[amp_mcq option1=”Varying field flux with tapped field windings” option2=”Connecting rheostat in series” option3=”Applying variable voltage by means of silicon controlled rectifier” option4=”All of the above methods” correct=”option4″]
Detailed SolutionSpeed control of a universal motor is achieved by
[amp_mcq option1=”inherently self-starting with high torque” option2=”inherently self-starting with low torque” option3=”inherently non-self-starting with low torque” option4=”inherently non-self-starting with high torque” correct=”option1″]
[amp_mcq option1=”the motor will not start” option2=”the motor will run” option3=”the motor will run in reverse direction” option4=”the motor will run in the same direction at reduced r.p.m.” correct=”option1″]
Detailed SolutionIf the capacitor of a single-phase motor is short-circuited
[amp_mcq option1=”run faster” option2=”spark at light loads” option3=”draw excessive current and overheat” option4=”run slower” correct=”option3″]
[amp_mcq option1=”Capacitor start motor” option2=”Capacitor run motor” option3=”Split phase motor” option4=”Shaded pole motor” correct=”option1″]
Detailed SolutionWhich of the following motor will give relatively high starting torque ?
[amp_mcq option1=”Repulsion motor” option2=”Shaped pole motor” option3=”Capacitor-start motor” option4=”Split-phase motor” correct=”option1″]
Detailed SolutionWhich of the following motors has highest starting torque ?
[amp_mcq option1=”more than rated torque” option2=”rated torque” option3=”less than the rated torque” option4=”zero” correct=”option3″]
Detailed SolutionThe rotor developed by a single-phase motor at starting is
[amp_mcq option1=”Capacitor run motor” option2=”Shaded pole motor” option3=”Capacitor start motor” option4=”Split phase motor” correct=”option1″]
Detailed SolutionWhich of the following motor will have relatively higher power factor ?
[amp_mcq option1=”shunt motor” option2=”series motor” option3=”A. shunt motor B. series motor C. compound motor” option4=”separately excited motor” correct=”option1″]
[amp_mcq option1=”interchanging the supply leads” option2=”position of shaded pole with respect to main pole” option3=”retentivity of the rotor material” option4=”none of these” correct=”option1″]
Detailed SolutionThe direction of rotation of an hysteresis motor is determined by