MCQOPTIONS
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MCQOPTIONS
This section includes 122 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
A field of force can exist only between |
| A. | Two molecules |
| B. | Two ions |
| C. | Two atoms |
| D. | Two metal particles |
| Answer» C. Two atoms | |
| 102. |
The rating of a fuse wire is always expressed in |
| A. | Ampere-hours |
| B. | Ampere-volts |
| C. | kWh |
| D. | Amperes |
| Answer» E. | |
| 103. |
An open resistor, when checked with an ohmmeter reads |
| A. | Zero |
| B. | Infinite |
| C. | High but within tolerance |
| D. | Low but not zero |
| Answer» C. High but within tolerance | |
| 104. |
With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals |
| A. | 10 W |
| B. | 20 W |
| C. | 40 W |
| D. | 60 W |
| Answer» E. | |
| 105. |
Voltage dependent resistors are usually made from |
| A. | Charcoal |
| B. | Silicon carbide |
| C. | Nichrome |
| D. | Graphite |
| Answer» D. Graphite | |
| 106. |
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 | |
| 107. |
The hot resistance of the bulb's filament is higher than its cold resistance because the temperature coefficient of the filament is |
| A. | Zero |
| B. | Negative |
| C. | Positive |
| D. | About 2 ohms per degree |
| Answer» D. About 2 ohms per degree | |
| 108. |
Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be |
| A. | 9 times |
| B. | 1/9 times |
| C. | 1/3 times |
| D. | 3 times |
| Answer» C. 1/3 times | |
| 109. |
Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25 Q. If the same four wires are connected is series the effective resistance will be |
| A. | 1 Q |
| B. | 2 Q |
| C. | 3 Q |
| D. | 4 Q |
| Answer» E. | |
| 110. |
You have to replace 1500 Q resistor in radio. You have no 1500 Q resistor but have several 1000 Q 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 | |
| 111. |
All good conductors have high |
| A. | Conductance |
| B. | Resistance |
| C. | Reluctance |
| D. | Thermal conductivity |
| Answer» B. Resistance | |
| 112. |
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 | |
| 113. |
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 | |
| 114. |
Which of the following materials has the least resistivity ? |
| A. | Zinc |
| B. | Lead |
| C. | Mercury |
| D. | Copper |
| Answer» E. | |
| 115. |
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. | Semiconductors |
| D. | Variable resistors |
| Answer» D. Variable resistors | |
| 116. |
An instrument which detects electric current is known as |
| A. | Voltmeter |
| B. | Rheostat |
| C. | Watt-meter |
| D. | Galvanometer |
| Answer» E. | |
| 117. |
A substance whose molecules consist of dissimilar atoms is called |
| A. | Semiconductor |
| B. | Super-conductor |
| C. | Compound |
| D. | Insulator |
| Answer» D. Insulator | |
| 118. |
The property of a conductor due to which it passes current is called |
| A. | Resistance |
| B. | Reluctance |
| C. | Conductance |
| D. | Inductance |
| Answer» D. Inductance | |
| 119. |
Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be |
| A. | 160 ohms |
| B. | 80 ohms |
| C. | 20 ohms |
| D. | 10 ohms |
| Answer» E. | |
| 120. |
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 | |
| 121. |
Which method can be used for absolute measurement of resistances? |
| A. | Lorentz method |
| B. | Raleigh method |
| C. | Ohm's law method |
| D. | Wheatstone bridge method |
| Answer» E. | |
| 122. |
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 becomes more |
| D. | None of the above is correct |
| Answer» D. None of the above is correct | |