1
GATE EE 2006
+2
-0.6
An energy meter connected to an immersion heater (resistive) operating on an $$AC$$ $$230V,$$ $$50$$ $$Hz,$$ $$AC$$ single phase source reads $$2.3$$ units ($$kWh$$) in $$1$$ hour. The heater is removed from the supply and now connected to a $$4000$$ $$V$$ peak to peak square wave source of $$150$$ $$Hz.$$ The power in $$kW$$ dessipated by the heater will be
A
$$3.478$$
B
$$1.739$$
C
$$1.540$$
D
$$0.870$$
2
GATE EE 2005
+2
-0.6
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 $$–2.5$$ $$kW$$ respectively. The total power and the power factor respectively are
A
$$13.0$$ $$kW,$$ $$0.334$$
B
$$13.0$$ $$kW,$$ $$0.684$$
C
$$8.0$$ $$kW,$$ $$0.52$$
D
$$8.0$$ $$kW,$$ $$0.334$$
3
GATE EE 2004
+2
-0.6
A single-phase load is connected between $$R$$ and $$Y$$ terminals of a $$415$$ $$V,$$ symmetrical, $$3$$-phase, $$4$$-wire system with phase sequence $$RYB$$. A wattmeter is connected in the system as shown in figure. The power factor of the load is $$0.8$$ lagging. The wattmeter will read
A
$$-795$$ $$W$$
B
$$-597$$ $$W$$
C
$$+597$$ $$W$$
D
$$+795$$ $$W$$
4
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
EXAM MAP
Medical
NEET