A single-phase transformer is to be switched to the supply to have minimum inrush current. The switch should be closed at

In case of an armature controlled separately excited dc motor drive with closed loop speed control, an inner current loop is useful because it

The hysteresis loop of a magnetic material has an area of 5 cm² with the scales given as 1 cm = 2 AT and 1 cm = 50 mWb. At 50 Hz, the total hysteresis loss is

An electric motor with 'constant output power' will have a torque speed characteristic in the form of a