MCQOPTIONS
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MCQOPTIONS
This section includes 147 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Maxwell’s inductance capacitance bridge is used for measurement of inductance o |
| A. | low Q coils |
| B. | medium Q coils |
| C. | high Q coils |
| D. | low and medium Q coils |
| Answer» B. medium Q coils | |
| 52. |
Frequency can be measured by using |
| A. | Maxwell’s Bridge |
| B. | Schering Bridge |
| C. | Heaviside Campbell bridge |
| D. | Wein’s bridge |
| Answer» E. | |
| 53. |
The following is the range of power consumption in PMMC instrument |
| A. | 0.25W to 2W |
| B. | 0.25mW to 2mW |
| C. | 25μW to 200μW |
| D. | 2W to 3W |
| Answer» D. 2W to 3W | |
| 54. |
The transfer function of an integral compensator is given by |
| A. | 1/s |
| B. | 1/s2 |
| C. | k/s |
| D. | None of the above |
| Answer» D. None of the above | |
| 55. |
The following law is synonymous to the occurrence of diamagnetism |
| A. | Gauss’s law |
| B. | Lenz’s law |
| C. | Maxwell’s law |
| D. | Kirchoff’s law |
| Answer» C. Maxwell’s law | |
| 56. |
The ratio of charge stand by two metallic spheres raised to the same potential is 6. The ratio of the surfaces areas of the spheres is |
| A. | 6 |
| B. | 1/6 |
| C. | 1/√6 |
| D. | 36 |
| Answer» B. 1/6 | |
| 57. |
If V=a+jb and I=c+jd, then power is given by |
| A. | ac+ad |
| B. | ac+bd |
| C. | bc-ad |
| D. | bc+ad |
| Answer» C. bc-ad | |
| 58. |
Two heaters of rating 1KW, 250V are connected in series across 250V supply, the power taken by the heaters will be |
| A. | 2 KW |
| B. | ¼ KW |
| C. | ½ KW |
| D. | 1 KW |
| Answer» D. 1 KW | |
| 59. |
The capacitance of a parallel plate capacitor increases with |
| A. | larger plate area and shorter distance between plates |
| B. | smaller plate area and shorter distance between plates |
| C. | smaller plate area and higher applied voltage |
| D. | larger plate area, larger distance between plates and higher applied voltages |
| Answer» B. smaller plate area and shorter distance between plates | |
| 60. |
The power consumed by an electrical device is 1000W at 250V. What is the resistance in the device? |
| A. | 60 ohm |
| B. | 250000 ohm |
| C. | 4 ohm |
| D. | 62.5 ohm |
| Answer» E. | |
| 61. |
In a series parallel circuit, any two resistances in the same current path must be in |
| A. | series with each other |
| B. | parallel with each other |
| C. | series with the voltage source.’ |
| D. | parallel with the voltage source |
| Answer» B. parallel with each other | |
| 62. |
Maximum demand on the power system is |
| A. | Sum of the maximum demands of all its consumers |
| B. | Greatest average load in a specified time. |
| C. | Peak value of load in a specified time |
| D. | All of the above. |
| Answer» C. Peak value of load in a specified time | |
| 63. |
What is the result of the product of diversity factor and maximum demand? |
| A. | Average demand |
| B. | Sum of consumers maximum demand |
| C. | Installed capacity |
| D. | Generated power |
| Answer» C. Installed capacity | |
| 64. |
A large diversity factor of the load in a power system |
| A. | Reduces the installation cost. |
| B. | Increases the installation cost. |
| C. | Does not affect the installation cost |
| D. | None of the above |
| Answer» B. Increases the installation cost. | |
| 65. |
Diversity factor is helpful in computing which of the following factors? |
| A. | Plant capacity |
| B. | Average load |
| C. | Units generated (kWh) |
| D. | Peak demand |
| Answer» B. Average load | |
| 66. |
What is operating value of diversity factor? |
| A. | Greater than unity |
| B. | Less than unity |
| C. | Always more than unity |
| D. | Normally more than unity |
| Answer» B. Less than unity | |
| 67. |
What is the diversity factor? |
| A. | A ratio of kWh generated to the product of plant capacity and the number of hours for which the plant is in operation. |
| B. | The ratio of sum of individual maximum demands to the maximum demand on power stations. |
| C. | The ratio of actual energy produced to the maximum possible energy. |
| D. | The ratio of maximum demand on the power station to the connected load. |
