Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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What are the options suits for a slip ring induction
motor?
(A) Slip ring induction motor has high starting
torque
(B) Slip ring Induction motor has a complicated
construction
(C) Slip ring induction motor has high efficciency
(D) Slip ring induction motor has more copper loss
O a. (A) and (B)
O b. (A), (B) and (C)
O c. (A) and (C)
O d. (A), (B) and (D)
Define the working of the Single phase induction motor with the properly labelled diagrams.
A freewheeling DC motor is driven with 1000 rpm and a nominal load torque of 80Nm. The field circuit resistance is 200 and the armature circuit resistance is 0.2 O. The field coils are fed with a zero degree transmission angle through a single-phase fully controlled converter connected to a single-phase 240V source. The armature circuit is fed from a single phase 400V source through another fully controlled converter. Magnetic saturation has been neglected, the motor constant is given as 0.8 V - s / A - rad. Assuming that there is no fluctuation in armature and field current, find the control angle of the converter feeding the armature at nominal load. If you want to leave the question blank, click again on the option you marked.
Chapter 34 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 34 - Which NEC table is used to determine the full...Ch. 34 - A 5-HP single-phase motor is connected to 208...Ch. 34 - A 10-HP single-phase motor is connected to 240...Ch. 34 - A 75-HP synchronous motor is connected to a...Ch. 34 - A squirrel-cage induction motor has a nameplate...Ch. 34 - A squirrel-cage motor has a nameplate current...Ch. 34 - A 100-HP three-phase squirrel-cage induction motor...Ch. 34 - A 60-HP synchronous motor is connected to 240...Ch. 34 - Prob. 9RQCh. 34 - Both the motors and the feeder in Question 9 are...
Ch. 34 - A 30-HP squirrel-cage induction motor is connected...Ch. 34 - Refer to the preceding Practical Application. When...Ch. 34 - Refer to the first Practical Application in this...Ch. 34 - A 10-HP single-phase motor is connected to 240...Ch. 34 - A 500-HP synchronous motor is connected to 2300...Ch. 34 - A 30-HP three-phase squirrel-cage induction motor...Ch. 34 - A 75-HP synchronous motor is connected to a...Ch. 34 - Prob. 5PPCh. 34 - A 350-HP squirrel-cage induction motor is...Ch. 34 - Three squirrel-cage motors are connected to a...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- An 8 pole, 50 Hz slip ring induction motor runs at a slip of 2.67% on full load. The rotor resistance per phase of the winding is 0.2 ohm. What external resistance per phase must be added in the rotor circuit so that the motor now runs ate a slip of 17.33% such that the torque remains same in both the cases. (Ans: 1.1 ohm)arrow_forwardQ5. Explain the difference for the following paragraphs, answer five only A. Auto transformers and Transfer rectifier units B. Stator and rotor frequenency C. Ram Air Turbine(RAT)and Axillary Power Unit (APU) D. Conventional and Auto transformers E. Synchronous speed and rotor speed of an induction motor F. primary and a secondary cell.arrow_forwardExplain the function of each three phase induction motor parts.arrow_forward
- a) Which components determine the excitation current of a transformer? How are they in transformer equivalent circuit modeled? b) Why is the polarity determination of a transformer made? Briefly explain how the experiment is done. c) If the direction of rotation of the motor changes when the feeding ends are changed in a DC motor, what can be said about its type? d) Why does the peak voltage increase as the serial DC generator is loaded? How long does this increase continue?arrow_forward9-In a the shunt field winding is connected in parallel with the armature winding only. Ish Series . Field EJR Shunt Rsh Rse Field 10-The consist of and 11- E = (V – IaRa ) then N = LOADarrow_forwardThe frequency of emf in the stator of a 4 pole, 3 phase induction motor is 50 Hz and that in the motor is 1.5 Hz. Determine (i) the slip and (ii) speed of the motor.arrow_forward
- 4- A double squirrel-cage induction motor has (a) Two series winding in stator (b) Two parallel windings in stator (c) Two parallel winding in rotor (d) Two rotors moving in opposite direction 5 The rotor slots are slightly skewed in squirrel cage induction motor to ---------- (a) Increase the strength of rotor bars (b) Reduce the magnetic hum and locking tendency of rotor (d) Provide ease of fabrication (c) Economize on the copper to be used 6- Stable operation of an induction motor is (a) Between zero slip and unity slip (b) Between zero slip and slip corresponding to maximum torque (e) Between 6.5 slip and 0.95 slip (d) Between slip corresponding to maximum torque and unity slip 7- Iron loss in the rotor of a 3-phase induction motor is negligible due to (a) Very low frequency of emf induced in the rotor (c) Very low flux density in rotor parts (b) Very low emf induced in the rotor (d) Constant magnitude of flux linking the rotor corearrow_forward6- In a stepper motor, how is the speed of rotation determined? a) By the current supplied to the motor. b) By the magnitude of the voltage applied. c) By the load applied to the motor. d) By the frequency of the waveforms used. 7- A transformer core is laminated to a) reduce hysteresis loss b) reduce eddy current losses c) reduce copper losses d) reduce all above losses 8- An induction motor with 580 r.p.m. speed at 60 Hz will have a) 8 poles b) 6 poles c) 4 poles d) 2 poles 9- If any two phases for an induction motor are interchanged a) the motor will run in reverse direction b) the motor will run at reduced speed c) the motor will not run d) the motor will burn 10- No-Load speed of which of the following motor will be highest? a) Shunt motor b) Series motor c) Short-Shunt compound motor d) Long-Shunt compound motorarrow_forwardc) What is the physical meaning for each of the following induction motor parameters: R1 „R2 ,Rc ,X1 ,X2 ,Xm ? What is synchronous watt?arrow_forward
- a) The rotor of a 3 phase, 60HZ, 4 pole induction motor takes 120 KW at 3 Hz. Determine: 1- The rotor speed. 2- The rotor copper losses.arrow_forward3. Describe the Volts per Hertz Control for three phase induction motor.arrow_forwardc) What is the physical meaning for each of the following induction motor parameters: R1 „R2 ,Rc ,X1 ,X2 ,Xm ?arrow_forward
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How Electric Motors Work - 3 phase AC induction motors ac motor; Author: The Engineering Mindset;https://www.youtube.com/watch?v=59HBoIXzX_c;License: Standard Youtube License