a) Conductors b) Semiconductors c) Dielectric d) Insulators Ans: (b)
a) Supermalloy b) Silicon c) Ferrites d) Iron Ans: (c)
a) Orbital motion electrons b) Spin of electrons c) Spin of nucleus d) Either of these e) All of the above Ans: (c)
a) 0.16 V b) 0.008 V c) 0.004 V d) 0.04 V Ans: (c)
a) Change of number of turns of coil b) The resistance of magnetic path c) Variation in voltage to the coil d) Variation in coil current Ans: (c)
a) 1 joule b) 10 joule c) 2 joule d) 20 joule Ans: (c)
a) Inductance of the coil carrying a constant DC current will increase the current b) The inductance of the coil carrying a constant DC current will not affect the current c) The inductance of the coil carrying a constant DC current will decrease the current d) The inductance of the coil carrying a constant Dc current will change the current into pulses Ans: (b)
a) 0.02 sec b) 0.015 sec c) 0.017 sec d) 0.03 sec Ans: (c)
a) 15 sin50 t b) 30 sin25 t c) 42.42 sin25 t d) 21.21 sin314 t Ans: (d)
a) The current will be reduced to half b) The current will also be doubled c) The current will remain same d) The current will increase by fourfold Ans: (b)
a) 5 mA b) 15 mA c) 25 mA d) 35 mA e) 9 mA Ans: (e)
a) Switch the power supply b) Call the doctor c) Make him lie on ground d) Provide him glucose e) Lie done on the ground and provide him artificial respiration Ans: (e)
a) Three phase 3 wire system b) Three phase 2 wire system c) Thhee phase 6 wire system d) Three phase 4 wire system Ans: (d)
a) Volume of material b) Magnetic field c) Frequency d) Either of them e) None of these Ans: (e)
a) Ferromagnetic materials b) Diamagnetic materials c) Anti-ferrimagnetic materials d) Anti-ferromagnetic materials Ans: (d)