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.
| 451. |
_The voltage regulation in magnetic amplifier type voltage regulator is effected by$? |
| A. | Electromagnetic induction |
| B. | Varying the resistance |
| C. | Varying the reactance |
| D. | Variable transformer |
| Answer» D. Variable transformer | |
| 452. |
_In a tap changing transformer, the tapings are provided on$? |
| A. | Primary winding |
| B. | Secondary winding |
| C. | High voltage winding |
| D. | Any of the above |
| Answer» C. High voltage winding | |
| 453. |
_The material generally used for armour of high voltage cables is$? |
| A. | Aluminium |
| B. | Steel |
| C. | Brass |
| D. | Copper |
| Answer» C. Brass | |
| 454. |
_The frequency of voltage generated, in case of generators, can be increased by$? |
| A. | Using reactors |
| B. | Increasing the load |
| C. | Adjusting the governor |
| D. | Reducing the terminal voltage |
| Answer» D. Reducing the terminal voltage | |
| 455. |
_A circuit is disconnected by isolators when$? |
| A. | Line is energized |
| B. | There is no current in the line |
| C. | Line is on full load |
| D. | Circuit breaker is not open |
| Answer» C. Line is on full load | |
| 456. |
_The voltage of the single phase supply to residential consumers is$? |
| A. | 110 V |
| B. | 210 V |
| C. | 230 V |
| D. | 400 V |
| Answer» D. 400 V | |
| 457. |
_By which of the following systems electric power may be transmitted?$? |
| A. | Overhead system |
| B. | Underground system |
| C. | Both (A) and (B) |
| D. | None of the above |
| Answer» D. None of the above | |
| 458. |
_Multi-core cables generally use$? |
| A. | Square conductors |
| B. | Circular conductors |
| C. | Rectangular conductors |
| D. | None of the above |
| Answer» E. | |
| 459. |
_Which of the following relays is used on long transmission lines?$? |
| A. | Impedance relay |
| B. | Mho's relay |
| C. | Reactance relay |
| D. | None of the above |
| Answer» C. Reactance relay | |
| 460. |
_A uniformly loaded D.C. distributor is fed at both ends with equal voltages. As compared to a similar distributor fed at one end only, the drop at the middle point is$? |
| A. | One-fourth |
| B. | One-third |
| C. | One-half |
| D. | Twice |
| Answer» B. One-third | |
| 461. |
The skin effect of a conductor will reduce as the$? |
| A. | Resistivity of conductor material increases |
| B. | Permeability of conductor material increases |
| C. | Diameter increases |
| D. | Frequency increases |
| Answer» B. Permeability of conductor material increases | |
| 462. |
The underground system cannot be operated above$? |
| A. | 440 V |
| B. | 11 V |
| C. | 33 V |
| D. | 66 V |
| Answer» E. | |
| 463. |
The wooden poles well impregnated with creosote oil or any preservative compound has life$? |
| A. | From 2 to 5 years |
| B. | 10 to 15 years |
| C. | 25 to 30 years |
| D. | 60 to 70 years |
| Answer» D. 60 to 70 years | |
| 464. |
Besides a method of trial and error, which of the following methods is employed for solution of network problems in interconnected system?$? |
| A. | Circulating current method |
| B. | Thevenin's theorem |
| C. | Superposition of currents |
| D. | All of the above |
| Answer» E. | |
| 465. |
A conductor, due to sag between two supports, takes the form of$? |
| A. | Semicircle |
| B. | Triangle |
| C. | Ellipse |
| D. | Catenary |
| Answer» E. | |
| 466. |
Which of the following distribution systems is more reliable?$? |
| A. | Radial system |
| B. | Tree system |
| C. | Ring main system |
| D. | All are equally reliable |
| Answer» D. All are equally reliable | |
| 467. |
The power factor of industrial loads is generally$? |
| A. | Unity |
| B. | Lagging |
| C. | Leading |
| D. | Zero |
| Answer» C. Leading | |
| 468. |
For which of the following equipment current rating is not necessary?$? |
| A. | Circuit breakers |
| B. | Isolators |
| C. | Load break switch |
| D. | Circuit breakers and load break switches |
| Answer» C. Load break switch | |
| 469. |
310 km line is considered as$? |
| A. | A long line |
| B. | A medium line |
| C. | A short line |
| D. | Any of the above |
| Answer» B. A medium line | |
| 470. |
The material commonly used for insulation in high voltage cables is$? |
| A. | Lead |
| B. | Paper |
| C. | Rubber |
| D. | None of the above |
| Answer» C. Rubber | |
| 471. |
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 | |
| 472. |
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 | |
| 473. |
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 | |
| 474. |
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 | |
| 475. |
The power factor of industrial loads is generally? |
| A. | Unity |
| B. | Lagging |
| C. | Leading |
| D. | Zero |
| Answer» C. Leading | |
| 476. |
310 km line is considered as? |
| A. | A long line |
| B. | A medium line |
| C. | A short line |
| D. | Any of the above |
| Answer» B. A medium line | |
| 477. |
