25kW, 120V separately excited dc machine has an armature resistance of  Ra =0.025 ohms. When operated with a constant field current and constant speed of 2500rpm, the open circuit armature voltage is 120V. If the dc machine is connected to a 125V supply, determine                                             (i)Whether the dc machine is operating as a generator or a motor.                   (ii)The armature current     (iii)The supply power   (iv)The developed power.     (v)The developed torque.

Q: The machine has a resistance of 0.25 ohm and is connected ulate the e.m.f. Generated when it runs as…

A: Resistance (R) = 0.25 ohm Voltage (V) = 300 V Ia = 100 A Ia = 80 A We have to calculate the e.m.f.…

Q: A long compound DC generator feeding a load of current 100 A, at a voltage of 230 V. Calculate the…

A: Given: Current, IL=100A, Resistance, Ra=0.04ΩRsh=115ΩRse=0.01Ω Voltage, V=230V

Q: A series motor runs at 700 rev/min when the voltage is 300 V and the current is 20 A. The armature…

A: Initial speed of motor N1=700 rpm. Initial terminal voltage V1=300 V. Armature current Ia=20 A.…

Q: A DC generator feeds a load of current 20 A and voltage 220 V. Calculate the electrical motive force…

A: Load current IL= 20 A Load Voltage VL = 220 V Resistance of armature Ra= 0.02 Resistance of field…

Q: 2. Assume negligible inductance for the motor model shown in Figure 1. This motor is connected to a…

A:

Q: series motor runs at (800 r.p.m) when the voltage is (400 V A). The armature resistance is (0.4 Q)…

A:

Q: Ashunt-wound DC motor with the feld coils and rotor connected in parallel (Figure 1) operates from a…

A: From the DC shunt motor equivalent circuit

Q: A 220 V DC series motor runs drawing a current of 30 A from the supply. Armature and field circuit…

A: It is given that:

Q: A 250 V series motor has an armature resistance of 0.2 ohm and a series-field resistance of 0.18…

A:

Q: A 220 V separately excited dc motor takes 20 A and the armature resistance is 1.0 0. If the armature…

A: We need to find out the speed for given motor.

Q: The armature of a d.c. machine has a resistance of 0.25 ohm and is connected to a 300V supply.…

A: As per the question, it is given that Resistance = 0.25 ohm Voltage = 300 V We have to calculate the…

Q: A 300V DC motor is running at 1600rpm taking a current of 40A. The armature reisistance is 0.5Ω. Due…

A: Given data: Supply voltage, V=300 V Sheet of motor, N=1600 rpm Armature current, Ia=40 A Armature…

Q: A long compound DC generator feeding a load of current 100 A, at a voltage of 230 V. Calculate the…

A:

Motor Load, Torque, and Power Quality Requirement

An electric motor is a gadget that changes electrical energy into mechanical energy over to follow up on a mechanical burden. The weight set on the motor because of this mechanical movement is known as motor load. Appropriately matching the motor burden to the engine is vital to forestall harm to the engine or wasteful and unnecessary expensive activity. Engines perform such undertakings as moving a thing starting with one spot then onto the next, cutting it, changing its shape, etc. The motors might be evaluated as far as a few variables including power yield, voltage, current, and temperature. Harm to an engine might happen when it is worked under over the top engine load contrasted with its appraised limit.