MCQOPTIONS
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MCQOPTIONS
This section includes 180 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.
| 51. |
If a charged rod is brought closer to a gas filled balloon then______________? |
| A. | Radius decreases |
| B. | Balloon bursts |
| C. | Radius increase |
| D. | Balloon squeezes |
| Answer» D. Balloon squeezes | |
| 52. |
Electric intensity being a vector quantity always points_______________? |
| A. | along the direction of force experienced by a unit positive charge |
| B. | opposite to the direction of force experienced by a unit positive charge |
| C. | perpendicular to the direction of force experienced by a uit positive charge |
| D. | any of above |
| Answer» B. opposite to the direction of force experienced by a unit positive charge | |
| 53. |
A closed surface contains two equal and opposite charges. The net electric flux from the surface will be________________? |
| A. | negative |
| B. | positive |
| C. | zero |
| D. | data is insufficient |
| Answer» D. data is insufficient | |
| 54. |
An electric charge at rest produces_______________? |
| A. | only a magnetic field |
| B. | only an electric field |
| C. | neither electric field nor magnetic field |
| D. | both electric and magnetic fields |
| Answer» C. neither electric field nor magnetic field | |
| 55. |
The absolute permittivity of free space is given by_____________? |
| A. | 8.854 x 1(T9 F/m) |
| B. | 8.854 x 1(T10 F/m) |
| C. | 8.854 x KT11 F/m |
| D. | 8.854 x 10″12 F/m |
| Answer» C. 8.854 x KT11 F/m | |
| 56. |
The value of the capacitance depends upon the________________? |
| A. | voltage applied |
| B. | thickness of the capacitor plates |
| C. | geometry of the capacitor |
| D. | dinsity of the capacitor plates |
| Answer» D. dinsity of the capacitor plates | |
| 57. |
Electric intensity at any point in an electric field is equal to the at that point? |
| A. | electric flux |
| B. | magnetic flux density |
| C. | potential gradient |
| D. | none of the above |
| Answer» D. none of the above | |
| 58. |
Dielectric strength of a medium is usually expressed in____________? |
| A. | J/mm |
| B. | C/m2 |
| C. | kV/mm |
| D. | N/mm |
| Answer» D. N/mm | |
| 59. |
To prevent the generation of static charges on rubber or flat leather__________? |
| A. | surface is moistened |
| B. | conductive dressing is done |
| C. | oil compound dressing is done |
| D. | talcum powder is sprayed on the surface |
| Answer» C. oil compound dressing is done | |
| 60. |
A gang condenser is a____________? |
| A. | polarised capacitor |
| B. | variable capacitor |
| C. | ceramic capacitor |
| D. | none of the above |
| Answer» C. ceramic capacitor | |
| 61. |
The time constant and R-C circuit may also be defined as the time during which the charging current falls to ________ percent of its initial maximum value |
| A. | 37 |
| B. | 42 |
| C. | 63 |
| D. | 73 |
| Answer» B. 42 | |
| 62. |
The unit of capacitance is__________? |
| A. | henry |
| B. | ohm |
| C. | farad |
| D. | farad/m |
| Answer» D. farad/m | |
| 63. |
Air capacitors are generally available in the range_________? |
| A. | 10 to 400 pF |
| B. | 1 to 20 pF |
| C. | 100 to 900 pF |
| D. | 20 to 100 pF |
| Answer» B. 1 to 20 pF | |
| 64. |
A capacitor charged to 200 V has 2000 (iC of charge. The value of capacitance will be_____________? |
| A. | 10 F |
| B. | 10 uF |
| C. | 100 nF |
| D. | 1000 uF |
| Answer» C. 100 nF | |
| 65. |
Paper capacitors usually have a tolerance of___________? |
| A. | ± 5% |
| B. | ± 10% |
| C. | ± 15% |
| D. | ± 20% |
| Answer» C. ± 15% | |
| 66. |
A condenser suitable for D.C. only is________? |
