Related InterviewSolutions

• The slope of the V-I curve is 19°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.(a) .3254 Ω(b) .3608 Ω(c) .3543 Ω(d) .3443 ΩI got this question in an online interview.My query is from DC Motors topic in chapter Characteristics of DC & AC Motors of Electric Drives
• Calculate the phase angle of the sinusoidal waveform z(t)=78sin(456πt+2π÷78).(a) π÷39(b) 2π÷5(c) π÷74(d) 2π÷4This question was posed to me by my college professor while I was bunking the class.Question is from DC Motors topic in section Characteristics of DC & AC Motors of Electric Drives
• Calculate the active power in an 8 Ω resistor with 8 A current flowing through it.(a) 512 W(b) 514 W(c) 512 W(d) 518 WThe question was asked in semester exam.This question is from DC Motors in chapter Characteristics of DC & AC Motors of Electric Drives
• A 3-phase induction motor runs at almost 1500 rpm at no load and 900 rpm at full load when supplied with power from a 50 Hz, 3-phase supply. What is the corresponding speed of the rotor field with respect to the rotor?(a) 300 revolution per minute(b) 400 revolution per minute(c) 600 revolution per minute(d) 500 revolution per minuteThe question was posed to me in semester exam.The above asked question is from DC Motors topic in portion Characteristics of DC & AC Motors of Electric Drives
• For a practical synchronous motor, the pull-out torque will occur when the torque angle is nearly equal to ________(a) 0°(b) 30°(c) 45°(d) 75°I have been asked this question during an interview.Asked question is from DC Motors in division Characteristics of DC & AC Motors of Electric Drives
• In an induction motor, when the number of stator slots is not equal to an integral number of rotor slots _________(a) There may be a discontinuity in torque slip characteristics(b) A high starting torque will be available(c) The machine performs better(d) The machine may fail to startI had been asked this question in an international level competition.This is a very interesting question from DC Motors in portion Characteristics of DC & AC Motors of Electric Drives
• The slope of the V-I curve is 7°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.(a) .122 Ω(b) .360 Ω(c) .377 Ω(d) .578 ΩI had been asked this question in quiz.The origin of the question is DC Motors topic in division Characteristics of DC & AC Motors of Electric Drives
• In a synchronous machine, the phase sequence can be reversed by reversing the _________(a) Rotor direction(b) Field polarities(c) Armature terminal(d) Rotor direction and armature terminalThe question was asked in final exam.My doubt stems from DC Motors topic in chapter Characteristics of DC & AC Motors of Electric Drives
• Which of the following are used in preventing the hunting phenomenon in synchronous generators?(a) Damper bars(b) Short pitch chords(c) Distributed winding(d) Damper bars and short pitch chordsThis question was addressed to me in class test.This intriguing question comes from DC Motors topic in division Characteristics of DC & AC Motors of Electric Drives
• The hunting phenomenon in a synchronous motor is also referred to as _________(a) Surging(b) Phase swinging(c) Cogging(d) Surging and phase swingingThe question was asked in quiz.My doubt is from DC Motors topic in chapter Characteristics of DC & AC Motors of Electric Drives