1
GATE EE 2012
+1
-0.3
A periodic voltage waveform observed on an oscilloscope across a load is shown. A permanent magnet moving coil $$(PMMC)$$ meter connected across the same load reads
A
$$4$$ $$V$$
B
$$5$$ $$V$$
C
$$8$$ $$V$$
D
$$10$$ $$V$$
2
GATE EE 2012
+2
-0.6
An analog voltmeter uses external multiplier settings. With a multiplier setting of $$20\,\,k\Omega ,$$ it reads $$440$$ $$V$$ and with a multiplier setting of $$80$$ $$k\Omega ,$$ it reads $$352$$ $$V.$$ For a multiplier setting of $$40$$ $$k\Omega ,$$ the voltmeter reads
A
$$371$$ $$V$$
B
$$383$$ $$V$$
C
$$394$$ $$V$$
D
$$406$$ $$V$$
3
GATE EE 2012
+1
-0.3
The bridge method commonly used for finding mutual inductance is
A
Heaviside Campbell bridge
B
Schering bridge
C
De Sauty bridge
D
Wien Bridge
4
GATE EE 2012
+1
-0.3
For the circuit shown in the figure, the voltage and current expressions are
$$v\left( t \right) = {E_1}\sin \left( {\omega t} \right) + {E_3}\sin \left( {3\omega t} \right)$$ and
$$i\left( t \right) = {{\rm I}_1}\sin \left( {\omega t - {\varphi _1}} \right) + {{\rm I}_3}\sin \left( {3\omega t - {\varphi _3}} \right) + {{\rm I}_5}\sin \left( {5\omega t} \right)$$

The average power measured by the Wattmeter is

A
$${1 \over 2}{E_1}{{\rm I}_1}\cos {\phi _1}$$
B
$${1 \over 2}\left[ {{E_1}{{\rm I}_1}\cos {\phi _1} + {E_1}{{\rm I}_3}\cos {\phi _3} + {E_1}{{\rm I}_5}} \right]$$
C
$${1 \over 2}\left[ {{E_1}{{\rm I}_1}\cos {\phi _1} + {E_3}{{\rm I}_3}\cos {\phi _3}} \right]$$
D
$${1 \over 2}\left[ {{E_1}{{\rm I}_1}\cos {\phi _1} + {E_3}{{\rm I}_1}\cos {\phi _1}} \right]$$
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