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What is the formula for the cooling co-efficient to the rotating field coils?
Answer: cExplanation: The armature voltage is first calculated for the calculation of the cooling coefficient of rotating field coils. The cooling coefficient is used to calculate the temperature rise.
Answer: c
See lessExplanation: The armature voltage is first calculated for the calculation of the cooling
coefficient of rotating field coils. The cooling coefficient is used to calculate the
temperature rise.
What is the formula of the dissipating surface of the coil?
Answer: c Explanation: First the length of the mean turns of the coil is calculated. Then the winding height and the diameter of the winding is calculated to obtain the dissipating surface of the coil.
Answer: c
Explanation: First the length of the mean turns of the coil is calculated. Then the winding height and the diameter of the winding is calculated to obtain the dissipating surface of the coil.
See lessWhat is the formula of the resistance of the winding is calculated at 75°C?
Answer: a Explanation: The number of field turns is calculated along with the pole proportion. The length of mean turns of the coil and the area of the field conductors is calculated and on substituting the values the resistance of the winding is obtained.
Answer: a
Explanation: The number of field turns is calculated along with the pole proportion. The length of mean turns of the coil and the area of the field conductors is calculated and on substituting the values the resistance of the winding is obtained.
See lessWhat is the relation between winding space and the depth?
Answer: b Explanation: The winding space is indirectly proportional to the depth. If the winding space is less, then the depth is increased.
Answer: b
Explanation: The winding space is indirectly proportional to the depth. If the winding space is less, then the depth is increased.
See lessWhat is the formula for the number of field turns of the field windings?
Answer: b Explanation: The field mmf per pole at full load is calculated from the voltage across each field coil. Next, the field current is calculated and from these values the number of field turns is calculated.
Answer: b
Explanation: The field mmf per pole at full load is calculated from the voltage across each field coil. Next, the field current is calculated and from these values the number of field turns is calculated.
See lessWhat is the formula for the field current of the synchronous machines?
Answer: a Explanation: For the calculation of the field current, first the current density is calculated. Next, the area of conductors is calculated and the field current is calculated.
Answer: a
See lessExplanation: For the calculation of the field current, first the current density is calculated. Next, the area of conductors is calculated and the field current is calculated.
What is the range of the current density in the field conductors?
Answer: b Explanation: The minimum range of the current density in the field conductors is 3 A per mm2 . The maximum value of the current density in the field conductors is 4 A per mm2 .
Answer: b
Explanation: The minimum range of the current density in the field conductors is 3 A per mm2 . The maximum value of the current density in the field conductors is 4 A per mm2 .
See lessWhat is the formula for the voltage across each field coil?
Answer: a Explanation: The field current is first calculated from the machine. Next the resistance value of each field at 75°C is calculated and this gives the voltage across each field coil.
Answer: a
See lessExplanation: The field current is first calculated from the machine. Next the resistance value of each field at 75°C is calculated and this gives the voltage across each field coil.
What is the winding depth for the pole pitch of 0.1 mm?
Answer: a Explanation: The winding depth is 25 mm for the pole pitch of 0.1 mm. The winding depth is 35 mm for the pole pitch of 0.2 mm. The winding depth is 45 mm for the pole pitch is 0.3 mm.
Answer: a
Explanation: The winding depth is 25 mm for the pole pitch of 0.1 mm. The winding depth is 35 mm for the pole pitch of 0.2 mm. The winding depth is 45 mm for the pole pitch is 0.3 mm.
See lessWhat is the approximate value of the space taken by spools, flanges, etc?
Answer: d Explanation: The value of the space taken by spools, flanges are required for the calculation of the winding height. The approximate value of the space taken by spools, flanges, etc. is 20 mm.
Answer: d
Explanation: The value of the space taken by spools, flanges are required for the calculation of the winding height. The approximate value of the space taken by spools, flanges, etc. is 20 mm.
See less