GATE EE
Electrical and Electronics Measurement
Basic of Indicating Instruments
Previous Years Questions

## Marks 1

Two balanced three-phase loads, as shown in the figure, are connected to a $$100\sqrt 3$$ V, three-phase, 50 Hz main supply. Given Z1 = (18 + j24) $$... Match the following. ... A ($$0-50A$$) moving coil ammeter has a voltage drop of$$0.1V$$across its terminals at full scale deflection. The external shunt resistanc... The saw-tooth voltage waveform shown in the figure is fed to a moving iron voltmeter. Its reading would be close to _______. ... The input impedance of the permanent magnet moving coil$$(PMMC)$$voltmeter is infinite. Assuming that the diode shown in the figure below is ideal, ... Three moving iron type voltmeters are connected as shown below. Voltmeter readings are$$V,{V_1}$$and$${V_2}$$, as indicated. The correct rela... A periodic voltage waveform observed on an oscilloscope across a load is shown. A permanent magnet moving coil$$(PMMC)$$meter connected across the s... An ammeter has a current range of$$0$$-$$5A,$$and its internal resistance is$$0.2\Omega $$. In order to change the range to$$0$$-$$25A$$we n... A$$PMMC$$voltmeter is connected across a series combination of a$$DC$$voltage source$${V_1} = 2V$$and$$AC$$voltage source$${V_2}\left( t \rig...
A galvanometer with a full scale current of $$10$$ $$mA$$ has a resistance of $$1000$$$$\Omega$$. The multiplying power (the ratio of measured curren...
The effect of stray magnetic fields on the actuating torque of a portable instrument is maximum when the operating field of the instrument and the str...
A Manganin swamping resistance is connected in series with a moving coil ammeter consisting of a milli-ammeter and a suitable shunt in order to
A d.c. voltmeter has a sensitivity of $$1000$$$$\Omega /volt.$$ When it measures half full scale in $$100$$ $$V$$ range, the current through the voltm...
A moving coil galvanometer is made into a d.c. ammeter by connecting
An advantage of a permanent magnet moving coil instrument is that it is
The scale of a voltmeter is uniform. Its type is
For a given frequency, the deflecting torque of an induction ammeter is directly proportional to
Four ammeters $$M1, M2, M3$$ and $$M4$$ with the following specifications are available. A current of $$1$$ $$A$$ is to be measured. To obtain mini...
Two $$100V$$ full scale $$PMMC$$ type D.C voltmeter having figure of merits ($$FOM)$$ of $$10k\Omega /V$$ and $$20k\Omega /V$$ are connected in series...
A $$0$$-$$10$$ $$mA$$ $$PMMC$$ ammeter reads $$4$$ $$mA$$ in a circuit. Its bottom control spring snaps suddenly. The meter will now read nearly
An unshielded moving iron voltmeter is used to measure the voltage in an a.c. circuit. If a stray d.c. magnetic field having a component along the axi...
The current $$i(t)$$ passing through $$10\Omega$$ resistor as shown in fig $$A$$. as a waveform as shown in fig $$B.$$ Then the reading of the d.c ...

## Marks 2

A 0-1 Ampere moving iron ammeter has an internal resistance of 50 m$$\Omega$$ and inductance of 0.1 mH. A shunt coil is connected to extend its range...
A dc voltage with ripple is given by $$v\left( t \right)\,\,\,\, = \,\,\,\,\left[ {100 + 10\sin \left( {\omega t} \right) - 5\sin \left( {3\omega t} \... A periodic waveform observed across a load is represented by$$$V\left( t \right) = \left\{ {\matrix{ {1 + \sin \,\omega t} & {0 \le \omega t ... Two ammeters $$X$$ and $$Y$$ have resistances of $$1.2$$ $$\Omega$$ and $$1.5$$ $$\Omega$$ respectively and they give full-scale deflection with $$1... The reading of voltmeter$$(rms)$$in volts, for the circuit shown in the figure is ______. ... The dc current flowing in a circuit is measured by two ammeters, one PMMC and another electrodynamometer type, connected in series. The PMMC meter con... An analog voltmeter uses external multiplier settings. With a multiplier setting of$$20\,\,k\Omega ,$$it reads$$440V$$and with a multiplier s... An average-reading digital multimeter reads$$10V$$when fed with a triangular wave, symmetric about the time axis. For the same input an rms reading ... A current of$$ - 8 + 6\sqrt 2 \left( {\sin \,\omega t + {{30}^0}} \right)\,\,A$$is passed though three meters. They are a center zero$$PMMC$$meter... A$$1000VDC$$supply has two$$1-core$$cables as its positive and negative leads: their insulation resistances to earth are$$4\,\,M\Omega ... A DC ammeter has a resistance of $$0.1$$$$\Omega$$ and its current range is $$0$$ – $$100A.$$ If the range is to be extended to $$0$$ –$$500A,$$ the ... 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 radi... 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 ra... The inductance of a certain moving-iron ammeter is expressed as $$L = 10 + 3\theta - {{{\theta ^2}} \over 4}\mu H,\,\,$$ where $$\,\,\theta \,\,\,$$ ... 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$...
A $$100$$ $$\mu A$$ ammeter has an internal resistance of $$100\,\Omega$$. For extending its range to measure $$500$$ $$\mu A$$, the shunt required i...
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 thermocoup...

## Marks 5

For the given circuit the internal resistance of the ammeters as well as that of the current coil of the wattmeter are zero, and the voltmeters have a...
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Joint Entrance Examination