Electrical Knowledge by Sachin Sir
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Q) The earth’s potential is taken as
A.Infinite B.Supply voltage C.1 volt D.Zero
Q) In house wiring, black and green wires indicate
A) Earth and neutral respectively B) Phase and neutral respectively C) Phase and earth respectively D) Neutral and earth respectively
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Q) The materials having low retentivity are suitable for making
A. Weak magnet B. Temporary magnet C. Permanent magnet D. None of the above
Q) A permeable substance is one
A Which is a good conductor B Which is a bad conductor C Which is a strong magnet D Through which the magnetic lines of force can pass very easily
Q) Tesla is a unit of
A Field strengthm B Inductance C Flux density D Flux
Inductive load me Current lag and Voltage lead kr rha hai....
Capacitive load me Current lead and voltage lag kr rha hai.....
In Resistive load voltage and current both are in phase....
Q) The operating speed of a relay depends upon the
A) Rate of flux built up B) Armature core air-gap C) Spring tension D) All of these
Q) The actuating quantity for the relays may be
A) Magnitude B) Frequency C) Phase angle D) Any of these
Q) Purpose of backup protection is
A) To increase the speed B) To increase a reach C) To leave no blind spot D) To guard against failure of primary
Q) Isolators used in transmission lines are capable of breaking :
A) Fault current B) No current C) Charging current D) Load current
Q) An isolator is meant for
A) Breaking abnormal current. B) Making under fault condition. C) Breaking the circuit under no-load condition. D) None of the above.
The waveform of armature MMS in a DC machine is_____
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