MCQOPTIONS
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MCQOPTIONS
This section includes 143 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. |
Bulbs in street lighting are all connected in |
| A. | parallel |
| B. | series |
| C. | series-parallel |
| D. | end-to-end |
| Answer» B. series | |
| 52. |
Resistance of carbon filament lamp as the applied voltage increases. |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | none of the above |
| Answer» C. remains same | |
| 53. |
When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is |
| A. | A.C. |
| B. | D.C. |
| C. | any of above two |
| D. | none of the above |
| Answer» C. any of above two | |
| 54. |
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 | |
| 55. |
Resistance of 220 V, 100 W lamp will be |
| A. | 4.84 Q |
| B. | 48.4 Q |
| C. | 484 ft |
| D. | 4840 Q |
| Answer» D. 4840 Q | |
| 56. |
Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct ? |
| A. | 100 W lamp will brighter |
| B. | 40 W lamp will glow brighter |
| C. | Both lamps will glow equally bright |
| D. | 40 W lamp will fuse |
| Answer» C. Both lamps will glow equally bright | |
| 57. |
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 | |
| 58. |
When one leg of parallel circuit is opened out the total current will |
| A. | reduce |
| B. | increase |
| C. | decrease |
| D. | become zero |
| Answer» D. become zero | |
| 59. |
It becomes more difficult to remove |
| A. | any electron from the |
| B. | first electron from the orbit |
| C. | second electron from the orbit |
| D. | third electron from the orbit |
| Answer» E. | |
| 60. |
Whether circuit may be AC. or D.C. one, following is most effective in reducing the magnitude of the current. |
| A. | Reactor |
| B. | Capacitor |
| C. | Inductor |
| D. | Resistor |
| Answer» E. | |
| 61. |
A glass rod when rubbed with silk cloth is charged because |
| A. | it takes in proton |
| B. | its atoms are removed |
| C. | it gives away electrons |
| D. | it gives away positive charge |
| Answer» D. it gives away positive charge | |
| 62. |
Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as |
| A. | 4 : 25 |
| B. | 25 : 4 |
| C. | 2 : 5 |
| D. | 5 : 2 |
| Answer» D. 5 : 2 | |
| 63. |
When electric current passes through a metallic conductor, its temperature rises. This is due to |
| A. | collisions between conduction electrons and atoms |
| B. | the release of conduction electrons from parent atoms |
| C. | mutual collisions between metal atoms |
| D. | mutual collisions between conducting electrons |
| Answer» B. the release of conduction electrons from parent atoms | |
| 64. |
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 |
| Answer» C. True component of power | |
| 65. |
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 | |
| 66. |
Electric current passing through the circuit produces |
| A. | magnetic effect |
| B. | luminous effect |
| C. | thermal effect |
| D. | chemical effect |
| Answer» D. chemical effect | |
| 67. |
Resistance of a tungsten as applied voltage increases |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | none of the above |
| Answer» C. remains same | |
| 68. |
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. | |
| 69. |
In an electric kettle water boils in 10 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 | |
| 70. |
A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will |
| A. | decrease |
| B. | increase |
| C. | remain same |
| D. | heater will burn out |
| Answer» C. remain same | |
| 71. |
Which of the following quantities remain the same in all parts of a series circuit ? |
| A. | Voltage |
| B. | Current |
| C. | Power |
| D. | Resistance |
| Answer» C. Power | |
| 72. |
The thickness of insulation provided on the conductor depends on |
| A. | the magnitude of voltage on the conductor |
| B. | the magnitude of current flowing through it |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» B. the magnitude of current flowing through it | |
| 73. |
Heat in a conductor is produced on the passage of electric current due to |
| A. | reactance |
| B. | capacitance |
| C. | impedance |
| D. | resistance |
| Answer» E. | |
| 74. |
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 | |
| 75. |
A closed switch has a resistance of |
| A. | zero |
| B. | about 50 ohms |
| C. | about 500 ohms |
| D. | infinity |
