Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 1, Problem 1.2P
A flywheel with a moment of inertia of
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A DC motor armature draws 150 A while generating a magnetic flux of 0.02 Wb. The armature constant is K = 1 V
min/Wb. What is most nearly the motor's developed torque?
28.65 n-m
50.3 n-m
O 4,73 n-m
O 11.70 n-m
QUESTION 6
A DC motor armature draws 150 A while generating a magnetic flux of 0.02 Wb. The armature constant is K = 1 V
min/Wb. What is most nearly the motor's developed torque?
28.65 n-m
50.3 n-m
4,73 n-m
O 11.70 n-m
If there is a current of 2 A flowing counterclockwise in the coil (as seen from
the +z direction) what is the magnitude of the torque on the loop due to the
above magnetic field? Enter a description of your calculations and your final
answer in the text box (just as if it were a HW assignment)
BIU - I E B
Chapter 1 Solutions
Electric machinery fundamentals
Ch. 1 - What is torque? What role does torque play in the...Ch. 1 - What is Amperes law?Ch. 1 - What is magnetizing intensity? What is magnetic...Ch. 1 - How does the magnetic circuit concept aid in the...Ch. 1 - What is reluctance?Ch. 1 - What is a ferromagnetic material? Why is the...Ch. 1 - How does the relative permeability of a...Ch. 1 - Prob. 1.8QCh. 1 - What are eddy current losses? What can be done to...Ch. 1 - Why are all cores exposed to ac flux variations...
Ch. 1 - What is Faraday law?Ch. 1 - What conditions are necessary for a magnetic field...Ch. 1 - What conditions are necessary for a magnetic field...Ch. 1 - Prob. 1.14QCh. 1 - The linear machine in Figure 1-19 is running at...Ch. 1 - Just how does a decrease in flux produce an...Ch. 1 - Will current be leading or lagging voltage in an...Ch. 1 - What are real, reactive, and apparent power? What...Ch. 1 - What is power factor?Ch. 1 - Prob. 1.1PCh. 1 - A flywheel with a moment of inertia of 4kgm2 is...Ch. 1 - A force of 10 N is applied to a cylinder of radius...Ch. 1 - A motor is supplying 50Nm of torque to its load....Ch. 1 - A ferromagnetic core is shown in Figure P1-2. The...Ch. 1 - A ferromagnetic core with a relative permeability...Ch. 1 - A two-legged core is shown in Figure P1-4. The...Ch. 1 - A core with three legs is shown in Figure P1-5....Ch. 1 - A two-legged core is shown in Figure P1-4. The...Ch. 1 - A wire is shown in Figure P1-7 that is moving in...Ch. 1 - Repeat Problem 1-10 for the wire in Figure P1-8.Ch. 1 - Prob. 1.12PCh. 1 - A core with three legs is shown in Figure P1-10....Ch. 1 - A two-legged magnetic core with an air gap is...Ch. 1 - A transformer core with an effective mean path...Ch. 1 - The core shown in Figure P1-2 has the flux shown...Ch. 1 - Prob. 1.17PCh. 1 - Prob. 1.18PCh. 1 - Prob. 1.19PCh. 1 - Demonstrate that Equation (1-59) can be derived...Ch. 1 - Prob. 1.21PCh. 1 - Prob. 1.22PCh. 1 - For the linear machine of Problem 1-22: When this...
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- If a self-excited generator has lost all magnetism, can it build up an output voltage? Explain. of its residual Does a generator slowly lose its residual magnetism with time? How would you get a generator to work after it had lost all its residual magnetism?arrow_forwardQ1) A flywheel with a moment of inertia of 6 kg.m? is initially at rest. If a torque of 8 N.m (counterclockwise) is suddenly applied to the flywheel, what will be the speed of the flywheel after 4 s? Express that speed in both radians per second and revolutions per minute.arrow_forwardThe induced emf in a dc machine when running at 500 rpm is 180 v. calculate he induced emf while the machine is running at 600 rpm by assuming flux to be constantarrow_forward
- Probl The rectangular coil in the figure below is in a field B = 0.01a,T. a. Find the torque about the z axis when the coil is in the position shown and carries a current of 10 A b. Find the torque if the coil turns through 90°7 0.2m & 0.2m 1-10Aarrow_forwardQ1) In a two-stimulus magnetic system, the inductance relationships are as follows L11 = L22 = 2H , L12 = L21 = cosOH Two coils are connected in parallel to the voltage V=500sin314t. What is the average torque of the system per 0=30°?arrow_forwarda. Does the slip increase as the load increases? What is the reason of this? b. What does it mean if the shift is 0, 1, -1, how is it achieved? Explain.arrow_forward
- What should be the net electromagnetic torque developed if the rotating electrical machine has different number of poles on its stator and rotor.arrow_forwardA four pole machines generates 250V when operated at 1500 rpm. If the flux per pole is 1.85 x 106 maxwell, the number of armature slots is 45 and the armature winding has two parallel paths. If the speed of the generator is reduced to 1350 rpm, what would be the generated voltage. To what value of flux per pole should the excitation be adjusted if the generated voltage is to remain the same at 250Varrow_forwardQ1) In a two-stimulus magnetic system, the inductance relationships are as follows L11 = L22 = 2H , L12 = L21 = coseH Two coils are connected in parallel to the voltage V=500sin314t. What is the average torque of the system per 0=30°?arrow_forward
- A simple generator has a square armature 9.0 cm on a side. The armature has 80 turns of 0.59-mm-diameter copper wire and rotates in a 0.700-T magnetic field. The generator is used to power a lightbulb rated at 12.0 V and 25.0 W. Part A At what rate should the generator rotate to provide 12.0 V to the bulb? Consider the resistance of the wire on the armature. Express your answer to two significant figures and include the appropriate units. HA ? f = Value Unitsarrow_forwardDetermine the magnetic flux (per pole) in a 100-V, 780 watts, PM motor operating at a speed of 1500 rpm. The motor constant is 88, the armature resistance is 0.7 Ω, and the rotational losses are (50) Warrow_forwardno more than 50 words. How would you reverse the polarity of a self-excited DC generator?arrow_forward
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