[amp_mcq option1=”provide mechanical balance” option2=”improve power factor and provide better speed regulation” option3=”prevent hunting in the motor” option4=”eliminate armature reaction” correct=”option2″]
Detailed SolutionThe purpose of stator winding in the compensated repulsion motor is to
[amp_mcq option1=”Capacitor run motor” option2=”Shaded pole motor” option3=”Hysteresis motor” option4=”Schrage motor” correct=”option1″]
Detailed SolutionWhich of the following motors can be used for unity power factor ?
[amp_mcq option1=”Universal motor” option2=”Repulsion motor” option3=”as well as” option4=”Reluctance motor” correct=”option1″]
Detailed SolutionWhich of the following motors can be run on AC. as well as D.C. supply ?
[amp_mcq option1=”It cannot be reversed, ordinarily” option2=”It requires no D.” option3=”field excitation for its operation C. It is nothing else but a single-phase, salient pole synchronous-induction motor” option4=”Its squirrel cage-rotor is of unsym-metrical magnetic construction in order to vary reluc-tance path between stator and rotor” correct=”option1″]
Detailed SolutionWhich of the following statements regarding a reluctance motor is incorrect ?
[amp_mcq option1=”95% to 99%” option2=”80% to 90%” option3=”50% to 75%” option4=”5% to 35%” correct=”option2″]
Detailed SolutionThe range of efficiency for shaded pole motors is
[amp_mcq option1=”reduce the effects of armature reaction” option2=”increase the torque” option3=”series motor compensating winding is employed to A. reduce the effects of armature reaction B. increase the torque C. reduce sparking at the brushes” option4=”none of the above” correct=”option1″]
[amp_mcq option1=”Repulsion induction motor” option2=”Repulsion motor” option3=”Repulsion start induction run motor” option4=”None of the above” correct=”option3″]
[amp_mcq option1=”It is extremely sensitive to fluctuations in supply voltage” option2=”Its high starting torque is due to its high rotor hysteresis loss” option3=”It is extremely quiet in operation” option4=”It accelerates from rest to full-speed almost instantaneously” correct=”option4″]
Detailed SolutionWhich of the following statements regarding hysteresis motor is in incorrect ?
[amp_mcq option1=”voltage rating” option2=”dielectric medium” option3=”polarity marking” option4=”definite value” correct=”option3″]
Detailed SolutionThe capacitors used in single-phase capacitor motors have no
[amp_mcq option1=”from main pole to shaded pole” option2=”from shaded pole to main pole” option3=”either of the above depending on voltage” option4=”either of the above depending on power factor” correct=”option1″]
Detailed SolutionIn case of a shaded pole motor the direction of rotation of the motor is