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.
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.
Please help me with these MCQ
1. stator windings are connected in _____ types
2. Circuit resistance is checked by connecting a(n) ______ to the positive battery terminal and the output, or battery terminal of the AC regenerator.
3. Slip rings and brushes
A: Mount on the rotor shaft
B: Conduct current to the rotor field coils
C: Are insulated from each other and the rotor shaft
D: All of the above
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_forwarda)Please explain the connection methods of Current and Voltage Transformers? b) Control the DC motor speed and direction. Draw the circuit.arrow_forward
- Q/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_forwardAssuming that the listed exception doesn't apply, the NEC states that the minimum number of overloadunit(s) required for a three-phase, alternating current motor shall be A. three. B. two. C. one. D. four.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
- a 500-up 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 fuse size.arrow_forwardQuestion 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_forward
- Draw the developed diagram of the stator winding of a 3-phase machine with 24-slot and 4-pole. The winding is of lap type and with 1. Single layer 2. Double layer-full pitch winding 3. Double layer - the winding is short pitched by one slot. (Draw coils of phase B)arrow_forward460VAC squirrel cage, 60 hp, 3 phase induction-type AC motor, is to be controlled with 220VAC rated magnetic contactor. Control circuit will be supplied with 110VAC. What is the full-load current and the conductor size.arrow_forwardIdentify the DC Generator used for Arc welding purpose. With a neat sketch explain its working. list its advantages & disadvantages??arrow_forward
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