Q) Answer by true or false 1- The critical speed in a DC shunt generator is the speed of the DC…

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Q) Answer by true or false 1- The critical speed in a DC shunt generator is the speed of the DC generator at which shunt field resistance is represents the critical field resistance. 2- The external characteristic of DC shunt generator is the relation between the terminal voltage and field circuit current. 3- In case of failure to build-up voltage in a DC shunt generator, the reason for that may be the resistance of load circuit is less than the critical resistance? 4– The internal characteristics of DC shunt generator are the relation between the e.m.f. actually induced in the armature and

Q) Answer by true or false 1- The critical speed in a DC shunt generator is the speed of the DC generator at which shunt field resistance is represents the critical field resistance. 2- The external characteristic of DC shunt generator is the relation between the terminal voltage and field circuit current. 3- In case of failure to build-up voltage in a DC shunt generator, the reason for that may be the resistance of load circuit is less than the critical resistance? 4– The internal characteristics of DC shunt generator are the relation between the e.m.f. actually induced in the armature and the armature current. 5– In speed control of dc shunt motor, the armature voltage drop has the great effect on speed change. 6– As the load is increased gradually, the load current increases but the terminal voltage decreases due to the increase in voltage drop of armature circuit resistance and the armature reaction. 7– In speed control of dc shunt motor, if the armature voltage decreased to the half value, the speed increases to twice the rated value. 8- – In speed control of dc shunt motor, the speed can be changed by separating the field winding. 9- – In order to build-up an e.m.f in a DC shunt generator, the field winding must be connected is such a way that field produced by it is not exceed the residual magnetism. 10 – – The field coils of a DC shunt generator are wound with a large number of turns of non-isolated fine wire. 11- – The open circuit characteristics of DC shunt generator are the relation between the no-load generated e.m.f. in the armature and the armature current. 12 — In speed control of dc shunt motor, the speed is inversely proportional to the armature voltage. 13 – – In speed control of dc shunt motor, changing the direction of connection of the field winding, double the speed value. 14 – – The magnetic flux in a DC shunt generator can be established by the field coils excited by some external source. 15– At no-load, the voltage across the terminal of DC shunt generator is maximum and considered equal the generated e.m.f.

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