[amp_mcq option1=”D.C. series motor” option2=”synchronous motor” option3=”series motor B. synchronous motor C. Squirrel cage induction motor” option4=”Wound round induction motor” correct=”option2″]
Detailed SolutionWhich of the following motors is non-self starting ?
[amp_mcq option1=”pony motor” option2=”D.” option3=”compound motor C. providing damper winding” option4=”any of the above” correct=”option1″]
[amp_mcq option1=”remain same” option2=”go down” option3=”improve” option4=”none of the above” correct=”option2″]
[amp_mcq option1=”1%” option2=”0.50%” option3=”positive” option4=”zero” correct=”option4″]
Detailed SolutionThe speed regulation of a synchronous motor is always
[amp_mcq option1=”d.c. shunt motor” option2=”d.c. series motor” option3=”d.c. compound motor” option4=”induction motor E. synchronous motor” correct=”option1″]
[amp_mcq option1=”will refuse to start” option2=”will overheat in spots” option3=”will not come upto speed” option4=”will fail to pull into step” correct=”option1″]
Detailed SolutionIf one-phase of a 3-phase synchronous motor is short-circuited, motor
[amp_mcq option1=”a series motor” option2=”an induction motor” option3=”an alternator” option4=”a rotary converter” correct=”option3″]
Detailed SolutionThe construction of a synchronous motor resembles
[amp_mcq option1=”The increased load has to take more current” option2=”The rotor by shifting its phase backward causes motor to take more current” option3=”The back e.m.f. decreases causing an increase in motor current” option4=”The rotor strengthens the rotating field causing more motor current” correct=”option3″]
[amp_mcq option1=”D.C. motor” option2=”Reluctance motor” option3=”motor B. Reluctance motor C. Universal motor” option4=”Synchronous motor” correct=”option4″]
[amp_mcq option1=”supply voltage fluctuates” option2=”load in motor varies” option3=”excitation winding gets disconnected” option4=”supply voltage frequency changes” correct=”option3″]