MCQOPTIONS
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MCQOPTIONS
This section includes 517 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. |
There is a greater possibility of occurrence of corona during |
| A. | Dry weather |
| B. | Winter |
| C. | Summer heat |
| D. | Humid weather |
| Answer» E. | |
| 352. |
Most of the high voltage transmission lines in India are |
| A. | Underground |
| B. | Overhead |
| C. | Either of the above |
| D. | None of the above |
| Answer» C. Either of the above | |
| 353. |
Which of the following distribution systems is more reliable? |
| A. | Radial system |
| B. | Tree system |
| C. | Ring main system |
| D. | All are equally reliable |
| Answer» D. All are equally reliable | |
| 354. |
When a conductor carries more current on the surface as compared to core, it is due to |
| A. | Permeability variation |
| B. | Corona |
| C. | Skin effect |
| D. | Unsymmetrical fault |
| Answer» D. Unsymmetrical fault | |
| 355. |
The operating voltage of extra high tension cables is upto |
| A. | 6.6 kV |
| B. | 11 kV |
| C. | 33 kV |
| D. | 66 kV |
| Answer» E. | |
| 356. |
The voltage drop, for constant voltage transmission is compensated by installing |
| A. | Inductors |
| B. | Capacitors |
| C. | Synchronous motors |
| D. | All of above |
| Answer» D. All of above | |
| 357. |
For which of the following equipment current rating is not necessary? |
| A. | Circuit breakers |
| B. | Isolators |
| C. | Load break switch |
| D. | Circuit breakers and load break switches |
| Answer» C. Load break switch | |
| 358. |
The angular displacement between two interconnected stations is mainly due to |
| A. | Armature reactance of both alternators |
| B. | Reactance of the interconnector |
| C. | Synchronous reactance of both the alternators |
| D. | All of the above |
| Answer» B. Reactance of the interconnector | |
| 359. |
In a D.C. 3-wire distribution system, balancer fields are cross-connected in order to |
| A. | boost the generated voltage |
| B. | balance loads on both sides of the neutral |
| C. | make both machine^ run as unloaded motors |
| D. | equalize voltages on the positive and negative outers |
| Answer» E. | |
| 360. |
The steel used in steel cored conductors is usually |
| A. | Alloy steel |
| B. | Stainless steel |
| C. | Mild steel |
| D. | High speed steel |
| Answer» D. High speed steel | |
| 361. |
For transmission of power over a distance of 200 km, the transmission voltage should be |
| A. | 132 kV |
| B. | 66 kV |
| C. | 33 kV |
| D. | 11 kV |
| Answer» B. 66 kV | |
| 362. |
Which of the following D.C. distribution system is the simplest and lowest in first cost? |
| A. | Radial system |
| B. | Ring system |
| C. | Interconnected system |
| D. | None of the above |
| Answer» B. Ring system | |
| 363. |
For transmission of power over a distance of 500 km, the transmission voltage should be in the range |
| A. | 150 to 220 kV |
| B. | 100 to 120 kV |
| C. | 60 to 100 kV |
| D. | 20 to 50 kV |
| Answer» B. 100 to 120 kV | |
| 364. |
The underground system cannot be operated above |
| A. | 440 V |
| B. | 11 V |
| C. | 33 V |
| D. | 66 V |
| Answer» E. | |
| 365. |
Electromechanical voltage regulators are generally used in |
| A. | Reactors |
| B. | Generators |
| C. | Transformers |
| D. | All of the above |
| Answer» C. Transformers | |
| 366. |
Which of the following is the demerit of a 'constant voltage transmission system'? |
| A. | Increase of short-circuit current of the system |
| B. | Availability of steady voltage at all loads at the line terminals |
| C. | Possibility of better protection for the line due to possible use of higher terminal reactants |
| D. | Improvement of power factor at times of moderate and heavy loads |
