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: 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: 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: 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 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: Please answer all subparts please answer in typing format

A: Step 1: Step 2: Step 3: Step 4:

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: 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.