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763.

The hysteresis loop of a magnetic material has an area of 5 cm² with the scales given as 1 cm = 2 AT and 1 cm = 50 mWb. At 50 Hz, the total hysteresis loss is [2 marks]
(a) 15 W
(b) 20 W
(c) 25 W
(d) 50 W

asked in Electrical Engineering, 2001

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764.

Given the potential function in free space to be V(x) = (50x²+50y²+50z²) volts, the magnitude (in volts/metre) and the direction of the electric field at a point (1,-1,1), where the dimensions are in metres, are [2 marks]
(a) 100; (i+j+k)
(a) 100/√3; (i-j+k)
(a) 100/√3; (-i-j-k)/√3
(a) 100/√3; (i-j-k)/√3

asked in Electrical Engineering, 2001

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765.

Consider the star network shown in Fig. The resistance between terminals A and B with C open is 6Ω, between terminals B and C with A open is 11Ω, and between terminals C and A with B open is 9Ω. Then

[2 marks]
(a) R_A =4Ω , R_B =2Ω , R_C = 5Ω
(a) R_A =2Ω , R_B =4Ω , R_C = 7Ω
(a) R_A =3Ω , R_B =3Ω , R_C =4Ω
(a) R_A =5Ω , R_B =1Ω , R_C = 10Ω

asked in Electrical Engineering, 2001

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766.

A connected network of N>2 nodes has at most one branch directly connecting any pair of nodes. The graph of the network
[2 marks]
(a) must have at least N branches for one or more closed paths to exist
(b) can have an unlimited number of branches
(c) can only have at most N branches
(d) can have a minimum number of branches not decided by N

asked in Electrical Engineering, 2001

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767.

The electric field E (in volts/metre) at the point (1,1,0) due to a point charge of +1µC located at (-1,1,1) (coordinates in metres) is
[2 marks]
(a) [10^-6/(20√5 πε_o)] (2i - k)
(b) [10^-6/(20πε_o)] (2i - k)
(c) [-10^-6/(20√5 πε_o)] (2i - k)
(d) [-10^-6/(20πε_o)] (2i - k)

asked in Electrical Engineering, 2001

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768.

In case of an armature controlled separately excited dc motor drive with closed loop speed control, an inner current loop is useful because it
[1 mark]
(a) limits the speed of the motor to a safe value
(b) helps in improving the drive energy efficiency
(c) limits the peak current of the motor to the permissible value
(d) reduces the steady state speed error

asked in Electrical Engineering, 2001

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