[amp_mcq option1=”torque will increase” option2=”the motor will consume less power” option3=”motor will run in reverse direction” option4=”motor will continue to run in same direction” correct=”option3″]
Detailed SolutionIn a capacitor start single-phase motor, when capacitor is replaced by a resistance
[amp_mcq option1=”inductor” option2=”capacitor” option3=”resistor” option4=”shading coils” correct=”option4″]
Detailed SolutionIn a shaded pole single-phase motor, the revolving field is produced by the use of
[amp_mcq option1=”capacitor run motor” option2=”hysteresis motor” option3=”universal motor” option4=”repulsion motor” correct=”option3″]
Detailed SolutionThe electric motor used in portable drills is
[amp_mcq option1=”Hysteresis motor” option2=”Reluctance motor” option3=”Capacitor-run motor” option4=”Universal motor” correct=”option4″]
Detailed SolutionWhich of the following motors is used in tape-recorders ?
[amp_mcq option1=”Electric shavers” option2=”Refrigerators” option3=”Signalling and timing devices” option4=”Lifts and hoists” correct=”option4″]
Detailed SolutionFor which of the applications a reluctance motor is preferred ?
[amp_mcq option1=”open armature winding” option2=”shorted armature winding” option3=”shorted field winding?” option4=”high commutator mica E. all of the above” correct=”option1″]
Detailed SolutionIn a universal motor, the most common cause of brush sparking is
[amp_mcq option1=”motor will not come up to speed” option2=”motor will not carry the load” option3=”current drawn by the motor will be excessively high” option4=”electrolytic capacitor will, in all probability, suffer break down” correct=”option3″]
[amp_mcq option1=”disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding” option2=”disconnect motor from supply and immediately reconnect it to supply with reversed con-nections of the main winding” option3=”reverse the direction of connection of the auxiliary winding and after motor comes to rest then connect auxiliary winding to the supply” option4=”reverse the direction of connections of the auxiliary winding and immediately connect it to supply” correct=”option4″]
[amp_mcq option1=”lagging” option2=”always leading” option3=”unity” option4=”unity to 0.8 leading” correct=”option1″]
Detailed SolutionThe power factor of a single-phase induction motor is usually
[amp_mcq option1=”Resistance start” option2=”Capacitor start capacitor run” option3=”Shaded pole” option4=”Universal” correct=”option3″]