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.
| 401. |
By which of the following methods string efficiency can be improved?%! |
| A. | Using a guard ring |
| B. | Grading the insulator |
| C. | Using long cross arm |
| D. | Any of the above |
| Answer» E. | |
| 402. |
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 | |
| 403. |
jCorona usually occurs when the electrostatic stress in air around the conductor exceeds%! |
| A. | 6.6 kV (r.m.s. value)/cm |
| B. | 11 kV (r.m.s. value)/cm |
| C. | 22 kV (maximum value)/cm |
| D. | 30 kV (maximum value)/cm |
| Answer» E. | |
| 404. |
A 3-phase 4-wire system is commonly used on%! |
| A. | Primary transmission |
| B. | Secondary transmission |
| C. | Primary distribution |
| D. | Secondary distribution |
| Answer» E. | |
| 405. |
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 | |
| 406. |
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 | |
| 407. |
In a substation the following equipment is not installed%! |
| A. | Exciters |
| B. | Series capacitors |
| C. | Shunt reactors |
| D. | Voltaire transformers |
| Answer» B. Series capacitors | |
| 408. |
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 | |
| 409. |
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 | |
| 410. |
*$_A 3-phase 4-wire system is commonly used on? |
| A. | Primary transmission |
| B. | Secondary transmission |
| C. | Primary distribution |
| D. | Secondary distribution |
| Answer» E. | |
| 411. |
*$_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 | |
| 412. |
*$_Overhead system can be designed for operation up to? |
| A. | 11 kV |
| B. | 33 kV |
| C. | 66 kV |
| D. | 400 kV |
| Answer» D. 400 kV | |
| 413. |
*$_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 | |
| 414. |
*$_By which of the following methods string efficiency can be improved?? |
| A. | Using a guard ring |
| B. | Grading the insulator |
| C. | Using long cross arm |
| D. | Any of the above |
| Answer» E. | |
| 415. |
*$_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 | |
| 416. |
*$_In the analysis of which of the following lines shunt capacitance is neglected?? |
| A. | Short transmission lines |
| B. | Medium transmission lines |
| C. | Long transmission lines |
| D. | Medium as well as long transmission lines |
| Answer» B. Medium transmission lines | |
| 417. |
*$_jCorona usually occurs when the electrostatic stress in air around the conductor exceeds? |
| A. | 6.6 kV (r.m.s. value)/cm |
| B. | 11 kV (r.m.s. value)/cm |
| C. | 22 kV (maximum value)/cm |
| D. | 30 kV (maximum value)/cm |
| Answer» E. | |
| 418. |
*/*_In a substation the following equipment is not installed? |
| A. | Exciters |
| B. | Series capacitors |
| C. | Shunt reactors |
| D. | Voltaire transformers |
| Answer» B. Series capacitors | |
| 419. |
*/*_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 | |
| 420. |
*/*_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 | |
| 421. |
*/*_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 | |
| 422. |
*/*_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 | |
| 423. |
*/*_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 | |
| 424. |
*/*_Electromechanical voltage regulators are generally used in? |
| A. | Reactors |
| B. | Generators |
| C. | Transformers |
| D. | All of the above |
| Answer» C. Transformers | |
| 425. |
*/*_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 | |
| 426. |
*/*_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 | |
| 427. |
*/*_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. | |
| 428. |
*/*_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. | |
| 429. |
%_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 | |
| 430. |
_ In a D.C. 3-wire distribution system, balancer fields are cross-connected in order to$? |
| A. | boost the generated voltage |
| B. | balance loads on both sides of the neutral |
| C. | make both machine^ run as unloaded motors |
| D. | equalize voltages on the positive and negative outers |
| Answer» E. | |
| 431. |
_ The operating voltage of extra high tension cables is upto$? |
| A. | 6.6 kV |
| B. | 11 kV |
