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Electrical Machines
Which of the following motors are suitable for computer printer drive ?
Reluctance motor.
Shaded pole motor.
Hysteresis motor.
Stepper motor.
Reluctance motor.
Shaded pole motor.
Hysteresis motor.
Stepper motor.
Answer
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Related Question
Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of
0o.
Greater than 90o.
90o.
less than 90o.
0o.
Greater than 90o.
90o.
less than 90o.
Answer
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Electrical Machines
In a synchronous generator with constant steam input supplies power to an infinite bus at a lagging power factor. If the excitation is increased
both power angle and power factor decrease
power angle decrease and power factor increase
both power angle and power factor increase
power angle increase and power factor decrease
both power angle and power factor decrease
power angle decrease and power factor increase
both power angle and power factor increase
power angle increase and power factor decrease
Answer
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Electrical Machines
In a 3 - ÃŽÂ¦ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by
E1 / E2 = f1kw1 / f2kw2.
E1 / E2 = 1.
E1 / E2 = N1kw1 / N2kw2.
E1 / E2 = N1 / N2.
E1 / E2 = f1kw1 / f2kw2.
E1 / E2 = 1.
E1 / E2 = N1kw1 / N2kw2.
E1 / E2 = N1 / N2.
Answer
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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.
0.443.
0.649.
0.573.
0.512.
0.443.
0.649.
0.573.
0.512.
Answer
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Electrical Machines
which of the following type of brush and their application is/are correct
carbon brush → normal ratings
copper graphite → low voltage high current density
All of these
electro graphite → large ratings
carbon brush → normal ratings
copper graphite → low voltage high current density
All of these
electro graphite → large ratings
Answer
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