InterviewSolution

Explore topic-wise InterviewSolutions in .

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.

51.	What is the correct expression of ω?(a) ω=2π(b) ω=2πf(c) ω=πf(d) ω=2f^2I got this question in semester exam.I'd like to ask this question from Representation of an Alternating Quantity by a Phasor in division Alternating Voltage and Current of Basic Electrical Engineering
Answer» The CORRECT answer is (b) ω=2πf The explanation: The correct EXPRESSION for ω is ω=2πf where f is the frequency of the ALTERNATING voltage or CURRENT.

52.	For a direct current, the rms voltage is ________ the mean voltage.(a) Greater than(b) Less than(c) Equal to(d) Not related toI have been asked this question by my college professor while I was bunking the class.This interesting question is from Average and RMS Values of Sinusoidal & Non-Sinusoidal Currents and Voltages topic in section Alternating Voltage and Current of Basic Electrical Engineering
Answer» Right option is (C) EQUAL to Best explanation: For a direct current, the MEAN VOLTAGE value is the same as that of the RMS voltage.

53.	What is the type of current obtained by finding the square of the currents and then finding their average and then fining the square root?(a) RMS current(b) Average current(c) Instantaneous current(d) Total currentThe question was posed to me in examination.This intriguing question comes from Average and RMS Values of an Alternating Current topic in portion Alternating Voltage and Current of Basic Electrical Engineering
Answer» Right OPTION is (a) RMS CURRENT For explanation I would say: RMS stands for Root Mean Square. This value of current is obtained by SQUARING all the current values, finding the AVERAGE and then finding the square root.

54.	What is the duration of one cycle known as _________(a) Waveform(b) Peak value(c) Instantaneous value(d) PeriodThis question was addressed to me in unit test.This question is from Waveform Terms and Definitions in chapter Alternating Voltage and Current of Basic Electrical Engineering
Answer» Correct option is (d) PERIOD The BEST explanation: The duration of one cycle is known as a period. A function which repeats the same waveform at equal INTERVALS of TIME is known as a PERIODIC function.

55.	Ammeters and voltmeters are calibrated to read?(a) RMS value(b) Peak value(c) Average value(d) Instantaneous valueI got this question in my homework.My question is from Phasor Diagrams Drawn with RMS Values Instead of Maximum Values topic in division Alternating Voltage and Current of Basic Electrical Engineering
Answer» RIGHT OPTION is (a) RMS value The BEST I can explain: AMMETERS and voltmeters are calibrated to read the rms value because the rms value is the most accurate than average value.

56.	Calculate the crest factor if the peak value of current is 10A and the rms value is 2A.(a) 5(b) 10(c) 5A(d) 10AThe question was asked in final exam.The query is from Average and RMS Values of an Alternating Current topic in chapter Alternating Voltage and Current of Basic Electrical Engineering
Answer» Correct option is (a) 5 For explanation I would say: We KNOW that: Crest factor = Peak value/RMS value. Substituting the values from the GIVEN QUESTION, we get crest factor=5.

57.	If Im is the maximum value of a sinusoidal voltage, what is the instantaneous value?(a) i=Im/2(b) i=Imsinθ(c) i=Imcosθ(d) i=Imsinθ or i=ImcosθThis question was posed to me during an interview.This intriguing question comes from Average and RMS Values of Sinusoidal & Non-Sinusoidal Currents and Voltages in section Alternating Voltage and Current of Basic Electrical Engineering
Answer» Right CHOICE is (d) i=Imsinθ or i=Imcosθ Explanation: The instantaneous value of a sinusoidal VARYING current is i=Imsinθ or i=Imcosθ where IM is the maximum value of current.

58.	Which is the correct formula for frequency in an ac generator?(a) f=p*n(b) f=p/n(c) f=n/p(d) f=n^2pThe question was asked in an international level competition.I need to ask this question from Relationship between Frequency, Speed and Number of Pole Pairs topic in chapter Alternating Voltage and Current of Basic Electrical Engineering
Answer» CORRECT ANSWER is (a) f=Pn The EXPLANATION: The frequency in an ac generator is pn, where p is pairs of poles and SPEED is n revolutions per second.

59.	The maximum instantaneous value measured from zero value is known as?(a) Peak value(b) Peak to peak value(c) Cycle(d) PeriodThis question was posed to me during an interview.Enquiry is from Waveform Terms and Definitions in section Alternating Voltage and Current of Basic Electrical Engineering
Answer» Right OPTION is (a) PEAK value Easy explanation: The maximum instantaneous value MEASURED from the ZERO value is TERMED as the peak value.

60.	The repetition of a variable quantity, recurring at equal intervals, is known as ___________(a) Waveform(b) Instantaneous value(c) Cycle(d) PeriodThe question was posed to me in a national level competition.Query is from Waveform Terms and Definitions in division Alternating Voltage and Current of Basic Electrical Engineering
Answer» Right OPTION is (c) Cycle Easy EXPLANATION: Each REPETITION of a variable quantity, recurring at equal INTERVALS, is termed as a cycle.

61.	What is the correct expression for the rms value of current?(a) Irms=Im/2(b) Irms=Im/√2(c) Irms=Im/4(d) Irms=ImThis question was posed to me in unit test.My question is taken from Average and RMS Values of Sinusoidal & Non-Sinusoidal Currents and Voltages topic in portion Alternating Voltage and Current of Basic Electrical Engineering
Answer» RIGHT ANSWER is (B) Irms=Im/√2 To EXPLAIN: Irms^2 = ∫0^πdθ i^2/2π = Im^2/2 Irms=Im/√2.

62.	For a rectangular wave, average current is ______ rms current.(a) Greater than(b) Less than(c) Equal to(d) Not relatedI had been asked this question in an international level competition.My question comes from Average and RMS Values of an Alternating Current in chapter Alternating Voltage and Current of Basic Electrical Engineering
Answer» The correct answer is (c) Equal to The explanation: The rms value is ALWAYS greater than the AVERAGE EXCEPT for a RECTANGULAR wave, in which the HEATING effect remains constant so that the average and the rms values are the same.

63.	emf is zero if the angle between velocity and length is _____(a) 0^0(b) 90^0(c) 270^0(d) 45^0I had been asked this question during an online interview.My doubt stems from Generation of an Alternating EMF in portion Alternating Voltage and Current of Basic Electrical Engineering
Answer» RIGHT choice is (a) 0^0 Best EXPLANATION: If the ANGLE between velocity and length is zero, sinθ=0 So, e=Bvlsinθ = 0.

64.	When a coil is rotated in a magnetic field, the emf induced in it?(a) Is maximum(b) Is minimum(c) Continuously varies(d) Remains constantThe question was asked in an online quiz.The query is from Generation of an Alternating EMF in portion Alternating Voltage and Current of Basic Electrical Engineering
Answer» Right answer is (c) Continuously varies To EXPLAIN: When a coil is ROTATED in a MAGNETIC FIELD, CROSS sectional area varies due to which the number of flux lines crossing it varies, which causes the emf to vary continuously.