–
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