The working of dynamo is based on principle of
|
(a) Electromagnetic induction |
(b) Conversion of energy into electricity |
|
(c) Magnetic effects of current |
(d) Heating effects of current |
(a) Electromagnetic induction
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In a transformer, number of turns in the primary are 140 and that in the secondary are 280. If current in primary is 4A then that in the secondary is
|
(a) 4 A |
(b) 2 A |
(c) 6 A |
(d) 10 A |
Which of the following figures correctly shows the phase relation between the input signal and the output signal of triode amplifier
|
(a)
|
(b)
|
|
(c)
|
(d)
|
Three capacitors each of capacity 4μF are to be connected in such a way that the effective capacitance is 6 μF. This can be done by
|
(a) Connecting them in parallel |
(b) Connecting two in series and one in parallel |
|
(c) Connecting two in parallel and one in series |
(d) Connecting all of them in series |
The smallest temperature difference that can be measured with a combination of a thermocouple of thermo e.m.f. 30mV per degree and a galvanometer of 50 ohm resistance, capable of measuring a minimum current of 3 × 10–7 amp is
|
(a) 0.5 degree |
(b) 1.0 degree |
(c) 1.5 degree |
(d) 2.0 degree |
