MCQOPTIONS
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MCQOPTIONS
This section includes 682 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
Which of the following is a ferromagnetic material ? |
| A. | tungsten |
| B. | aluminium |
| C. | copper |
| D. | nickel |
| Answer» E. | |
| 352. |
In the left hand rule, forefinger always represents |
| A. | voltage |
| B. | current |
| C. | magnetic field |
| D. | direction of force on the conductor |
| Answer» D. direction of force on the conductor | |
| 353. |
Substances which have permeability less than the permeability of free space are known as |
| A. | ferromagnetic |
| B. | paramagnetic |
| C. | diamagnetic |
| D. | bipolar |
| Answer» D. bipolar | |
| 354. |
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» D. equal to that ferromagnetic mate rials | |
| 355. |
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» E. | |
| 356. |
The main constituent of permalloy is |
| A. | cobalt |
| B. | chromium |
| C. | nickel |
| D. | tungsten |
| Answer» D. tungsten | |
| 357. |
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» C. high co-ercivity and high reten-tivity | |
| 358. |
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» E. | |
| 359. |
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» B. bli | |
| 360. |
The unit of relative permeability is |
| A. | henry/metre |
| B. | henry |
| C. | henry/sq. m |
| D. | it is dimensionless |
| Answer» E. | |
| 361. |
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» E. | |
| 362. |
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» C. relative permeability | |
| 363. |
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» D. polarity of a magnetic pole | |
| 364. |
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» C. the magnetic field will not be affected | |
| 365. |
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» C. paramag>etic material | |
| 366. |
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» C. proportional to distance between the conductors | |
| 367. |
Which of the following is a vector quantity ? |
| A. | relative permeability |
| B. | magnetic field intensity |
| C. | flux density |
| D. | magnetic potential |
| Answer» C. flux density | |
| 368. |
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» C. from one end of the magnet to another | |
| 369. |
Air gap has eluctance as compared to iron or steel path |
| A. | little |
| B. | lower |
| C. | higher |
| D. | zero |
| Answer» C. higher | |
| 370. |
Ferrites are materials. |
| A. | paramagnetic |
| B. | diamagnetic |
| C. | ferromagnetic |
| D. | none of the above |
| Answer» D. none of the above | |
| 371. |
A magnetic field exists around |
| A. | iron |
| B. | copper |
| C. | aluminium |
| D. | moving charges |
| Answer» E. | |
| 372. |
The materials having low retentivity are suitable for making |
| A. | weak magnets |
| B. | temporary magnets |
| C. | permanent magnets |
| D. | none of the above |
| Answer» C. permanent magnets | |
| 373. |
Tesla is a unit of |
| A. | field strength |
| B. | inductance |
| C. | flux density |
| D. | flux |
| Answer» D. flux | |
| 374. |
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» C. dielectric as well as metal plates | |
| 375. |
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. | |
| 376. |
A capacitance is a circuit component that opposes the change in circuit |
| A. | current |
| B. | voltage |
| C. | impedance |
| D. | none of the above |
| Answer» B. voltage | |
| 377. |
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 | |
| 378. |
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 | |
| 379. |
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 | |
| 380. |
Which is the most superior dielectric out of the following ? |
| A. | air |
| B. | glass |
| C. | bakelite |
| D. | paper |
| Answer» D. paper | |
| 381. |
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. | |
| 382. |
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 | |
| 383. |
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 | |
| 384. |
The minimum value of potential gradient in a cable occurs in |
| A. | insulation |
| B. | conductor |
| C. | outer sheath |
| D. | uniformly all over |
| Answer» B. conductor | |
| 385. |
A region around a stationary electric charge has |
| A. | an electric field |
| B. | a magnetic field |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» B. a magnetic field | |
| 386. |
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 | |
| 387. |
Which of the following capacitors preferred for high frequency circuits ? |
| A. | air capacitor |
| B. | electrolytic capacitor |
| C. | mica capacitor |
| D. | none of the above |
| Answer» D. none of the above | |
| 388. |
In order to remove static electricity from machinery |
| A. | construct insulated cabins |
| B. | insulate the machinery |
| C. | ground the framework |
| D. | humidify the surroundings |
| Answer» D. humidify the surroundings | |
| 389. |
An electrolytic capacitor is generally made to provide |
| A. | low capacitance |
| B. | fixed capacitance |
| C. | variable capacitance |
| D. | large value of capacitance |
| Answer» E. | |
| 390. |
The ohmmeter reading for a short circuited capacitor is |
| A. | infinity |
| B. | few kilo ohms |
| C. | few megaahms |
| D. | zero |
| Answer» E. | |
| 391. |
A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is |
| A. | 100 kv/m |
| B. | 10 kv/m |
| C. | 5 kv/m |
| D. | 2 kv/m |
| Answer» B. 10 kv/m | |
| 392. |
Which of the following statements is correct ? |
| A. | mica capacitors are available in capacitance values of 5 to 20 \\if |
| B. | air capapitors have a black band to indicate the outside foil |
| C. | electrolytic capacitors must be connected in correct polarity |
| D. | ceramic capacitors must be con¬nected in correct polarity |
| Answer» D. ceramic capacitors must be con¬nected in correct polarity | |
| 393. |
Mica capacitors are characterised by all of thte following except |
| A. | stable operation |
| B. | accurate value |
| C. | low leakage reactance |
| D. | low losses |
| Answer» D. low losses | |
| 394. |
Out of the following capacitors of identical rating which one will have the smallest dimensions ? |
| A. | aluminium foil capacitor |
| B. | mica capacitor |
| C. | ceramic capacitor |
| D. | paper capacitor |
| Answer» D. paper capacitor | |
| 395. |
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 | |
| 396. |
The bridge used for the measurement of the value of the capacitance is |
| A. | wien\s bridge |
| B. | wheatstone bridge |
| C. | schering bridge |
| D. | hay\s bridge |
| Answer» D. hay\s bridge | |
| 397. |
The capacitance C is charged through a resistance R. The time constant of the charging circuit is given by |
| A. | cir |
| B. | 1/rc |
| C. | rc |
| D. | ric |
| Answer» D. ric | |
| 398. |
One volt is the same as |
| A. | one joule/coulomb |
| B. | one coulomb/joule |
| C. | one coulomb |
| D. | one joule |
| Answer» B. one coulomb/joule | |
| 399. |
Which medium has the least dielectric strength ? |
| A. | paraffin wax |
| B. | quartz |
| C. | glass |
| D. | air |
| Answer» E. | |
| 400. |
What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it ? |
| A. | it will become magnetic |
| B. | it will melt |
| C. | it will get punctured or cracked |
| D. | its molecular structure will get changed |
| Answer» D. its molecular structure will get changed | |