Electric Motors and Control Systems
2nd Edition
ISBN: 9780073373812
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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PLEASE ANSWER #4 ONLY. USE THIS ID# AS A BASIS
A=4
B=8
C=4
D=7
E=2
F=2
In a three phase-four wire star connected system, the three outer wires are called as lines and the
common wire in centre is called as
The diagram shows a brass rod and an iron rod beside each other at the bottom of a
rectangular coil. What happens when a d.c. current passes through the coil?
to d.c.
supply
rectangular
coil
brass
iron
rod
rod
Only the brass rod is magnetized
Only the iron rod is magnetized
The two rods attract each óther
The two rods repel each other.
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- How many lines of magnetic flux must be cut in 1 s to induce a voltage of 1 V?arrow_forwardRefer to the transformer shown in Figure 5-13 to answer the following questions. What is the turns ratio of the winding between points B and E as compared to the winding between points D and E? Figure 5-13 Autotransformer practice problems.arrow_forwardin a dc machine 72 number of coils are used. Find the number of commutator ?segments required 74 72 37 36arrow_forward
- Power-consuming devices are wired in _____(series orparallel).arrow_forwardDefine the following terms: Flux density Permeability Reluctance Saturation Coercive force Residual magnetismarrow_forwardThree inductors are connected in parallel. Inductor 1 has an inductance of 0.06 H; inductor 2 has an inductance of 0.05 H; and inductor 3 has an inductance of 0.1 H. What is the total inductance of this circuit?arrow_forward
- Refer to the circuit shown in Figure 5-29. In this circuit, the HR contactor is equipped with five contacts. Three are load contacts and two are auxiliary contacts. From looking at the schematic diagram, how is it possible to identify which contacts are the load contacts and which are the auxiliary contacts? Figure 5-29 The contactor contains both load and auxiliary contacts.arrow_forwardIf a single-phase load is connected across the two line conductors and neutral of the transformer in question #2, and one line has a current of 80 amps and the other line has a current of 68 amps, how much current is flowing in the neutral conductor?arrow_forwardHow can the polarity of an electromagnet be determined if the direction of current flow is known?arrow_forward
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