MCQOPTIONS
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MCQOPTIONS
This section includes 106 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.
| 51. |
The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature co-efficient of the filament is___________________? |
| A. | zero |
| B. | negative |
| C. | positive |
| D. | about 2 ohms per degree |
| Answer» D. about 2 ohms per degree | |
| 52. |
The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true_______________? |
| A. | The current through each bulb in same |
| B. | The voltage across each bulb is not same |
| C. | The power dissipation in each bulb is not same |
| D. | None of the above |
| Answer» B. The voltage across each bulb is not same | |
| 53. |
The filament of an electric bulb is made of______________? |
| A. | carbon |
| B. | aluminium |
| C. | tungsten |
| D. | nickel |
| Answer» D. nickel | |
| 54. |
The condition for the validity under Ohm’s law is that_______________? |
| A. | resistance must be uniform |
| B. | current should be proportional to the size of the resistance |
| C. | resistance must be wire wound type |
| D. | temperature at positive end should be more than the temperature at negative end |
| Answer» B. current should be proportional to the size of the resistance | |
| 55. |
Resistance of a material always decreases if___________? |
| A. | temperature of material is decreased |
| B. | temperature of material is increased |
| C. | number of free electrons available become more |
| D. | none of the above is correct |
| Answer» D. none of the above is correct | |
| 56. |
Out of the following which is not a poor conductor__________? |
| A. | Cast iron |
| B. | Copper |
| C. | Carbon |
| D. | Tungsten |
| Answer» C. Carbon | |
| 57. |
Out of the following which is an insulating material____________? |
| A. | Copper |
| B. | Gold |
| C. | Silver |
| D. | Paper |
| Answer» E. | |
| 58. |
One newton meter is same as_____________? |
| A. | one watt |
| B. | one joule |
| C. | five joules |
| D. | one joule second |
| Answer» C. five joules | |
| 59. |
Ohm’s law is not applicable to__________? |
| A. | semi-conductors |
| B. | D. C. circuits |
| C. | small resistors |
| D. | high currents |
| Answer» B. D. C. circuits | |
| 60. |
Ohm’s law is not applicable to____________? |
| A. | vacuum tubes |
| B. | carbon resistors |
| C. | high voltage circuits |
| D. | circuits with low current densities |
| Answer» B. carbon resistors | |
| 61. |
Nichrome wire is an alloy of_____________? |
| A. | lead and zinc |
| B. | chromium and vanadium |
| C. | nickel and chromium |
| D. | copper and silver |
| Answer» D. copper and silver | |
| 62. |
Magnetic flux has the unit of |
| A. | Newton |
| B. | Ampere-turn |
| C. | Weber |
| D. | Tesla |
| Answer» D. Tesla | |
| 63. |
It becomes more difficult to remove_________________? |
| A. | any electron from the orbit |
| B. | first electron from the orbit |
| C. | second electron from the orbit |
| D. | third electron from the orbit |
| Answer» E. | |
| 64. |
International ohm is defined in terms of the resistance of________________? |
| A. | a column of mercury |
| B. | a cube of carbon |
| C. | a cube of copper |
| D. | the unit length of wire |
| Answer» B. a cube of carbon | |
| 65. |
Internal resistance of ideal voltage source is ? |
| A. | zero |
| B. | infinite |
| C. | finite |
| D. | 100 ohms |
| Answer» B. infinite | |
| 66. |
Internal resistance of ideal current source is ? |
| A. | zero |
| B. | infinite |
| C. | finite |
| D. | 100 ohms |
| Answer» C. finite | |
| 67. |
Insulating materials have the function of______________? |
| A. | preventing a short circuit between conducting wires |
| B. | preventing an open circuit between the voltage source and the load |
| C. | conducting very large currents |
| D. | storing very high currents |
| Answer» B. preventing an open circuit between the voltage source and the load | |
| 68. |
Insulating materials have the function of___________? |
| A. | preventing a short circuit between conducting wires |
| B. | preventing an open circuit between the voltage source and the load |
| C. | conducting very large currents |
| D. | storing very high currents |
| Answer» C. conducting very large currents | |
| 69. |
Instantaneous power in inductor is proportional to the |
| A. | product of the instantaneous current and rate of change of current |
| B. | square of instantaneous current |
| C. | square of the rate of change of current |
| D. | Temperature of the inductor |
| Answer» B. square of instantaneous current | |
| 70. |
Inductor does not allow the sudden change of |
| A. | current |
| B. | voltage |
| C. | power |
| D. | None of the above |
| Answer» B. voltage | |
| 71. |
In the case of direct current____________? |
| A. | magnitude and direction of current remains constant |
| B. | magnitude and direction of current changes with time |
| C. | magnitude of current changes with time |
| D. | magnitude of current remains constant |
| Answer» B. magnitude and direction of current changes with time | |
| 72. |
In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains______________? |
| A. | length of heating element should be decreased |
| B. | length of heating element should be increased |
| C. | length of heating element has no effect on heating if water |
| D. | none of the above |
| Answer» B. length of heating element should be increased | |
| 73. |
In a series circuit with unequal resistances______________? |
| A. | the highest resistance has the most of the current through it |
| B. | the lowest resistance has the highest voltage drop |
| C. | the lowest resistance has the highest current |
| D. | the highest resistance has the highest voltage drop |
| Answer» E. | |
| 74. |
In a lamp load when more than one lamp are switched on the total resistance of the load_____________? |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | none of the above |
| Answer» C. remains same | |
| 75. |
If the efficiency of a machine is to be high, what should be low __________? |
| A. | Input power |
| B. | Losses |
| C. | True component of power |
| D. | kWh consumed |
| E. | Ratio of output to input |
| Answer» C. True component of power | |
| 76. |
If/, R and t are the current, resistance and time respectively, then according to Joule’s law heat produced will be proportional to_______________? |
| A. | I2Rt |
| B. | I2Rf |
| C. | I2R2t |
| D. | I2R2t* |
| Answer» B. I2Rf | |
| 77. |
If P is the power of a star connected system then what will be power of an equivalent delta connected system? |
| A. | P |
| B. | 3P |
| C. | P/3 |
| D. | None of the above |
| Answer» C. P/3 | |
| 78. |
If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes______________? |
| A. | 0.4 ohm |
| B. | 0.6 ohm |
| C. | 0.8 ohm |
| D. | 1.0 ohm |
| Answer» B. 0.6 ohm | |
| 79. |
If a parallel circuit is opened in the main line, the current_______________? |
| A. | increases in the branch of the lowest resistance |
| B. | increases in each branch |
| C. | is zero in all branches |
| D. | is zero in the highest resistive branch |
| Answer» D. is zero in the highest resistive branch | |
| 80. |
If 1 A current flows in a circuit, the number of electrons flowing through this circuit is |
| A. | 0.625 × 10¹⁹ |
| B. | 1.6 × 10¹⁹ |
| C. | 1.6 × 10⁻¹⁹ |
| D. | 0.625 × 10⁻¹⁹ |
| Answer» B. 1.6 × 10¹⁹ | |
| 81. |
How many coulombs of charge flow through a circuit carrying a current of 10 A in 1 minute? |
| A. | 10 |
| B. | 60 |
| C. | 600 |
| D. | 1200 |
| Answer» D. 1200 | |
| 82. |
Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 25 Q. If the same four wires are connected is series the effective resistance will be________? |
| A. | 100 Ω |
| B. | 200 Ω |
| C. | 300 Ω |
| D. | 400 Ω |
| Answer» E. | |
| 83. |
For which of the following ‘ampere second’ could be the unit ? |
| A. | Reluctance |
| B. | Charge |
| C. | Power |
| D. | Energy |
| Answer» C. Power | |
| 84. |
For testing appliances, the wattage of test lamp should be_____________? |
| A. | very low |
| B. | low |
| C. | high |
| D. | any value |
| Answer» D. any value | |
| 85. |
Electric pressure is also called________? |
| A. | resistance |
| B. | power |
| C. | voltage |
| D. | energy |
| Answer» D. energy | |
| 86. |
Electric current passing through the circuit produces_____________? |
| A. | magnetic effect |
| B. | luminous effect |
| C. | thermal effect |
| D. | chemical effect |
| E. | all above effects |
| Answer» F. | |
| 87. |
Current velocity through a copper conductor is___________? |
| A. | the same as propagation velocity of electric energy |
| B. | independent of current strength |
| C. | of the order of a few ^.s/m |
| D. | nearly 3 x 108 m/s |
| Answer» D. nearly 3 x 108 m/s | |
| 88. |
Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________? |
| A. | 1/9 times |
| B. | 3 times |
| C. | 9 times |
| D. | unchanged |
| Answer» D. unchanged | |
| 89. |
Conductance : mho :: ____________? |
| A. | resistance : ohm |
| B. | capacitance : henry |
| C. | inductance : farad |
| D. | lumen : steradian |
| Answer» B. capacitance : henry | |
| 90. |
Conductance is reciprocal of____________? |
| A. | resistance |
| B. | inductance |
| C. | reluctance |
| D. | capacitance |
| Answer» B. inductance | |
| 91. |
Capacitor does not allow the sudden change of ? |
| A. | current |
| B. | voltage |
| C. | power |
| D. | None of the above |
| Answer» C. power | |
| 92. |
Bulbs in street lighting are all connected in_____________? |
| A. | parallel |
| B. | series |
| C. | series-parallel |
| D. | end-to-end |
| Answer» B. series | |
| 93. |
are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators______________? |
| A. | Varistors |
| B. | Thermistor |
| C. | Semi-conductors |
| D. | Variable resistors |
| Answer» D. Variable resistors | |
| 94. |
An open resistor, when checked with an ohm-meter reads_____________? |
| A. | zero |
| B. | infinite |
| C. | high but within tolerance |
| D. | low but not zero |
| Answer» C. high but within tolerance | |
| 95. |
An instrument which detects electric current is known as_____________? |
| A. | voltmeter |
| B. | rheostat |
| C. | wattmeter |
| D. | galvanometer |
| Answer» E. | |
| 96. |
An electric filament bulb can be worked from____________? |
| A. | D. C. supply only |
| B. | A. C. supply only |
| C. | Battery supply only |
| D. | All above |
| Answer» E. | |
| 97. |
All of the following are equivalent to watt except_____________? |
| A. | (amperes) ohm |
| B. | joules/seC. |
| C. | amperes x volts |
| D. | amperes/volt |
| Answer» E. | |
| 98. |
All good conductors have high____________? |
| A. | conductance |
| B. | resistance |
| C. | reluctance |
| D. | thermal conductivity |
| Answer» B. resistance | |
| 99. |
A thermistor has_____________? |
| A. | positive temperature coefficient |
| B. | negative temperature coefficient |
| C. | zero temperature coefficient |
| D. | variable temperature coefficient |
| Answer» D. variable temperature coefficient | |
| 100. |
A substance whose molecules consist of dissimilar atoms is called____________? |
| A. | semi-conductor |
| B. | super-conductor |
| C. | compound |
| D. | insulator |
| Answer» D. insulator | |