| Answer» C. The ratio of actual energy produced to the maximum possible energy. | |
| 68. |
In a power station, the cost of generation of power reduces most effectively when _______________. |
| A. | Diversity factor alone increases. |
| B. | Both diversity factor and load factor increases |
| C. | Only load factor increases. |
| D. | Both diversity factor and load factor decreases. |
| Answer» C. Only load factor increases. | |
| 69. |
A thermal generating station has a installed capacity of 15 MW and supplies a daily load of 10 Mw for 12 hours and 5 MW for remaining 12 hours. The plant capacity factor for this station is _______. |
| A. | 1 |
| B. | 0.75 |
| C. | 0.67 |
| D. | 0.5 |
| Answer» E. | |
| 70. |
Capacity factor will be very low when the power plant _________________. |
| A. | is operated as base load plant. |
| B. | is operated for supplying base load as well as the peak loads |
| C. | is operated in emergency only. |
| D. | is under maintainance. |
| Answer» D. is under maintainance. | |
| 71. |
What is the plant capacity factor? |
| A. | A ratio of kWh generated to the product of plant capacity and the number of hours for which the plant is in operation. |
| B. | The ratio of sum of individual maximum demands to the maximum demand on power stations |
| C. | The ratio of actual energy produced to the maximum possible energy. |
| D. | The ratio of maximum demand on the power station to the connected load. |
| Answer» D. The ratio of maximum demand on the power station to the connected load. | |
| 72. |
An industrial consumer has a load pattern of 2000 kW 0.8 lag for 12 hours and 1000 kW unity power factor for 12 hours. What is the load factor? |
| A. | 0.5 |
| B. | 0.55 |
| C. | . 0.6 |
| D. | 0.75 |
| Answer» E. | |
| 73. |
The load factor plays a key role in determining which among the following? |
| A. | Plant capacity |
| B. | Overall cost per unit generated |
| C. | Overall demand |
| D. | Both (a) and (c) |
| Answer» C. Overall demand | |
| 74. |
What is the load factor of a power plant? |
| A. | Greater than unity |
| B. | Less than unity |
| C. | Always more than unity |
| D. | Normally more than unity |
| Answer» C. Always more than unity | |
| 75. |
What is a load factor? |
| A. | The ratio of average to maximum demand |
| B. | The ratio of maximum demand to average load |
| C. | The product of maximum demand and average load. |
| D. | The ratio of average load to the plant capacity. |
| Answer» B. The ratio of maximum demand to average load | |
| 76. |
What does the chronological load curve indicate? |
| A. | Variation in demand factor during 24 hours. |
| B. | Variation of demand from instant to instant during 24 hour. |
| C. | The total energy consumed upto different times of the day. |
| D. | The total number of hours for which a particular load lasts during the day. |
| Answer» C. The total energy consumed upto different times of the day. | |
| 77. |
Maximum and Minimum loads on the load duration curve is represented on which respective side? |
| A. | Left and Right |
| B. | Right and Left. |
| C. | Randomly. |
| D. | None of these. |
| Answer» B. Right and Left. | |
| 78. |
What is the shape of the load duration curve? |
| A. | Rectangular shape |
| B. | Triangular shape |
| C. | Parabolic shape |
| D. | Free hand sketch |
| Answer» D. Free hand sketch | |
| 79. |
What does a load duration curve represent? |
| A. | The variation of load during different hours of the day |
| B. | Average load |
| C. | The number of hours for which a particular lasts during the day |
| D. | None of the above |
| Answer» D. None of the above | |
| 80. |
The mass curve is plotted from which of the following curve? |
| A. | Chronological curve |
| B. | Energy load curve |
| C. | Load duration curve |
| D. | None of these |
| Answer» D. None of these | |
| 81. |
What does a mass curve represent? |
| A. | Average load |
| B. | The total energy consumed by the load upto a particular time in a day |
| C. | The number of hours for which a particular lasts during the day |
| D. | The variation of load during different hours of the day |
| Answer» C. The number of hours for which a particular lasts during the day | |
| 82. |
