McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 301. |
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» B. micro-coulomb | |
| 302. |
Dielectric strength of a medium is usually expressed in |
| A. | j/mm |
| B. | c/m2 |
| C. | kv/mm |
| D. | n/mm |
| Answer» C. kv/mm | |
| 303. |
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» D. 25 times larger than before | |
| 304. |
Which is the most superior dielectric out of the following ? |
| A. | air |
| B. | glass |
| C. | bakelite |
| D. | paper |
| Answer» C. bakelite | |
| 305. |
When a dielectric is placed in an electric field the field strength |
| A. | decreases |
| B. | increases |
| C. | reduces to zero |
| D. | remain unchanged |
| Answer» A. decreases | |
| 306. |
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» B. conductive dressing is done | |
| 307. |
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» C. electrolytic capacitor | |
| 308. |
A capacitance is a circuit component that opposes the change in circuit |
| A. | current |
| B. | voltage |
| C. | impedance |
| D. | none of the above |
| Answer» A. current | |
| 309. |
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» D. poled aluminium electrolytic condenser | |
| 310. |
In a capacitor, the electric charge is stored in |
| A. | metal plates |
| B. | dielectric |
| C. | dielectric as well as metal plates |
| D. | none of the above |
| Answer» B. dielectric | |
| 311. |
Tesla is a unit of |
| A. | field strength |
| B. | inductance |
| C. | flux density |
| D. | flux |
| Answer» C. flux density | |
| 312. |
The materials having low retentivity are suitable for making |
| A. | weak magnets |
| B. | temporary magnets |
| C. | permanent magnets |
| D. | none of the above |
| Answer» B. temporary magnets | |
| 313. |
A magnetic field exists around |
| A. | iron |
| B. | copper |
| C. | aluminium |
| D. | moving charges |
| Answer» D. moving charges | |
| 314. |
Ferrites are materials. |
| A. | paramagnetic |
| B. | diamagnetic |
| C. | ferromagnetic |
| D. | none of the above |
| Answer» C. ferromagnetic | |
| 315. |
Air gap has eluctance as compared to iron or steel path |
| A. | little |
| B. | lower |
| C. | higher |
| D. | zero |
| Answer» B. lower | |
| 316. |
The direction of magnetic lines of force is |
| A. | from south pole to north pole |
| B. | from north pole to south pole |
| C. | from one end of the magnet to another |
| D. | none of the above |
| Answer» B. from north pole to south pole | |
| 317. |
Which of the following is a vector quantity ? |
| A. | relative permeability |
| B. | magnetic field intensity |
| C. | flux density |
| D. | magnetic potential |
| Answer» B. magnetic field intensity | |
| 318. |
The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is |
| A. | proportional to 7 |
| B. | proportional to x |
| C. | proportional to distance between the conductors |
| D. | inversely proportional to i |
| Answer» B. proportional to x | |
| 319. |
A material which is slightly repelled by a magnetic field is known as |
| A. | ferromagnetic material |
| B. | diamagnetic material |
| C. | paramag>etic material |
| D. | conducting material |
| Answer» B. diamagnetic material | |
| 320. |
When an iron piece is placed in a magnetic field |
| A. | the magnetic lines of force will bend away from their usual paths in order to go away from the piece |
| B. | the magnetic lines of force will bend away from their usual paths in order to pass through the piece |
| C. | the magnetic field will not be affected |
| D. | the iron piece will break |
| Answer» B. the magnetic lines of force will bend away from their usual paths in order to pass through the piece | |
| 321. |
Fleming's left hand rule is used to find |
| A. | direction of magnetic field due to current carrying conductor |
| B. | direction of flux in a solenoid |
| C. | direction of force on a current car¬rying conductor in a magnetic field |
| D. | polarity of a magnetic pole |
| Answer» C. direction of force on a current car¬rying conductor in a magnetic field | |
| 322. |
The ratio of intensity of magnetisation to the magnetisation force is known as |
| A. | flux density |
| B. | susceptibility |
| C. | relative permeability |
| D. | none of the above |
| Answer» B. susceptibility | |
| 323. |
The left hand rule correlates to |
| A. | current, induced e.m.f. and direc¬tion of force on a conductor |
| B. | magnetic field, electric field and direction of force on a conductor |
| C. | self induction, mutual induction and direction of force on a conductor |
| D. | current, magnetic field and direc¬tion of force on a conductor |
| Answer» D. current, magnetic field and direc¬tion of force on a conductor | |
| 324. |
The unit of relative permeability is |
| A. | henry/metre |
| B. | henry |
| C. | henry/sq. m |
| D. | it is dimensionless |
| Answer» D. it is dimensionless | |
| 325. |
A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be |
| A. | zero |
| B. | bli |
| C. | b2li |
| D. | bli2 |
| Answer» A. zero | |
| 326. |
The force between two long parallel conductors is inversely proportional to |
| A. | radius of conductors |
| B. | current in one conductor |
| C. | product of current in two conduc¬tors |
| D. | distance between the conductors |
| Answer» D. distance between the conductors | |
