4.a. The stop control in a three-wire control scheme stops the motor by A. increasing the resistance in the run circuit. B. shorting the starter coil. C. tripping the thermal overloads. D. disrupting current flow to the coil. 4.b. An across-the-line starter does not change the speed of a squirrel-cage motor because it A. varies the internal rotor resistance. B. does not vary the line voltage. C. varies the line voltage as the line frequency increases. D. varies the pole connections at each setting.

Q: 6- The injected e.m.f in the rotor of induction motor must have (a) The same frequency as the slip…

A: The explanation is as follows.

Q: Q4. What do you mean by circle diagram of a 3-phase induction motor? Answer the following: (i) (ii)…

A: Circle diagram -  By adjusting the slip of an induction motor, the total efficiency may be achieved.…

Q: 1.a. The large current that a DC motor will draw on start-up is called A. inrush current. B.…

A:

Q: 1-D.C. shunt motor maintains a more constant speed under varying load. (True or False) 2-Dc shunt…

A: 1-D.C. shunt motor maintains a more constant speed under varying load.    2-Dc shunt motor is best…

Q: Why the rotor conductors of the squirrel cage rotor are short-circuited and in the case of slip-ring…

A:

Q: A DC compound motor has shunt field resistance of 5002 and series field resistance of 22. Shunt…

A: Shunt field resistance of the motor (Rsh) = 500 Ω Series field resistance (Rse) = 2 Ω Shunt field…

Q: 1. Explain the difference between a slip ring and a squirrel -cage motor.

A: WOUND ROTOR (SLIP RING):- The rotor windings is uniformly distributed and is usually connected in…

Q: The parameters of the exact equivalent circuit for a three-phase, A- connected, 400-V, 10-hp, 50-Hz,…

A: We are authorized to answer one question at a time, since you have not mentioned which question you…

Q: b) Draw the speed control block diagram of the DC motor, which can be controlled with armature…

A: Ac speed control motors- Constructio motor- the construction of the single phase and three-phase…

Q: 14. Under line voltage control of induction motor the speed regulation occurs: a) by change of the…

A: We need to select correct answer for given statement .

Q: Select which of the following winding of Synchronous motor requires AC power supply. O a.…

A: Choose the correct option The winding of synchronous motor require ac power supply ?

Q: -. Calculate the speed of the motor when it draws 25 A rom the source.

A:

Q: 1. The rotor is separated from the stator by a small air gap that range from depending on the power…

A: In this question,  Choose the correct option 1. What is range of air gap between stator and rotor in…

Q: 17.A. The arrangement which can NOT be used to control the speed of a universal motor operating from…

A: Here we discuss about the universal motor & a 1phase ac motor.

Q: Q2) A small three phase induction motor has a short-circuit equal to 5 times the full load current.…

A: Step 1: Circuit diagram of resistance starting:Step 2: In starter resistance starting, reduced…

Q: The field windings is kept on --in BLDC motor

A:

Q: A three-phase, six-pole, 60 Hz, 230-volt wound rotor motor has its stator connected in delta and its…

A: Given Estator =230 volts.                                 Fstator=60Hz Nrotor=0.8 *Nstator.…

Q: A 3-phase induction motor has a 4-pole, star-connected stato supply. The rotor resistance is 0-1…

A:

Q: What are the different methods for Soft starting of three phase induction motor. Present an…

A: soft starting three phase induction motor- a soft starter provide  reduced voltage to stator winding…

Q: The effect of connecting a 50-Hz motor to a 60-Hz circuit and increasing the motor voltage by 6/5…

A: Ans)  A. output power will increase  Reason: Let us assume voltage input for 50 Hz case is 'V' , the…

Q: _________induction motor is an AC motor that provides variable speed control by varying the…

A: Which induction motor is an AC motor that provides variable speed control by varying the resistance…

Q: 21. A) At what percentage of slip is the pull-out or breakdown torque of a typical 3-phase…

A: Three phase induction motor is single excited system which is electrical analogy with secondary…

Q: 22.a. The maximum torque produced by a split-phase motor is also called the A. full-load torque. B.…

A:

Q: 2- A simple wave wound de shunt motor has the following data: Armature resistance =0.1 ohm Shunt…

A: Given data: Ra=0.1 Ω Rsh=100 Ω P=2 Z=400 Vs=400 V N=3000 rpm Is=104 A Wave winding, A = 2…

Q: Please answer all subparts please answer in typing format

A: Step 1: Step 2: Step 3: Step 4:

Q: The 3-phase, 8-pole (2p = 8), 50 Hz, asynchronous motor operates at 740 rpm and draws 80 kW from the…

A:

Q: 9. The power input to the rotor of a 3-phase, 50 Hz, 6 pole induction motor is 80 kW. The rotor…

A:

Q: A switched reluctance motor has salient poles on ..................... a. neither stator or rotor b.…

A: Option B: A switched reluctance motor has salient poles on both the stator and the rotor A Switched…

Q: The frequency of the supply to the stator of a 4-pole induction motor is 60 Hz and the rotor…

A: Speed is calculated as given below

Q: A 6-pole, 230-V, 50-Hz, Y-connected, 3-phase induction motor has the following per- phase…

A: Given P=6 VL= 230 V N=950 rpm s= slip f =50 Hz

Q: Why Hysteresis Losses of DC motor is constant? O a. It depends on load O b. none of the above O c.…

A: The explanation is as follows.

Q: (B)- Indicate whether the following statements are true or false and correct the false statements…

A: In this question we will write speed control of dc shunt motor , core loss component of motor…

Q: 53. A 200 W, 230 V, 50 Hz capacitor-start mo- tor has the following winding parameters: Main…

A: Given a 200 W, 230 V, 50 Hz capacitor start motor has, Main winding parameter: R=4.5 Ω, XL=3.7 Ω.

Q: How are a PSC motor and a capacitor-start-capacitor-run motor similar? Select one: A. BOTH USE A…

A: Permanent Split capacitor and capacitor start capacitor run motor make use of a running capacitor.…

Q: How does the starting torque responsible in the use of the starter for the 3 phase induction motor

A: In the 3 phase induction motor, the value of the armature resistance is kept minimum to avoid the…

Q: A 6-pole, 230-V, 60-Hz, Y-connected, three-phase induction motor has R1=0.50, R2'=0.250, X1=0.759,…

A:

Q: Overhauling is a condition in which the motor’s armature rotates                           (…

A: The explanation is as follows.

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.