1
AIPMT 2011 Prelims
+4
-1
An ac voltage is applied to a resistance R and an inductor L in series. If R and the inductive reactance are both equal to 3 $$\Omega$$, the phase difference between the applied voltage and the current in the circuit is
A
$$\pi /6$$
B
$$\pi /4$$
C
$$\pi /2$$
D
zero
2
AIPMT 2010 Mains
+4
-1
A condenser of capacity C is charged to a potential difference of V1. The plates of th condenser are then connected to an ideal inductor of inductance L. The current through the inductor when the potential difference across the condenser reduces to V2 is
A
$${\left( {{{C{{\left( {{V_1} - {V_2}} \right)}^2}} \over L}} \right)^{{1 \over 2}}}$$
B
$${{C\left( {V_1^2 - V_2^2} \right)} \over L}$$
C
$${{C\left( {V_1^2 + V_2^2} \right)} \over L}$$
D
$${\left( {{{C\left( {V_1^2 - V_2^2} \right)} \over L}} \right)^{{1 \over 2}}}$$
3
AIPMT 2010 Prelims
+4
-1
In the given circuit the reading of voltmeter V1 and V2 are 300 volts each. The reading of the voltmeter V3 and ammeter A are respectively

A
150V, 2.2A
B
220V, 2.2A
C
220V, 2.0A
D
100V, 2.0A
4
AIPMT 2010 Prelims
+4
-1
A 220 volt input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of the transformer is 80%, the current drwn by the primary windings of the transformer is
A
3.6 ampere
B
2.8 ampere
C
2.5 ampere
D
5.0 ampere
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