In practice, while performing O.C. test on transformer input voltage applied to__________ winding, while performing S.C.test input voltage applied to________________winding.
In a single phase, full wave bridge circuit and in three phase, delta full wave bridge circuit, the ripple voltage frequency is always
A 3φ, Induction Motor had T_{max} as 300 Nm with a supply of 440 V, 50 Hz. If the supply is changed to 220 V, 25 Hz new T_{max} is
The operating range of slip of an induction machine when it is operating in generating mode
In a capacitor start induction motor the power factor of main winding is 0.866 lag. The power factor of auxiliary winding should be
A 4 pole dynamo with wave wound armature has 51 slots containing 20 conductors in each slots. The induced emf is 357 volts and the speed is 8500rpm. The flux per pole will be
A 4 pole short shunt wave wound compound generator supplies 25 kW at terminal voltage of 500 V. The armature resistance is 0.1 Q, series field resistance is 0.15 Q and shunt field resistance is 126.875 Q. The emfgenerated is____________
A 230 V d.c. series motor develops its rated output at 1500 rpm while taking 20 A. Armature and series field resistance are 0.6 Q and 0.4 Q respectively. To obtain rated torque at 1000 rpm, external resistance mustbe added is____________
A shut Machine Connected to 250 V supply has an armatureresistance of 0.12 Ω and field resistance of 100 Ω. Then the ratio of the speed of machine as a generator to the machine as a motor, if the line current is 80A in both cases is____________
A 3φ, 50 Hz, 400 V, induction motor with 10 poles, running at speed of 540 rpm. If the number of poles reduced to 8, the newoperating slip is____________
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