MCQOPTIONS
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MCQOPTIONS
This section includes 135 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
If the magnetic field in region is given by B = 4i + 8k then the flux passing through a 5m2 area loop will be |
| A. | 20i + 40k Wb |
| B. | 20Wb |
| C. | 40Wb |
| D. | 30Wb |
| Answer» D. 30Wb | |
| 102. |
In moving coil galvanometer the pole faces of U-shaped magnet are made concave |
| A. | to make the field radial |
| B. | to increase the field |
| C. | to weaken field |
| D. | both a and b |
| Answer» B. to increase the field | |
| 103. |
In e/m experiment path of electron is made visible by filling |
| A. | H2 at high pressure |
| B. | N2 at high pressure |
| C. | H2 at low pressure |
| D. | O2 at low pressure |
| Answer» D. O2 at low pressure | |
| 104. |
The device used to measure the potential difference between two points in volts is known as |
| A. | ohmmeter |
| B. | Avometer |
| C. | ammeter |
| D. | voltmeter |
| Answer» E. | |
| 105. |
If a current carrying conductor is placed in uniform magnetic field parallel to direction of field then the force experienced by conductor will be |
| A. | ILBCos |
| B. | ILB |
| C. | zero |
| D. | ILBSin |
| Answer» D. ILBSin | |
| 106. |
Which among the following, is the correct expression for force in a current carrying conductor if magnetic field is perpendicular to it? |
| A. | F=Bi |
| B. | F=B2il |
| C. | F=Bil |
| D. | F=Bl2 |
| Answer» D. F=Bl2 | |
| 107. |
The relation between the direction of force and the direction of magnetic field is __________ |
| A. | Same direction |
| B. | Opposite direction |
| C. | Perpendicular |
| D. | Unrelated |
| Answer» D. Unrelated | |
| 108. |
The relation between the direction of current and the direction of the force is ________ |
| A. | Same direction |
| B. | Opposite direction |
| C. | Perpendicular |
| D. | Unrelated |
| Answer» D. Unrelated | |
| 109. |
The magnetic field of the solenoid is 18.84mT, the current is 30A. Calculate the number of turns per unit length if the core is air. |
| A. | 1500 turns/m |
| B. | 1000 turns/m |
| C. | 500 turns /m |
| D. | 2000 turns/m |
| Answer» D. 2000 turns/m | |
| 110. |
What happens to the magnetic field in the solenoid when the current increases? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Becomes zero |
| Answer» B. Decreases | |
| 111. |
The force per unit length existing between two infinite parallel conductors is given by ___________ |
| A. | µ0i1i2/2pd |
| B. | µ0i1i2/2d |
| C. | µ0i1/2pdi2 |
| D. | µ0i1i2/d |
| Answer» B. µ0i1i2/2d | |
| 112. |
If current of conductor increases, what is the effect on the force? |
| A. | increases |
| B. | decreases |
| C. | remain same |
| D. | become zero |
| Answer» B. decreases | |
| 113. |
Magnetic field is strong when____________ |
| A. | magnetic field lines are closer |
| B. | magnetic field lines are farther |
| C. | magnetic field lines are longer |
| D. | magnetic field lines are thicker |
| Answer» B. magnetic field lines are farther | |
| 114. |
The force existing between two infinite parallel conductors is inversely proportional to ________ |
| A. | Radius of the conductors |
| B. | Current in one of the conductors |
| C. | The product of the current in the two conductors |
| D. | The distance between the two conductors |
| Answer» E. | |
| 115. |
More the number of magnetic flux lines _______ is the force of the magnet. |
| A. | Greater |
| B. | Lesser |
| C. | Either greater or lesser |
| D. | Neither greater nor lesser |
| Answer» B. Lesser | |
| 116. |
Magnetic field at a point d distance away from long wire due to electric current i in it is ____________ |
| A. | µ0i/2r |
| B. | µ0i/r |
| C. | µ0i/2pr |
| D. | µ0i/pr |
| Answer» D. µ0i/pr | |
| 117. |
If length of current carrying conductor increases, what is the effect on the force? |
| A. | increases |
| B. | decreases |
| C. | remain same |
| D. | become zero |
| Answer» B. decreases | |
| 118. |
Magnetic field lines ___________ at the south pole. |
| A. | Emerge |
| B. | Converge |