| 327. |
Materials subjected to rapid reversal of magnetism should have |
| A. | large area oib-h loop |
| B. | high permeability and low hysteresis loss |
| C. | high co-ercivity and high reten-tivity |
| D. | high co-ercivity and low density |
| Answer» B. high permeability and low hysteresis loss | |
| 328. |
The main constituent of permalloy is |
| A. | cobalt |
| B. | chromium |
| C. | nickel |
| D. | tungsten |
| Answer» C. nickel | |
| 329. |
Paramagnetic materials have relative permeability |
| A. | slightly less than uuity |
| B. | equal to unity |
| C. | slightly more than unity |
| D. | equal to that ferromagnetic mate rials |
| Answer» C. slightly more than unity | |
| 330. |
Substances which have permeability less than the permeability of free space are known as |
| A. | ferromagnetic |
| B. | paramagnetic |
| C. | diamagnetic |
| D. | bipolar |
| Answer» C. diamagnetic | |
| 331. |
Two infinitely long parallel conductors in vacuum anf' separated 1 metre between centres >rhen a current of 1 ampere flows thn. ugh each conductor, produce on each otLer a force of |
| A. | 2 x 1(t2 n/m) |
| B. | 2 x kt3 n/m |
| C. | 2 x 10"5 n/m |
| D. | 2x 1(t7 n/m) |
| Answer» D. 2x 1(t7 n/m) | |
| 332. |
In the left hand rule, forefinger always represents |
| A. | voltage |
| B. | current |
| C. | magnetic field |
| D. | direction of force on the conductor |
| Answer» C. magnetic field | |
| 333. |
Which of the following is a ferromagnetic material ? |
| A. | tungsten |
| B. | aluminium |
| C. | copper |
| D. | nickel |
| Answer» D. nickel | |
| 334. |
Ferrites are a sub-group of |
| A. | non-magnetic materials |
| B. | ferro-magnetic materials |
| C. | paramagnetic materials |
| D. | ferri-magnetic materials |
| Answer» D. ferri-magnetic materials | |
| 335. |
Gilbert is a unit of |
| A. | electromotive force |
| B. | magnetomotive force |
| C. | conductance |
| D. | permittivity |
| Answer» B. magnetomotive force | |
| 336. |
The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields |
| A. | meter is surrounded by strong magnetic fields |
| B. | a soft iron shielding is used |
| C. | a plastic shielding is provided |
| D. | a shielding of anon-magnetic material is used |
| Answer» B. a soft iron shielding is used | |
| 337. |
Reciprocal of permeability is |
| A. | reluctivity |
| B. | susceptibility |
| C. | permittivity |
| D. | conductance |
| Answer» A. reluctivity | |
| 338. |
The relative permeability is less than unity is case of |
| A. | ferromagnetic materials |
| B. | ferrites |
| C. | non-ferrous materials |
| D. | diamagnetic materials |
| Answer» D. diamagnetic materials | |
| 339. |
Which of the following is the unit of magnetic flux density ? |
| A. | weber |
| B. | lumens |
| C. | tesla |
| D. | none of the above |
| Answer» C. tesla | |
| 340. |
The magnetism left in the iron after exciting field has been removed is known as |
| A. | permeance |
| B. | residual magnetism |
| C. | susceptance |
| D. | reluctance |
| Answer» B. residual magnetism | |
| 341. |
Which of the following is not a unit of flux? |
| A. | maxwell |
| B. | telsa |
| C. | weber |
| D. | all of the above |
| Answer» B. telsa | |
| 342. |
Which of the following is expected to have the maximum permeability ? |
| A. | brass |
| B. | copper |
| C. | zinc |
| D. | ebonite |
| Answer» D. ebonite | |
| 343. |
One telsa is equal to |
| A. | 1 wb/mm2 |
| B. | 1 wb/m |
| C. | 1 wb/m2 |
| D. | 1 mwb/m2 |
| Answer» C. 1 wb/m2 | |
| 344. |
Out of the following statements, concerning an electric field, which statement is not true ? |
| A. | the electric intensity is a vector quantity |
| B. | the electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point |
| C. | an electric field is defined as a point in space at which an electric charge would experienc* a force |
| D. | unit field intensity in the exertion of a force of one newton on a charge of one coulomb |
| Answer» B. the electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point | |
| 345. |
When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon |
| A. | resistance of the coil |
| B. | motion of the magnet |
| C. | number of turns of the coil |
| D. | pole strength of the magnet |
| Answer» A. resistance of the coil | |
| 346. |
One maxwell is equal to |
| A. | 10 webers |
| B. | 10 webers |
| C. | 10 webers |
| D. | 10 webers |
| Answer» D. 10 webers | |
| 347. |
When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the centre of the circle |
| A. | will be zero |
| B. | will be infinite |
| C. | will depend on the amount of e.m.f. applied |
| D. | will depend on the radius of the circle |
| Answer» D. will depend on the radius of the circle | |
| 348. |
Susceptibility is positive for |
| A. | non-magnetic substances |
| B. | diamagnetic substances |
| C. | ferromagnetic substances |
| D. | none of the above |
| Answer» C. ferromagnetic substances | |
| 349. |
Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per metre of length of each conductor will be |
| A. | 100 n |
| B. | 10 n |
| C. | 1 n |
| D. | 0.1 n |
| Answer» D. 0.1 n | |
| 350. |
The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength ? |
| A. | 2500 at/m |
| B. | 250 at/m |
| C. | 25 at/m |
| D. | 2.5 at/m |
| Answer» B. 250 at/m | |
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