| Answer» B. Availability of steady voltage at all loads at the line terminals | |
| 367. |
The skin effect of a conductor will reduce as the |
| A. | Resistivity of conductor material increases |
| B. | Permeability of conductor material increases |
| C. | Diameter increases |
| D. | Frequency increases |
| Answer» B. Permeability of conductor material increases | |
| 368. |
The operating voltage of super-tension cables is up to |
| A. | 3.3 kV |
| B. | 6.6 kV |
| C. | 11 kV |
| D. | 33 kV |
| Answer» E. | |
| 369. |
The cause of damage to the lead sheath of a cable is |
| A. | crystallisation of the lead through vibration |
| B. | chemical action on the lead when buried in the earth |
| C. | mechanical damage |
| D. | all of the above |
| Answer» E. | |
| 370. |
A conductor, due to sag between two supports, takes the form of |
| A. | Semicircle |
| B. | Triangle |
| C. | Ellipse |
| D. | Catenary |
| Answer» E. | |
| 371. |
A 3-phase 4-wire system is commonly used on |
| A. | Primary transmission |
| B. | Secondary transmission |
| C. | Primary distribution |
| D. | Secondary distribution |
| Answer» E. | |
| 372. |
Distribution lines in India generally use |
| A. | Wooden poles |
| B. | R.C.C. poles |
| C. | Steel towers |
| D. | None of the above |
| Answer» C. Steel towers | |
| 373. |
When the interconnector between two stations has large reactance |
| A. | The transfer of power will take place with voltage fluctuation and noise |
| B. | The transfer of power will take place with least loss |
| C. | The stations will fall out of step because of large angular displacement between the stations |
| D. | None of the above |
| Answer» D. None of the above | |
| 374. |
Which of the following is usually not the generating voltage? |
| A. | 6.6 kV |
| B. | 8.8 kV |
| C. | 11 kV |
| D. | 13.2 kV |
| Answer» C. 11 kV | |
| 375. |
The loads on distributors systems are generally |
| A. | Balanced |
| B. | Unbalanced |
| C. | Either of the above |
| D. | None of the above |
| Answer» C. Either of the above | |
| 376. |
The power transmitted will be maximum when |
| A. | Corona losses are minimum |
| B. | Reactance is high |
| C. | Sending end voltage is more |
| D. | Receiving end voltage is more |
| Answer» D. Receiving end voltage is more | |
| 377. |
The wooden poles well impregnated with creosote oil or any preservative compound has life |
| A. | From 2 to 5 years |
| B. | 10 to 15 years |
| C. | 25 to 30 years |
| D. | 60 to 70 years |
| Answer» D. 60 to 70 years | |
| 378. |
Which of the following faults is most likely to occur in cables? |
| A. | Cross or short-circuit fault |
| B. | Open circuit fault |
| C. | Breakdown of cable insulation |
| D. | All of the above |
| Answer» E. | |
| 379. |
Which of the following is the source of heat generation in the cables? |
| A. | Dielectric losses in cable insulation |
| B. | losses in the conductor |
| C. | Losses in the metallic sheathings and armourings |
| D. | All of the above |
| Answer» E. | |
| 380. |
Besides a method of trial and error, which of the following methods is employed for solution of network problems in interconnected system? |
| A. | Circulating current method |
| B. | Thevenin's theorem |
| C. | Superposition of currents |
| D. | All of the above |
| Answer» E. | |
| 381. |
Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased 100 percent, saving in copper is |
| A. | 25 percent |
| B. | 50 percent |
| C. | 75 percent |
| D. | 100 percent |
| Answer» C. 75 percent | |
| 382. |
Low voltage cables are meant for use up to |
| A. | 1.1 kV |
| B. | 3.3 kV |
| C. | 6.6 kV |
| D. | 11 kV |
| Answer» B. 3.3 kV | |
| 383. |
By which of the following systems electric power may be transmitted? |