| C. | 33 kV |
| D. | 66 kV |
| Answer» E. | |
| 432. |
_ There is a greater possibility of occurrence of corona during$? |
| A. | Dry weather |
| B. | Winter |
| C. | Summer heat |
| D. | Humid weather |
| Answer» E. | |
| 433. |
_ Constant voltage transmission entails the following disadvantage$? |
| A. | Large conductor area is required for same power transmission |
| B. | Short-circuit current of the system is increased |
| C. | Either of the above |
| D. | None of the above |
| Answer» C. Either of the above | |
| 434. |
_ Galvanized steel wire is generally used as$? |
| A. | Stay wire |
| B. | Earth wire |
| C. | Structural components |
| D. | All of the above |
| Answer» E. | |
| 435. |
_ Which of the following bus-bar schemes has the lowest cost?$? |
| A. | Ring bus-bar scheme |
| B. | Single bus-bar scheme |
| C. | Breaker and a half scheme |
| D. | Main and transfer scheme |
| Answer» C. Breaker and a half scheme | |
| 436. |
_ In aluminium conductors, steel core is provided to$? |
| A. | Compensate for skin effect |
| B. | Neutralise proximity effect |
| C. | Reduce line inductance |
| D. | Increase the tensile strength |
| Answer» E. | |
| 437. |
_ Large industrial consumers are supplied electrical energy at$? |
| A. | 400 V |
| B. | 11 kV |
| C. | 66 kV |
| D. | 400 kV |
| Answer» D. 400 kV | |
| 438. |
_ The wooden poles well impregnated with creosite oil or any preservative compound have life$? |
| A. | from 2 to 5 years |
| B. | 10 to 15 years |
| C. | 25 to 30 years |
| D. | 60 to 70 years |
| Answer» D. 60 to 70 years | |
| 439. |
_ Low voltage cables are meant for use up to$? |
| A. | 1.1 kV |
| B. | 3.3 kV |
| C. | 6.6 kV |
| D. | 11 kV |
| Answer» B. 3.3 kV | |
| 440. |
_ The corona is considerably affected by which of the following?$? |
| A. | Size of the conductor |
| B. | Shape of the conductor |
| C. | Surface condition of the conductor |
| D. | All of the above |
| Answer» E. | |
| 441. |
_ Which of the following methods is used for laying of underground cables?$? |
| A. | Direct laying |
| B. | Draw-in-system |
| C. | Solid system |
| D. | All of the above |
| Answer» E. | |
| 442. |
_ The current drawn by the line due to corona losses is$? |
| A. | Non-sinusoidal |
| B. | Sinusoidal |
| C. | Triangular |
| D. | Square |
| Answer» B. Sinusoidal | |
| 443. |
_ For transmission of power over a distance of 500 km, the transmission voltage should be in the range$? |
| 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 | |
| 444. |
_ The power transmitted will be maximum when$? |
| A. | Corona losses are minimum |
| B. | Reactance is high |
| C. | Sending end voltage is more |
| D. | Receiving end voltage is more |
| Answer» D. Receiving end voltage is more | |
| 445. |
_ Which of the following is the source of heat generation in the cables?$? |
| 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. | |
| 446. |
_ The cause of damage to the lead sheath of a cable is$? |
| A. | crystallisation of the lead through vibration |
| B. | chemical action on the lead when buried in the earth |
| C. | mechanical damage |
| D. | all of the above |
| Answer» E. | |
| 447. |
__When the interconnector between two stations has large reactance__ |
| A. | The transfer of power will take place with voltage fluctuation and noise |
| B. | The transfer of power will take place with least loss |
| C. | The stations will fall out of step because of large angular displacement between the stations |
| D. | None of the above |
| Answer» D. None of the above | |
| 448. |
_The steel used in steel cored conductors is usually$? |
| A. | Alloy steel |
| B. | Stainless steel |
| C. | Mild steel |
| D. | High speed steel |
| Answer» D. High speed steel | |
| 449. |
_The voltage drop, for constant voltage transmission is compensated by installing$? |
| A. | Inductors |
| B. | Capacitors |
| C. | Synchronous motors |
| D. | All of above |
| Answer» D. All of above | |
| 450. |
_Most of the high voltage transmission lines in India are$? |
| A. | Underground |
| B. | Overhead |
| C. | Either of the above |
| D. | None of the above |
| Answer» C. Either of the above | |