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.
| 101. |
Impurities are generally added in the pure semiconductor to |
| A. | increase the number of electrons |
| B. | increase the number of holes |
| C. | increase their conductivity |
| D. | all of these |
| Answer» D. all of these | |
| 102. |
If two conductors carrying currents in opposite direction are placed parallel to each other then the magnetic field set up by the conductors |
| A. | Attract each other |
| B. | Repels each other |
| C. | Perpendicular to each other |
| D. | Parallel to each other |
| Answer» C. Perpendicular to each other | |
| 103. |
If the voltage increases from zero to peak value and decreases back to zero during one alteration, then the average value must be |
| A. | Less than zero |
| B. | Greater than peak value |
| C. | Between zero to peak value |
| D. | None of these |
| Answer» D. None of these | |
| 104. |
If the transformer is loaded then the secondary terminal voltage falls for and rises for |
| A. | Lagging power factor, leading power factor |
| B. | Lagging power factor, unity power factor |
| C. | Unity power factor, lagging power factor |
| D. | Leading power factor, lagging power factor |
| Answer» B. Lagging power factor, unity power factor | |
| 105. |
If the number of turns, area and current of an ac circuit is doubled then the new inductance will be |
| A. | Equal to the former |
| B. | Twice of the former |
| C. | Four times the former |
| D. | Half of the former |
| Answer» D. Half of the former | |
| 106. |
If the number of conductors and speed of a lap wound generator is doubled then the generated emf will be |
| A. | Remains same |
| B. | Twice of the former |
| C. | Four times of former emf |
| D. | Half of the former emf |
| Answer» D. Half of the former emf | |
| 107. |
If the magnetic field is stationary and the conductor is in motion then the emf induced is called |
| A. | Dynamically induced emf |
| B. | Statically induced emf |
| C. | Self induced emf |
| D. | Mutually induced emf |
| Answer» B. Statically induced emf | |
| 108. |
If the length of the filament is increased then the |
| A. | Power also increases |
| B. | Power decreases |
| C. | Required oxygen increases |
| D. | Flow of current increases |
| Answer» B. Power decreases | |
| 109. |
If the armature current of dc series motor has become twice then the torque will become |
| A. | Twice of the former |
| B. | Four times of the former |
| C. | One fourth of the former |
| D. | Remains same |
| Answer» C. One fourth of the former | |
| 110. |
If induction motor is direct switched-on then it will develop |
| A. | 1.5 times their full load torque |
| B. | 1.5 to 2.5 times their full load torque |
| C. | 2.5 times their full load torque |
| D. | 1.5 to 5 times their full load torque |
| Answer» C. 2.5 times their full load torque | |
| 111. |
If an induction motor is initially connected in delta and then reconnected in star then the current drawn will become |
| A. | Thrice of the current drawn when connected in delta |
| B. | Twice of the current drawn when connected in delta |
| C. | One third of the current drawn when connected in delta |
| D. | Half of the current drawn when connected in delta |
| Answer» D. Half of the current drawn when connected in delta | |
| 112. |
If an extra resistance is connected in the rotor circuit of slip ring induction motor, then |
| A. | Starting current and torque decreases |
| B. | Starting current increases and torque decreases |
| C. | Starting current decreases and torque increases |
| D. | Starting current and torque increases |
| Answer» D. Starting current and torque increases | |
| 113. |
If an external electric field is applied across the intrinsic semiconductor, then the |
| A. | More number of electron holes pair combination will be broken |
| B. | More number of electron holes pair combination will be evolved |
| C. | Less number of electron holes pair combination will be broken |
| D. | Less number of electron holes pair combination will be evolved |
| Answer» B. More number of electron holes pair combination will be evolved | |
| 114. |
If a number of resistors are connected in parallel, then the reciprocal of total resistance is equal to |
| A. | Sum of individual resistances |
| B. | Sum of the reciprocal of individual resistances |
