1
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
Two coils of self inductance 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is
A
16 mH
B
10 mH
C
6 mH
D
4 mH
2
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
A coil of inductive reactance 31 $$\Omega $$ has a resistance of 8 $$\Omega $$. It is placed in series with a condenser of capacitative reactance 25 $$\Omega $$. The combination is connected to an a.c. source of 110 V. The power factor of the circuit is
A
0.33
B
0.56
C
0.64
D
0.80
3
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
The core of a transformer is laminated because
A
ratio of voltage in primary and secondary may be increased
B
energy losses due to eddy currents may be minimised
C
the weight of the transformer may be reduced
D
rusting of the core may be prevented.
4
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
A transistor-oscillator using a resonant circuit with an inductor L (of negligible resistance) and a capacitor C in series produce oscillations of frequency $$f$$. If L is doubled and C is changed to 4C, the frequency will be
A
$$f/2$$
B
$$f/4$$
C
$$8f$$
D
$$f/2$$$$\sqrt 2 $$
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