1
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
2
GATE EE 2003
+2
-0.6
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 voltage and the flux due to it $${85^0}$$ (instead of $${90^0}$$). The errors introduced in the reading of this meter when the current is $$5$$ $$A$$ at power factors of unity and $$0.5$$ lagging are respectively
A
$$3.8$$ $$mW,$$ $$77.4$$ $$mW$$
B
$$-3.8$$ $$mW,$$ $$-77.4$$ $$mW$$
C
$$-4.2$$ $$W,$$ $$-85.1$$ $$W$$
D
$$4.2$$ $$W,$$ $$85.1$$ $$W$$
3
GATE EE 2003
+2
-0.6
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 neutral of a symmetrical $$3$$-phase system supplying a balanced star connected $$0.8$$ $$p.f.$$ inductive load. The phase sequence is $$RYB.$$ What will be the reading of this wattmeter if its pressure coil alone is reconnected between the $$B$$ and $$Y$$ phases, all other connections remaining as before?
A
$$400.0$$
B
$$519.6$$
C
$$300.0$$
D
$$692.8$$
4
GATE EE 2000
+2
-0.6
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 reading is
A
affected by both negative sequence and zero sequence voltages
B
affected by negative sequence voltages but not by zero sequence voltages
C
affected by zero sequence voltages but not by negative sequence voltages
D
not affected by negative or zero sequence voltages
GATE EE Subjects
Electric Circuits
Electromagnetic Fields
Signals and Systems
Electrical Machines
Engineering Mathematics
General Aptitude
Power System Analysis
Electrical and Electronics Measurement
Analog Electronics
Control Systems
Power Electronics
Digital Electronics
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