| C. | Reciprocal of the sum of individual resistances |
| D. | All of these |
| Answer» C. Reciprocal of the sum of individual resistances | |
| 115. |
If a current of 5A flows through a resistor of 12 ohm then the power developed and the energy dissipated in 2 minutes are |
| A. | 300 W, 36000 J |
| B. | 360 W, 30000 J |
| C. | 380 W, 35000 J |
| D. | 380 W, 36000 J |
| Answer» B. 360 W, 30000 J | |
| 116. |
Heating element of electric iron box is an alloy of |
| A. | Copper and nickel |
| B. | Nickel and cobalt |
| C. | Iron and magnesium |
| D. | Nickel and chromium |
| Answer» E. | |
| 117. |
Gauss’s law is applicable for |
| A. | Only point charge |
| B. | Infinite line charge |
| C. | Infinite sheet of charge |
| D. | All of these |
| Answer» E. | |
| 118. |
From full load to no load, the change of terminal voltage is more in case of |
| A. | Lagging power factor |
| B. | Leading power factor |
| C. | Unity power factor |
| D. | Both lagging and leading power factor compared to unity power factor |
| Answer» E. | |
| 119. |
For solving parallel ac circuit, the method used is |
| A. | Vector method |
| B. | Admittance method |
| C. | Symbolic or j - method |
| D. | All of these |
| Answer» E. | |
| 120. |
For induction motors, |
| A. | Should be essentially a constant speed motor |
| B. | Its speed reduces to some extent with increase in load |
| C. | Does not need to be synchronized |
| D. | All of these |
| Answer» E. | |
| 121. |
For improving the soil condition and efficiency of earthing system, the pit area around the G.I. pipe is filled with |
| A. | Mixture of copper and nickel |
| B. | Mixture of chloride and sodium |
| C. | Mixture of aluminium and sulphate |
| D. | Mixture of salt and coal |
| Answer» E. | |
| 122. |
For forming an electric dipole between two point charges separated by a small distance, the two point charges are of |
| A. | Unequal magnitude and opposite sign |
| B. | Unequal magnitude but same sign |
| C. | Equal magnitude and same sign |
| D. | Equal magnitude but opposite sign |
| Answer» E. | |
| 123. |
For extinguishing arc in an high voltage fuses, the element can be immersed in |
| A. | Oil |
| B. | Carbon tetrachloride |
| C. | Carbon tetrafloride |
| D. | Only (a) and (b) |
| Answer» E. | |
| 124. |
For controlling the initial inrush current, |
| A. | Reduced voltage is applied to the stator during the starting period |
| B. | Reduced voltage is applied to the stator when the motor is running at rated speed |
| C. | Either (a) or (b) |
| D. | None of these |
| Answer» B. Reduced voltage is applied to the stator when the motor is running at rated speed | |
| 125. |
For application in electric locomotives or for traction purposes, the most suitable motor is |
| A. | Dc series motor |
| B. | Differentially compounded motor |
| C. | Cumulatively compounded motor |
| D. | None of these |
| Answer» B. Differentially compounded motor | |
| 126. |
For a two - way position control of lamp, the number of switches required is |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» C. Three | |
| 127. |
Filters are used to convert |
| A. | Pulsating dc signal into a pure dc signal |
| B. | Pure dc signal into a pulsating dc signal |
| C. | Pulsating dc signal into a pure ac signal |
| D. | Pulsating ac signal into a pure dc signal |
| Answer» B. Pure dc signal into a pulsating dc signal | |
| 128. |
Electrical work is |
| A. | Directly proportional to the potential difference |
| B. | Directly proportional to the charge |
| C. | Directly proportional to the current |
| D. | All of these |
| Answer» E. | |
| 129. |
Electrical energy can be converted into |
| A. | Light energy |
| B. | Electromagnetic energy |
| C. | Electrochemical energy |
| D. | All of these |
| Answer» E. | |
| 130. |
Electrical appliances which works on the electromagnetic principle is / are |
| A. | Generators |
| B. | Motors |
| C. | Transformers |
| D. | All of these |
| Answer» E. | |
| 131. |
Electric heaters is made up of |
| A. | Chromed iron |
| B. | Brass |
| C. | Steel |
| D. | Both (a) and (b) |
| Answer» E. | |
| 132. |
Electric flux density is a function of |
| A. | Charge |
| B. | Position |
| C. | Medium |
| D. | Only (a) and (b) |
| Answer» E. | |
| 133. |
Electric field intensity is |
| A. | Directly proportional to the force applied |
