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What factor does the rotor body depends upon in the construction of hydro-generators?
Answer: c Explanation: In the hydro-generators the salient poles are attached to the rotor body. The type of rotor body used depends in general on the peripheral speed.
Answer: c
Explanation: In the hydro-generators the salient poles are attached to the rotor body. The type of rotor body used depends in general on the peripheral speed.
See lessHow many steel brackets are used along with the support to steel rings?
Answer: c Explanation: During the process of bracing one or two circular steel rings are used to support the overhang. Along with the steel rings 4-6 steel brackets are also used.
Answer: c
See lessExplanation: During the process of bracing one or two circular steel rings are used to
support the overhang. Along with the steel rings 4-6 steel brackets are also used.
What should be done to the conductors in the overhang of the stator?
Answer: a Explanation: The conductors in the overhang of the stator must be braced. Bracing is the process of raising the mechanical strength of the conductors.
Answer: a
See lessExplanation: The conductors in the overhang of the stator must be braced. Bracing is the process of raising the mechanical strength of the conductors.
What happens to the electromagnetic forces during the sudden short circuits at the line terminals?
Answer: a Explanation: The electromagnetic forces are directly proportional to the square of the current. It increases by 250 times the force under normal full load conditions.
Answer: a
Explanation: The electromagnetic forces are directly proportional to the square of the current. It increases by 250 times the force under normal full load conditions.
See lessWhat happens to the current in the windings during the sudden short circuits at the line terminals?
Answer: b Explanation: The current in the windings during short circuit at the line terminals increases to about 15 times the full load current. It can also increase to higher level depending on the direct axis sub-transient reactance.
Answer: b
Explanation: The current in the windings during short circuit at the line terminals increases to about 15 times the full load current. It can also increase to higher level depending on the direct axis sub-transient reactance.
See lessWhat is the main advantage of a winding with multi-turns coils?
Answer: b Explanation: The main advantage of a winding with multi-turns coils is that it allows a greater flexibility in selecting the value of stator slots. It in turn helps in choosing the required number of turns per phase.
Answer: b
Explanation: The main advantage of a winding with multi-turns coils is that it allows a greater flexibility in selecting the value of stator slots. It in turn helps in choosing the required number of turns per phase.
See lessThe capacity of the pull out machines used for making the coils limits the pole pitch to less than 0.8 m.
Answer: a Explanation: The capacity of the pull out machines used for making the coils limits the pole pitch to less than 0.8 m. The capacity of the pull out machines used for making coils limits the length of slot portion to about 3 m.
Answer: a
See lessExplanation: The capacity of the pull out machines used for making the coils limits the pole pitch to less than 0.8 m. The capacity of the pull out machines used for making coils limits the length of slot portion to about 3 m.
What among the following is the advantages of the star connection?
Answer: c Explanation: The hydro-generators stator windings are connected in the star connected with the neutral earthed. It eliminates the triple frequency harmonics from the line voltage.
Answer: c
See lessExplanation: The hydro-generators stator windings are connected in the star connected with the neutral earthed. It eliminates the triple frequency harmonics from the line voltage.
How are the stator windings of all synchronous generator connected?
Answer: c Explanation: The stator windings of all the synchronous generator are connected in the star connection with neutral earthing. The main advantage that the winding has to be insulated to earth for the phase voltage and not the line voltage.
Answer: c
Explanation: The stator windings of all the synchronous generator are connected in the star connection with neutral earthing. The main advantage that the winding has to be insulated to earth for the phase voltage and not the line voltage.
See lessWhat is the range of the outside diameter of the stator frame of the large hydro-generator?
Answer: c Explanation: The minimum value for the outside diameter of the stator frame of the large hydro-generators is 3.5 m. The maximum value for the outside diameter of the stator frame of the large hydro-generators is 18 m.
Answer: c
Explanation: The minimum value for the outside diameter of the stator frame of the large hydro-generators is 3.5 m. The maximum value for the outside diameter of the stator frame of the large hydro-generators is 18 m.
See less