InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Forced commutated CSI require _________(a) Diode(b) Resistor(c) Inductor(d) CapacitorI had been asked this question in an interview.Origin of the question is Solid-State Switching Circuits in division Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» Correct option is (d) Capacitor |
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| 2. |
1600 V rated 8 SCRs are connected in series. The operation voltage of the string is 4400. Calculate the string efficiency.(a) 34.37 %(b) 30.15 %(c) 38.48 %(d) 35.84 %I have been asked this question in an interview.I'd like to ask this question from Solid-State Switching Circuits in portion Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» The correct CHOICE is (a) 34.37 % |
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| 3. |
Calculate the average value of thyristor current in 3-Φ Full wave converter for the load current=729 A and α=3°.(a) 254 A(b) 285 A(c) 247 A(d) 243 AThis question was posed to me in unit test.Origin of the question is Solid-State Switching Circuits in chapter Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» The correct OPTION is (d) 243 A |
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| 4. |
Full form of FET is ___________(a) Field effect transistor(b) Field engage transistor(c) Field effect terminal(d) Fire engage transistorThe question was asked by my school principal while I was bunking the class.Enquiry is from Solid-State Switching Circuits topic in portion Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» Right OPTION is (a) Field EFFECT TRANSISTOR |
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| 5. |
TRIAC is a unipolar switch.(a) True(b) FalseI have been asked this question at a job interview.My doubt stems from Solid-State Switching Circuits topic in chapter Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» Correct option is (b) False |
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| 6. |
Full form of SCR is ____________(a) Silicon controlled rectifier(b) State-controlled rectifier(c) State cover rectifier(d) State-controlled resetThis question was addressed to me in an international level competition.Question is taken from Solid-State Switching Circuits topic in division Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» Correct option is (a) SILICON controlled RECTIFIER |
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| 7. |
Calculate the form factor if V(r.m.s)=45 V, V(avg)=15 V.(a) 2(b) 5(c) 3(d) 8The question was asked during an online interview.This intriguing question originated from Solid-State Switching Circuits in division Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» CORRECT CHOICE is (C) 3 Best explanation: The form factor is defined as the ratio of the Vr.m.s÷Vavg=45÷15=3. The r.m.s value is three TIMES of average value Vavg. |
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| 8. |
Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 13° and supply frequency is 49.5 Hz.(a) 730.2 msec(b) 740.8 msec(c) 754.5 msec(d) 755.1 msecThis question was addressed to me in my homework.I want to ask this question from Solid-State Switching Circuits in chapter Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» RIGHT OPTION is (a) 730.2 msec For explanation: The circuit turn-off time for 3-Φ FULLY CONTROLLED rectifier is (240°-α)÷ω. The value of circuit turn-off time for ∝ < 60° is (240°-13°)÷6.28×49.5=730.2 msec. |
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| 9. |
Calculate the value of the Input power factor for 3-Φ Fully controlled rectifier if the firing angle value is 16°.(a) .96(b) .91(c) .93(d) .94The question was posed to me by my college professor while I was bunking the class.This key question is from Solid-State Switching Circuits in section Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» CORRECT option is (b) .91 For explanation: The VALUE of the input power FACTOR for 3-Φ Fully controlled rectifier is .95cos(16°)=.91. The input power factor is a product of DISTORTION factor and displacement factor. |
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| 10. |
Calculate the value of the Input power factor for 1-Φ Full wave bridge rectifier if the firing angle value is 39°.(a) .69(b) .59(c) .78(d) .15This question was posed to me in quiz.The question is from Solid-State Switching Circuits in section Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» Correct answer is (a) .69 |
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| 11. |
Volt-sec balance method is based on the principle of the energy of conservation.(a) True(b) FalseThe question was posed to me during a job interview.My enquiry is from Solid-State Switching Circuits in chapter Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» The CORRECT ANSWER is (a) True |
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| 12. |
20 V rated 8 SCRs are connected in series. The operation voltage of the string is 50. Calculate the De-rating factor.(a) .67(b) .68(c) .69(d) .70The question was posed to me in an interview.My question is taken from Solid-State Switching Circuits in chapter Introduction to Solid-State Switching Circuits of Electric Drives |
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| 13. |
Calculate the string efficiency if the de-rating factor is .76.(a) 24 %(b) 25 %(c) 26 %(d) 27 %I have been asked this question in final exam.Question is taken from Solid-State Switching Circuits topic in section Introduction to Solid-State Switching Circuits of Electric Drives |
