f- The simplicity in construction of a single-stack VR step motor is due to number of phases, 2. Low used voltage, 3. N, N, 4. Bidirectional rotation, previous. 1. g- The synchronous inductor motor has the ability to step when the phase windings are Connected in parallel, 2. Connected in series, 3. Connected in star, 4. Energized with dc, 5- None of previous. h- The speed of multiple-stack VR step motor with continuous stepping is ............. 1. 120f 60f 3. 4.65- None of previous. 120f 2p j- The frequency of armature current in 1-phase series motor is 5- None of previous. (f is the supply frequency) 1. Low 5- None of " ***** 2. 60f 2p i- Resonance conditions distort the torque/speed curve causing a ............ in torque. 1. Increase, 2. Drop, 3. Ripple, 4. Fluctuation, 5- None of previous. 1. f, 2. f, 4. Zero,

f- The simplicity in construction of a single-stack VR step motor is due to number of phases, 2. Low used voltage, 3. N, N, 4. Bidirectional rotation, previous. 1. g- The synchronous inductor motor has the ability to step when the phase windings are Connected in parallel, 2. Connected in series, 3. Connected in star, 4. Energized with dc, 5- None of previous. h- The speed of multiple-stack VR step motor with continuous stepping is ............. 1. 120f 60f 3. 4.65- None of previous. 120f 2p j- The frequency of armature current in 1-phase series motor is 5- None of previous. (f is the supply frequency) 1. Low 5- None of " ***** 2. 60f 2p i- Resonance conditions distort the torque/speed curve causing a ............ in torque. 1. Increase, 2. Drop, 3. Ripple, 4. Fluctuation, 5- None of previous. 1. f, 2. f, 4. Zero,

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

See similar textbooks

Similar questions

List several methods for starting synchronous motors. Check all that apply. Start the motor as an induction motor relying on the amortisseur conductors to produce torque. Use a prime mover to bring the motor up to synchronous speed before connecting the source. Synchronous motors can start without being driven, or having their rotor connected in the form of a self-starting circuit. Use an electronic system to convert 60-Hz power into three-phase ac of variable frequency. Start with a frequency of one hertz or less and then gradually increase the frequency. no chat GPT HAND WRITTEN PLEASE
Draw Block diagram and transfer function of DC series motors
Ql: A single-phase induction motor is rotating at a speed of 1790 rpm. Its rated nameplate is; 150-V, 60-Hz, 4-pole. Determine its per-unit slip (a) in the direction of rotation and (b) in the opposite direction. At standstill the rotor resistance is 13 N, determine the effective rotor resistance in each branch. Q2: A single-phase induction motor with a 4-pole, 50-Hz, 130-V, is rotating in the clockwise direction at a speed of 1450 rpm. Determine its per-unit slip (a) in the direction of rotation and (b) in the opposite direction. At standstill the rotor resistance is 15 Q, determine the effective rotor resistance in each branch.
Q3
TOPIC: AC Machines - Induction Motor 2. A 3-phase, 50 Hz, P=4 slip ring IM has a star connected rotor. The full load speed of the motor is 1460 rpm. The rotor resistance and standstill reactance per phase are 0.1 ohm and 1.5 ohm, respectively. The open circuit voltage on open circuit between the slip rings is 90 volts. Find: (A) Rotor current, and (B) Full load power factor.
Calculate and plot the torque-speed characteristics for a four-pole induction motor. Themotor parameters are rs = 24.5 Ω, rr =23 Ω, Xs = 10 Ω, Xr = 40 Ω, and Xm = 25 Ω. Therated voltage is 110 V. The maximum frequency of the supplied phase voltages is fmax =60 Hz. Assume the phase voltages are supplied with frequencies 20, 40 and 60 Hz. ...
ii) Analyse the superiority of the V/f method of speed control for three phase Induction Motor With the help of equations.
im curious about #5 but its based on #4!
Single phase induction motor performance characteristics 6. Explain double revolving field theory.
B) fill in the blanks : 1) When a synchronous motor is running at synchronous speed, the damper winding Produces...... torque. 2)The maximum power in cylindrical and salient pole machines is obtained respectively at load angles of...... 3)The primary winding of a 220/6 V, 50 Hz transformer is energized from 110 V, 60 Hz supply. The secondary output voltage will be.... 4)The relative speed between the magnetic fields of stator and rotor under steady state operation is zero for a.....machines. 6 G
What is the reason of the high starting current in the 3-phase induction motor? Explain in short.
4. A four-pole, single-phase, 120 V, 60 Hz induction motor gave the following standstill impedances when tested at rated frequency: Main winding : Zm =1.5+j4 ohms Auxiliary winding : Za =3+j6 ohms a) Determine the value of external resistance to be inserted in series with the auxiliary winding to obtain maximum starting torque as a resistor split-phase motor. b) Determine the value of the capacitor to be inserted in series with the auxiliary winding to obtain maximum starting torque as a capacitor-start motor. c) Determine the value of the capacitor to be inserted in series with the auxiliary winding to obtain maximum starting torque per ampere of the starting current as a capacitor-start motor. d) Compare the starting torques and starting currents in parts (a), (b), and (c) expressed as per unit of the starting torque without any external element in the auxiliary circuit, when operated at 120V, 60HZ.