| Answer» B. about 50 ohms | |
| 76. |
What will be energy used by the battery if the battery has to drive 6.28 x 1018 electrons with potential difference of 20 V across the terminal ? |
| A. | 5 joules |
| B. | 10 joules |
| C. | 15 joules |
| D. | 20 joules |
| Answer» E. | |
| 77. |
Two resistances Rl and R2 are connected in series across the voltage source where R2>R1. The largest drop will be across |
| A. | R2 |
| B. | R1 |
| C. | either Rl or R2 |
| D. | none of them |
| Answer» B. R1 | |
| 78. |
The four bulbs of 40 W each are connected in series with 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 | |
| 79. |
Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open |
| A. | there will be heavy current in the main line |
| B. | rest of the two bulbs will not light |
| C. | all three bulbs will light |
| D. | the other two bulbs will light |
| Answer» C. all three bulbs will light | |
| 80. |
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 | |
| 81. |
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 | |
| 82. |
The resistance of a few metres of wire conductor in closed electrical circuit is |
| A. | practically zero |
| B. | low |
| C. | high |
| D. | very high |
| Answer» B. low | |
| 83. |
A 3 ohm resistor having 2 A current will dissipate the power of |
| A. | 2 watts |
| B. | 4 watts |
| C. | 6 watts |
| D. | 12 watts |
| Answer» E. | |
| 84. |
The filament of an electric bulb is made of |
| A. | carbon |
| B. | aluminium |
| C. | tungsten |
| D. | nickel |
| Answer» D. nickel | |
| 85. |
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» D. the highest resistance has the highest voltage drop | |
| 86. |
The rating of a fuse wire is always expressed in |
| A. | ampere-hours |
| B. | ampere-volts |
| C. | kWh |
| D. | amperes |
| Answer» E. | |
| 87. |
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 | |
| 88. |
Varistors are |
| A. | insulators |
| B. | non-linear resistors |
| C. | carbon resistors |
| D. | resistors with zero temperature coefficient |
| Answer» C. carbon resistors | |
| 89. |
Which one of the following does not have negative temperature co-efficient ? |
| A. | Aluminium |
| B. | Paper |
| C. | Rubber |
| D. | Mica |
| Answer» B. Paper | |
| 90. |
A resistance having rating 10 ohms, 10W is likely to be a |
| A. | metallic resistor |
| B. | carbon resistor |
| C. | wire wound resistor |
| D. | variable resistor |
| Answer» D. variable resistor | |
| 91. |
All of the following are equivalent to watt except |
| A. | amperes square ohm |
| B. | joules/sec. |
| C. | amperes x volts |
| D. | amperes/volt |
| Answer» E. | |
| 92. |
For which of the following 'ampere second' could be the unit ? |
| A. | Reluctance |
| B. | Charge |
| C. | Power |
| D. | Energy |
| Answer» C. Power | |
| 93. |
Which is the best conductor of electricity ? |
| A. | Iron |
| B. | Silver |
| C. | Copper |
| D. | Carbon |
| Answer» C. Copper | |
| 94. |
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 | |
| 95. |
Which of the following materials has a negative temperature co-efficient of resistance? |
| A. | Copper |
| B. | Aluminum |
| C. | Carbon |
| D. | Brass |
| Answer» D. Brass | |
| 96. |
Which of the following statement is true both for a series and a parallel D.C. circuit? |
| A. | Elements have individual currents |
| B. | Currents are additive |
| C. | Voltages are additive |
| D. | Power are additive |
| Answer» E. | |
| 97. |
Two resistors are said to be connected in series when |
| A. | same current passes in turn through both |
| B. | both carry the same value of current |
| C. | total current equals the sum of branch currents |
| D. | sum of IR drops equals the applied e.m.f. |
| Answer» B. both carry the same value of current | |
| 98. |
You have to replace 1500 ohm resistor in radio. You have no 1500 ohm resistor but have several 1000 ohm ones which you would connect |
| A. | two in parallel |
| B. | two in parallel and one in series |
| C. | three in parallel |
| D. | three in series |
| Answer» C. three in parallel | |
| 99. |
Which of the following material has nearly zero temperature co-efficient of resistance? |
| A. | Manganin |
| B. | Porcelain |
| C. | Carbon |
| D. | Copper |
| Answer» B. Porcelain | |
| 100. |
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 micro second |
| D. | nearly 3 x 108 m/s |
| Answer» D. nearly 3 x 108 m/s | |