1
GATE EE 2004
+2
-0.6
A moving coil of a meter has $$100$$ turns, and a length and depth of $$10$$ $$mm$$ and $$20$$ $$mm$$ respectively. It is positioned in a uniform radial flux density of $$200$$ $$mT.$$ The coil carries a current of $$50$$ $$mA.$$ The torque on the coil is
A
$$200\,\,\mu Nm$$
B
$$100\,\,\mu Nm$$
C
$$2\,\,\mu Nm$$
D
$$1\,\,\mu Nm$$
2
GATE EE 2004
+2
-0.6
A moving iron ammeter produces a full scale torque of $$240$$ $$\,\mu Nm$$ with a deflection of $${120^ \circ }$$ at a current of $$10$$ $$A$$. The rate of change of self inductance $$\left( {\mu H/radian} \right)$$ of the instrument at full scale is
A
$$2.0\,\mu H/$$radian
B
$$4.8\,\mu H/$$radian
C
$$12.0\,\mu H/$$radian
D
$$114.6\,\mu H/$$radian
3
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
$$1.0$$
4
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
$$90\,\,k\Omega$$
EXAM MAP
Medical
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