electrical engineering MCQs – Page 226

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

electrical engineering Mcqs

1. economics of power generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

4501. In a pure resistive circuit__________?
0

A. current is in phase with the voltage

B. current leads the voltage by 90

C. current can lead or lag the voltage by 90

D. current lags behind the voltage by 90

4502. Power factor of the following circuit will be unity
0

A. inductance

B. capacitance

C. resistance

D. both A. and B.

4503. Form Factor is the ratio of__________?
0

A. r.m.s. value/peak value

B. r.m.s. value/average value

C. average value/r.m.s. value

D. average value/peak value

4504. If two sine waves of the same frequency have a phase difference of JT radians, then_______?
0

A. both will reach their minimum values at the same instant

B. both will reach their maximum values at the same instant

C. when one wave reaches its maximum value, the other will reach its minimum value

D. none of the above

4505. Inductance affects the direct current flow__________?
0

A. at the time of turning on and off

B. only at the time of turning off

C. at all the time of operation

D. only at the time of turning on

4506. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is____________?
0

A. a sinusoid of the same frequency

B. not a sinusoid

C. a sinusoid of half the original frequency

D. a sinusoid of double the frequency

4507. A sine wave has a frequency of 50 Hz. Its angular frequency is ________ radian/second.
0

A. 5 n

B. 50 jt

C. 100 n

D. 25 JT

4508. The phase difference between voltage and current wave through a circuit element is given as 30. The essential condition is that
0

A. both waves must have same frequency

B. both waves must have identical peak values

C. both waves must have zero value at the same time

D. none of the above

4509. In a loss-free R-L-C circuit the transient current is__________?
0

A. non-oscillating

B. square wave

C. oscillating

D. sinusoidal

4510. Inductance of a coil Varies__________?
0

A. directly as the cross-sectional area of magnetic core

B. inversely as the length of the iron path

C. directly as square of number of turns

D. directly as the permeability of the core

E. as A. to (d)

4511. Capacitors for power factor correction are rated in_________?
0

A. kVAR

B. kV

C. kW

D. kVA

4512. An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?
0

A. the current through the resistance is more

B. the current through the resistance is less

C. both resistance and inductance carry equal currents

D. none of the above

4513. Time constant of an inductive circuit___________?
0

A. increases with decrease of inductance and increase of resistance

B. increases with decrease of inductance and decrease of resistance

C. increases with increase of inductance and decrease of resistance

D. increases with the increase of inductance and the increase of resistance

4514. A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to__________?
0

A. average voltage

B. peak voltage

C. none of the above

D. r.m.s. voltage

4515. Capacitive reactance is more when_______?
0

A. capacitance is less and frequency of supply is more

B. capacitance is more and frequency of supply is less

C. capacitance is more and frequency of supply is more

D. capacitance is less and frequency of supply is less

4516. Power factor of the system is kept high__________?
0

A. to reduce voltage regulation of the line

B. to maximise the utilization of the capacities of generators, lines and transformers

C. due to all above reasons

D. to reduce line losses

4517. The period of a sine wave is _____ seconds. Its frequency is
0

A. 20 Hz

B. 40 Hz

C. 50 Hz

D. 30 Hz

4518. In the case of an unsymmetrical alternating current the average value must always be taken over__________?
0

A. the whole cycle

B. unsymmetrical part of the wave form

C. the quarter cycle

D. the half cycle

4519. Pure inductive circuit takes power from the A.C. line when_________?
0

A. applied voltage decreases but current increases

B. applied voltage increases but current decreases

C. both applied voltage and current increase

D. both applied voltage and current decrease

4520. In an A.C. circuit power is dissipated in____________?
0

A. inductance only

B. none of the above

C. capacitance only

D. resistance only

Previous Next

Showing 4501 to 4520 of 7381 mcqs