Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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A 40 hp Squirrel cage Induction-type, 230 volts rated 3 phase motor. It has a code rating of "B" and an ambient temperature of 40 degree celcius. Conductor code RHW copper will be used. Determine its conductor size.
#10
Why stationary armature type alternator is widely used ?
Option 1:
2 slip rings used, more efficient cooling, less insulation
Option 2:
None of these.
Option 3:
3 slip rings, insulation cost is high,no winding damages
Option 4:
2 slip rings used, high insulation , no damages to windings.
Chapter 34 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 34 - Which NEC table is used to determine the full...Ch. 34 - A 5-HP single-phase motor is connected to 208...Ch. 34 - A 10-HP single-phase motor is connected to 240...Ch. 34 - A 75-HP synchronous motor is connected to a...Ch. 34 - A squirrel-cage induction motor has a nameplate...Ch. 34 - A squirrel-cage motor has a nameplate current...Ch. 34 - A 100-HP three-phase squirrel-cage induction motor...Ch. 34 - A 60-HP synchronous motor is connected to 240...Ch. 34 - Prob. 9RQCh. 34 - Both the motors and the feeder in Question 9 are...
Ch. 34 - A 30-HP squirrel-cage induction motor is connected...Ch. 34 - Refer to the preceding Practical Application. When...Ch. 34 - Refer to the first Practical Application in this...Ch. 34 - A 10-HP single-phase motor is connected to 240...Ch. 34 - A 500-HP synchronous motor is connected to 2300...Ch. 34 - A 30-HP three-phase squirrel-cage induction motor...Ch. 34 - A 75-HP synchronous motor is connected to a...Ch. 34 - Prob. 5PPCh. 34 - A 350-HP squirrel-cage induction motor is...Ch. 34 - Three squirrel-cage motors are connected to a...
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- A 460VAC rated, 60 Hz, 125-Hp Three-phase induction type motor is to be connected for across-the-line starting. The nameplate indicates the motor’s maximum ampere rating, 160A. It has a NEMA code letter B. The ambient temp of the installation place is and TW copper will be used. Short-circuit protection device that will be used is Inverse Time Breaker. Calculate the Conductor size.arrow_forwarda 500-hp synchronous motor is connected to 2300 volts. the motor is to operate at 90% power factor. what running current would be used to compute the conductor size and Fuze sizearrow_forwardAnswer Letter C only.arrow_forward
- Q2/ Design a 4-pole wave winding for an armature with 21 slots. Assume single turn coils and two conductors per slot. (35 mark)arrow_forwardQ/Two dc generators A and B has the following characteristics:GA: rated voltage=150 volt: rated carrent=30Ampere: armature resistance (0.4Ω).GB:no_lond voltage=160Volt: rated carrent=20Ampere: armature resistance=(0.6Ω).The generators are connected in paralled. Draw the circuit diagram, then find:no_load circulating current and no_load voltage?At what carrent the generator B will Be floating? The maximum possible land powerarrow_forwardPlease answer alll with brief explanationarrow_forward
- Question 2 (a) Figure Q2(a) shows the percentage differential relay used for the protection of an alternator winding. The relay has minimum pickup current of 0.15 A and a percentage slope of 12%. A high resistance ground fault occurs near the grounded neutral end of the generator winding with the current distribution as shown in Table Q2(a). Identify with reason whether the relay will operate. I I CB wiłu 400/5 400/5 iz mhu Figure Q2(a) Table Q2(a) Student Name I2 (A) ID (A) 370 300arrow_forward20.a. A capacitive sensor is used to detect the presence of _______ objects.A. ferrousB. nonmovingC. nonconductiveD. magnetic20.b. A three-phase motor can be made to run backwards byA. connecting a resistor in series with the armature.B. reversing the control voltage connections.C. reversing three of its power leads.D. reversing two of its power leads.arrow_forwardSix generators are operating in parallel supply a total current of 3500 A. Each machine has a field resistance of 60 ohms and an armature resistance of 0.01 ohm. The emfs generated of these generators are 250, 270 ,280, 290, 300, 310 volts respectively. Find the share of each of the generator.arrow_forward
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