MCQOPTIONS
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MCQOPTIONS
This section includes 715 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 601. |
In a fuel cell, cathode is of |
| A. | Oxygen |
| B. | Ammonia |
| C. | Hydrogen |
| D. | Carbon monoxide |
| Answer» D. Carbon monoxide | |
| 602. |
In a distribution system, which of the following items shares the major cost? |
| A. | Conductors |
| B. | Earthing systems |
| C. | Distribution transformer |
| D. | Insulators |
| Answer» D. Insulators | |
| 603. |
In a dc 3 wire distributor using having unequal loads on the two sides |
| A. | Both balancers operate as generators. |
| B. | Both balancers operate as motors. |
| C. | Balancers connected to the lightly loaded sides operate as a generator. |
| D. | Balancers connected to the heavily loaded sides operate as a generator. |
| Answer» E. | |
| 604. |
In a boiler installation the natural draught is produced_____________? |
| A. | due to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in |
| B. | due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column |
| C. | due to the fact that at the chimney top the pressure is more than its environmental pressure |
| D. | all of the above |
| Answer» C. due to the fact that at the chimney top the pressure is more than its environmental pressure | |
| 605. |
In a balanced 3 phase, 4 wire ac system the phase sequence is RYB. If the voltage of R phase = 230 ∠ 0° volts, then what will be the B phase? |
| A. | 230 ∠ - 120° |
| B. | 230 ∠ - 90° |
| C. | 230 ∠ - 90° |
| D. | 230 ∠ - 120° |
| Answer» B. 230 ∠ - 90° | |
| 606. |
In a 3 core cable, the capacitance between two conductors is 3 μF. What will be the capacitance per phase? |
| A. | 1.5 μ F |
| B. | 3 μ F |
| C. | 6 μ F |
| D. | 12 μ F |
| Answer» D. 12 μ F | |
| 607. |
In a 2 stroke engine, the operation cycle are completed in how many strokes and revolution? |
| A. | 4 strokes and 2 revolutions |
| B. | 2 stroke and 2 revolutions |
| C. | 2 strokes and 1 revolution |
| D. | 4 stroke and 4 revolutions |
| Answer» D. 4 stroke and 4 revolutions | |
| 608. |
If the voltage of the system is about 230 V, then what would be the highest and the lowest permissible voltage? |
| A. | 242 and 214 V |
| B. | 240 and 210 V |
| C. | 244 and 216 V |
| D. | 244 and 212 V |
| Answer» D. 244 and 212 V | |
| 609. |
If the load factor of a power station is high then its cost of generation will be_______? |
| A. | High |
| B. | Low |
| C. | Remain same |
| D. | Depend upon plant type |
| Answer» B. Low | |
| 610. |
If the double circuit 3 phase line has conductors of diameter 2 cm and distance of separation 2m in hexagonal spacing. What is the phase to neutral capacitance for 150 km of line? |
| A. | 2.4939 μ F |
| B. | 3.7408 μ F |
| C. | 1.8245 μ F |
| D. | 3.2548 μ F |
| Answer» C. 1.8245 μ F | |
| 611. |
If the diversity factor of a power station is high then its generation cost is___________? |
| A. | high |
| B. | low |
| C. | remain same |
| D. | depend on the plan type |
| Answer» C. remain same | |
| 612. |
If the daily load curve is divided by 24, what does this curve represent? |
| A. | Average load for the day |
| B. | Connected load |
| C. | Maximum demand |
| D. | Demand factor |
| Answer» B. Connected load | |
| 613. |
If a 132 kV line passes over a residential building, what shall be the minimum vertical clearance from the roof of the building? |
| A. | 3 m. |
| B. | 4.57 m. |
| C. | 6.38 m. |
| D. | 9.27 m. |
| Answer» C. 6.38 m. | |
| 614. |
How many cores are used in a cable for the transmission of voltages upto 66 kV? |
| A. | Single core |
| B. | Two core |
| C. | Three core |
| D. | All of the above |
| Answer» D. All of the above | |
| 615. |
Hot template curves are a plot between |
| A. | Temperature and humidity |
| B. | Conductors sag and span lengths |
| C. | Conductor weight and sag |
