MCQs of Basic Principles (Power System - II - 3150911)

Power System - II (3150911) MCQs

MCQs of Basic Principles

Showing 71 to 80 out of 135 Questions

71.

In a long transmission line under no load condition

(a)	Receiving end voltage is less than sending end voltage
(b)	Sending end voltage is less than receiving end voltage
(c)	Sending end voltage is equal to receiving end voltage
(d)	None of above

72.

Ferranti effect on long overhead line is experienced when it is

(a)	Lightly loaded
(b)	On full load at unity power factor
(c)	On full load at 0.8 power factor (lead)
(d)	On any load

73.

The ABCD constants of three phase transposed transmission line with linear and passive elements

(a)	Are always equal
(b)	Never equal
(c)	A and B are equal
(d)	B and C are equal

74.

The value of ABCD constants for short transmission line are respectively

(a)	Z, 0, 1 and 1
(b)	0, 1, 1 and Z
(c)	1, Z, 0 and 1
(d)	1, 1, Z and 0

75.

The angle of constant A of the transmission line normally lies between

(a)	90° to 70°
(b)	70° to 40°
(c)	40° to 10°
(d)	10° to 0°

76.

For a transmission line with resistance R, reactance X and negligible capacitance, generalized constant A is

(a)	0
(b)	1
(c)	R + jX
(d)	R + X

77.

The value of constant A of transmission line

(a)	Increases with the increase in length of line
(b)	Decreases with the increase in length of line
(c)	Is independent of length of line
(d)	Is dependent on length of line

78.

For a medium length transmission line constant A is

(a)	Equal to constant B
(b)	Equal to constant C
(c)	Equal to constant D
(d)	None of above

79.

The generalized constant A for a medium line has magnitude

(a)	Close to but less than 1
(b)	Close to but greater than 1
(c)	Nearly equal to the series impedance of line
(d)	None of above

80.

200 kV, 20 km long 3-phase transmission line has following ABCD constants. A = D = 0.96∠3°, B = 55∠65° Ω/phase, C = 0.0005∠80° ℧/phase. Its charging current per phase is

(a)	11/√3 A
(b)	11 A
(c)	220 A
(d)	220/√3 A

Showing 71 to 80 out of 135 Questions