a) A D.C. voltage b) An A.C. voltage c) No voltage d) Pulse voltage Ans: (c)
a) A.C. b) D.C. c) No voltage d) Pulse voltage Ans: (b)
a) Density of the magnetic lines of force b) Active length of conductor in exciting field c) Velocity of the loop d) Length of conductor, velocity and flux density Ans: (d)
a) Changes its intensity constantly b) Changes its direction with constant density c) Changes in intensity with its direction periodically d) Changes its intensity with its direction randomly Ans: (c)
a) Magnetic field and electric field b) Magnetic field and electric current c) Electric field and law of induction d) Law of induction and dynamo-electric principle Ans: (b)
a) DC b) AC single phase c) AC three phase d) AC two phase Ans: (a)
a) The conductor must have diameter b) The conductor must have current passing through it c) Magnetic field must be intensified d) The conductor must be in coil from Ans: (b)
a) A magnetic field exerts a force on-line conductor b) The cause of force effect lines in the fact that original magnetic field and that of line conductor affected each other c) The repulsion takes place in the direction of mutually reducing field forces d) All the above statements are correct Ans: (d)
a) Oil Natural Air Natural (ONAN) cooled transformer b) Dry type transformer c) Oil Natural Air Force (ONAF) cooled transformer d) Oil Forced Water Force (OFWF) cooled transformer Ans: (b)
a) IS: 2026 b) IS: 325 c) IS: 2208 d) IS: 3427 Ans: (b)
a) 0.746 W b) 0.746 kW c) 7.46 W d) 7.46 kW Ans: (b)
a) Porcelain type b) Condenser type c) Oil-filled type d) (b) or (c) Ans: (d)
a) 0.05 b) 0.4 c) 1.0 d) 0.5 Ans: (a)
a) Primary winding b) Secondary winding c) Laminations d) None of the above Ans: (c)
a) 10 b) 4 c) 5 d) 3 Ans: (a)