Electrical Machines Maximum allowable moisture content of power transformer insulating oil is generally taken as 45 ppm. 25 ppm. 20 ppm. 35 ppm. 45 ppm. 25 ppm. 20 ppm. 35 ppm. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be 59.2%. 88.8%. 57.1%. 48.0%. 59.2%. 88.8%. 57.1%. 48.0%. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The speed of a DC series motor is Inversely proportional to the armature current. Proportional to field current. Proportional to the square of the armature current. Proportional to the armature current. Inversely proportional to the armature current. Proportional to field current. Proportional to the square of the armature current. Proportional to the armature current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What type of dielectric material is used in capacitors used for fans and for power factor correction? Mica. Oil impregnated paper. Glass. Vacuum. Mica. Oil impregnated paper. Glass. Vacuum. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ? 240 V. 150 V. 230 V. 210 V 240 V. 150 V. 230 V. 210 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is: 50 Hz. Zero Hz. 25 Hz. 100 Hz. 50 Hz. Zero Hz. 25 Hz. 100 Hz. ANSWER DOWNLOAD EXAMIANS APP
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