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Electrical Machines
Slot wedges in a dc machine is made up of
cast iron.
mild steel.
silicon steel.
fibre.
cast iron.
mild steel.
silicon steel.
fibre.
Answer
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Related Question
Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series
76.91 V.
86.91 V.
56.91 V.
66.91 V.
76.91 V.
86.91 V.
56.91 V.
66.91 V.
Answer
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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?
1130 r.p.m.
1037.5 r.p.m.
none of above.
4575.4 r.p.m.
1130 r.p.m.
1037.5 r.p.m.
none of above.
4575.4 r.p.m.
Answer
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Electrical Machines
The introduction of interpoles in between the main poles improves the performance of a dc machine, because
the inequality of air-gap flux on the top and bottom halves of the armature is removed
the interpoles produce additional flux to augment the developed torque
the flux waveform is improved with reduction in harmonics
a counter-emf is induced in the coil undergoing commutation
the inequality of air-gap flux on the top and bottom halves of the armature is removed
the interpoles produce additional flux to augment the developed torque
the flux waveform is improved with reduction in harmonics
a counter-emf is induced in the coil undergoing commutation
Answer
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Electrical Machines
In DC machines shape of net flux density is?
peaky in nature
flat tapped or trapezoidal
sine wave
saddle shape
peaky in nature
flat tapped or trapezoidal
sine wave
saddle shape
Answer
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Electrical Machines
The core flux in transformer depends mainly on
supply voltage and frequency
supply voltage, frequency and load
supply voltage
supply voltage and load
supply voltage and frequency
supply voltage, frequency and load
supply voltage
supply voltage and load
Answer
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