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GATE 2022: Electrical Machines - 56
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In Scott connection, if the turns ratio of primary to secondary of main transformer is K, then the teaser transformer has the transformation ratio of
Which of the following statement is true for a DC machine. (Here ϕ is flux per pole)
A 2500/ 250V, 25 kVA, transformer is connected as an auto transformer to 2500/2750 V. Its rating would be:
A. 250 kV
A transformer has iron loss of 90 W at 60 Hz supply and 52 W at 40 Hz supply. Both losses being measured at same peak flux density. The total iron loss in the transformer at 50 Hz supply will be:
A 4 pole, 3-phase, 50 Hz, induction machine has rotor resistance and reactance of 0.02 and 1.2 Ω respectively at standstill. If the slip at maximum torque is 0.1.What will be the percentage improvement in power factor after addition of external resistance?
The figure shows plots of speed (N) Vs. armature current (Ia) of a dc motor for two different operating conditions. Which one of the following features is relevant?
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Jun 25ESE & GATE EE
Chetan GoyalMember since Mar 2021AIR 1805, GATE2021