If the flux of the DC motor is decreases then the Line current increases Supply voltgae increases Speed increases Flux decreases

Q: If the DC machine is held constant at 3000 rpm. The DC voltage is 250V. If the field is held…

A: DC machine have speed N=3000 RPM DC voltage 250V  For constant field with 250V, is it machine?

Q: T or F, modify the wrong part if False, please underline twice your answer if True or False.…

A: In this question we will write relation between field flux and current in dc series motor....

Q: 8. At what speed (r/min) will an eight-pole, 50 Hz, 240 V ac motor run?

A:

Q: 10. With an increase of the current density of the stator winding * the stator winding electric…

A: In this question we will write effect of increasing current density of stator winding....

Q: What part does the frequency of alternating current play in the operation of an electric motor?

A:

Q: A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

A: In this we have to find out speed of shunt generator if  flux reduce by half..

Q: A shunt generator delivers 45 Amperes of current to a load at 220 volts at an efficiency of 86%. The…

A: From given input power and efficiency calculate armature resistance and shunt field winding losses.…

Q: Show that a 1% change in flux is approximately equivalent to a change of 0.01 in magnitude.

A: The solution is given below

Q: 1-1. If a generator is producing 125 V, what will its voltage be if (a) The flux is increased 20%.…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: In DC motor, if speed decreases then the Supply voltgae increases O Flux increases Flux decreases O…

A: Choose the correct option In DC motor, if speed decrease then?

Q: Explain different the neat sketch of speed torque profiles. a. 0< Slip1

A: Need to draw speed vs torque curve of induction motor

Q: Question 9 Find the reluctance of a magnetic circuit if a magnetic flux = 4.2 × 10-¹Wb is…

A:

Q: The voltage across the terminals of a generator field is 220 volts, and the field current is 4…

A: In this question we need to find the resistance of the field circuit.

Q: Calculate the electric flux for each of the closed surfaces a, b, c, and d. b. 92 97 95 94 96

A:

Q: A mechanical load of 0.5n moved by a 12 v linear motor with movable member of 0.2 meter long moving…

A: i) For the steady-state condition, the force on the mechanical load should be balanced. The force…

Q: The following questions refer to to a 6-pole DC generator has a simplex lap-wound armature…

A:

Q: What is power input of motor.

A: Given motor diagram is -

Q: A D.C. shunt motoro is a 200 V D.C. supply- Conneded to resistance of 0.2r and at 450 revmin.…

A: In the dc shunt motor Find the change in the flux and torque if the armature current and speed…

Q: A 220 V DC series motor is running at a speed of 800 rpm and draws 100 A. Calculate at what speed…

A: Given data, The value of voltage is V = 220 V. The value of speed is N1 = 800 rpm. The value of…

Q: "If the field lines is in parallel with n hat, the the electric flux is equal to___."     EA…

A:

Q: choose the correct answer In single phase energy meter , ______________  magnet is placed at the…

A: In single phase energy meter, we have to use one magnet which controls speed of disc.

Q: A dc generator is driven at a speed of 1000 rpm and generates 120 volts. Determine the generated emf…

A:

Q: 3) A In which of the following application DC series motor is used: A. Centrifugal Pump B. Motor…

A:

Q: A 120 V motor draws 12 A when running at 3200 RPM. When the motor armature is momentarily stopped…

A: We need to find out the resistance of armature.

Q: A motor runs at 900 r/min off a 460 V supply. Calculate the approximate speed when the machine is…

A: E1 =460V  N1 900rpm   E2 = 200V   N2?  Flux2=0.7*flux1

Q: Problem 22. A motor runs at 900 r/min off a 460 V supply. Calculate the approximate speed when the…

A: Given:- Speed of motor 900 rpm 460 V Supply Assume new flux to be 0.7 of original flux. If ϕ is the…

Q: Speed increases

A:

Q: Question: A 4 Pole DC Generator Is Wounded Lap. It Rotates At 50Orpm To Be Able... A 4 pole DC…

A:

Q: In a 4 pole lap wound DC Machine has 720 conductors, the number of parallel paths is on Windows bui…

A: - There are two types of winding configuration in DC Machine namely; Lap wound and wave wound. Given…

Q: Question 2: A motor runs at 900 rpm off a 460 V supply. Calculate the approximate speed when the…

A:

Q: In DC motor, if the back emf increases then the O Speed decreases Supply voltgae increases OLine…

A: From the EMF equation of DC motor, Eb=PϕZN60A Where, Eb is back emf P is the number of poles N is…

Q: The power transmitted by the shaft of the motor is 20HP. If the torque is 222N-m, what is the speed?

A: Given: Power transmitted by shaft, P=20 Hp Torque, T=222 Nm

Q: A four pole, 1200 rpm DC lap wound generator has 1520 conductors. If the flux per poles is 0.01 Wb.…

A: Given: DC lap wound generator having P=4N=1200Z=1520ϕ=0.01 Wb

Q: To produce mechanical power using dc motor the following condition (s) must be satisfied Current…

A: DC motor is an electrical machine that converts electrical energy into mechanical energy.

Q: and other loads which consume a current of 15 A. Calculatethe power output of the generator under…

A:

Q: Q4-) A dc generator rotate at 300 r/min. The stator is designed for 6 pole. Total produced magnetic…

A: Given that  N=300 rpmP=6 Total flux=0.18 Wb Although formula for induced emf is given by…

Q: 3. Determine and evaluate the motor electrical time constant Te. This is done by assuming that the…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: in a dc machine 72 number of coils are used. Find the number of commutator ?segments required 72 O…

A: Given: A DC machine in which number of coil = 72 We need to determine the number of commutator…

Q: 6. Calculate the flux in a 4-pole dynamo with 722 armature conductors generating 500 V when running…

A: As per our company guidelines we are supposed to answer only first question kindly repost other…

Q: The diagrams show three generators. Which are alternating current Generators? coil rotation soft…

A: According to the question we have discuss about the generating nature of the given generator…

Q: 1. The air gap between stator and rotor is about...mm

A: 3-Phase Induction motor- When a three-phase stator displaced by 120 degrees (in space of 120…

Q: A 45 kW, 131 V DC shunt generator has an armature and field resistance of 0.04 ohms and 65 ohms…

A: Load current = power delivered to load / load voltage                         = 45000/131…

Q: A. The brushes used in a DC generator a) ride against the commutator segments. b) are made from…

A: commutator in the DC generator converts  AC current into pulsating DC &amp; hence it assures that…

Q: pole in the electric motor (electromagnet) if it loses its magnetic field How to recharge the

A: A magnet is used to create the magnetic field. it may be an electromagnet or a permanent magnet,…

Q: A 100V series motor runs at 400rpm when taking a current of 55A. Ra = 0.02 ohm, Rf = 0.03 ohm. What…

A: The solution is given below.

Q: fong flux density is 50,000 lines/in.2 and the current is 6 A. 8. What is the effect on the…

A: In this question we will find force on conductor and emf of dc motor...

Q: If the supply frequency of a certain electro-magnetic structure is doubled while the applied voltage…

A: The solution is given below

Q: A coil has 480 turns and flux in it changes from 0.24 mWb to 1.2mWb in 0.24 seconds. Calculate the…

A: When the flux changes through the coil, a emf is induced in the coil.

Q: QUESTION 7 A universal motor operates using either AC or DC neither AC nor DC DC only O AC only

A:

Q: A 120 V motor draws 12 A when running at 3200 RPM. When the motor armature is momentarily stopped…

A: Given: V=120 VIa=12 AN=3200 rpmWhen armature stopped, Ia'=30 A

Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.