| D. | None of these |
| Answer» C. Conductor weight and sag | |
| 616. |
Higher the frequency, _____________. |
| A. | Lower the corona loss |
| B. | Higher is the corona loss |
| C. | Does not effect |
| D. | Depends on the physical conditions |
| Answer» C. Does not effect | |
| 617. |
High output diesel engines are started by |
| A. | self starter. |
| B. | compressed air. |
| C. | battery. |
| D. | cranking. |
| Answer» C. battery. | |
| 618. |
Heating value of diesel is around _________. |
| A. | 4000 kcal/kg |
| B. | 10000 kcal/kg |
| C. | 15000 kcal/kg |
| D. | 20000 kcal/kg |
| Answer» C. 15000 kcal/kg | |
| 619. |
Greater the power factor the ________________ is the volume of copper required. |
| A. | Greater |
| B. | Smaller |
| C. | Both are equal |
| D. | Depending of the level of transmission |
| Answer» C. Both are equal | |
| 620. |
Generators for the base load plants are usually designed for maximum efficiency around |
| A. | 20% overload |
| B. | Full load |
| C. | 75% full load |
| D. | None of these |
| Answer» C. 75% full load | |
| 621. |
Gas turbine plants are not used ___________. |
| A. | as peak load plants. |
| B. | as base load plants. |
| C. | as standby power plants. |
| D. | in combination with the steam power plants |
| Answer» C. as standby power plants. | |
| 622. |
Galloping in transmission line conductors arises due to |
| A. | Asymmetrical layers of ice formation. |
| B. | Vortex phenomenon in light winds. |
| C. | Heavy weight of the line conductors. |
| D. | Adoption of horizontal conductor configuration. |
| Answer» B. Vortex phenomenon in light winds. | |
| 623. |
For which among the following consumers is penalty imposed for low power factor? |
| A. | Residential and commercial consumers. |
| B. | Industrial consumers |
| C. | Agricultural consumers |
| D. | All of the above |
| Answer» C. Agricultural consumers | |
| 624. |
For the same draught produced the power of induced draught fan as compared to forced draught fan is___________? |
| A. | less |
| B. | more |
| C. | same |
| D. | not predictable |
| Answer» C. same | |
| 625. |
For the same conductor length, same amount of power, same losses and maximum voltage to earth, which system requires minimum conductor area? |
| A. | 3 wire ac |
| B. | 2 wire ac |
| C. | 2 wire dc |
| D. | Single phase |
| Answer» B. 2 wire ac | |
| 626. |
For the safety of a steam boiler the number of safety valves fitted are____________? |
| A. | four |
| B. | three |
| C. | two |
| D. | one |
| Answer» D. one | |
| 627. |
For the induced draught the fan is located_______________? |
| A. | near bottom of chimney |
| B. | near bottom of furnace |
| C. | at the top of the chimney |
| D. | anywhere permissible |
| Answer» B. near bottom of furnace | |
| 628. |
For satellites the source of energy is |
| A. | Solar cell |
| B. | Fuel cells |
| C. | Edison cells |
| D. | Cryogenic storage |
| Answer» B. Fuel cells | |
| 629. |
For purely domestic loads which type of distribution is employed? |
| A. | Single phase two wire |
| B. | 3 phase 3 wire |
| C. | 3 phase 4 wire |
| D. | None of these |
| Answer» B. 3 phase 3 wire | |
| 630. |
For Parson’s reaction steam turbine, degree of reaction is____________? |
| A. | 75% |
| B. | 100% |
| C. | 50% |
| D. | 60% |
| Answer» D. 60% | |
| 631. |
For high voltage transmission lines, why are conductors suspended from towers? |
| A. | Increase the clearance from ground. |
| B. | Reduce clearance from ground. |
| C. | Take care of increase in length. |
| D. | Reduce the environmental effects. |
| Answer» B. Reduce clearance from ground. | |
| 632. |
For forced draught system, the function of chimney is mainly_____________? |
| A. | to produce draught to accelerate the combustion of fuel |
| B. | to discharge gases high up in the atmosphere to avoid hazard |
