A DC motor is initially at rest and is then connected to a 12V battery. The motor has aresistance of 2 Ohms and an inductance of 0.5 Henrys. The motor has a torque constant of0.1 Nm/A and a back EMF constant of 0.1 V/(rad/s). Determine the current through themotor as a function of time, and the time it takes for the motor to reach 90% of its finalsteady-state speed.

Q: hotors a) What power is developed by a motor that turns at 1200 rpm and has a torque of 3.0 N-m?

A: Referring to question, the given information are: Speed of motor (s)=1200rpm. Torque (Ts)=3.0N-m.

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: induction motor is rated 5 HP, 75% power factor and 220 V. What approximate size of capacitor (VAR)…

A: We need to find out VAR size for increased power factor

Q: 8. Find the counter-EMF voltage of a permanent magnet DC motor when it runs at 2080 rpm. The…

A: The solution is given below

Q: (a) What is the resistance of a 220-V AC short circuit that generates a peak power of 96.8 kW? (b)…

A:

Q: The DC shunt generator with the terminal voltage 350 V, armature drop 9 V and the each brush drop 4…

A: We need to tell about generated voltage for generator.

Q: 78 The induced emf of a dc machine running at 750 rpm is 220 V. The percentage increase in field…

A: we need to determine percentage increase in the field flux.

Q: Can you explain the given questions in an original way? Factors Affecting Electrical Energy in DC…

A: Electrical machines can be either generator, transformers, or motors. They can be either Ac machines…

Q: . What are the various losses in an induction motor? On what factors do they depend

A: The fallowing are the various losses that occur in an induction motor:

Q: Stationary part in a DC machine is called A5 a) rotor b) commutator c) stator d) none of these

A: In this question we will write about stationary part in a DC machine....

Q: A Series Motor has an Armature Resistance of 0.2 and a Series Field Resistance of 0.3 ohm. It is…

A: Need to find back EMF of motor

Q: The slots per pole of a dc machine having 10 poles, 30 slots, duplex, wave winding will be O 3 1 2 4

A: In this question,  We need to choose the correct options What is slot per pole of a DC machine.  If…

Q: block diagram fro dc motor refrigerator

A: Electrical machines can be either generator, transformer or motors. They can be either Ac machines…

Q: 1.78 The induced emf of a dc machine running at 750 rpm is 220 V. The percentage increase in field…

A: we need to find out percentage change in flux.

Q: Electrical Engineering University of Technology-Irag 2 year. Math. 4 Example: Use complex form, find…

A: To solve easily some prerequisites are provided, follow them.

Q: active elements/conductors

A:

Q: If two 3-phase induction machines are mechanically coupled with each other. The two machines are…

A: The induction motors are coupled here mechanically. The speed will same for both machines because of…

Q: Find out the primary current and consider the 1:1 turns ratio.

A: Calculation of the primary current and consider the 1:1 turns ratio.

Q: What is the difference between wound rotor induction machines and squirrel cage machines

A: The wound rotor (also called as slip ring) and squirrel cage machines are the type of rotor in…

Q: .A 230 V dc series motor has Ra=0.22, Rf=0.12. The motor draw 40A at rated speed and 1000 RPM. Find…

A:

Q: When the field current (If) is increased towards its rated value in the DC shunt generator, the…

A: Given, DC shunt generator, If, field current is increased

Q: Q10. The rotating machine of Figure Q10 has the following parameters: Lss = 0.18 H, L = 0.06 H, and…

A: Given Source A=2.5 A (DC) Source B =8.5 A(rms), 50 Hz   peak values are Source A=2.5 A Source B=8.52…

Q: 1. Explain electric are discharge V-A characteristic in DC and AC modes.

A: The DC and AC Forms of Arc welding are to basically used to for welding applications which require…

Q: ----- In d.c. generators armature reaction is produced by armature current O none of the mentioned O…

A:

Q: At no load, a 250V shunt motor runs at 1000 rpm and draws 8A. Armature and field resistances are…

A:

Q: A long shunt compound generator supplies 29 A at 420 V. If the field resistance is 246 Q, the series…

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: Q4 (a) DC machines are generators that convert mechanical energy to DC electric energy and motors…

A:

Q: The torque developed by a dc series motor is 32 N-m when drawing 17 A. If the current is doubled,…

A:

Q: The figure below depicts the winding of an electric motor. It has a resistance of R = 15.3 and an…

A: The objective of this question is to find the current flowing through the winding of an electric…

Q: Machine has 6 pole pairs and it is supplied with 50 Hz frequency. In order to double rated…

A: In this question, we need to determine the numbers of poles. We know, Speed N= 120f/P

Q: current through the armature of a motor changes from +3.0-A to - 3.0-A in 0.0030 s. A 104- V induced…

A: We need to find out the inductance for given Change in current

Q: Steam enters an adiabatic turbine at 6 MPa and 550 °C and leaves at 10 kPa and 50 °C. If the…

A: Let, T0=0°C=273 K it is given that at P1 =6 MPa; T1=550°C hence  h1 = 3540 kJ/kg              s1 =…

Q: The DC shunt generator with the terminal voltage 300 V, armature drop 7 V and the each brush drop 4…

A: In this we will find emf..

Q: A short shunt compound generator supplies a load current of 100 A at 250 V. The generator has the…

A: