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प्रश्न
State change that you would make to convert an A.C. generator into a D.C. generator. Illustrate the change by a diagram.
उत्तर
As shown in the diagram the only change is that both the slip-rings of an A.C. generator are replaced by a split-ring (X-Y) (a ring split in two halves) which acts as a commutator or current-reverser.
A. C. Generator
D. C. Generator
The other parts in both are the same. By this device the current in the external circuit becomes unidirectional.
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संबंधित प्रश्न
A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each______.
The essential difference between an AC generator and a DC generator is that
Complete the following sentence:
A generator with commutator produces ............... current.
Each one of the following changes will increase emf (or voltage) in a simple generator except:
(a) increasing the number of turns in the armature coil
(b) winding the coil on a soft iron armature
(c) increasing the size of the gap in which the armature turns
(d) increasing the speed of rotation
An electric generator converts:
(a) electrical energy into mechanical energy.
(b) mechanical energy into heat energy.
(c) electrical energy into chemical energy.
(d) mechanical energy into electrical energy.
Draw a labelled diagram of a simple a.c. generator.
Explain the construction and working of the following. Draw a neat diagram and label it.
Electric Generator (AC)
Observe the figure and answer the following questions.
a) Identify the machine shown in figure.
b) Write a use of this machine.
c) How transformation of energy takes place in this machine.
State true or false:
The frequency of AC is 50 Hz.
A coil of insulated copper wire is connected to a galvanometer forming a loop and a magnet is:
A: Held stationary
B: Moved away along its axis
C: Moved towards along its axis
D: There will be an induced current in
