A 3 phase balanced supply feeds 3 phase unbalanced load. Power supplied to the l

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Question
A 3 phase balanced supply feeds 3 phase unbalanced load. Power supplied to the load can be measured by using
1. 2 wattmeter
2. one wattmeter
3. 3 wattmeter
Which of the above statements is correct?
Options
A. 1 and 2
B. 1 and 3
C. 2 and 3
D. 3 alone

Correct Answer

1 and 3

Explanation

A minimum of 2 wattmeters is required to measure 3 phase power. Of course power can be measured by putting one wattmeter in each phase.

Networks Analysis and Synthesis problems

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1. A series RC circuit has R = 5 ? and C = 10 ?F. The current in the circuit is 5 sin 20000t. The applied voltage is
Options
A. 252 sin (20000t + 45�)
B. 252 sin (20000t - 45�)
C. 252 sin 20000t
D. 252 sin (20000t - 90�)

2. A sinusoidal voltage has peak to peak value of 100 V. The rms value is
Options
A. 50 V
B. 70.7 V
C. 35.35 V
D. 141.41 V

3. An RLC series circuit is underdamped. To make it overdamped, the value of R
Options
A. has to be increased
B. has to be decreased
C. has to be increased to infinity
D. has to be reduced to zero

4. In a minimum function
Options
A. the degree of numerator and denominator are equal
B. the degree of numerator and denominator are unequal
C. the degree of numerator is one more than degree of denominator
D. the degree of numerator is one less than degree of denominator

5. Which of the following pairs are correctly matched?
1. Brune's realisation : realisation with ideal transformer.
2. Cauer realisation : ladder realisation.
3. Bott Duffin realisation : with non ideal transformer.
Select the answer using the following codes:
Options
A. 1, 2 and 3
B. 2 and 3
C. 1 and 3
D. 1 and 2

6. The driving-point impedance Z(s) of a network has a pole-zero locations as shown in the figure. If Z(0) = 3, then Z (s) is
Options
A.
B.
C.
D.

7. The degree of the nodes 1, 2, 3, 4 is
Options
A. 2
B. 3
C. 2 for 1, 2, 3, and 3 for 4
D. all 3

8. In the circuit of figure the voltage across capacitor when switch is closed at t = ? is
Options
A. 0 V
B. 20 V
C. very large
D. 7.5 V

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