[amp_mcq option1=”centrifugal switch” option2=”capacitor” option3=”commutator” option4=”all of the above” correct=”option4″]
Single phase induction motors
42. Locked rotor current of a shaded pole motor is
[amp_mcq option1=”equal to full load current” option2=”less than full load current” option3=”slightly more than full load current” option4=”several times the full load current” correct=”option4″]
Detailed SolutionLocked rotor current of a shaded pole motor is
43. The speed of a universal motor is generally reduced by using
[amp_mcq option1=”gear trains” option2=”V-belts” option3=”brakes” option4=”chains” correct=”option1″]
Detailed SolutionThe speed of a universal motor is generally reduced by using
44. Most of the fractional horsepower motors have either
[amp_mcq option1=”hard and annealed bearings” option2=”ball or roller bearings” option3=”soft and porous bearings” option4=”plain or sleeve bearings” correct=”option2″]
Detailed SolutionMost of the fractional horsepower motors have either
45. The speed/load characteristics of a universal motor is same as that of
[amp_mcq option1=”D.C. motor” option2=”D.” option3=”motor B.” option4=”none of the above” correct=”option4″]
Detailed SolutionThe speed/load characteristics of a universal motor is same as that of
46. If a single phase induction motor runs slower than normal, the most likely defect is
[amp_mcq option1=”worn bearings” option2=”short-circuit in the winding” option3=”open-circuit in the winding” option4=”none of the above” correct=”option3″]
47. In split phase motor main winding is of
[amp_mcq option1=”thin wire placed at the top of the slots” option2=”thin wire placed at the bottom of the slots” option3=”thick wire placed at the bottom of the slots” option4=”thick wire placed at the top of the? slots” correct=”option1″]
48. A shaded pole motor can be used for
[amp_mcq option1=”toys” option2=”hair dryers” option3=”circulators” option4=”any of the above” correct=”option1″]
49. The repulsion start induction run motor is used because of
[amp_mcq option1=”good power factor” option2=”high efficiency” option3=”minimum cost” option4=”high starting torque” correct=”option4″]
Detailed SolutionThe repulsion start induction run motor is used because of
50. Which of the following motors is used in a situation where load increases with speed ?
[amp_mcq option1=”Induction motor” option2=”Three-phase series motor” option3=”Schrage motor” option4=”Hysteresis motor” correct=”option1″]