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 | |
| 83. |
Load curve of a generation is always |
| A. | Positive slope |
| B. | Zero slope |
| C. | Negative slope |
| D. | Combination of (a), (b) and (c) |
| Answer» E. | |
| 84. |
What does the highest point on the daily load curve represent? |
| A. | Peak load |
| B. | Maximum demand |
| C. | Both (a) & (d) |
| D. | None of these |
| Answer» C. Both (a) & (d) | |
| 85. |
What does the area under the load curve represent? |
| A. | System voltage |
| B. | Current |
| C. | Energy consumed |
| D. | Maximum demand |
| Answer» D. Maximum demand | |
| 86. |
What is a load curve? |
| A. | A plot of load vs current. |
| B. | A plot of load vs time. |
| C. | A plot of load vs duration of time |
| D. | Total number of units generated vs time. |
| Answer» C. A plot of load vs duration of time | |
| 87. |
In geo thermal power plants waste water is |
| A. | Discharged back to earth. |
| B. | Discharged into the sea. |
| C. | Recirculated after cooling in cooling towers. |
| D. | Evaporated in ponds |
| Answer» B. Discharged into the sea. | |
| 88. |
Presence of non – condensable gasses in a geo – pressured water causes |
| A. | Pollution problem |
| B. | Corrosion problem |
| C. | Flow problem |
| D. | All of the above |
| Answer» E. | |
| 89. |
Pugga valley in Ladakh is suitable for which among the following power generation? |
| A. | Solar |
| B. | Geo thermal |
| C. | Wind |
| D. | None of these |
| Answer» C. Wind | |
| 90. |
The potential of developing tidal power in India is in |
| A. | Kutch |
| B. | Ran |
| C. | San joe |
| D. | Severn |
| Answer» B. Ran | |
| 91. |
In a circuit breaker the contact space is ionised by what? |
| A. | Field emission from the contact surface |
| B. | Thermal emission from the contact surface. |
| C. | Thermal ionisation of gas |
| D. | All of above |
| Answer» D. All of above | |
| 92. |
In a circuit breaker, ionisation is facilitated by_________________. |
| A. | Increase in field strength. |
| B. | Increase in mean free length. |
| C. | High temperature of the surrounding medium. |
| D. | All of the above |
| Answer» E. | |
| 93. |
Which of the following should have low value for the contacts and their material? |
| A. | Thermal capacity. |
| B. | Contact resistance. |
| C. | Thermal conductivity |
| D. | None of above. |
| Answer» C. Thermal conductivity | |
| 94. |
The heat produced at the contact point owing to flow of electric current is least affected by_____________________. |
| A. | Temperature of the surrounding medium. |
| B. | Contact resistance. |
| C. | Magnitude of electric current flowing. |
| D. | Duration of flow of current. |
| Answer» B. Contact resistance. | |
| 95. |
The resistance of an electric arc can be increased by |
| A. | Increasing the concentration of ionised particles. |
| B. | Reducing the arc length. |
| C. | Splitting the arc. |
| D. | Increasing the arc cross section. |
| Answer» D. Increasing the arc cross section. | |
| 96. |
By using low resistance method for arc extension what is the value of arc resistance? |
| A. | Arc resistance is zero |
| B. | Arc resistance is high |
| C. | Arc resistance is low |
| D. | Arc resistance is very high |
| Answer» D. Arc resistance is very high | |
| 97. |
What happens in the arc extinction using high resistance method? |
| A. | Arc resistance is decreased with time |
| B. | Arc resistance is increased with time |
| C. | No change it remains same. |
| D. | Arc resistance is kept zero |
| Answer» C. No change it remains same. | |
| 98. |
What is the arc voltage in a circuit breaker? |
| A. | In phase with the arc current. |
| B. | Lagging the arc current by 90° |
| C. | . Leading the arc current by 90° |
| D. | Lagging the arcing current by 180° |
| Answer» B. Lagging the arc current by 90° | |
| 99. |
Arcing voltage will be the least in case of |
| A. | Carbon |
| B. | Copper |
| C. | Silver |
| D. | Tungsten |
| Answer» D. Tungsten | |
| 100. |
How is the initiation of electric arc at the instant of contact separation caused? |
| A. | Thermionic emission of electrons. |
| B. | Field emission of electrons. |
| C. | Both (a) and (b) |
| D. | None of these. |
| Answer» D. None of these. | |