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What is the relationship between the diameter and number of poles?
Answer: a Explanation: The number of poles is one of the factors involved in the separation of D and L in the synchronous machines. The number of poles is directly proportional to the diameter.
Answer: a
See lessExplanation: The number of poles is one of the factors involved in the separation of D
and L in the synchronous machines. The number of poles is directly proportional to the diameter.
What is the range of the pole length to pole pitch ratio for obtaining good power factor in induction motors?
Answer: c Explanation: The range of the pole length to pole pitch ratio should be between 1.0-1.25 for the good power factor. The range of the pole length to pole pitch ratio should be between 1.5-2 for minimum cost.
Answer: c
See lessExplanation: The range of the pole length to pole pitch ratio should be between 1.0-1.25 for the good power factor. The range of the pole length to pole pitch ratio should be between 1.5-2 for minimum cost.
What is the maximum value of the peripheral speed that should not exceed?
Answer: c Explanation: The peripheral speed of the machine should not exceed 30 m per sec. If it exceeds it leads to the damage of the windings. The banding wires on the overhang have to be made so strong if the peripheral speed exceeds 30 m per sec.
Answer: c
Explanation: The peripheral speed of the machine should not exceed 30 m per sec. If it exceeds it leads to the damage of the windings. The banding wires on the overhang have to be made so strong if the peripheral speed exceeds 30 m per sec.
See lessWhat is the range of the ratio of the pole length to pole pitch?
Answer: b Explanation: The minimum value of the ratio of the pole length to pole pitch is 0.64. The maximum value of the ratio of the pole length to pole pitch is 0.72.
Answer: b
See lessExplanation: The minimum value of the ratio of the pole length to pole pitch is 0.64. The maximum value of the ratio of the pole length to pole pitch is 0.72.
What is the formula of the core length?
Answer: b Explanation: Core length is one of the factors used in the separation of D and L of the DC machines. It is the ratio of the pole length to the pole pitch.
Answer: b
See lessExplanation: Core length is one of the factors used in the separation of D and L of the
DC machines. It is the ratio of the pole length to the pole pitch.
The fractional horsepower motors have efficiency of order of 98%.
Answer: b Explanation: The fractional horse power motors have efficiency of order of 60% or less.The large turbo-alternators have efficiency of order of 98% because efficiency increases with an increase in dimensions
Answer: b
See lessExplanation: The fractional horse power motors have efficiency of order of 60% or less.The large turbo-alternators have efficiency of order of 98% because efficiency increases with an increase in dimensions
What is the formula of the efficiency of the machine?
Answer: a Explanation: The output is first calculated from the running of the machine and the different losses are calculated. On substitution the efficiency of the machine is calculated.
Answer: a
See lessExplanation: The output is first calculated from the running of the machine and the
different losses are calculated. On substitution the efficiency of the machine is
calculated.
What is the formula of the I2R loss?
Answer: d Explanation: The number of conductors and copper loss in each conductor is first calculated. On substitution the I2R loss is obtained.
Answer: d
See lessExplanation: The number of conductors and copper loss in each conductor is first
calculated. On substitution the I2R loss is obtained.
What is the relation of the specific electric loading and the diameter?
Answer: b Explanation: The specific electric loading is one of the factors under the relation between rating and dimension of rotating machines. The specific electric loading is indirectly proportional to the diameter.
Answer: b
See lessExplanation: The specific electric loading is one of the factors under the relation between rating and dimension of rotating machines. The specific electric loading is indirectly proportional to the diameter.
What is the relation between output and the specific electric loading?
Answer: a Explanation: The choice of specific electric loading is one of the factors under the relation between rating and dimensions of rotating machines. The specific electric loading is directly proportional to the output.
Answer: a
See lessExplanation: The choice of specific electric loading is one of the factors under the
relation between rating and dimensions of rotating machines. The specific electric
loading is directly proportional to the output.