Most of the fractional horsepower motors have either___________?
Most of the fractional horsepower motors have either___________? A. hard and annealed bearings B. ball or roller bearings C. soft and porous bearingsD. plain or sleeve bearings
Most of the fractional horsepower motors have either___________? A. hard and annealed bearings B. ball or roller bearings C. soft and porous bearingsD. plain or sleeve bearings
In a universal motor, the most common cause of brush sparking is___________? A. open armature winding B. shorted armature winding C. shorted field winding” D. high commutator micaE. all of the above
Which of the following statements regarding reluctance-start motor is incorrect ? A. It is similar to reluctance motor B. It is basically an induction motor and not a synchronous one C. So far as its basic working principle is concerned,…
If starting winding of a single-phase induction motor is left in the circuit, it will____________? A. run faster B. spark at light loadsC. draw excessive current and overheat D. run slower
If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then____________? A. motor will not come up to speed B. motor will not carry the load C. current drawn by the motor will be excessively…
Which of the following statements regarding two value capacitor motor is incorrect ? A. It is a reversing motorB. It is preferred to permanent-split single-value capacitor motor where frequent reversals are required C. It has low starting as well as…
If a single phase induction motor runs slower than normal, the most likely defect is_____________? A. worn bearings B. short-circuit in the winding C. open-circuit in the winding D. none of the above
Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because_____________? A. it is comparatively cheaper B. it has almost non-destructible capacitorC. it has low starting as well as running currents at relatively high power factor D.…
Which of the following motors is used in tape-recorders ____________? A. Hysteresis motor B. Reluctance motor C. Capacitor-run motor D. Universal motor
Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a___________? A. magnetic relay B. thermal relay C. centrifugal switch D. none of the above