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Free Online Mock Physics Multiple Choice Test on AC transformers
Sub Category : AC transformers Test : 5 Time Left :
1) A coil having an area 2mpower2 is placed in magnetic field which changes from 1 Wb /mpower2 to 4 Wb/mpower2 in an interval of 2 sec. The e.m.f. induced in the coil will be(1) 3 V (2) 4 V (3) 1.5 V (4) 2 V
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2) A closely wound coil of 100 turns and area of cross section 1 cmpower2 has a coefficient of self induction 1 mH. The magnetic induction in the centre of the core of the coil when a current of 2A flows in it, will be (1) 0.022 Wbm-power2 (2) 0.4 Wbmpower-2 (3) 0.8 Wbmpower-2 (4) 1 Wbm power-2
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3) Two pure inductors, each of self inductance L, are connected in parallel but are well separated from each other. The total inductance is(1)L/2 (2) L/4 (3) L (4) 2L
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4) Lenz law gives
(1) The direction of the induced current (2) The magnitude of the induced e.m.f. (3) The magnitude of the induced current (4) Both the magnitude and direction of induction current
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5) The unit of inductance is (1) volt-sec/amp (2) volt-amp/sec (3) volt/amp (4) joule/amp
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