can u tell me how to get answer to 7.) a. squirrel cage motors with two speeds;b.wound rotor motors with four speeds;c. synchronous motors with two speeds;d squirrel cage motors with a constant speed.5. Motors with two speeds on one winding are calleda. separate winding motors3;b consequent pole motors;C. two-speed motors;d. multispeed motors.6. A two-speed starter with reversing control can start a motor ina. the forward direction at high speed;b. the reverse direction at high speed;c either direction at low speed;d. reverse direction at low speed.7. How many pairs of poles are required to operate a 60 Hz, 120 V motor at900 r/min?a. 2b. 4d. 8

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Engineering

Electrical Engineering

7. How many pairs of poles are required to operate a 60 Hz, 120 V motor at 900 r/min?

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter33: Single-phase Motors

Section: Chapter Questions

Problem 16RQ: When a repulsion-start induction-run motor reaches about 75% of rated full-load speed, it stops...

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Concept explainers

Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors. The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.

Question

can u tell me how to get answer to 7.)

a. squirrel cage motors with two speeds;
b.
wound rotor motors with four speeds;
c. synchronous motors with two speeds;
d squirrel cage motors with a constant speed.
5. Motors with two speeds on one winding are called
a. separate winding motors3;
b consequent pole motors;
C. two-speed motors;
d. multispeed motors.
6. A two-speed starter with reversing control can start a motor in
a. the forward direction at high speed;
b. the reverse direction at high speed;
c either direction at low speed;
d. reverse direction at low speed.
7. How many pairs of poles are required to operate a 60 Hz, 120 V motor at
900 r/min?
a. 2
b. 4
d. 8

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When a repulsion-start induction-run motor reaches about 75% of rated full-load speed, it stops operating as a repulsion motor and starts operating as a squirrel-cage motor. What must be done to cause the motor to begin operating as a squirrel-cage motor?
17. A single-phase, 120 V, 60 Hz, four-pole, split-phase induction motor gave the following blockedrotor test data:VIP Main winding 32 4 80Auxiliary winding 40 4 128a) Determine the standstill impedances of the main and auxiliary windings.b) Determine the values of the resistances to be added in series with the auxiliary winding to obtain maximum starting torque.c) Compare the starting torques and starting currents with and without the added resistance in the auxiliary winding circuit if the motor is connected to a 120 V, 60 Hz supply
11.a. If an a-c system requires a 250-hp motor to drive a machine at a uniform rate of speed, what type ofmotor should be used?A. Induction motorB. Squirrel-cage motorC. Synchronous motorD. Wound-rotor motor11.b. If a gear unit is used with an a-c motor to increase the speed by a ratio of 4 to 1, then the torqueapplied to the system isA. increased by 4 to 1.B. decreased by 2 to 1.C. increased by 2 to 1.D. decreased by 4 to 1.
424. What is the value of the slip of an induction motor at rated speed?
a) Why do we use asynchronous word for asynchronous (induction) motors? b) How are the three-phase windings placed in the stator of induction motors from the point of magnetic field axis? c) What is the purpose of the winding ends taken to the outside in the wound-rotor induction motors? d) In the cage structure rotors, in which mechanism are the bar conductors short-circuited? Please answer all. Just two to three lines of answer for each is enough
18.a. For a repulsion motor with bmshes set in the neutral position, what type of winding is needed toproduce starting torque?A. A starting windingB. An inducing windingC. A squirrel-cage windingD. A capacitor-phase winding18.b. If there is only one auxiliary winding in a two-speed capacitor start motor, the motor has toA. start with the low-speed main winding and with the control switch in the low-speed position.B. be stopped whenever the speed is changed.C. use a speed-selecting control switch and a two-position starting switch.D. reverse the direction of rotation when it changes speed.
1. Why the rotor flux is lagging with respect to stator flux of an induction motor? 2. How does a single-phase induction motor act as a two-phase motor? Is it required for starting of the single-phase induction motor?
When a-c voltage is first applied to a large squirrel-cage induction motor and the rotor has not yet begun to rotate, there is A. full pull-out torque.B. maximum initial slip.C. zero locked-rotor current. D. minimum starting resistance.
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23. As load is increased from no load to full load on a 3-phase squirrel-cage induction motor, what happens to the ... A) slip of the motor? a) increases b) decreases c) remains the same d) none of the above B) speed of the motor? a) increases b) decreases c) remains the same d) none of the above C) torque of the motor? a) increases b) decreases c) remains the same d) none of the above D) stator current of the motor? a) increases b) decreases c) remains the same d) none of the above E) power factor of the motor?a)improves, b)get poorer, c)remains the same, d)none of aboveF) efficiency of the motor?a)increases b)decreases c) remains the same d) none