The material commonly used for insulation in high voltage cables is? |
| A. | Lead |
| B. | Paper |
| C. | Rubber |
| D. | None of the above |
| Answer» C. Rubber | |
| 478. |
Which of the following equipment, for regulating the voltage in distribution feeder, will be most economical?? |
| A. | Static condenser |
| B. | Synchronous condenser |
| C. | Tap changing transformer |
| D. | Booster transformer |
| Answer» E. | |
| 479. |
As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only |
| A. | 31.25 percent of copper |
| B. | 33.3 percent of copper |
| C. | 66.7 percent of copper |
| D. | 125 percent of copper |
| Answer» B. 33.3 percent of copper | |
| 480. |
Series capacitors on transmission lines are of little use when the load VAR requirement is |
| A. | Large |
| B. | Small |
| C. | Fluctuating |
| D. | Any of the above |
| Answer» C. Fluctuating | |
| 481. |
Overhead lines generally use |
| A. | Copper conductors |
| B. | All aluminium conductors |
| C. | A.C.S.R. conductors |
| D. | None of these |
| Answer» D. None of these | |
| 482. |
When an alternator connected to the bus-bar is shut down the bus-bar voltage will |
| A. | Fall |
| B. | Rise |
| C. | Remain unchanged |
| D. | None of the above |
| Answer» D. None of the above | |
| 483. |
Which of the following materials is used for overhead transmission lines? |
| A. | Steel cored aluminium |
| B. | Galvanised steel |
| C. | Cadmium copper |
| D. | Any of the above |
| Answer» E. | |
| 484. |
In AC.S.R. Conductors, the insulation between aluminium and steel conductors is |
| A. | Insulin |
| B. | Bitumen |
| C. | Varnish |
| D. | No insulation is required |
| Answer» E. | |
| 485. |
The spacing between phase conductors of a 220 kV line is approximately equal to |
| A. | 2 m |
| B. | 3.5 m |
| C. | 6 m |
| D. | 8.5 m |
| Answer» D. 8.5 m | |
| 486. |
In transmission lines the cross-arms are made of |
| A. | Copper |
| B. | Wood |
| C. | R.C.C. |
| D. | Steel |
| Answer» E. | |
| 487. |
The square root of the ratio of line impedance and shunt admittance is called the |
| A. | Surge impedance of the line |
| B. | Conductance of the line |
| C. | Regulation of the line |
| D. | None of the above |
| Answer» B. Conductance of the line | |
| 488. |
If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as |
| A. | Kelvin's law |
| B. | Ohm's law |
| C. | Kirchhoff's law |
| D. | Faraday's law |
| Answer» B. Ohm's law | |
| 489. |
The following system is not generally used |
| A. | 1-phase 3-wire |
| B. | 1-phase 4-wire |
| C. | 3-phase 3-wire |
| D. | 3-phase 4-wire |
| Answer» B. 1-phase 4-wire | |
| 490. |
Pin type insulators are generally not used for voltages beyond |
| A. | 1 kV |
| B. | 11 kV |
| C. | 22 kV |
| D. | 33 kV |
| Answer» E. | |
| 491. |
Which of the following materials is not used for transmission and distribution of electrical power? |
| A. | Copper |
| B. | Aluminium |
| C. | Steel |
| D. | Tungsten |
| Answer» E. | |
| 492. |
The material commonly used for sheaths of underground cables is |
| A. | Lead |
| B. | Rubber |
| C. | Copper |
| D. | Iron |
| Answer» B. Rubber | |
| 493. |
For an overhead line, the surge impedance is taken as |
| A. | 20-30 ohms |
| B. | 70-80 ohms |
| C. | 100-200 ohms |
| D. | 500-1000 ohms |
| Answer» D. 500-1000 ohms | |
| 494. |
The usual spans with R.C.C. poles are |
| A. | 40-50 meters |
| B. | 60-100 meters |
| C. | 80-100 meters |
| D. | 300-500 meters |
| Answer» D. 300-500 meters | |
| 495. |
For aluminium, as compared to copper, all the following factors have higher values except |
| A. | Specific volume |
| B. | Electrical conductivity |
| C. | Coefficient of linear expansion |
| D. | Resistance per unit length for same cross-section |
| Answer» C. Coefficient of linear expansion | |
| 496. |
By which of the following a bus-bar is rated? |
| A. | Current only |
| B. | Current and voltage |
| C. | Current, voltage and frequency |
| D. | Current, voltage, frequency and short time current |
| Answer» E. | |
| 497. |
The use of strain type insulators is made where the conductors are |
| A. | Dead ended |
| B. | At intermediate anchor towers |
| C. | Any of the above |
| D. | None of the above |
| Answer» D. None of the above | |
| 498. |
The phenomenon of rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the |
| A. | See-back effect |
| B. | Ferranti effect |
| C. | Raman effect |
| D. | None of the above |
| Answer» C. Raman effect | |
| 499. |
Which of the following regulations is considered best? |
| A. | 50 % |
| B. | 20 % |
| C. | 10 % |
| D. | 2 % |
| Answer» E. | |
| 500. |
Due to which of the following reasons the cables should not be operated too hot? |
| A. | The oil may loose its viscosity and it may start drawing off from higher levels |
| B. | Expansion of the oil may cause the sheath to burst |
| C. | Unequal expansion may create voids in the insulation which will lead to ionization |
| D. | All of the above |
| Answer» E. | |