Measurement of Energy and Power · Electrical and Electronics Measurement · GATE EE

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Marks 1

GATE EE 2018
Two wattmeter method is used for measurement of power in a balanced three-phase load supplied from a balanced three-phase system. If one of the wattme...
GATE EE 2015 Set 2
A 3-phase balanced load which has a power factor of 0.707 is connected to a balanced supply. The power consumed by the load is 5 kW. The power is meas...
GATE EE 2014 Set 1
Power consumed by a balanced $$3$$-phase, $$3$$-wire load is measured by the two wattmeter method. The first wattmeter reads twice that of the second....
GATE EE 2014 Set 3
An $$LPF$$ wattmeter of power factor $$0.2$$ is having three voltage settings $$300V,$$ $$150V$$ and $$75V,$$ and two current settings $$5 A$$ and $$1...
GATE EE 2014 Set 2
While measuring power of a three-phase balanced load by the two-wattmeter method, the readings are $$100$$ $$W$$ and $$250$$ $$W$$. The power factor o...
GATE EE 2012
For the circuit shown in the figure, the voltage and current expressions are $$v\left( t \right) = {E_1}\sin \left( {\omega t} \right) + {E_3}\sin \l...
GATE EE 2011
Consider the following statement: (i) The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the current coi...
GATE EE 2010
A wattmeter is connected as shown in the fig. the wattmeter reads ...
GATE EE 2006
A sampling wattmeter (that computes power from simultaneously sampled values of voltage and current) is used to measure the average power of a load. T...
GATE EE 2004
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 $$0.02$$ $$\Omega $...
GATE EE 2002
The line to line input voltage to the $$3$$ phase, $$50$$ Hz, ac circuit shown in fig is $$100$$ $$V$$ $$r.m.s$$ Assuming that the phase sequence is ...
GATE EE 2001
The minimum number of wattmeter(s) required to measure 3 $$-$$ phase, 3 $$-$$ wire balanced or unbalanced power is
GATE EE 1999
Electro dynamic type watt meters have large errors while measuring power in a.c circuits at low power factor conditions, since the voltage across and ...
GATE EE 1997
A dynamometer type wattmeter responds to the
GATE EE 1996
A water boiler at home is switched on to the $$A.C$$ mains supplying power at $$230$$ $$V/50$$ $$Hz.$$ The frequency of instantaneous power consumed b...
GATE EE 1996
The moving coil in a dynamometer wattmeter is connected
GATE EE 1993
VRN, VYN and VBN are the instantaneous line to neutral voltages and iR, iY and iB are instantaneous line currents in a balanced three-phase circuit, ...

Marks 2

GATE EE 2017 Set 1
The load shown in the figure is supplied by a $$400$$ $$V$$ (line-to-line) $$3$$-phase source ($$RYB$$ sequence). The load is balanced and inductive, ...
GATE EE 2015 Set 2
The coils of a wattmeter have resistances $$0.01$$ $$\Omega $$ and $$1000$$ $$\Omega $$; their inductances may be neglected. The wattmeter is connecte...
GATE EE 2009
The figure shows a three phase delta connected load supplied from a $$400V,$$ $$50Hz,$$ $$3\phi $$ balanced source. The pressure coil and current coil...
GATE EE 2007
A $$3$$ $$V$$ $$dc$$ supply with an internal resistance of $$2\,\,\Omega $$ supplies a passive non-linear resistance characterized by the relation $${...
GATE EE 2006
An energy meter connected to an immersion heater (resistive) operating on an $$AC$$ $$230V,$$ $$50$$ $$Hz,$$ $$AC$$ single phase source reads $$2.3$$ ...
GATE EE 2005
Two wattmeter's, which are connected to measure the total power on a three-phase system supplying a balanced load, read $$10.5$$ $$kW$$ and $$–2.5$$ $...
GATE EE 2004
A single-phase load is connected between $$R$$ and $$Y$$ terminals of a $$415$$ $$V,$$ symmetrical, $$3$$-phase, $$4$$-wire system with phase sequence...
GATE EE 2004
A dc A-h meter is rated for 15 A, 250V. The meter constant is 14.4 A-sec/rev. The meter constant at rated voltage may be expressed as
GATE EE 2003
The voltage-flux adjustment of a certain $$1$$-phase $$220$$ $$V$$ induction watt-hour meter is altered so that the phase angle between the applied vo...
GATE EE 2003
A wattmeter reads $$400$$ $$W$$ when its current coil is connected in the $$R$$ phase and its pressure coil is connected between this phase and the ne...
GATE EE 2000
The two wattmeter method is used to measure active power on a three phase, three wire system. If the phase voltage is unbalanced, then the power readi...
GATE EE 1999
The voltage phasor of a circuit is $$10\angle {15^ \circ }V$$ and the current phasor is $$2\angle - {45^ \circ }A.$$ The active and the reactive powe...
GATE EE 1997
For the circuit shown in Fig, the wattmeter reading will be .... W and the power dissipted in the load is ......W ...

Marks 5

GATE EE 2000
A $$3$$ - $$\phi $$ load operates with balanced voltages applied to its terminals, and draws balanced currents. The potential coil of a moving coil wa...
GATE EE 1998
A symmetrical $$400V,$$ $$3$$-$$\phi $$ supply is connected to the network shown in fig. The phase sequence is $$RYB.$$ Find the reading on the wattme...
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