Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
In which machine is the pulsation losses considerable?
Answer: bExplanation: The pulsation losses are aggravated if the length of air gap is small than the slot openings. The pulsation losses although are considerable in the induction motors.
Answer: b
See lessExplanation: The pulsation losses are aggravated if the length of air gap is small than
the slot openings. The pulsation losses although are considerable in the induction
motors.
The slotting produces harmonic fields which cause high frequency losses near the gap surface.
Answer: a Explanation: The pulsation losses are aggravated if the length of air gap is small than the slot openings. The slotting produces harmonic fields which cause high frequency losses near the gap surface.
Answer: a
See lessExplanation: The pulsation losses are aggravated if the length of air gap is small than
the slot openings. The slotting produces harmonic fields which cause high frequency
losses near the gap surface.
How are the pulsation losses aggravated?
Answer: a Explanation: The pulsation losses occurs in the pole faces and teeth. The pulsation losses are aggravated if the air gap is small compared with slot openings.
Answer: a
See lessExplanation: The pulsation losses occurs in the pole faces and teeth. The pulsation
losses are aggravated if the air gap is small compared with slot openings.
In which machine part/parts does the pulsation loss occurs?
Answer: d Explanation: The pulsation losses occurs in the teeth of the machine. The pulsation losses also occur in the pole faces.
Answer: d
See lessExplanation: The pulsation losses occurs in the teeth of the machine. The pulsation
losses also occur in the pole faces.
What is pulsation losses?
Answer: d Explanation: In the rotating electrical machine, the armatures are slotted and there is movement of rotor which leads to changes of local gap reluctance. This change leads to flux pulsations which causes additional losses called pulsating losses.
Answer: d
See lessExplanation: In the rotating electrical machine, the armatures are slotted and there is
movement of rotor which leads to changes of local gap reluctance. This change leads to flux pulsations which causes additional losses called pulsating losses.
What happens in the rotating electrical machine?
Answer: b Explanation: In the rotating electrical machine, the armatures are slotted and there is movement of rotor. Due to the movement of the rotor there are rapid changes of local gap reluctance.
Answer: b
See lessExplanation: In the rotating electrical machine, the armatures are slotted and there is
movement of rotor. Due to the movement of the rotor there are rapid changes of local
gap reluctance.
The leakage flux on the top of the slot is through iron, which is called ‘bridge’?
Answer: a Explanation: The leakage flux on the top of the slot is through iron, which is called ‘bridge’. Therefore the specific permeance of this path depends upon the permeance of iron which in turn depends upon the degree of saturation and hence upon the relative permeability of iron.
Answer: a
See lessExplanation: The leakage flux on the top of the slot is through iron, which is called
‘bridge’. Therefore the specific permeance of this path depends upon the permeance of
iron which in turn depends upon the degree of saturation and hence upon the relative
permeability of iron.
Which machine incorporates the usage of the closed slots?
Answer: c Explanation: The closed slots are being made use often in the small induction motors. The closed slots are used to increase the leakage reactance which in turn decreases the starting current.
Answer: c
See lessExplanation: The closed slots are being made use often in the small induction motors.
The closed slots are used to increase the leakage reactance which in turn decreases the
starting current.
What is the formula of the effective permeance of conductor portion?
Answer: b Explanation: The total flux linkages, total turns and total mmf is first calculated. On substitution the effective permeance of conductor portion is obtained.
Answer: b
See lessExplanation: The total flux linkages, total turns and total mmf is first calculated. On
substitution the effective permeance of conductor portion is obtained.
What is the formula of the permeance of the strip in the conductor portion?
Answer: c Explanation: The permeability in air, area of the flux path and the length of flux path is first calculated. On substitution, the permeance of the strip is obtained.
Answer: c
See lessExplanation: The permeability in air, area of the flux path and the length of flux path is first calculated. On substitution, the permeance of the strip is obtained.