Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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the magnetic strengh of the field poles on a perment magnet DC motor cannot be varied
a- true
b- false
A 6 pole generator has a flux of 12 mWb per pole. The
armature has a total of 900 conductors and is driven at
1500 rpm. Find the emf generated if the armature is (1)
lap wound and (2) wave wound.
1.Two identical shunt generators running in parallel, each with armature resistance of 0.02 ohms and
field resistance of 50 ohms. The combined load current is 5000A. The field are so excited that the
generated voltages of one machine is 610V and the other is 600V. The terminal voltage of this parallel
combination will be.
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Ish1
Rh1
a.350-360 V
b.450-460 V
c. 550-560V
Rat
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G₂
Raz
5000 A
Ish2
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- 1- The compole is used to 2- A 4-pole wave winding machine has ------ magnetic circuit. 3- A commutator pitch for the duplex wave winding is equal to - 4- A 2-pole triplex lap winding will have parallel paths. 5- A 6-pole lap wound generator has 900 conductors. The e.mf induced per one turn being 3V. the generated voltage of the grnerator is ( 6-A 10kW, 250 V shunt generator has armature and field resistance of 0.2 and 502 respectively. Then the generated voltage is andarrow_forwardT-a. The direction of rotation of a single-phase split-phase motor can be change by........ a) reversing the connection of the start winding b) reversing the connection of the run winding c) reversing the connection of the start and run winding at the same time d) "a" or "b", not "c" T-b. Single-phase split-phase motors using an electrolytic capacitor in the start winding circuit should not be cycled more than about__________ time per hour. a) 8 b) 12 c) 24 d) none of the above T-c. When replacing the capacitor in a capacitor-start induction-run motor, one must be sure to replace the bad capacitor with__________ . a) a smaller one b) one of the same size c) a larger one d) none of the abovearrow_forwardHere it is the equivalent circuit of and induction motor and it is per phase circuit my question is name for me the variable for example R1 is the winding resistance and so an the all variable and please show me a pic of the real machine with the variable for example for R1 happens because of the winding i need to see the winding in the real machine, please help me to understand wellarrow_forward
- at stand still the impedance of the inner and outer cages of induction motor are zi= 0.02+j2 zo = 0.2+j1 perphase value at what slip will the torques contributed by tow cages be equalarrow_forward4- An induction Motor is a) Self-starting with high torque c) Self-starting with low torque 5- In three-phase squirrel-cage induction motors a) Rotor conductors are kept open b) Rotor conductor ends are short-circuited through slip rings c) Rotor conductors are short-circuited through end rings d) Rotor conductors are connected to insulation b) Self-starting with zero torque d) Not self-startingarrow_forwardA 4 pole generator with wave wound armature has 54 slots each having 20 conductors. The flux per pole is 0.01 Wb. ) At what speed must the armature rotate to give an induced EMF of 225V is, (11) What will be the voltage developed, if the winding is lap connected and the armature rotates at the same speed is, searcharrow_forward
- In dc machines, armature windings are placed on the rotor because of the necessity for Electromechanical energy conversion Generation of voltage Commutation O Development of torquearrow_forward2) the armature windings of a 12-pole DC machine are composed of 72 coils with 10 windings, and the windings are 5the layered wave is yellowish. The Rotor speed is 1000 rpm and the flux value per pole is 25mWb.Resistance of Armature windings, commutation windings and compensation windings is 70mΩ, 10mΩ and5mω. (a) the number of current paths in the machine, (b) the total number of conductors in Armature windings, (c) armature coefficient (constant)arrow_forwardWhat is the relationship between slip s) and load (Pa) in an induction motor? Please explain.arrow_forward
- A 6 pole generator with wave wound armature has 50 slots each having 24 conductors. The flux per pole is 0.01 Wb. (i) At what speed must the armatur rotate to give an induced EMF of 230V is, (ii) What will be the voltage developed, if the winding is lap connected and the armature rotates at the same speed is?arrow_forwardIf residual magnetism of a shunt generator is destroyed due to any reason, it may be restored by connecting its shunt field * to an AC source to a DC source to neutral to earth The direction of electro-magnetic torque developed in the armature of a DC machine can be reversed by reversing the direction of * rotation armature current either field flux or armature current. field fluxarrow_forwardA 2 pole wave wound dc generator has 44 slots, each slot having 20 conductors. The flux/pole is 0.018 weber. At what speed the armature be rotated to get an induced emf of 220 V. What will be the induced emf developed if the armature winding is lap connected and runs at the same speed. Speed Generated Emf when lap connectedarrow_forward
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