n flux control method the speed of DC motor is obtained O Both above and below base speed O Above Base speed O Remain constant O Below base speed
Q: A three phase induction motor rotates at speed of 1455 r.p.m. when its synchronous s 1500 rpm. Find…
A: In this question we need to find a speed of stator with respect to rotor field.
Q: Speed control of a 140 V, 1.68 kW DC motor şingle phase thyristor full wave AC-DC It is made by the…
A: Given details are Motor is permanent magnet DC motor. It is controlled by single phase full wave…
Q: The induced torque in dc motors beyond the pole edges is Select one: O a. infinity Ob. 180 V OC. 220…
A: The diagram of the dc motor loop segment connected to the external source is shown below: The…
Q: A three phase,22 kilowatt ,three-phase induction motor has a full load speed of 1440 r.p.m. If the…
A: Given data, P = 22 kW. N = 1440 rpm. τf=150%.
Q: 6- Which of the following supply is given to the rotor winding of 3-Phase Induction Motor: a) DC…
A: 3 - phase induction motor problems
Q: The induced voltage in dc motors beyond the pole edges is Select one: O a. infinity Ob. 180 V OC.…
A: induced voltage=eind=(BxV).leind=(BxV).leind=BVlSinθB=Magnetic feildV=Velocityl=Lengthθ=angle…
Q: The rotor of a stepper motor has no O (d) all of the answers O (c) brushes O (b) commutator windings
A: As per Bartleby guidelines we are allowed to solve only one question, please ask the rest again.
Q: 6. The motion in DC motor can be increased by the following factors... (yc may choose more than one)…
A:
Q: The more used type of induction motors in industry is Select one: O a No one of mentioned answers O…
A: Induction motor: it works based on principle of electromagnetic induction Principle: whenever a…
Q: A 3-phase induction motor has a starting torque 100% and a maximum torque of 200% of the full load…
A:
Q: 1. Slip ring induction motors need maintenance. 2. When the load torque on the induction motor…
A: a)Slip ring induction motors needs maintenance: Slip ring induction motors needs…
Q: In the brushless induction motor, one of the following can be used to reduce the starting current…
A:
Q: 2300 V 428 hp 60 Hz 8-pole synchronous motor has an efficiency of 85 percent Under this condition,…
A:
Q: A three-phase star connected six-pole induction motor has the following parameters. Ri =0.294 n;R1…
A:
Q: QUA) Fill in the blanks: 1. Laminations of core are generally made of..... d. In case of the…
A: As per the policy I have attended first three sub parts of the first question 1) Lamination is…
Q: The starting current of a 3-o induction motor is 5 times the rated current, while the rated slip is…
A:
Q: The torque developed by a dc series motor is 44 N-m when drawing 17 A. If the current is doubled,…
A:
Q: For a DC motor, the speed approaches to 1500 rpm when the time approaches to the infinity, the…
A: DC machine is not used in the present time. The commutator is the main part of the DC machine. The…
Q: 17 Slip against Torque 90 80- 70- 60 50 40 30 20 10 0.4 0.6 0.9 0.5 Slip 01 0.2 0.3 0.7 0.8 In the…
A: Given: Characteristic graph:
Q: The torque developed by a dc series motor is 32 N-m when drawing 17 A. If the current is doubled,…
A:
Q: on motor has a full-load slip of 4%. D.12 per phase respectively. Find (i) th maximum torque to…
A: In this question we will find speed at which maximum torque occur in induction motor...
Q: The induced voltage in dc motors beyond the pole edges is Select one a. infinity O b. 180 V Oc. 220…
A: Solution- The induced voltage in a dc motor beyond the pole edges is zero.
Q: A value of magnetizing current in a 3-phase induction motor * gives power factor smaller .. larger…
A: as magnetizing current increses power factor decreases. so A large value of magnetising current in a…
Q: Induction motor at standstill condition has the motor speed (nm) and slip (s): Select one: Oa.…
A:
Q: The starting current of three phase Induction Motor of a 45hp, 400V, code-letter M (10- 11KVA/hp):…
A: Given a three phase induction motor having rated Power, P = 45 hp = 45 × 746 = 33570 Watt Voltage, V…
Q: Which of the following can be slip of a braking AC induction motor? O A)0.8 O B) 1.2 O C) 0.8 O D)O
A: the induction motor value of the slip in the motoring mode should be less than 1
Q: 26. A 4-pole, 50 Hz induction motor operates at 5% slip. The frequency of e.m.f. induced in the…
A: Given, A 3-phase induction motor with Total number of pole, P = 4 Motor supply frequency, f = 50 Hz…
Q: The speed of dc series motor at no load is 1. Zero 2. Infinity 3. Approximately 3000 rpm 4.…
A: For a dc series motor Back emf, E=V-IaRa+Rse And E=kaϕseωm ϕse∝Ia So,…
Q: 3.8 An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50 Hz, the emf…
A: we need to deteremine emf in the rotor frequency.