| C. | Neither emerge nor converge |
| D. | Either emerge or converge |
| Answer» C. Neither emerge nor converge | |
| 119. |
The relation between the direction of force and the direction of magnetic field is _________ |
| A. | Same direction |
| B. | Opposite direction |
| C. | Perpendicular |
| D. | Unrelated |
| Answer» D. Unrelated | |
| 120. |
The relation between the direction of current and the direction of the force is _________ |
| A. | Same direction |
| B. | Opposite direction |
| C. | Perpendicular |
| D. | Unrelated |
| Answer» D. Unrelated | |
| 121. |
The relation between the direction of current and the direction of magnetic field is ________ |
| A. | Same direction |
| B. | Opposite direction |
| C. | Perpendicular |
| D. | Unrelated |
| Answer» D. Unrelated | |
| 122. |
Magnetic Field lines move from _______ |
| A. | North to south |
| B. | South to north |
| C. | West to east |
| D. | East to west |
| Answer» B. South to north | |
| 123. |
When the magnetic field intensity in the current carrying conductor increases, what happens to the force in the conductor which is at right angles to the magnetic field? |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | Becomes zero |
| Answer» B. Decreases | |
| 124. |
If net force is zero on a particle in magnetic field what is relation between velocity and magnetic field? |
| A. | v=E*B |
| B. | v=E/B |
| C. | v=B/E |
| D. | v=1/(E*B) |
| Answer» C. v=B/E | |
| 125. |
Force in current carrying conductor placed in magnetic field is ___________ of il and B. |
| A. | dot product |
| B. | scalar product |
| C. | cross product |
| D. | vector addition |
| Answer» D. vector addition | |
| 126. |
If the intensity of the magnetic field is 100T, the length of the conductor is 10m and the magnitude of force perpendicular to the magnetic field is 10kN,calculate the current in the conductor. |
| A. | 100 A |
| B. | 100 mA |
| C. | 10 A |
| D. | 10 mA |
| Answer» D. 10 mA | |
| 127. |
If the intensity of the magnetic field perpendicular to current carrying conductor is 100T, the length of the conductor is 3m and the current in the conductor is 10A, calculate the magnitude of force perpendicular to the electric field. |
| A. | 300N |
| B. | 30N |
| C. | 30kN |
| D. | 3kN |
| Answer» E. | |
| 128. |
What is the full form of Emf in Electromagnetism? |
| A. | Electronic magnetic force |
| B. | Electromotive force |
| C. | Electromagnetic force |
| D. | Electromated force |
| Answer» C. Electromagnetic force | |
| 129. |
Find the strength of the magnetic field in a conductor 0.5m long moving with a velocity of 10m/s, inducing an emf of 20V if magnetic field, velocity and length of conductor are mutually perpendicular to each other. |
| A. | 1T |
| B. | 2T |
| C. | 3T |
| D. | 4T |
| Answer» E. | |
| 130. |
Which, among the following, is the formula for induced emf? |
| A. | e=d? /dt |
| B. | e=dt/d? |
| C. | e=t*? |
| D. | e=t2? |
| Answer» B. e=dt/d? | |
| 131. |
Voltage induced in secondary coil of transformer is given by__________________ |
| A. | NP*VP/NS |
| B. | NS*VP/NP |
| C. | (NP/VP)*NS |
| D. | NP/(VP*NS) |
| Answer» C. (NP/VP)*NS | |
| 132. |
If a conductor 0.2m long moves with a velocity of 0.3m/s in a magnetic field of 5T, calculate the emf induced if magnetic field, velocity and length of conductor are mutually perpendicular to each other. |
| A. | 0.3V |
| B. | 0.03V |
| C. | 30V |
| D. | 3V |
| Answer» B. 0.03V | |
| 133. |
Find the length of a conductor which is moving with a velocity 0.4m/s in a magnetic field of 8T, inducing an emf of 20V if magnetic field, velocity and length of conductor are mutually perpendicular to each other. |
| A. | 50m |
| B. | 5m |
| C. | 6.25m |
| D. | 0.5m |
| Answer» D. 0.5m | |
| 134. |
The formula for induced emf if magnetic field, length and velocity of conductor all are mutually perpendicular is __________ |
| A. | emf=B2l |
| B. | emf=Bil |
| C. | emf=Blv |
| D. | emf=B2v |
| Answer» D. emf=B2v | |
| 135. |
What is emf? |
| A. | Force |
| B. | Voltage |
| C. | Current |
| D. | Flux |
| Answer» C. Current | |