The power factor of the following circuit will be the unity A) Inductance B) Capacitance C) Resistance D) None of these
In D.C. machines the __ in field mmf results in an increase in the size and cost of machines A) Increase B) Decrease C) Both D) None of the above
For a motor-generator set which of the following motors will be preferred A) Synchronous motor B) Slip ring induction motor C) Pole-changing induction motor D) Squirrel cage induction motor
Spark plug makes use of which of the following materials for insulation A) Porcelain B) Slate C) Asbestos D) Glass
If two charges are increased by two times then force A) Decreases 9 times B) Increases 9 times C) Increases 4 times D) Decreases 4 times
The safest value of current the human body can carry for more than 3 seconds is A) 4 mA B) 9 mA C) 15 mA D) 25 mA
Equalizer rings are required in case the armature is A) Wave wound B) Lap wound C) Delta wound D) Duplex wound
Which of the following types of motor enclosure is the safest A) Totally enclosed B) Totally enclosed fan cooled C) Open type D) Semi-closed