electrical engineering MCQs – Page 303

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 Review each marked answer and report any item that may be outdated or unclear.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

6041. Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor ?
0

A. All of the above

B. Stator winding to earthed frame

C. Rotor winding to earthed shaft

D. Phase to phase winding resistance

6042. The induced e.m.f. in a synchronous motor working on leading power factor will be_____________?
0

A. equal to the supply voltage

B. None of these

C. less than the supply voltage

D. more than the supply voltage

6043. In which of the following motors the stator and rotor fields rotate simultaneously?
0

A. D.C. motor

B. Induction motor

C. Universal motor

D. Reluctance motor

E. Synchronous motor

6044. The synchronous motor is not inherently self-starting because_______________?
0

A. the rotating magnetic field is produced by only 50 Hz frequency currents

B. the force required to accelerate the rotor to the synchronous speed in an instant is absent

C. the starting device to accelerate the rotor to near synchronous speed is absent

D. a rotating magnetic field does not have enough poles

6045. As the load is applied to a synchronous motor, the motor takes more armature current because
0

A. the rotor strengthens the rotating field casuing more motor current

B. the rotor by shifting its phase backward causes motor to take more current

C. the increased load has to take more current

D. the back e.m.f. decreases causing an increase in motor current

6046. In a JFET, IDSS is known as ________________?
0

A. none of the above

B. drain to source current

C. drain to source current with gate shorted

D. drain to source current with gate open

6047. A JFET has high input impedance because _________________?
0

A. of impurity atoms

B. none of the above

C. it is made of semiconductor material

D. input is reverse biased

6048. The constant-current region of a JFET lies between______________?
0

A. pinch-off and breakdown

B. cut off and saturation

C. cut off and pinch-off

D. and IDSS

6049. A JFET is similar in operation to ___________ valve?
0

A. triode

B. tetrode

C. pentode

D. diode

6050. The gate of a JFET is ___________ biased?
0

A. forward

B. reverse

C. none of the above

D. reverse as well as forward

6051. A certain D-MOSFET is biased at VGS = 0 V. Its data sheet specifies IDSS = 20mA and VGS(off) = -5 V. The value of the drain current is _____________?
0

A. 20 mA

B. 0 mA

C. 40 mA

D. 10 mA

6052. In a certain CS JFET amplifier, RD= 1kO , RS= 560 O , VDD=10V and gm= 4500 S. If the source resistor is completely bypassed, the voltage gain is ________________?
0

A. 2.52

B. 45

C. 450

D. 4.5

6053. A certain JFET data sheet gives VGS(off) = -4 V. The pinch-off voltage Vp is _____________?
0

A. -4 V

B. data insufficient

C. +4 V

D. dependent on VGS

6054. When drain voltage equals the pinch-off-voltage, then drain current ___________ with the increase in drain voltage?
0

A. decreases

B. increases

C. none of the above

D. remains constant

6055. The two important advantages of a JFET are _________________?
0

A. inexpensive and high output impedance

B. none of the above

C. low input impedance and high output impedance

D. high input impedance and square-law property

6056. In a p-channel JFET, the charge carriers are _____________?
0

A. electrons

B. holes

C. both electrons and holes

D. none of the above

6057. _____________ has the lowest noise-level?
0

A. triode

B. tetrode

C. JFET

D. ordinary trnsistor

6058. A MOSFET is sometimes called______________ JFET?
0

A. open gate

B. many gate

C. insulated gate

D. shorted gate

6059. The pinch-off voltage of a JFET is about _______________?
0

A. 25 V

B. 0.6 V

C. 5 V

D. 15 V

6060. A JFET is a__________ driven device?
0

A. current

B. voltage

C. both current and voltage

D. none of the above

Previous Next

Showing 6041 to 6060 of 7381 mcqs