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.
| 1. |
Which one of the following does not have negative temperature co-efficient ____________? |
| A. | Aluminium |
| B. | Paper |
| C. | Rubber |
| D. | Mica |
| Answer» B. Paper | |
| 2. |
Which quantity consists of a unit 1KWh ? |
| A. | Energy |
| B. | Time |
| C. | Power |
| D. | Charge |
| Answer» B. Time | |
| 3. |
Which quantity should be measured by the voltmeter ? |
| A. | Current |
| B. | Voltage |
| C. | Power |
| D. | Speed |
| Answer» C. Power | |
| 4. |
With rise in temperature the resistance of pure metals______________? |
| A. | increases |
| B. | decreases |
| C. | first increases and then decreases |
| D. | remains constant |
| Answer» B. decreases | |
| 5. |
With rise in temperature the resistance of semi-conductors_________________? |
| A. | decreases |
| B. | increases |
| C. | first increases and then decreases |
| D. | remains constant |
| Answer» B. increases | |
| 6. |
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. | |
| 7. |
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 | |
| 8. |
Which of the following statement is true________________? |
| A. | A galvanometer with low resistance in parallel is a voltmeter |
| B. | A galvanometer with high resistance in parallel is a voltmeter |
| C. | A galvanometer with low resistance in series is an ammeter |
| D. | A galvanometer with high resistance in series is an ammeter |
| Answer» D. A galvanometer with high resistance in series is an ammeter | |
| 9. |
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. | |
| 10. |
Which of the following statement is correct_______________? |
| A. | A semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator |
| B. | A semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator |
| C. | A semi-conductor is one which con¬ducts only half of the applied voltage |
| D. | A semi-conductor is a material made of alternate layers of conducting material and insulator |
| Answer» B. A semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator | |
| 11. |
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 | |
| 12. |
Which of the following quantities consists of SI unit as WATT ? |
| A. | Force |
| B. | Charge |
| C. | Current |
| D. | Power |
| Answer» E. | |
| 13. |
Which of the following materials has a negative temperature co-efficient of resistance? |
| A. | Copper |
| B. | Aluminum |
| C. | Carbon |
| D. | Brass |
| Answer» D. Brass | |
| 14. |
Which of the following material has nearly zero temperature co-efficient of resistance_________? |
| A. | Manganin |
| B. | Porcelain |
| C. | Carbon |
| D. | Copper |
| Answer» B. Porcelain | |
| 15. |
Which of the following can have negative temperature coefficient _____________? |
| A. | Compounds of silver |
| B. | Liquid metals |
| C. | Metallic alloys |
| D. | Electrolytes |
| Answer» E. | |
| 16. |
Which method can be used for absolute measurement of resistances _______________? |
| A. | Lorentz method |
| B. | Releigh method |
| C. | Ohm’s law method |
| D. | Wheatstone bridge method |
| Answer» B. Releigh method | |
| 17. |
Which is the best conductor of electricity _______________? |
| A. | Iron |
| B. | Silver |
| C. | Copper |
| D. | Carbon |
| Answer» C. Copper | |
| 18. |
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. | |
| 19. |
When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will___________? |
| A. | decrease |
| B. | increase |
| C. | remain constant |
| D. | none of the above |
| Answer» C. remain constant | |
| 20. |
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 | |
| 21. |
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 | |
| 22. |
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 | |
| 23. |
When current flows through heater coil it glows but supply wiring does not glow because______________? |
| A. | current through supply line flows at slower speed |
| B. | supply wiring is covered with insulation layer |
| C. | resistance of heater coil is more than the supply wires |
| D. | supply wires are made of superior material |
| Answer» D. supply wires are made of superior material | |
| 24. |
When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is___________? |
| A. | 1 n-mho |
| B. | 106 mho |
| C. | 1 milli-mho |
| D. | none of the above |
| Answer» B. 106 mho | |
| 25. |
Voltage dependent resistors are used_____________? |
| A. | for inductive circuits |
| B. | to supress surges |
| C. | as heating elements |
| D. | as current stabilizers |
| Answer» C. as heating elements | |
| 26. |
Voltage dependent resistors are usually made from________________? |
| A. | Charcoal |
| B. | Silicon Carbide |
| C. | Nichrome |
| D. | Graphite |
| Answer» C. Nichrome | |
| 27. |
Varistors are______________? |
| A. | insulators |
| B. | non-linear resistors |
| C. | carbon resistors |
| D. | resistors with zero temperature coefficient |
| Answer» C. carbon resistors | |
| 28. |
Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across______________? |
| A. | Rl |
| B. | Ri |
| C. | either Rl or Ri |
| D. | none of them |
| Answer» B. Ri | |
| 29. |
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 | |
| 30. |
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 glow 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 | |
| 31. |
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. | |
| 32. |
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 | |
| 33. |
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 | |
| 34. |
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» E. | |
| 35. |
Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners ___________? |
| A. | 3/2 Q |
| B. | 6 Q |
| C. | 4 Q |
| D. | 8/3 Q |
| Answer» D. 8/3 Q | |
| 36. |
The voltage induced in an inductor is represented as, |
| A. | product of its inductance and current through it. |
| B. | ratio of its inductance to the current through it. |
| C. | ratio of the current through it to its inductance. |
| D. | product of its inductance and rate of change of current through it. |
| Answer» E. | |
| 37. |
The unit of resistivity is |
| A. | Ω |
| B. | Ω – metre. |
| C. | Ω / metre. |
| D. | Ω / m². |
| Answer» C. Ω / metre. | |
| 38. |
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 | |
| 39. |
The substances which have a large number of free electrons and offer a low resistance are called____? |
| A. | insulators |
| B. | inductors |
| C. | semi-conductors |
| D. | conductors |
| Answer» E. | |
| 40. |
The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other ? |
| A. | 18 Q |
| B. | 36 Q |
| C. | 48 Q |
| D. | 64 Q |
| Answer» C. 48 Q | |
| 41. |
The resistance of a few meters of wire conductor in closed electrical circuit is____________? |
| A. | practically zero |
| B. | low |
| C. | high |
| D. | very high |
| Answer» B. low | |
| 42. |
The resistance of a copper wire 200 m long is 21 Q. If its thickness (diameter) is 0.44 mm, its specific resistance is around_______________? |
| A. | 1.2 x 10~8 Q-m |
| B. | 1.4 x 10~8 Q-m |
| C. | 1.6 x 10″”8 Q-m |
| D. | 1.8 x 10″8 Q-m |
| Answer» D. 1.8 x 10″8 Q-m | |
| 43. |
The resistance of a conductor varies inversely as___________? |
| A. | length |
| B. | area of cross-section |
| C. | temperature |
| D. | resistivity |
| Answer» C. temperature | |
| 44. |
The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be |
| A. | R Ω |
| B. | 2R Ω |
| C. | 4R Ω |
| D. | 8R Ω |
| Answer» E. | |
| 45. |
The ratio of mass of proton to that of electron is nearly_____________? |
| A. | 1840 |
| B. | 1840 |
| C. | 30 |
| D. | 4 |
| Answer» B. 1840 | |
| 46. |
The rating of a fuse wire is always expressed in________________? |
| A. | ampere-hours |
| B. | ampere-volts |
| C. | kWh |
| D. | amperes |
| Answer» E. | |
| 47. |
The property of a conductor due to which it passes current is called___________? |
| A. | resistance |
| B. | reluctance |
| C. | conductance |
| D. | inductance |
| Answer» D. inductance | |
| 48. |
The number of electrons in the outer most orbit of carbon atom is___________? |
| A. | 3 |
| B. | 4 |
| C. | 6 |
| D. | 7 |
| Answer» C. 6 | |
| 49. |
The minimum charge on an ion is______________? |
| A. | equal to the atomic number of the atom |
| B. | equal to the charge of an electron |
| C. | equal to the charge of the number of electrons in an atom (#) zero |
| Answer» C. equal to the charge of the number of electrons in an atom (#) zero | |
| 50. |
The insulation on a current carrying conductor is provided__________? |
| A. | to prevent leakage of current |
| B. | to prevent shock |
| C. | both of above factors |
| D. | none of above factors |
| Answer» D. none of above factors | |