| A. | Overhead system |
| B. | Underground system |
| C. | Both (A) and (B) |
| D. | None of the above |
| Answer» D. None of the above | |
| 384. |
are the conductors, which connect the consumer's terminals to the distribution |
| A. | Distributors |
| B. | Service mains |
| C. | Feeders |
| D. | None of the above |
| Answer» C. Feeders | |
| 385. |
The current drawn by the line due to corona losses is |
| A. | Non-sinusoidal |
| B. | Sinusoidal |
| C. | Triangular |
| D. | Square |
| Answer» B. Sinusoidal | |
| 386. |
A uniformly loaded D.C. distributor is fed at both ends with equal voltages. As compared to a similar distributor fed at one end only, the drop at the middle point is |
| A. | One-fourth |
| B. | One-third |
| C. | One-half |
| D. | Twice |
| Answer» B. One-third | |
| 387. |
The minimum clearance between the ground and a 220 kV line is about |
| A. | 4.3 m |
| B. | 5.5 m |
| C. | 7.0 m |
| D. | 10.5 m |
| Answer» D. 10.5 m | |
| 388. |
Which of the following methods is used for laying of underground cables? |
| A. | Direct laying |
| B. | Draw-in-system |
| C. | Solid system |
| D. | All of the above |
| Answer» E. | |
| 389. |
Which of the following relays is used on long transmission lines? |
| A. | Impedance relay |
| B. | Mho's relay |
| C. | Reactance relay |
| D. | None of the above |
| Answer» C. Reactance relay | |
| 390. |
Transmission voltage of ll kV is normally used for distances upto |
| A. | 20 - 25 km |
| B. | 40 - 50 km |
| C. | 60 - 70 km |
| D. | 80 - 100 km |
| Answer» B. 40 - 50 km | |
| 391. |
The corona is considerably affected by which of the following? |
| A. | Size of the conductor |
| B. | Shape of the conductor |
| C. | Surface condition of the conductor |
| D. | All of the above |
| Answer» E. | |
| 392. |
Multi-core cables generally use |
| A. | Square conductors |
| B. | Circular conductors |
| C. | Rectangular conductors |
| D. | None of the above |
| Answer» E. | |
| 393. |
The conductors of the overhead lines are |
| A. | solid |
| B. | stranded |
| C. | both solid and stranded |
| D. | none of the above |
| Answer» D. none of the above | |
| 394. |
The wooden poles well impregnated with creosite oil or any preservative compound have life |
| A. | from 2 to 5 years |
| B. | 10 to 15 years |
| C. | 25 to 30 years |
| D. | 60 to 70 years |
| Answer» D. 60 to 70 years | |
| 395. |
The voltage of the single phase supply to residential consumers is |
| A. | 110 V |
| B. | 210 V |
| C. | 230 V |
| D. | 400 V |
| Answer» D. 400 V | |
| 396. |
In a substation the following equipment is not installed |
| A. | Exciters |
| B. | Series capacitors |
| C. | Shunt reactors |
| D. | Voltaire transformers |
| Answer» B. Series capacitors | |
| 397. |
Large industrial consumers are supplied electrical energy at |
| A. | 400 V |
| B. | 11 kV |
| C. | 66 kV |
| D. | 400 kV |
| Answer» D. 400 kV | |
| 398. |
A circuit is disconnected by isolators when |
| A. | Line is energized |
| B. | There is no current in the line |
| C. | Line is on full load |
| D. | Circuit breaker is not open |
| Answer» C. Line is on full load | |
| 399. |
In the analysis of which of the following lines shunt capacitance is neglected?%! |
| A. | Short transmission lines |
| B. | Medium transmission lines |
| C. | Long transmission lines |
| D. | Medium as well as long transmission lines |
| Answer» B. Medium transmission lines | |
| 400. |
When a live conductor of public electric supply breaks down and touches the earth which of the following will happen?%! |
| A. | Current will flow to earth |
| B. | Supply voltage will drop |
| C. | Supply voltage will increase |
| D. | No current will flow in the conductor |
| Answer» B. Supply voltage will drop | |