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| 14. |
Calculate the r.m.s value of the fundamental component of the output current having an amplitude of 3 A for CSI.(a) 2.80 A(b) 2.70 A(c) 2.54 A(d) 3.48 AThe question was posed to me during an interview.Question is from Solid-State Switching Circuits topic in portion Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» Correct ANSWER is (b) 2.70 A |
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| 15. |
Calculate the r.m.s value of the output current having an amplitude of 2 A for CSI.(a) 3 A(b) 4 A(c) 2 A(d) 1 AI got this question during an online interview.My question comes from Solid-State Switching Circuits topic in chapter Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» CORRECT answer is (b) 4 A Easiest EXPLANATION: The r.m.s VALUE of the output current having an amplitude of 2 A for CSI is 2A. The waveform for output current is a square wave. The r.m.s value of the square wave is its amplitude. |
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| 16. |
Number of switches turned on in CSI at a single time are __________(a) 2(b) 4(c) 5(d) 3The question was posed to me at a job interview.I need to ask this question from Solid-State Switching Circuits in division Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» The CORRECT choice is (a) 2 |
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| 17. |
T.H.D value for CSI is ________________(a) 48.43 %(b) 41.15 %(c) 39.15 %(d) 46.48 %The question was asked during an interview for a job.This interesting question is from Solid-State Switching Circuits in portion Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» CORRECT option is (a) 48.43 % The explanation: T.H.D VALUE for VSI is 48.43 %. Triplen harmonics are present in CSI DUE to which harmonic content increases. |
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| 18. |
What is the distortion factor value in CSI?(a) .85(b) .90(c) .95(d) .88I had been asked this question in final exam.I want to ask this question from Solid-State Switching Circuits topic in chapter Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» The CORRECT answer is (b) .90 |
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| 19. |
The output current waveform for R load in CSI is ___________(a) Square(b) Triangular(c) Constant(d) VerticalI have been asked this question by my school principal while I was bunking the class.My query is from Solid-State Switching Circuits in section Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» RIGHT OPTION is (a) SQUARE The explanation: The output CURRENT of CSI for R load is square in nature. The amplitude of the output current varies from I to -I. |
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| 20. |
Calculate the maximum frequency for ASCI using the data: R=15 kΩ, C=5 μF.(a) 3.51 Hz(b) 3.69 Hz(c) 3.33 Hz(d) 3.98 HzThis question was posed to me in a national level competition.This intriguing question originated from Solid-State Switching Circuits in portion Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» Correct OPTION is (c) 3.33 Hz |
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| 21. |
Calculate the minimum time period for ASCI using the data: R=12 kΩ, C=45 μF.(a) 2.58 sec(b) 2.16 sec(c) 2.23 sec(d) 2.48 secThis question was posed to me by my school teacher while I was bunking the class.I'm obligated to ask this question of Solid-State Switching Circuits in section Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» The correct OPTION is (B) 2.16 sec |
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| 22. |
Which one of the element is used to make R load commutating?(a) Inductor(b) Capacitor(c) Resistor(d) CoilI got this question in an international level competition.The origin of the question is Solid-State Switching Circuits in section Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» CORRECT option is (b) Capacitor Easiest explanation: Capacitor is USED to MAKE the R LOAD commutating. It is used in parallel with the RESISTIVE load. |
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| 23. |
The output voltage of CSI depends upon the load.(a) True(b) FalseThis question was addressed to me by my college director while I was bunking the class.Question is from Solid-State Switching Circuits in portion Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» Right CHOICE is (a) True |
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| 24. |
The use of inductor in CSI is to make source current constant.(a) True(b) FalseThis question was addressed to me at a job interview.This is a very interesting question from Solid-State Switching Circuits in chapter Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» CORRECT option is (a) True For EXPLANATION I WOULD say: The inductor in CSI is used to make the source current constant. The input current of CSI should be constant. |
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| 25. |
Calculate the r.m.s value of thyristor current in 3-Φ Full wave converter for the load current=2 A and α=59°.(a) 1.15 A(b) 2.55 A(c) 2.07 A(d) 2.89 AThe question was asked during an interview.This question is from Solid-State Switching Circuits in chapter Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» RIGHT choice is (a) 1.15 A The explanation is: The r.m.s value of THYRISTOR CURRENT in 3-Φ Full WAVE converter is Io√1÷3. It is the r.m.s value of the thyristor current. I(r.m.s) = Io√1÷3=1.15 A. |
