MCQOPTIONS
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MCQOPTIONS
This section includes 49 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The energy required to charge a 10 uF capacitor to 100V is |
| A. | 0.10 J |
| B. | 0.05 J |
| C. | 5 X 10-9 J |
| D. | 10 X 10-9 J |
| Answer» C. 5 X 10-9 J | |
| 2. |
Which of the following are active components |
| A. | resistor and inductor |
| B. | Diode, BJT, FET |
| C. | Opamp, BJT, thermionic triode |
| D. | Capacitor, Inductor |
| Answer» C. Opamp, BJT, thermionic triode | |
| 3. |
Which one of the following does not affect the power output available from a particular ac generator? |
| A. | The strength of the magnet |
| B. | The number of turns in the coil |
| C. | The type of natural energy source used |
| D. | The speed of rotation of the coil or magnet |
| Answer» D. The speed of rotation of the coil or magnet | |
| 4. |
Three capacitors are connected in series having capacitance of 8uF, 32uF, 16uF, the total capacitance is |
| A. | 32/7 uF |
| B. | 7.32 uF |
| C. | 56 uF |
| D. | 32 uF |
| Answer» B. 7.32 uF | |
| 5. |
If two perfect sine waves have the same frequency and the same amplitude, but are in opposite phase, the composite wave |
| A. | Has twice the amplitude of either input wave alone |
| B. | Has half the amplitude of either input wave alone |
| C. | Is complex, but has the same frequency as the originals. |
| D. | Has zero amplitude ( that is, it does not exist) because the two input waves cancel each other out. |
| Answer» E. | |
| 6. |
The current gain of a bipolar transistor drops at high frequencies because of |
| A. | Transistor capacitance |
| B. | High current effects in the base |
| C. | Parasitic inductive elements |
| D. | the early effect |
| Answer» B. High current effects in the base | |
| 7. |
The five 0.050uF capacitors are connected in parallel. The equivalent capacitance is |
| A. | 0.010 uf |
| B. | 0.25 uf |
| C. | 0.50uf |
| D. | 0.025uf |
| Answer» C. 0.50uf | |
| 8. |
The relationship between frequency and time period of ac waveform is |
| A. | f = T |
| B. | f = 1/ T2 |
| C. | f = 1/T |
| D. | f = T2 |
| Answer» D. f = T2 | |
| 9. |
As the spacing between plates in a capacitor is made smaller |
| A. | The capacitance increases |
| B. | The capacitance decreases |
| C. | The capacitance does not change |
| D. | The resistance increases |
| Answer» B. The capacitance decreases | |
| 10. |
The power plant having highest efficiency is |
| A. | Hydro |
| B. | Thermal |
| C. | Nuclear |
| D. | Diesel |
| Answer» D. Diesel | |
| 11. |
A battery is source of |
| A. | DC voltage |
| B. | 1 phase AC voltage |
| C. | 3 phase ac voltage |
| D. | ac or dc voltage |
| Answer» B. 1 phase AC voltage | |
| 12. |
A degree of phase represents |
| A. | 6.28 cycles |
| B. | 57.3 cycles |
| C. | 1/60 of a cycle |
| D. | 1/360 of a cycle |
| Answer» E. | |
| 13. |
The sixth harmonic of a ac wave whose period is 1 Milli second has a frequency of |
| A. | 0.006Hz |
| B. | 167.0 Hz |
| C. | 7.0 kHz |
| D. | 6 kHz |
| Answer» E. | |
| 14. |
A network that does not have either voltage or current source is called ......network |
| A. | Active |
| B. | Passive |
| C. | Resistive |
| D. | Dummy |
| Answer» C. Resistive | |
| 15. |
The advantage of AC over DC in utility applications is |
| A. | AC is easier to transform from one voltage to another |
| B. | AC is transmitted with lower loss in wires |
| C. | AC can be easily obtained from dc generators |
| D. | AC can be generated with less dangerous by products |
| Answer» B. AC is transmitted with lower loss in wires | |
| 16. |
