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
+1
-0.3
The circuit in fig is used to measure the power consumed by the load. The current coil and the voltage coil of the watt meter have $$0.02$$ $$\Omega$$ and $$1000$$ $$\Omega$$ resistance respectively. The measured power compared to the load power will be
A
$$0.4\%$$ less
B
$$0.2\%$$ less
C
$$0.2\%$$ more
D
$$0.4\%$$ more
3
GATE EE 2004
+2
-0.6
A single-phase load is connected between $$R$$ and $$Y$$ terminals of a $$415$$ $$V,$$ symmetrical, $$3$$-phase, $$4$$-wire system with phase sequence $$RYB$$. A wattmeter is connected in the system as shown in figure. The power factor of the load is $$0.8$$ lagging. The wattmeter will read
A
$$-795$$ $$W$$
B
$$-597$$ $$W$$
C
$$+597$$ $$W$$
D
$$+795$$ $$W$$
4
GATE EE 2004
+2
-0.6
A dc A-h meter is rated for 15 A, 250V. The meter constant is 14.4 A-sec/rev. The meter constant at rated voltage may be expressed as
A
3750 rev/kWh
B
3600 rev/kWh
C
1000 rev/kWh
D
960 rev/kWh
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