| A. | metallic plate variable gang condenser |
| B. | metallic paper capacitor |
| C. | oil impregrated paper condenser |
| D. | poled aluminium electrolytic condenser |
| Answer» E. | |
| 67. |
A single core cable used on 33000 V has conductor diameter 10 mm and the internal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is____________? |
| A. | 62 x 105 V/m |
| B. | 72 x 105 V/m |
| C. | 82 x 105 V/m |
| D. | 92 x 105 V/m |
| Answer» C. 82 x 105 V/m | |
| 68. |
at a point may be defined as equal to the lines of force passing normally through a unit cross section at that point ? |
| A. | Electric intensity |
| B. | Magnetic flux density |
| C. | Electric flux |
| D. | None of the above |
| Answer» B. Magnetic flux density | |
| 69. |
An electrolytic capacitor is generally made to provide__________? |
| A. | low capacitance |
| B. | fixed capacitance |
| C. | variable capacitance |
| D. | large value of capacitance |
| Answer» E. | |
| 70. |
capacitors are used for audio frequency and radio frequency coupling and tuning ? |
| A. | Air |
| B. | Mica |
| C. | Plastic film |
| D. | Ceramic |
| Answer» C. Plastic film | |
| 71. |
A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be________________? |
| A. | 5 times smaller than before |
| B. | 5 times greater than before |
| C. | 10 times greater than before |
| D. | 25 times larger than before |
| Answer» E. | |
| 72. |
Which is the most superior dielectric out of the following ? |
| A. | Air |
| B. | Glass |
| C. | Bakelite |
| D. | Paper |
| Answer» D. Paper | |
| 73. |
Permittivity is expressed in_____________? |
| A. | Farad/sq-m |
| B. | Farad/meter |
| C. | Weber/meter |
| D. | Weber/sq-m |
| Answer» C. Weber/meter | |
| 74. |
When a dielectric is placed in an electric field the field strength____________? |
| A. | decreases |
| B. | increases |
| C. | reduces to zero |
| D. | remain unchanged |
| Answer» B. increases | |
| 75. |
Which of the following capacitor is preferred in case of single phase motor ? |
| A. | Mica capacitor |
| B. | Paper capacitor |
| C. | Electrolytic capacitor |
| D. | Ceramic capacitor |
| Answer» D. Ceramic capacitor | |
| 76. |
If a third equal and similar charge is placed between two equal and similar charges, then this third charge will_____________? |
| A. | move out of the field of influence of the two charges |
| B. | remain in stable equilibrium |
| C. | not be in equilibrium |
| D. | be in unstable equilibrium |
| Answer» C. not be in equilibrium | |
| 77. |
Dielectric strength of a material depends on_____________? |
| A. | moisture content |
| B. | temperature |
| C. | thickness |
| D. | all of the above |
| E. | none of the above |
| Answer» E. none of the above | |
| 78. |
Acharge which when placed in vacuum from an equal and similar charge repels with a force of 9 x 10 N, is known as_____________? |
| A. | milli-coulomb |
| B. | micro-coulomb |
| C. | pico-coulomb |
| D. | coulomb |
| Answer» C. pico-coulomb | |
| 79. |
If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is___________? |
| A. | charged |
| B. | short-circuited |
| C. | lossy |
| D. | satisfactory |
| Answer» C. lossy | |
| 80. |
Which medium has the least dielectric strength ____________? |
| A. | Paraffin wax |
| B. | Quartz |
| C. | Glass |
| D. | Air |
| Answer» E. | |
| 81. |
In a cable capacitor, voltage gradient is maximum at the surface of the______________? |
| A. | earth |
| B. | conduction |
| C. | sheath |
| D. | insulator |
| Answer» C. sheath | |
| 82. |
A capacitance of 100 fiF is connected in series with a resistance of 8000 £2. The time constant of the circuit is______________? |
| A. | 0.2 s |
| B. | 0.4 s |
| C. | 0.6 s |
| D. | 0.8 s |
| Answer» E. | |
