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What are the disadvantages of the low rated secondary current transformer?
d Explanation: When there is a low secondary current rating in the current transformers they produces high voltages if the secondary is left open. It is also costly to produce the windings because of the extra time involved in the making.
d
See lessExplanation: When there is a low secondary current rating in the current transformers
they produces high voltages if the secondary is left open. It is also costly to produce the
windings because of the extra time involved in the making.
What is the value of the rated secondary current?
d Explanation: The rating of the secondary current is the maximum current that can be passed through the secondary windings. It is 5 A for the current transformer.
d
See lessExplanation: The rating of the secondary current is the maximum current that can be
passed through the secondary windings. It is 5 A for the current transformer.
What should the magnetic path be in order to reduce the core reluctance?
a Explanation: The length of the magnetic path in core should be as small as possible. This reduces the core reluctance of the current transformer
a
See lessExplanation: The length of the magnetic path in core should be as small as possible.
This reduces the core reluctance of the current transformer
What type of core is employed when the performance standard required is not so high?
c Explanation: Ring core type is used only for the high performance operation. The rectangular strips or c-shaped sections are used when the standard of performance required is not so high
c
See lessExplanation: Ring core type is used only for the high performance operation. The
rectangular strips or c-shaped sections are used when the standard of performance
required is not so high
What is the relation of the secondary winding leakage reactance and secondary circuit impedance?
a Explanation: The secondary winding leakage reactance is directly proportional to the secondary circuit impedance. In secondary winding the leakage reactance is reduced and in turn the secondary circuit impedance is reduced.
a
See lessExplanation: The secondary winding leakage reactance is directly proportional to the
secondary circuit impedance. In secondary winding the leakage reactance is reduced
and in turn the secondary circuit impedance is reduced.
What is the material used in the transformer when the transformer errors should be small?
a Explanation: The mumetal cores are commonly used when it is essential that transformer errors shall be small. Mumetal has the properties of high permeability, low loss and small retentivity.
a
See lessExplanation: The mumetal cores are commonly used when it is essential that
transformer errors shall be small. Mumetal has the properties of high permeability, low
loss and small retentivity.
How many classifications are the magnetic alloys used in the current transformers classified into?
a Explanation: The magnetic alloys used in the current transformers are divided into 3 types. They are hot rolled silicon steel, cold rolled grain oriented silicon steel and nickel iron alloys
a
See lessExplanation: The magnetic alloys used in the current transformers are divided into 3
types. They are hot rolled silicon steel, cold rolled grain oriented silicon steel and nickel
iron alloys
What should be done in order to reduce the errors in the core?
c Explanation: The errors in the core are reduced by keeping the exciting mmf low. This can take place with the core having a low reluctance and low iron loss.
c
See lessExplanation: The errors in the core are reduced by keeping the exciting mmf low. This
can take place with the core having a low reluctance and low iron loss.
How many design principles are present in the current transformers?
d Explanation: There are 5 design principles present in the current transformers. They are core design, secondary current rating, primary current rating, windings and behavior of the transformer under short circuit current
d
See lessExplanation: There are 5 design principles present in the current transformers. They are
core design, secondary current rating, primary current rating, windings and behavior of
the transformer under short circuit current
How is the reluctance of the interleaved corner related with the magnetizing current?
a Explanation: The reluctance of the interleaved corner is directly proportional to the magnetizing current. As the reluctance is being reduced it in turn reduces the magnetizing current
a
See lessExplanation: The reluctance of the interleaved corner is directly proportional to the
magnetizing current. As the reluctance is being reduced it in turn reduces the
magnetizing current