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Electrical Machines
Swinburne's test is applicable to
DC shunt and level Compound motor.
DC Shunt motor.
DC compound motor.
DC series motor.
DC shunt and level Compound motor.
DC Shunt motor.
DC compound motor.
DC series motor.
Answer
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Related Question
Electrical Machines
No load primary current in a transformer
lags behind applied voltage somewhat less than 90Ã
leads the applied voltage by exactly 90Â&
lags behind applied voltage by exactly 90Â&am
leads the applied voltage somewhat less than 90Ã&
lags behind applied voltage somewhat less than 90Ã
leads the applied voltage by exactly 90Â&
lags behind applied voltage by exactly 90Â&am
leads the applied voltage somewhat less than 90Ã&
Answer
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Electrical Machines
Voltage regulation of transformer is given by
(V2 - E2) / V2
(E2 - V2) / E2
(V2 - E2) / E2
(E2 - V2) / V2
(V2 - E2) / V2
(E2 - V2) / E2
(V2 - E2) / E2
(E2 - V2) / V2
Answer
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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be
6% and -4%
4.8% and -3.2%
None of these
3.2% and -1.6%
6% and -4%
4.8% and -3.2%
None of these
3.2% and -1.6%
Answer
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Electrical Machines
Slip test is performed to determine
All of these
slip
direct axis reactance and quadrature axis reactance
positive sequence reactance and negative sequence reactance
All of these
slip
direct axis reactance and quadrature axis reactance
positive sequence reactance and negative sequence reactance
Answer
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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then
Ia increases and ωm decreses
Ia remains constant but ωm increase
both armature current Ia and speed ωm increase
both decrese
Ia increases and ωm decreses
Ia remains constant but ωm increase
both armature current Ia and speed ωm increase
both decrese
Answer
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