Q1 if a watt hour meter draws 15 w and 113 vars from a, Ask an Expert

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Q1. If a watt hour meter draws 1.5 W and 11.3 vars from a potential transformer, and 1.2 W and 1.8 vars from a current transformer, the total apparent power burden placed on the current transformer is

A. 1.92 VA

B. 3.24 VA.

C. 2.16 VA.

D. 4.68 VA.

Q2. If a 0.6 accuracy class current transformer has a phase angle β of +10' at 100% rated current, the ratio correction factor is

A. 0.989.

B. 1.005.

C. 0.995.

D. 1.007.

Q3. For a 1.2 accuracy class potential transformer used at a lagging phase angle γ of 10', the RCF value is

A. 0.977.

B. 0.991.

C. 0.988.

D. 0.999.

Q4. In a single-phase wattmeter application at full load, the potential transformer phase-angle error γ is -8' and the current transformer phase-angle error β is -3'. If the load operates at a 0.90 leading pf, the combined PACF of the transformer is

A. 0.99930.

B. 1.00014.

C. 0.99986.

D. 1.00070.

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Electrical & Electronics, Engineering

Category:- Electrical & Electronics
Reference No.:- M91972219

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