online mcq EE-Single Phase Motors Part four


Single Phase Motors Part Four (Fill In The Blank)

  1. In capacitor motors, the capacitor is connected in ………………….. with the starting winding.
    Answerseries
  2. In ceiling fans generally …………………. motors are used
    Answercapacitor
  3. In shaded pole motors the shading coil is normally made of ……………….
    Answercopper
  4. A universal motor has …………………. starting torque.
    Answerhigh
  5. The capacitor used on ceiling fans has capacitance of few …………………. farads.
    Answermicro
  6. A shaded pole type motor is generally not used because it has poor …………………
    Answerstarting torque
  7. For high speed and high starting torque ………………….. motor is preferred.
    Answeruniversal
  8. Single phase motors are generally fitted with …………………… bearings.
    Answerball
  9. The running winding of a split phase induction motor has ……………… resistance and ……………………. reactance.
    Answerlow, high
  10. A capacitor motor has ………………….. starting torque than equally rated slip phase induction motor.
    Answerhigher
  11. The starting torque and current taken by a repulsion motor depends on the …………………….. .
    Answerbrush position
  12. The advantage of repulsion motor over other single phase motors is ……………………………
    Answerhigh efficiency
  13. For applications demanding high speed of the order of 5000. rpm, a ………………………. motor is suitable.
    Answeruniversal
  14. For recorded players a …………………. motor is suitable.
    Answerhysteresis
  15. The single phase motor suitable for signal devices is …………………. motor.
    Answerreluctance
  16. The rotor of a hysteresis motor is made of a material having high ……………………. and …………………………
    Answerhysteresis loss, retentivity
  17. In case of hysteresis motors the power factor is ……………….:…….
    Answerlow
  18. If
    8 micro F capacitor is used on 200 W capacitor motor, the value of
    capacitor to be used on 600 W capacitor will be
    …………………………
    Answer20 μF
  19. The ………………………. motor has unsymmetrical rotor.
    Answerreluctance
  20. Any motor may become hot when subjected to ……………………….
    Answeroverload
  21. The
    power factor of an ac series motor can be improved by
    ……………………… the inductance of field and armature
    winding.
    Answerdecreasing
  22. The starting torque of a capacitor motor is …………………………..
    Answerlow
  23. In electric clocks …………………………… motor is used.
    Answersynchronous
  24. Only …………………………… motor is capable of running on ac as well as dc.
    Answeruniversal
  25. The
    speed-torque characteristics of a repulsion induction motor resemble to
    that of dc ……………………………… motor.
    Answercompound
  26. A shaded pole motor has …………………………. initial cost and ……………………… maintenance cost.
    Answerlow, low
  27. Commutator, capacitor and centrifugal switch are not provided in case of …………………….. motor.
    Answershaded pole
  28. Power to weight ratio is highest in case of ……………………. motor.
    Answeruniversal
  29. The stator of a shaded pole motor resembles that of …………………………. motor.
    Answerhysteresis
  30. In shaded pole motors the direction of rotation is from …………………….. pole to ………………………… pole.
    Answermain, shaded
  31. A 22 gauge wire will be ………………………… as compared to a 20 gauge wire.
    Answerthinner
  32. AC series motors of a large size are used in ……………………………
    Answerrailway locomotives
  33. Most of the single phase motors are designed to run in ……………………… horse power range.
    Answerfractional
  34. In capacitor motors, the current is in ……………………… with that in the main winding.
    Answerquadrature
  35. An amplidyne is a …………………………. field machine.
    Answercross
  36. The rotor of a ……………………………. motor has no protrusions, teeth or windings.
    Answerhysteresis
  37. The rotor of a hysteresis motor must be of ……………………… material.
    Answermagnetic
  38. The
    rotating magnetic field in a hysteresis motor magnetizes the metal of
    the rotor and induces ……………………………. within it.
    Answerpoles
  39. In
    a hysteresis motor when the motor reaches synchronous speed, the stator
    flux ceases to sweep across the rotor and the rotor acts like a
    ……………………………..
    Answerpermanent magnet
  40. The characteristics of a universal motor resembles that of dc …………………………. motor.
    Answerseries
  41. Table fan motor ratings arc usually less than …………………………. watts.
    Answer100
  42. A pistol drill is usually fitted with a ………………………….. motor.
    Answeruniversal
  43. Gear trains are often used in ……………………………….. motors to obtain operating speeds.
    Answeruniversal
  44. Ball bearings offer less friction as compared to …………………………… bearings.
    Answerbush
  45. The rotor shaft of a universal motor is made of………………………….
    Answermild steel
  46. The
    direction of rotation of the reluctance start motor is always from the
    ……………………………… air gap to the
    ……………………………… air gap.
    Answerwide, narrow
  47. Hysteresis motors are made in low horse power range usually below ……………………………….. H.P.
    Answer1/100
  48. For the same load a dc series motor will have ………………………… speed as compared to a dc shunt motor.
    Answerhigher
  49. Electronic speed controllers for single phase motors use …………………. and ……………………………
    Answerdiacs, triacs
  50. A
    reluctance motor will operate as sub-synchronous reluctance motor when
    the number of salient poles on the rotor is
    …………………………….. than the number of electrical poles
    on the stator.
    Answergreate
ELECTRICAL ENGINEERING IMPORTANT MCQ-TRANSISTOR BIASING
online mcq EE-Single Phase Motors Part three

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