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What is the meaning of stiffness?
d Explanation: The diameter of shaft for an electrical machine is determined by considerations of stiffness. The stiffness is the ability to withstand the weight of rotor and unbalanced magnetic pull.
d
See lessExplanation: The diameter of shaft for an electrical machine is determined by
considerations of stiffness. The stiffness is the ability to withstand the weight of rotor and
unbalanced magnetic pull.
What is the consideration for the determination of the diameter of shaft?
c Explanation: The main aspect for the design of the diameter of the shaft is the stiffness. The diameter of the shaft depends on the stiffness of the machine
c
See lessExplanation: The main aspect for the design of the diameter of the shaft is the stiffness.
The diameter of the shaft depends on the stiffness of the machine
How many factors are present in the behavior of transformer under short circuit conditions?
b Explanation: There are 3 factors present in the behavior of the transformer under short circuit conditions. They are temperature rise, current density, mechanical forces
b
See lessExplanation: There are 3 factors present in the behavior of the transformer under short
circuit conditions. They are temperature rise, current density, mechanical forces
What is the dimension of the round copper wire made use of in the windings of current transformer?
b Explanation: Copper strip is used for primary windings. The dimension of the round copper wire made use of in the windings of current transformer is 3 mm2
b
See lessExplanation: Copper strip is used for primary windings. The dimension of the round
copper wire made use of in the windings of current transformer is 3 mm2
What is the best number of secondary turns of the current transformer?
c Explanation: The best number of secondary turns of the current transformer is 1 or 2 less than the number such that the turns ratio is equal to the nominal current ratio. For example in a 1000/5 current transformer, the secondary turns number would be 198 or 199 rather than 200
c
See lessExplanation: The best number of secondary turns of the current transformer is 1 or 2
less than the number such that the turns ratio is equal to the nominal current ratio. For
example in a 1000/5 current transformer, the secondary turns number would be 198 or
199 rather than 200
What happens if the number of secondary turns is reduced?
d Explanation: The reduction of the number of secondary turns reduces the transformation ratio. If the number of secondary turns reduces by 1 percent the actual transformation ratio reduces by equal percentage
d
See lessExplanation: The reduction of the number of secondary turns reduces the transformation
ratio. If the number of secondary turns reduces by 1 percent the actual transformation
ratio reduces by equal percentage
What is the formula of the actual ratio?
c Explanation: The turns ratio is first calculated. Next the load current and secondary current is calculated and on substitution gives the actual ratio.
c
See lessExplanation: The turns ratio is first calculated. Next the load current and secondary
current is calculated and on substitution gives the actual ratio.
What is the use of the turns compensation in current transformer?
b Explanation: There are 2 types of errors in the current transformer. The turns compensation is used to reduce the ratio error
b
See lessExplanation: There are 2 types of errors in the current transformer. The turns
compensation is used to reduce the ratio error
What is the rating of the primary current in the current transformer?
d Explanation: The rating of the primary current is minimum 500 A. If the rating is less than 500 A, then multiturn primary windings and rating is above than 500 A, then single turn winding is enough
d
See lessExplanation: The rating of the primary current is minimum 500 A. If the rating is less than
500 A, then multiturn primary windings and rating is above than 500 A, then single turn
winding is enough
What is the ideal condition with respect to the primary current rating?
d Explanation: The primary current rating depends on exciting mmf and primary mmf. The ratio of the exciting mmf to the primary mmf should be low
d
See lessExplanation: The primary current rating depends on exciting mmf and primary mmf. The
ratio of the exciting mmf to the primary mmf should be low