Related InterviewSolutions

• For which of the following operations a DC motor is preferred over an AC motor?(a) Low speed operation(b) High speed operation(c) Variable speed operation(d) Fixed speed operationThis question was posed to me in an online interview.My question is from Applications of DC Machines in chapter DC Machines of DC Machines
• Which motor is preferred in highly explosive atmosphere?(a) Air motor(b) Shunt motor(c) Series motor(d) Battery operated motorThis question was addressed to me in an online quiz.Enquiry is from Applications of DC Machines topic in portion DC Machines of DC Machines
• Which of the following motor can replace DC series motor?(a) DC shunt motor(b) Cumulative compound motor(c) Wound-rotor induction motor(d) Synchronous motorThe question was asked during an interview.I want to ask this question from Applications of DC Machines in section DC Machines of DC Machines
• Nowadays, DC motor is widely used only in ____________(a) Pumping sets(b) Air compressors(c) Electric traction(d) Machine shopsI had been asked this question at a job interview.Asked question is from Applications of DC Machines topic in chapter DC Machines of DC Machines
• Which motor has almost replaced DC shunt motor from its applications?(a) Wound-rotor induction motor(b) Differential compound motor(c) Air motor(d) Squirrel caged induction motorI have been asked this question by my college professor while I was bunking the class.My question is based upon Applications of DC Machines topic in division DC Machines of DC Machines
• Maximum torque in a DC machine is limited by ______________(a) Commutation(b) Heating(c) Losses other than heating(d) StabilityI have been asked this question in an interview.The question is from Applications of DC Machines topic in section DC Machines of DC Machines
• Which of the following load application normally needs starting torque more than the rated torque?(a) Blowers(b) Conveyors(c) Air compressors(d) Centrifugal pumpsI had been asked this question during an internship interview.Asked question is from Applications of DC Machines in section DC Machines of DC Machines
• Why are the DC motors preferred for traction applications?(a) Torque and speed are inversely proportional to armature current(b) Torque is proportional to armature current(c) Torque is proportional to square root of armature current(d) The speed is inversely proportional to the torque and the torque is proportional to square of armature currentI have been asked this question in an online quiz.Enquiry is from Applications of DC Machines in division DC Machines of DC Machines
• Separately excited DC generators are still used in _________________(a) Thermal power plants(b) Ward Leonard speed control system(c) Hydro power plant(d) In all fieldsThis question was addressed to me in final exam.Question is taken from Applications of DC Machines in portion DC Machines of DC Machines
• In world today, around 25% of the motors are manufactured are DC motors.(a) True(b) FalseI got this question during an interview.My question is based upon Applications of DC Machines topic in division DC Machines of DC Machines