| 83. |
1 volt/meter is same as___________? |
| A. | 1 meter/coulomb |
| B. | 1 newton meter |
| C. | 1 newton/meter |
| D. | 1 joule/coulomb |
| Answer» D. 1 joule/coulomb | |
| 84. |
The property of a capacitor to store electricity is called its____________? |
| A. | capacitance |
| B. | charge |
| C. | energy |
| D. | none of the above |
| Answer» B. charge | |
| 85. |
The relative permittivity has the following units__________? |
| A. | F/m |
| B. | m/F |
| C. | Wb/m |
| D. | no units |
| Answer» D. no units | |
| 86. |
The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to _________ percent of its value |
| A. | 37, initial |
| B. | 62, initial |
| C. | 62, final |
| D. | 37, final |
| Answer» D. 37, final | |
| 87. |
Paper condenser is___________? |
| A. | always polarised |
| B. | usually of fixed value |
| C. | electrolytic condenser |
| D. | a variable condenser |
| Answer» C. electrolytic condenser | |
| 88. |
A unit tube of flux is known as tube___________? |
| A. | Newton |
| B. | Faraday |
| C. | Michale |
| D. | None of the above |
| Answer» C. Michale | |
| 89. |
For closer tolerances which of the following capacitors is usually preferred ? |
| A. | Paper capacitor |
| B. | Mica capacitor |
| C. | Ceramic disc capacitor |
| D. | None of the above |
| Answer» C. Ceramic disc capacitor | |
| 90. |
When the dielectric is homogeneous,the potential gradient is_____________? |
| A. | uniform |
| B. | non-uniform |
| C. | zero |
| D. | any of the above |
| Answer» B. non-uniform | |
| 91. |
If a 6 uF capacitor is charged to 200 V, the charge in coulombs will be____________? |
| A. | 800 uC |
| B. | 900 uC |
| C. | 1200 uC |
| D. | 1600 uC |
| Answer» D. 1600 uC | |
| 92. |
capacitors are used in transistor circuits? |
| A. | Ceramic |
| B. | Paper |
| C. | Air |
| D. | Electrolytic |
| Answer» B. Paper | |
| 93. |
The potential gradient across the material of low permittivity is than across the material of high permittivity? |
| A. | smaller |
| B. | greater |
| C. | both (A) and (B) |
| D. | none of the above |
| Answer» C. both (A) and (B) | |
| 94. |
The inverse of capacitance is called_______________? |
| A. | reluctance |
| B. | conductance |
| C. | susceptance |
| D. | elastance |
| Answer» E. | |
| 95. |
When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of_____________? |
| A. | 2 joules |
| B. | 4 joules |
| C. | 6 joules |
| D. | 8 joules |
| Answer» E. | |
| 96. |
The total deficiency or excess of electrons in a body is known as____________? |
| A. | current |
| B. | voltage |
| C. | potential gradient |
| D. | charge |
| Answer» E. | |
| 97. |
Dielectric constant for mica is nearly_____________? |
| A. | 200 |
| B. | 100 |
| C. | 3 to 8 |
| D. | 1 to 2 |
| Answer» D. 1 to 2 | |
| 98. |
Which of the following material has least value of dielectric constant ? |
| A. | Ceramics |
| B. | Oil |
| C. | Glass |
| D. | Paper |
| Answer» C. Glass | |
| 99. |
The value of dielectric constant for vacuum is taken as____________? |
| A. | zero |
| B. | 1 |
| C. | 4 |
| D. | 10 |
| Answer» C. 4 | |
| 100. |
Which of the following statements is incorrect ? |
| A. | The thinner the dielectric, the more the capacitance and the lower the voltage breakdown rating for a capacitor |
| B. | A six dot mica capacitor colour coded white, green, black, red and yellow has the capacitance value of 500 pF |
| C. | Capacitors in series provide less capacitance but a higher voltage breakdown rating for the combination |
| D. | A capacitor can store charge because it has a dielectric between two conductors |
| Answer» C. Capacitors in series provide less capacitance but a higher voltage breakdown rating for the combination | |