If two perfect sine waves have the same frequency and the same phase, the composite wave |
| A. | Is a sine wave with an amplitude equal to the difference between the amplitude of the waves |
| B. | Is a sine wave with an amplitude equal to the sum of the amplitudes of the two original waves |
| C. | Is not a sine wave, but has the same frequency as the two input waves |
| D. | Has zero amplitude (ie, it does not exist) because the two input waves cancel each other out. |
| Answer» C. Is not a sine wave, but has the same frequency as the two input waves | |
| 17. |
In India,electrical power is transmitted by |
| A. | 1-phase ac system |
| B. | 3-wire dc system |
| C. | 3-phase 3-wire ac system |
| D. | 2 wire dc system |
| Answer» D. 2 wire dc system | |
| 18. |
Watt hour is the unit of |
| A. | Electric power |
| B. | Electric capacity |
| C. | Electric energy |
| D. | Electric charge |
| Answer» D. Electric charge | |
| 19. |
In a 117Vrms utility circuit, the peak-to-peak voltage is approximately |
| A. | 82.7 V |
| B. | 165 V |
| C. | 234 V |
| D. | 331 V |
| Answer» E. | |
| 20. |
The color code of a resistor 2.7Kohm with the tolerance of 10% is |
| A. | red, violet, red and silver |
| B. | red, violet, yellow and gold |
| C. | red, violet, orange, silver |
| D. | red, violet, red,gold |
| Answer» B. red, violet, yellow and gold | |
| 21. |
Which of the following has minimum running cost? |
| A. | Hydro electric station |
| B. | nuclear power station |
| C. | thermal power station |
| D. | diesel power station |
| Answer» B. nuclear power station | |
| 22. |
the power factor of a purely resistive circuit is |
| A. | zero |
| B. | unity |
| C. | lagging |
| D. | leading |
| Answer» C. lagging | |
| 23. |
Cells are connected in parallel to |
| A. | Increase the available voltage |
| B. | Reduce the cost of wiring |
| C. | Increase the available current |
| D. | Reduce the time required to fully charge them after use |
| Answer» D. Reduce the time required to fully charge them after use | |
| 24. |
The power factor at resonance in RLC circuit is |
| A. | zero |
| B. | unity |
| C. | 0.5 lagging |
| D. | 0.5 leading |
| Answer» C. 0.5 lagging | |
| 25. |
The Q-factor of a coil is given by |
| A. | its power factor |
| B. | Ratio of max. energy stored & energy dissipated per cycle. |
| C. | reciprocal of its power factor |
| D. | ratio R/Z |
| Answer» D. ratio R/Z | |
| 26. |
The superposition theorem is applicable to circuits only having ............ elements |
| A. | non-linear |
| B. | passive |
| C. | resistive |
| D. | linear bilateral |
| Answer» E. | |
| 27. |
The combined resistance of two equal resistors connected in parallel is equal to |
| A. | One half the resistance of one resistor |
| B. | twice the resistance of one resistor |
| C. | four times the resistance of one resistor |
| D. | one fourth the resistance of one resistor |
| Answer» B. twice the resistance of one resistor | |
| 28. |
The power drawn by the circuit whose input is 20KVA and p.f is 0.8 lagging |
| A. | 12 |
| B. | 20 |
| C. | 16 |
| D. | 8 |
| Answer» D. 8 | |
| 29. |
The wire is stretched to double its length, then its resistance R will become |
| A. | r/2 |
| B. | 4r |
| C. | 2r |
| D. | r/4 |
| Answer» C. 2r | |
| 30. |
Which of the following bulbs will have the least resistance? |
| A. | 220V, 60W |
| B. | 220V, 100W |
| C. | 115V, 60W |
| D. | 115V, 100W |
| Answer» E. | |
| 31. |
The rms value of sinusoidal 100V peak to peak is |
| A. | 100 V |
| B. | 50/√2 V |
| C. | 50 V |
| D. | 100/√2 V |
| Answer» C. 50 V | |
| 32. |
Q factor of an inductive coil is given by |
| A. | 2π fL/R |
| B. | 2π fr/R |
| C. | R/Z |
| D. | lr/l |