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| 26. |
Calculate the phase voltage for 3-∅ 120° VSI if the value of DC supply is 78 V.(a) 30.45 V(b) 15.18 V(c) 31.84 V(d) 48.15 VThe question was asked in an international level competition.The origin of the question is Solid-State Switching Circuits in portion Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» Correct CHOICE is (c) 31.84 V |
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| 27. |
Calculate the line voltage for 3-∅ 120° VSI if the value of DC supply is 96 V.(a) 68.25 V(b) 67.87 V(c) 66.25 V(d) 62.14 VI got this question at a job interview.My enquiry is from Solid-State Switching Circuits in division Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» The correct CHOICE is (b) 67.87 V |
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| 28. |
Calculate the rotational kinetic energy of the object using the data: I=5 Kg-m^2, ω=25 rad/sec.(a) 1.46 KJ(b) 1.56 KJ(c) 2.58 KJ(d) 3.15 KJI have been asked this question during an interview.I want to ask this question from Solid-State Switching Circuits in division Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» RIGHT choice is (b) 1.56 KJ Explanation: The Kinetic ENERGY of the object having a MOMENT of inertia=5 kg-m^2 ROTATING with an angular velocity EQUALS to 25 rad/sec is .5×I×ω^2 = .5×5×25×25 = 1.56 KJ. |
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| 29. |
Calculate Kinetic energy of the object of mass = 7 Kg moving in a straight line with a velocity of 12 m/s.(a) 504 J(b) 502 J(c) 503 J(d) 509 JI had been asked this question in quiz.The query is from Solid-State Switching Circuits in chapter Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» Right choice is (a) 504 J |
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| 30. |
Calculate the maximum fluctuation of speed using the data: Vmax=23 m/sec, Vmin=13 m/sec.(a) 12(b) 10(c) 14(d) 15The question was asked in an interview for internship.This intriguing question comes from Solid-State Switching Circuits topic in division Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» The CORRECT option is (B) 10 |
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| 31. |
Calculate the coefficient of fluctuation of speed using the data: Vmax(Fluctuation)=25 m/sec, Vmean=12 m/sec.(a) 2.08(b) 2.16(c) 2.34(d) 2.74This question was posed to me in an interview.This interesting question is from Solid-State Switching Circuits in division Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» The correct CHOICE is (a) 2.08 |
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| 32. |
Energy is stored in Flywheel in the form of __________(a) Kinetic energy(b) Electrical energy(c) Solar energy(d) Wind energyThe question was asked during an interview.Question is taken from Solid-State Switching Circuits in chapter Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» RIGHT CHOICE is (a) Kinetic ENERGY For EXPLANATION I would say: Energy is stored in Flywheel in the form of kinetic energy. It stores the ROTATIONAL kinetic energy. |
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| 33. |
Flywheel is analogous to ___________(a) Chemical battery(b) Mechanical battery(c) Nuclear battery(d) Electrostatic batteryI got this question in an online interview.I'm obligated to ask this question of Solid-State Switching Circuits in division Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» Right option is (B) Mechanical battery |
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| 34. |
Full form of IGBT is ___________(a) Insulated gate bipolar transistor(b) Insulated gate bipolar transducer(c) Insulator gate bidirectional transducer(d) Insulated gate bidirectional transistorThis question was addressed to me in my homework.I'm obligated to ask this question of Solid-State Switching Circuits in portion Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» CORRECT option is (a) INSULATED gate bipolar transistor The explanation is: Full FORM of IGBT is Insulated gate bipolar transistor. It is a 3-terminal device, bipolar in nature. It can be used as a SWITCH. |
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| 35. |
Full form of KERS is___________(a) The kinetic energy recovery system(b) The kinetic ever recovery system(c) Kin ever recovery system(d) The kinetic energy recovery storeThe question was asked in quiz.This is a very interesting question from Solid-State Switching Circuits in section Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» The correct option is (a) The kinetic energy recovery system |
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| 36. |
Short circuit problem is severe in case of current source inverter.(a) True(b) FalseThe question was posed to me in my homework.I'm obligated to ask this question of Solid-State Switching Circuits topic in portion Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» Right answer is (b) False |
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| 37. |
Rectifiers are used to convert DC power into variable AC power.(a) True(b) FalseI had been asked this question in exam.This interesting question is from Solid-State Switching Circuits topic in section Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» The correct choice is (B) False |
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| 38. |
T.H.D value for 3-∅ 180° VSI is ________________(a) 36 %(b) 31 %(c) 39 %(d) 46 %This question was posed to me during an internship interview.I want to ask this question from Solid-State Switching Circuits topic in division Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» Correct choice is (B) 31 % |