| B. | Inversely proportional to the force applied |
| C. | Directly proportional to the permittivity |
| D. | Inversely proportional to the charge |
| Answer» B. Inversely proportional to the force applied | |
| 134. |
Electric bell consists of a |
| A. | Horse shoe type electromagnet |
| B. | Circular electromagnet |
| C. | Rod shaped electromagnet |
| D. | All of these |
| Answer» B. Circular electromagnet | |
| 135. |
Efficiency of a transformer is maximum at |
| A. | Leading power factor |
| B. | Lagging power factor |
| C. | Unity power factor |
| D. | None of these |
| Answer» D. None of these | |
| 136. |
Coulomb’s First Law states that |
| A. | Unlike poles attract each other |
| B. | Like poles repel each other |
| C. | Unlike poles attract each other and like poles repel each other |
| D. | The force between two magnetic poles placed in a medium directly proportional to their pole strengths |
| Answer» D. The force between two magnetic poles placed in a medium directly proportional to their pole strengths | |
| 137. |
Copper losses is proportional to |
| A. | kVA |
| B. | square of kVA |
| C. | cube of kVA |
| D. | none of these |
| Answer» C. cube of kVA | |
| 138. |
Copper losses occurs due to ohmic resistance in |
| A. | Primary winding |
| B. | Secondary winding |
| C. | Both primary and secondary winding |
| D. | None of these |
| Answer» D. None of these | |
| 139. |
Commutator motors have |
| A. | Absolutely uniform torque |
| B. | Approximately uniform torque |
| C. | Non - uniform torque |
| D. | None of these |
| Answer» D. None of these | |
| 140. |
By using two wattmeter method, power can be measured in |
| A. | 3 - phase, 2 - wire system |
| B. | 3 - phase, 3 - wire system |
| C. | 3 - phase, 4 - wire system |
| D. | All of these |
| Answer» C. 3 - phase, 4 - wire system | |
| 141. |
Buzzer in principle is a bell |
| A. | with hammer |
| B. | with gong |
| C. | with both hammer and gong |
| D. | without hammer and gong |
| Answer» E. | |
| 142. |
At low temperature, the semi conductor behaves as a |
| A. | Perfect insulator |
| B. | Perfect conductor |
| C. | Perfect consulator |
| D. | None of these |
| Answer» D. None of these | |
| 143. |
Among the following damping method, the most effective and efficient damping is |
| A. | Air friction damping |
| B. | Fluid friction damping |
| C. | Eddy current damping |
| D. | None of these |
| Answer» D. None of these | |
| 144. |
Alternating voltage can be generated by |
| A. | By rotating a coil in a magnetic field |
| B. | By rotating a magnetic field within a stationary coil |
| C. | Either (a) or (b) |
| D. | Neither (a) or (b) |
| Answer» D. Neither (a) or (b) | |
| 145. |
According to the End Rule, the current directions when looked from one end of the coil if that end is South Pole and if the end is North Pole are |
| A. | Both clockwise |
| B. | Anticlockwise, clockwise |
| C. | Clockwise, anticlockwise |
| D. | Both anticlockwise |
| Answer» D. Both anticlockwise | |
| 146. |
According to the couloumb’s second law, the force between two magnetic poles placed in a medium is |
| A. | Directly proportional to their pole strengths. |
| B. | Inversely proportional to the square of the distance between them |
| C. | Inversely proportional to the absolute permeability of the surrounding medium |
| D. | All of these |
| Answer» E. | |
| 147. |
According to the coulomb’s law, the force between two point charges is |
| A. | Directly proportional to the product of the charges |
| B. | Inversely proportional to the square of the distance between them |
| C. | Along the line joining them |
| D. | All of these |
| Answer» E. | |
| 148. |
According, to Kirchoff’s voltage law |
| A. | The algebraic sum of all the e.m.f’s in the circuit is zero |
| B. | Algebraic sum all the voltage drops in the circuit is zero |
| C. | Algebraic sum of e.m.f’s plus algebraic sum of voltage drops is equal to zero |
| D. | All of these |
| Answer» D. All of these | |
| 149. |
A vector quantity has |
| A. | Only magnitude |
| B. | Only direction |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 150. |
A radian is defined as the central angle, for which length of its arc |
| A. | Should be greater than radius |
| B. | Should be less than radius |
| C. | Should be equal to the radius |
| D. | None of these |
| Answer» D. None of these | |