| D. | Only (a) and (b) |
| Answer» E. | |
| 23. |
The steel used for laminations should have |
| A. | High permeability and high hysteresis |
| B. | High permeability and low hysteresis |
| C. | Low permeability and hysteresis |
| D. | Low permeability and high hysteresis |
| Answer» C. Low permeability and hysteresis | |
| 24. |
The springs should be |
| A. | Free from mechanical stress |
| B. | They should have a small resistance |
| C. | Sufficient cross-sectional area |
| D. | All of these |
| Answer» E. | |
| 25. |
The resultant flux in an induction motor is equal to the |
| A. | Maximum value of flux due to any phase |
| B. | Twice of the maximum value of flux due to any phase |
| C. | 0.5 times the maximum value of flux due to any phase |
| D. | 1.5 times the maximum value of flux due to any phase |
| Answer» E. | |
| 26. |
The ratio of maximum value to effective value of an alternating quantity is called |
| A. | Crest factor |
| B. | Peak factor |
| C. | Amplitude factor |
| D. | All of these |
| Answer» E. | |
| 27. |
The product of rms values of current and voltage is called as |
| A. | Real power |
| B. | Apparent power |
| C. | Reactive power |
| D. | Polar curves |
| Answer» C. Reactive power | |
| 28. |
The power curve for a purely resistive circuit is zero only when |
| A. | Current is zero |
| B. | Voltage is zero |
| C. | Both current and voltage is zero |
| D. | None of these |
| Answer» D. None of these | |
| 29. |
The power absorbed by a pure inductive circuit and pure capacitive circuit is |
| A. | Zero and non zero |
| B. | Non zero and zero |
| C. | Non zero and non zero |
| D. | Zero and zero |
| Answer» E. | |
| 30. |
The potential difference between two points is given by |
| A. | V = E / Q |
| B. | V = W / Q |
| C. | V = Q / E |
| D. | V = Q / W |
| Answer» C. V = Q / E | |
| 31. |
The positive plates of nickel iron cell is made up of |
| A. | Nickel hydroxide |
| B. | Lead peroxide |
| C. | Ferrous hydroxide |
| D. | Potassium hydroxide |
| Answer» B. Lead peroxide | |
| 32. |
The P - type semiconductor impurities are also called as |
| A. | Acceptor impurities |
| B. | Donor impurities |
| C. | Either (a) or (b) |
| D. | None of these |
| Answer» B. Donor impurities | |
| 33. |
The overload release protects the motor against |
| A. | Over voltage |
| B. | Over current |
| C. | Over load |
| D. | All of these |
| Answer» D. All of these | |
| 34. |
The number of instantaneous values between zero and the peak value is |
| A. | Zero |
| B. | One |
| C. | Eleven |
| D. | Infinity |
| Answer» E. | |
| 35. |
The number of cycles of the induced emf per second is equal to |
| A. | No. of cycles per revolutions x no. of revolutions per second |
| B. | No. of cycles per second x no. of revolutions per second |
| C. | No. of cycles per revolutions x no. of revolutions per hour |
| D. | No. of cycles per revolutions / no. of revolutions per second |
| Answer» B. No. of cycles per second x no. of revolutions per second | |
| 36. |
The number of conductors in synchronous generators is equal to |
| A. | The number of turns per phase |
| B. | Twice the number of coils per phase |
| C. | Half of the number of coils per phase |
| D. | None of these |
| Answer» C. Half of the number of coils per phase | |
| 37. |
The non salient pole type synchronous generator is driven by |
| A. | Hydraulic turbines |
| B. | Diesel engines |
| C. | Steam engines |
| D. | All of these |
| Answer» D. All of these | |
| 38. |
The net power in a series R-C circuit is |
| A. | Zero |
| B. | Positive |
| C. | Negative |
| D. | None of these |
| Answer» C. Negative | |
| 39. |
The moving system of induction type single - phase energy meter consists of |
| A. | One pointer and two control spring |
| B. | One pointer and one control spring |
| C. | Two pointer and two control spring |
| D. | No pointer and no control spring |
| Answer» E. | |
| 40. |
The most effective earth plate is |
| A. | Copper plates |
| B. | Cast - iron plates |
| C. | Galvanized iron plates |
| D. | All of these |
| Answer» B. Cast - iron plates | |
| 41. |
The most common waveforms of ac is |
| A. | Square |
| B. | Triangular |
| C. | Sinusoidal |
| D. | Saw tooth |
| Answer» D. Saw tooth | |
| 42. |
The materials with permeability less than unity are called |
| A. | Diamagnetic materials |
| B. | Paramagnetic materials |
| C. | Ferromagnetic materials |
| D. | Anti ferromagnetic materials |
| Answer» B. Paramagnetic materials | |
| 43. |
The magnetic materials which are strongly attracted by the magnet is |
| A. | Diamagnetic materials |
| B. | Paramagnetic materials |
| C. | Ferromagnetic materials |
| D. | Anti ferromagnetic materials |
| Answer» B. Paramagnetic materials | |
| 44. |
The magnetic effect is used in |
| A. | Moving iron attraction type instrument |
| B. | Moving iron repulsion type instrument |
| C. | Electrostatic ammeters and voltmeters |
| D. | All of these |
| Answer» E. | |
| 45. |
The induced emf sets up the direction of current in such a way that the magnetic field produced by it |
| A. | Supports the cause producing it |
| B. | Opposes the cause producing it |
| C. | Increases |
| D. | Decreases |
| Answer» C. Increases | |
| 46. |
The handle of iron box is made up of |
| A. | Bakelite |
| B. | Ebonite |
| C. | Chromium |
| D. | Only (a) and (b) |
| Answer» E. | |
| 47. |
The fusing current of a fuse depends on its |
| A. | Material and its length |
| B. | Length and its diameter |
| C. | Material and diameter |
| D. | Material, length and diameter |
| Answer» E. | |
| 48. |
The frequency of the induced emf in an induction motor is |
| A. | Greater than the supply frequency |
| B. | Lesser than the supply frequency |
| C. | Same as the supply frequency |
| D. | None of these |
| Answer» D. None of these | |
| 49. |
The frequency of rotor current in an induction motor is |
| A. | slip times the frequency of stator current |
| B. | slip times the frequency of supply |
| C. | One by slip times the frequency of stator current |
| D. | One by slip times the frequency of supply |
| Answer» C. One by slip times the frequency of stator current | |
| 50. |
The field winding of dc series motor consists of few turns of |
| A. | Thin wire with low resistance |
| B. | Thick wire with low resistance |
| C. | Thin wire with high resistance |
| D. | Thick wire with high resistance |
| Answer» C. Thin wire with high resistance | |