Q: A 220 V shunt motor has an armature resistance of 0.2 N and a field resistance of 110 2. The motor…
A: Since we only answer up to 3 sub-parts, we’ll answer the first 3. Please resubmit the question and…
Q: A three-phase star connected six-pole induction motor has the following parameters. R 0.294 ; R…
A: A three-phase star connected six-pole induction motor has the following parameters. R =0.294 ; R…
Q: The torque developed by a dc series motor is 12 N-m when drawing 23 A. If the current is doubled,…
A: Need to find new torque
Q: A 220 V. 50 Hz. 4 pole. 1440 rpm single phase induction motor has: R,=52. R; - 5.6 2. X120 2. X, X;…
A: synchronous speed is Ns=120×504=1500 rpm slip is s=1500-14401500=0.04
Q: Q22. A stepper motor with 1.5° step angle is having the stepping frequency 1200 pulses per second.…
A: Write the given values. step angle=a=1.5°stepping frequency=fz=1200 Hz
Q: An increase in the torque angle a results in: O A. No change in the induced torque O B. Decreasing…
A: The solution is given below is
Q: The torque developed by a dc series motor is 16 N-m when drawing 23 A. If the current is doubled,…
A: Given data:
Q: The speed control of shunt motor is N = (V-laRa)/ Ф. Select one: O True O False
A: the speed of shunt motor is given by: N = (V-IaRa)/kФ Where V: the voltage applied across the…
Q: B: A 480V 60 Hz ,6 pole 3 phase star-connected induction motor has the following parameters:…
A:
Q: Mechanical power developed in Induction motor is ___than Output power .(estimated time 1 minute) a.…
A: The explanation is as follows.
Q: At rest condition, the slip of induction motor is 0. Select one: True O True O False In DC series…
A: In this answer we will try to say whether the given statement is true or false and find what happens…
Q: In the DC Shunt motor, when the load increases Speed decreases. Select one: O True O False
A: True
Q: 2. An increase in the air gap length of the induction motor causes O increase in the vibration and…
A: In this question we will write effect of increase of air gap length in induction motor.....
Q: Q5.A 50 HZ, 4-poles star connected induction motor has a slip=0.04 & Pout=20hp find: (1).Synchronous…
A: As per our company guidelines we are supposed to answer only first 3 subpart kindly repost the other…
Q: Q22. A stepper motor with 3" step angle is having the stepping frequency 1500 pulses per second. Wha…
A:
Q: Skewing of rotor conductors in a squirrel cage induction motor reduces O a. heat developed while…
A: Effect of Skewing of rotor conductor in a squirrel cage induction machine? Which quantity is reduce…
Q: The use of a series capacitor with the auxiliary windings of a single-phase induction motor permits:…
A:
Q: In order to get higher speed of Dc motor ..... ..... .. voltage supply most be low O back emf (Eb)…
A: In a DC Shunt motor, the expression for back EMF is, Back EMF(Eb) = NϕZ60×PAN = Eb(60)ϕ×AP
Q: An induction motor is an example of O stepper motor O asynchronous machine O DC machine O…
A: From given list of motors, Stepper motor comes under special purpose machine. DC motor and DC…
Q: The frequency of rotor current in a 6-pole, 50 Hz, 3-phase induction motor running at 950 r.p.m. is…
A: Given: A three-phase induction motor with, Number of pole, P = 6 Frequency, f = 50 Hz Rotor speed,…
Q: A 4 pole induction machine is working as an induction generator. The generator supply frequency is…
A: Given an induction machine working as induction generator having, Total number of pole, P = 4…
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- Varying the DC voltage to the rotor field changes the a. motor speed. b. power factor. c. phase excitation. d. slip.In induction motor, speed ___ with increase in load. a.decreases b.constant c.as same as d.increasesA 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor current a. 48 Hz b. 2 Hz c. 50 Hz d. 100
- A six pole induction motor is connected to a 25Hz supply and at full load the rotor emf makes 105 complete cycles in 2 minutes. Find the percentage slip.During the starting of a synchronous motor, the common practice is to A. open the circuit of the damper winding.B. place a resistance across the field winding..C. apply d-c field excitation immediately. D. leave the field open-circuited..The rotor circuit of a wound-rotor motor becomes more inductive as the resistance is removed, causing the ________ to increase. a. Impedance b. Output voltage c. Phase angle d. Torque
- 8- The frequency of induction motor is 50 Hz and the slip is 2.5% then frequency of rotor current is a. 1.25 HZ b. 1.5 HZ c. 1.2 HZ d. 1 HzFill in the following blanks 1.In order to have sparklesscommutation, the brushes should be placed along................. 2.D.C. series motor are used in those applications where...............starting torque is requiredA “Three Phase Induction Motor” is a very popular electrical Motor used in many types of industries because of _____. a. Simple construction b. Less maintenance. c. All of the Choices d. Low cost
- A 3 phase 4 pole 400Volt 50 Hz induction motor is operating with slip 0.03 what is value of speed of rotor flux with respect to rotor in mechanical (rad/sec).In a single phase AC capacitor start and run induction motor, the starting torque is given by __________________. a. capacitor along with running coil. b. capacitor along with starting coil. c. capacitor. d. magnetic fluxutput power in induction motor is a.rotor output - friction and windage loss. b.rotor output (–or+) friction and windage loss c.rotor output * friction and windage loss. d.rotor output + friction and windage loss.