1
GATE EE 2013
+1
-0.3
The input impedance of the permanent magnet moving coil $$(PMMC)$$ voltmeter is infinite. Assuming that the diode shown in the figure below is ideal, the reading of the voltmeter in Volts is
A
$$4.46$$
B
$$3.15$$
C
$$2.23$$
D
$$0$$
2
GATE EE 2013
+1
-0.3
Three moving iron type voltmeters are connected as shown below. Voltmeter readings are $$V,$$ $${V_1}$$ and $${V_2}$$ , as indicated. The correct relation among the voltmeter readings is
A
$$V = {{{V_1}} \over {\sqrt 2 }} + {{{V_2}} \over {\sqrt 2 }}$$
B
$$V = {V_1} + {V_2}$$
C
$$V = {V_1}{V_2}$$
D
$$V = {V_2} - {V_1}$$
3
GATE EE 2013
+2
-0.6
A strain gauge forms one arm of the bridge shown in the figure below and has a nominal resistance without any load as $$\,{R_s} = 300\Omega .$$ Other bridge resistance are $$\,{R_1} = {R_2} = {R_3} = 300\Omega .\,\,$$ The maximum permissible current through the strain gauge is $$20$$ $$mA.$$ During certain measurement when the bridge is excited by maximum permissible voltage and the strain gauge resistance is increased by $$1$$% over the nominal value, the output voltage $${V_0}$$ in $$mV$$ is
A
$$56.02$$
B
$$40.83$$
C
$$29.85$$
D
$$10.02$$
4
GATE EE 2013
+1
-0.3
A single-phase transformer has no-load loss of 64 W, as obtained from an open circuit test. When a short-circuit test is performed on it with 90% of the rated currents flowing in its both LV and HV windings, he measured loss is 81 W. The transformer has maximum efficiency when operated at
A
50.0% of the rated current.
B
64.0% of the rated current.
C
80.0% of the rated current.
D
88.8% of the rated current.
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