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Single Phase Motors Part Four (Fill In The Blank)
- In capacitor motors, the capacitor is connected in ………………….. with the starting winding.
Answerseries - In ceiling fans generally …………………. motors are used
Answercapacitor - In shaded pole motors the shading coil is normally made of ……………….
Answercopper - A universal motor has …………………. starting torque.
Answerhigh - The capacitor used on ceiling fans has capacitance of few …………………. farads.
Answermicro - A shaded pole type motor is generally not used because it has poor …………………
Answerstarting torque - For high speed and high starting torque ………………….. motor is preferred.
Answeruniversal - Single phase motors are generally fitted with …………………… bearings.
Answerball - The running winding of a split phase induction motor has ……………… resistance and ……………………. reactance.
Answerlow, high - A capacitor motor has ………………….. starting torque than equally rated slip phase induction motor.
Answerhigher - The starting torque and current taken by a repulsion motor depends on the …………………….. .
Answerbrush position - The advantage of repulsion motor over other single phase motors is ……………………………
Answerhigh efficiency - For applications demanding high speed of the order of 5000. rpm, a ………………………. motor is suitable.
Answeruniversal - For recorded players a …………………. motor is suitable.
Answerhysteresis - The single phase motor suitable for signal devices is …………………. motor.
Answerreluctance - The rotor of a hysteresis motor is made of a material having high ……………………. and …………………………
Answerhysteresis loss, retentivity - In case of hysteresis motors the power factor is ……………….:…….
Answerlow - 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 - The ………………………. motor has unsymmetrical rotor.
Answerreluctance - Any motor may become hot when subjected to ……………………….
Answeroverload - The
power factor of an ac series motor can be improved by
……………………… the inductance of field and armature
winding.
Answerdecreasing - The starting torque of a capacitor motor is …………………………..
Answerlow - In electric clocks …………………………… motor is used.
Answersynchronous - Only …………………………… motor is capable of running on ac as well as dc.
Answeruniversal - The
speed-torque characteristics of a repulsion induction motor resemble to
that of dc ……………………………… motor.
Answercompound - A shaded pole motor has …………………………. initial cost and ……………………… maintenance cost.
Answerlow, low - Commutator, capacitor and centrifugal switch are not provided in case of …………………….. motor.
Answershaded pole - Power to weight ratio is highest in case of ……………………. motor.
Answeruniversal - The stator of a shaded pole motor resembles that of …………………………. motor.
Answerhysteresis - In shaded pole motors the direction of rotation is from …………………….. pole to ………………………… pole.
Answermain, shaded - A 22 gauge wire will be ………………………… as compared to a 20 gauge wire.
Answerthinner - AC series motors of a large size are used in ……………………………
Answerrailway locomotives - Most of the single phase motors are designed to run in ……………………… horse power range.
Answerfractional - In capacitor motors, the current is in ……………………… with that in the main winding.
Answerquadrature - An amplidyne is a …………………………. field machine.
Answercross - The rotor of a ……………………………. motor has no protrusions, teeth or windings.
Answerhysteresis - The rotor of a hysteresis motor must be of ……………………… material.
Answermagnetic - The
rotating magnetic field in a hysteresis motor magnetizes the metal of
the rotor and induces ……………………………. within it.
Answerpoles - 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 - The characteristics of a universal motor resembles that of dc …………………………. motor.
Answerseries - Table fan motor ratings arc usually less than …………………………. watts.
Answer100 - A pistol drill is usually fitted with a ………………………….. motor.
Answeruniversal - Gear trains are often used in ……………………………….. motors to obtain operating speeds.
Answeruniversal - Ball bearings offer less friction as compared to …………………………… bearings.
Answerbush - The rotor shaft of a universal motor is made of………………………….
Answermild steel - The
direction of rotation of the reluctance start motor is always from the
……………………………… air gap to the
……………………………… air gap.
Answerwide, narrow - Hysteresis motors are made in low horse power range usually below ……………………………….. H.P.
Answer1/100 - For the same load a dc series motor will have ………………………… speed as compared to a dc shunt motor.
Answerhigher - Electronic speed controllers for single phase motors use …………………. and ……………………………
Answerdiacs, triacs - 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