1
GATE EE 2003
+2
-0.6
The inductance of a certain moving-iron ammeter is expressed as $$L = 10 + 3\theta - {{{\theta ^2}} \over 4}\mu H,\,\,$$ where $$\,\,\theta \,\,\,$$ is the deflection in radians from the zero position. The control spring torque in $$\,\,25\,\, \times \,\,{10^{ - 6}}\,\,\,$$ Nm/radian. The deflection of the pointer in radian when the meter carries a current of $$5A,$$ is
A
$$2.4$$
B
$$2.0$$
C
$$1.2$$
D
$$1.0$$
2
GATE EE 2003
+2
-0.6
An ac voltmeter uses the circuit shown below, where the $$PMMC$$ meter has an internal resistance of $$100$$$$\Omega$$ and requires a dc current of $$1$$ $$mA$$ for full scale deflection. Assuming the diodes to be ideal, the value of $${R_s}$$ to obtain full scale deflection with $$100$$ $$V$$ (ac rms) applied to the input terminal would be
A
$$80\,\,k\Omega$$
B
$$89\,\,k\Omega$$
C
$$89.9\,\,k\Omega$$
D
$$90\,\,k\Omega$$
3
GATE EE 2001
+2
-0.6
A $$100$$ $$\mu A$$ ammeter has an internal resistance of $$100\,\Omega$$. For extending its range to measure $$500$$ $$\mu A$$, the shunt required is of resistance (in $$\Omega$$)
A
$$20.0$$
B
$$22.22$$
C
$$25.0$$
D
$$50.0$$
4
GATE EE 1999
+2
-0.6
A current of $$\left[ {2 + \sqrt 2 \sin \left( {314t + 30} \right) + 2\sqrt 2 \cos \left( {952t + 45} \right)} \right]$$ is measured with a thermocouple type. $$5A$$ full scale, class $$1$$ meter. The meter reading would like in the range,
A
$$5A \pm 1\%$$
B
$$\left( {2 + 3\sqrt 2 } \right)A \pm 1\%$$
C
$$3A \pm 1.7\%$$
D
$$2A \pm 0.5\%$$
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