A shunt wound de motor has an armature resistance of 2.52 and a shunt field resistance of 1602. The terminal voltage is 120 volts and the line current is 8 Amperes. Back emf is developed in the armature when the motor is running considering only the copper loss. Calculate the efficiency of the motor.

A shunt wound de motor has an armature resistance of 2.52 and a shunt field resistance of 1602. The terminal voltage is 120 volts and the line current is 8 Amperes. Back emf is developed in the armature when the motor is running considering only the copper loss. Calculate the efficiency of the motor.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter5: Resistors

Section: Chapter Questions

Problem 1PA

See similar textbooks

Related questions

Q: A 250V series motor draws a current of 40A. The armature resistance is 0.15 ohm and the field…

Q: Given: A 200VDC shunt motor carries 12A, the armature resistance = 0.750. Calculate the following:…

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

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

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

Q: A 240-volt series motor has an armature resistance of 0.42 ohm and a series-field resistance of 0.18…

A: In tbe question A 240-volt series motor has an armature resistance of 0.42 ohm and a series-field…

Q: A 120 V shunt motor has an armature equivalent of 0.5 ohm and a field resistance of 60 ohm. At full…

A: Given data, Armature resistance Ra=0.5 Ω Field resistance Rf=60 Ω Terminal voltage V = 120 V Load…

Q: A 4-pole, d.c. shunt motor has a flux per pole of 0.04 Wb and the armature is lap-wound with 720…

A: We will find generated emf in armature using general equations than we will find spped from emf…

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

Q: A 220-volt DC series motor is running at a speed of 800 r.p.m and draws 100 A. Total resistance of…

Q: A shunt DC motor is supplied by 520V terminals voltage and is used to supply a mechanical load with…

A: The solution can be achieved as follows.

Q: A 4 pole lap wound dc machine has 728 active conductors running at 1800 rpm. The flux per pole is…

Q: A 250 V dc shunt motor has an armature resistance of 0.2 Ω and a field resistance of 100 Ω. When…

A: No load current 5 AB.R.D = 1 V per brushIL = 50 ARsh = 100 ΩIsh=250100Ish= 2.5 AIa0 = 2.5 A IaL =…

Concept explainers

Gear Motor

A gear motor is a combination of a gearbox and an electric motor. This combination of two systems is used for efficient usage of the motor. It makes a cost-effective solution for high torque, low-speed applications. These motors are used in our household as, garage door openers, alarm clocks. In commercial areas, hospital beds, cranes.

Question

A shunt wound de motor has an armature resistance of 2.52 and a shunt field resistance
of 1602. The terminal voltage is 120 volts and the line current is 8 Amperes. Back emf
is developed in the armature when the motor is running considering only the copper loss.
Calculate the efficiency of the motor.
a. 76.937%
b. 80.937%
c. 84.896%
d. 90.625%

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps with 1 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.

Similar questions

A series motor runs at 800 rev/min when the voltage is 400V and the current is 25A. The armature resistance is 0.4 ohm and the series field resistance is 0.2 ohm. Determine the resistance to be connected in series to reduce the speed to 600 rev/min with the same current.
Colve asap
A series motor runs at 700 rev/min when the voltage is 300 V and the current is 20 A. The armature resistance is 0.3 2 and the series field resistance is 0.1 2. Determine the resistance to be connected in series to reduce the speed to 500 rev/min with the same current
A 220 V DC series motor runs drawing a current of 30 A from the supply. Armature and field circuit resistances are 0.4 and 0.1 respectively. The load torque varies as the square of the speed. The flux in the motor may be taken as being proportional to the armature current. To reduce the speed of the motor by 50% the resistance in ohms that should be added in series with the armature is
2. A 4 pole dc shunt motor has a flux per pole of 0.04 Wb and the armature is lap wound with 720 conductors. The shunt field resistance is 240 ohms and the armature resistance is 0.2 ohm. Brush contact drop is 1V per brush .Determine the speed of the machine when running as a motor taking 60 A and as a generator supplying 120A.The terminal voltage is 480V in each case.
A shunt DC motor is supplied by 520V terminals voltage and is used to supply a mechanical load with rotating speed of 1000rpm. The armature is wave-wound and has 500 conductors. The useful flux per pole is 0.03Wb and there are 4 poles (2 pairs of poles). The armature resistance is 0.4 Ohms. Calculate: 1.The internal emf of the motor. 2.The armature current. CLEAR AND CORRECT OR DISLIKE
A 120 V shunt generator running at 850 rpm has its armature and shunt field resistance of 0.15 ohm and 50 ohm respectively. It supplies 200 lamps each rated at 60 W, 100 V. The friction and windage and core loss of the machine is 400 W. its armature copper * loss on full load and shunt field loss is 2156.7 W, 240 W 2232.6 W, 240 W O 2232.6 W, 200 W 2156.7 W, 200 W O
A 250V series motor draws a current of 40A. The armature resistance is 0.15 ohm and the field resistance is 0.05 ohm. Determine the maximum efficiency of the motor.
I:01)
Answer please in 10 minutes
A 4-pole, d.c. shunt motor has a flux per pole of 0.04 Wb and the armature is lap-wound with 720 conductors. The shunt field resistance is 240 Q and the armature resistance is 0.2 S. Brush contact drop is 1V per brush. Determine the speed of the machine when running (a) as a motor taking 60 A and (b) as a generator supplying 120 A. The terminal voltage in each case is 480 V.
A 250 V series motor has an armature resistance of 0.2 ohm and a series-fieldresistance of 0.18 ohm. If the speed is 6oo RPM when the current is 32 amps.What will be the motor speed when the load is reduced so that the current is18 amps, under which condition the percent flux change is 50 % of the percentcurrent change.