| Answer» C. R/Z | |
| 33. |
Load factor is defined as the ratio of |
| A. | max demand/ average demand |
| B. | average demand/ connected load |
| C. | average demand/ max. demand |
| D. | connected load/ max demand |
| Answer» E. | |
| 34. |
The frequency of DC supply is |
| A. | 16 2/3 Hz |
| B. | 60 Hz |
| C. | 50 Hz |
| D. | 0 Hz |
| Answer» E. | |
| 35. |
Thevenin's equivalent circuit consists of |
| A. | A. series combination of Rth, Eth, Rl |
| B. | series combination of Rth, Eth |
| C. | parallel combination of Rth, Eth, R |
| D. | parallel combination of Rth, Eth |
| Answer» C. parallel combination of Rth, Eth, R | |
| 36. |
What is the angular frequency of the ac signal having a frequency of 1770Hz |
| A. | 1770 rad/s |
| B. | 11,120 rad/s |
| C. | 282 rad/s |
| D. | Data insufficient |
| Answer» C. 282 rad/s | |
| 37. |
The unit of inductance is |
| A. | Mho |
| B. | hendry |
| C. | ohm |
| D. | farad |
| Answer» C. ohm | |
| 38. |
Suppose that two ac waves have the same frequency but differ in phase by exactly 1/20 of a cycle. What is the phase difference between these two waves? |
| A. | 18 deg |
| B. | 20 deg |
| C. | 36 deg |
| D. | 5.73 deg |
| Answer» B. 20 deg | |
| 39. |
In ac circuit, the ratio of kW/kVA is |
| A. | power factor |
| B. | form factor |
| C. | load factor |
| D. | diversity factor |
| Answer» B. form factor | |
| 40. |
In a small inductance |
| A. | Energy is stored and released slowly |
| B. | The current flow is always large |
| C. | The current flow is always slow |
| D. | Energy is stored and released quickly |
| Answer» E. | |
| 41. |
As capacitor plate area increases |
| A. | The capacitance increases |
| B. | The capacitance decreases |
| C. | The capacitance does not change |
| D. | The current handling ability decreases |
| Answer» B. The capacitance decreases | |
| 42. |
An inductor works by |
| A. | Charging a piece of wire |
| B. | Storing energy as a magnetic field |
| C. | Choking off dc |
| D. | Introducing resistance into a field |
| Answer» C. Choking off dc | |
| 43. |
The period of a ac wave, in seconds is |
| A. | The same as the frequency in hertz |
| B. | Not related to the frequency in any way |
| C. | Equal to 1 divided by the frequency in hertz |
| D. | Equal to the peak amplitude in volts divided by the frequency in hertz |
| Answer» D. Equal to the peak amplitude in volts divided by the frequency in hertz | |
| 44. |
A ferromagnetic core is place in the inductor to |
| A. | Increase the current carrying capacity |
| B. | Increase the inductance |
| C. | Limit the current |
| D. | Reduce the inductance |
| Answer» C. Limit the current | |
| 45. |
On a spectrum analyzer, a ac signal having only one frequency component looks like |
| A. | A single pip |
| B. | A sine wave |
| C. | A square wave |
| D. | A sawtooth wave |
| Answer» B. A sine wave | |
| 46. |
Capacitance acts to store electrical energy as |
| A. | Current |
| B. | Voltage |
| C. | A magnetic field |
| D. | An electric field |
| Answer» E. | |
| 47. |
The length of time between a point in one cycle and the same point in the next cycle of an ac wave is the |
| A. | Frequency |
| B. | Magnitude |
| C. | Period |
| D. | Polarity |
| Answer» D. Polarity | |
| 48. |
If all other factors are kept constant, the inductance of the air-core coil is not affected by |
| A. | The frequency |
| B. | The number of turns |
| C. | The diameter of the coil |
| D. | The length of the coil |
| Answer» B. The number of turns | |
| 49. |
Which of the following can vary with ac, but never with dc? |
| A. | Power |
| B. | Voltage |
| C. | Frequency |
| D. | Amplitude |
| Answer» D. Amplitude | |