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499.

A 50 Hz, bar primary CT has a secondary with 500 turns. The secondary supplies 5A current into a purely resistive burden of 1Ω. The magnetizing ampere-turns is 200.
The core flux in the CT, under the given operating condition is
[2 marks]
(a) 0
(b) 45.0 µWb
(c) 22.5 mWb
(d) 100.0 mWb

asked in Electrical Engineering, 2004

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500.

A 50 Hz, bar primary CT has a secondary with 500 turns. The secondary supplies 5A current into a purely resistive burden of 1Ω. The magnetizing ampere-turns is 200. The phase angle between the primary and secondary current is [2 marks]
(a) 4.6°
(b) 85.4°
(c) 94.6°
(d) 175.4°

asked in Electrical Engineering, 2004

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501.

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

[2 marks]
(a) -795 W
(b) -597 W
(c) +597 W
(d) +795 W

asked in Electrical Engineering, 2004

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502.

A moving iron ammeter produces a full-scale torque of 240 µNm with a deflection of 120° at a current of 10 A. The rate of change of self inductance (µH/radian) of the instrument at full scale is [2 marks]
(a) 2.0 µH/radian
(b) 4.8 µH/radian
(c) 12.0 µH/radian
(d) 114.6 µH/radian

last reply by CpjJwWHV • 14 years ago • asked in Electrical Engineering, 2004

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503.

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 [2 marks]
(a) 3750 rev/kWh
(b) 3600 rev/kWh
(c) 1000 rev/kWh
(d) 960 rev/kWh

asked in Electrical Engineering, 2004

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504.

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 radial flux density of 200 mT. The coil carries a current of 50 mA. The torque on the coil is
[2 marks]
(a) 200 µNm
(b) 100 µNm
(c) 1000 µNm
(d) 1 µNm

last reply by CpjJwWHV • 14 years ago • asked in Electrical Engineering, 2004

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