| C. | to reduce the temperature of the hot gases discharged |
| D. | none of the above |
| Answer» C. to reduce the temperature of the hot gases discharged | |
| 633. |
For a transmission line which among the following relation is true? |
| A. | –AB + CD = 1 |
| B. | AD + BC = 1 |
| C. | AB – CD = -1 |
| D. | –AD + BC = 1 |
| Answer» E. | |
| 634. |
For a short line if the receiving end voltage is equal to sending end voltage under loaded conditions |
| A. | The sending end power factor is unity. |
| B. | The receiving end power factor is unity. |
| C. | The sending end power factor is leading. |
| D. | The receiving end power factor is leading. |
| Answer» E. | |
| 635. |
For a nuclear plant, what is its useful life? |
| A. | 10 years |
| B. | 30 years |
| C. | 100 years |
| D. | 60 years |
| Answer» C. 100 years | |
| 636. |
For a consumer what is the most economical power factor? |
| A. | 0.25 – 0.5 lagging |
| B. | 0.25 – 0.5 leading |
| C. | 0.85 – 0.95 lagging |
| D. | 0.85 – 0.95 leading |
| Answer» D. 0.85 – 0.95 leading | |
| 637. |
Fixed charge is dependent on what factor? |
| A. | Energy consumption |
| B. | Maximum demand |
| C. | Peak load demand |
| D. | All of the above |
| Answer» C. Peak load demand | |
| 638. |
Example of overfeed type stoker is___________? |
| A. | chain grate |
| B. | spreader |
| C. | travelling grate |
| D. | all of the above |
| Answer» E. | |
| 639. |
Evaporative type of condenser has___________? |
| A. | steam in pipes surrounded by water |
| B. | water in pipes surrounded by steam |
| C. | either A. or (b) |
| D. | none of the above |
| Answer» B. water in pipes surrounded by steam | |
| 640. |
Edward’s air pump____________? |
| A. | removes air and also vapour from condenser |
| B. | removes only air from condenser |
| C. | removes only un-condensed vapour from condenser |
| D. | removes air alongwith vapour and also the condensed water from condenser |
| Answer» E. | |
| 641. |
Economisers improve boiler efficiency by__________? |
| A. | 1 to 5% |
| B. | 4 to 10% |
| C. | 10 to 12% |
| Answer» C. 10 to 12% | |
| 642. |
Economiser is used to heat_____________? |
| A. | air |
| B. | feed water |
| C. | flue gases |
| D. | all above |
| Answer» C. flue gases | |
| 643. |
Each disc in a suspension type of insulators is designed for what voltage? |
| A. | 33 kV |
| B. | 22 kV |
| C. | 11 kV |
| D. | 66 kV |
| Answer» C. 11 kV | |
| 644. |
Domestic consumers are charged _____________. |
| A. | Flat demand tariff |
| B. | Block rate tariff |
| C. | Flat rate tariff |
| D. | Off peak tariff |
| Answer» C. Flat rate tariff | |
| 645. |
Direct conversion of heat energy into electrical energy is possible through |
| A. | MHD generators |
| B. | Fuel or solar cells |
| C. | Thermionic converters |
| D. | Both (a) and (c) |
| E. | None of these |
| Answer» E. None of these | |
| 646. |
Diesel power plant are generally used as___________? |
| A. | peak load plant |
| B. | base load plant |
| C. | standby plant |
| D. | none of the above |
| Answer» B. base load plant | |
| 647. |
Determine the average demand of a plant if its load factor and maximum demand are 0.60 and 30 MW. |
| A. | 20 MW |
| B. | 18 MW |
| C. | 50 MW |
| D. | 13 MW |
| Answer» C. 50 MW | |
| 648. |
Depreciation charge may be based on which method? |
| A. | Straight line method. |
| B. | Sinking fund method. |
| C. | Both (a) & (b). |
| D. | None of these. |
| Answer» D. None of these. | |
| 649. |
Demand factor is defined as___________? |
| A. | average load/maximum load |
| B. | maximum demand/connected load |
| C. | connected load/maximum demand |
| D. | average load x maximum load |
| Answer» C. connected load/maximum demand | |
| 650. |
Deaerative heating is done to_____________? |
| A. | heat the water |
| B. | heat the air in the water |
| C. | remove dissolved gases in the water |
| Answer» D. | |