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| 39. |
Calculate power absorbed by 10 Ω load in 3-∅ 180° VSI if the value of DC supply is 36 V.(a) 20.6 W(b) 24.5 W(c) 26.4 W(d) 28.8 WThis question was posed to me in an interview.The query is from Solid-State Switching Circuits in portion Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» Correct option is (d) 28.8 W |
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| 40. |
Calculate power absorbed by 5 Ω load in 3-∅ 120° VSI if the value of DC supply is 16 V.(a) 17.06 W(b) 15.15 W(c) 18.25 W(d) 19.26 WThe question was posed to me in class test.The origin of the question is Solid-State Switching Circuits in section Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» The CORRECT ANSWER is (a) 17.06 W |
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| 41. |
Calculate the phase voltage for 3-∅ 120° VSI if the value of DC supply is 26 V.(a) 10.52 V(b) 10.97 V(c) 10.96 V(d) 10.61 VThe question was asked during a job interview.This intriguing question originated from Solid-State Switching Circuits topic in chapter Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» The correct answer is (d) 10.61 V |
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| 42. |
Calculate the line voltage for 3-∅ 120° VSI if the value of DC supply is 24 V.(a) 16.52 V(b) 16.97 V(c) 12.96 V(d) 12.48 VI got this question in my homework.My doubt stems from Solid-State Switching Circuits topic in section Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» RIGHT OPTION is (B) 16.97 V To elaborate: The line voltage for 3-∅ 120° VSI is (VDC÷√2)=.707×24=16.97 V. In 3-phase 120° VSI each phase conducts for 120° and only three SWITCHES from DIFFERENT phases conduct at a single time. |
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| 43. |
Calculate the line voltage for 3-∅ 180° VSI if the value of DC supply is 22 V.(a) 18.52 V(b) 18.12 V(c) 17.96 V(d) 15.48 VThis question was posed to me during an online exam.My question comes from Solid-State Switching Circuits topic in chapter Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» The correct option is (c) 17.96 V |
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| 44. |
Calculate the phase voltage for 3-∅ 180° VSI if the value of DC supply is 20 V.(a) 9.40 V(b) 9.42 V(c) 9.18 V(d) 9.78 VI got this question in final exam.Question is from Solid-State Switching Circuits in chapter Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» The CORRECT CHOICE is (b) 9.42 V |
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| 45. |
Number of switches turned on in 3-phase 120° VSI at a single time are __________(a) 2(b) 4(c) 5(d) 3This question was addressed to me in a national level competition.This intriguing question comes from Solid-State Switching Circuits topic in portion Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» Correct CHOICE is (d) 3 |
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| 46. |
Number of switches turned on in 3-phase 180° VSI at a single time are __________(a) 3(b) 2(c) 1(d) 4I had been asked this question during an online exam.My question is based upon Solid-State Switching Circuits in portion Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» CORRECT CHOICE is (B) 2 Easy explanation: In 3-phase 180° VSI each phase CONDUCTS for 180° and only two switches from different PHASES conduct at a single time. |
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| 47. |
Full form of CSI is ___________(a) Counter source inverter(b) Counter severe inverter(c) Current source inverter(d) Current severe inverterThe question was asked during an internship interview.I'm obligated to ask this question of Solid-State Switching Circuits in chapter Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» CORRECT choice is (c) Current source INVERTER The EXPLANATION: CSI stands for Current source inverter. The output VOLTAGE of CSI is variable but the output current is fixed. |
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| 48. |
Switches used in CSI are ____________(a) Bipolar & Unidirectional(b) Bipolar & Bidirectional(c) Unipolar & Unidirectional(d) BidirectionalThe question was posed to me in my homework.The doubt is from Solid-State Switching Circuits topic in chapter Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» The CORRECT option is (a) Bipolar & Unidirectional |
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| 49. |
Full form of VSI is ___________(a) Voltage source inverter(b) Volume source inverter(c) Voltage severe inverter(d) Voltage source inserterI had been asked this question in an interview for internship.Question is taken from Solid-State Switching Circuits in section Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» The correct OPTION is (a) VOLTAGE source INVERTER |
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| 50. |
Switches used in VSI are ___________(a) Unipolar & Unidirectional(b) Bipolar & Bidirectional(c) Unipolar & Bidirectional(d) UnidirectionalThis question was posed to me in an internship interview.This interesting question is from Solid-State Switching Circuits in chapter Introduction to Solid-State Switching Circuits of Electric Drives |
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Answer» Correct answer is (c) UNIPOLAR & Bidirectional |
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