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

Power System - II (3150911) MCQs

MCQs of Basic Principles

Showing 1 to 10 out of 135 Questions

For a long transmission line, for a particular receiving end voltage, when sending end voltage is calculated, it is more than the actual value when calculated by

(a)	Load end capacitance method
(b)	Nominal T method
(c)	Nominal π method
(d)	None of the above methods

The voltages at the two ends of a line are 132 kV and its reactance is 40 Ω. The capacity of the line is

(a)	435.6 MW
(b)	217.5 MW
(c)	251.5 MW
(d)	500 MW

The size of conductor on modern EHV lines is obtained based on

(a)	Voltage drop
(b)	Current density
(c)	Corona
(d)	(a) and (b)

For stability and economic reasons we operate the transmission line with power angle in the range

(a)	10° to 25°
(b)	30° to 45°
(c)	60° to 75°
(d)	65° to 80°

Phase modifier is normally installed in the case of

(a)	Short transmission lines
(b)	Medium length lines
(c)	Long length lines
(d)	For all length lines

Ferranti effect on long overhead lines is experienced when it is

(a)	Lightly loaded
(b)	On full load at unity power factor
(c)	On full load at 0.8 (lag) power factor
(d)	In all these cases

The presence of earth in case of overhead lines

(a)	Increases the capacitance
(b)	Increases the inductance
(c)	Decreases the capacitance
(d)	Decreases the inductance

An alternator is delivering a load current, its percent regulation is found to be zero. The type of load it delivers is

(a)	Capacitive
(b)	Inductive
(c)	Resistive
(d)	None of the above

An alternator is delivering a balanced load at unity power factor, the phase angle between line voltage and line current is

(a)	90°
(b)	60°
(c)	30°
(d)	0°

10.

The charging reactance of 50 km length of line is 1500 Ω. The charging reactance for 100 km length of line will be

(a)	1500 Ω
(b)	3000 Ω
(c)	750 Ω
(d)	600 Ω

Showing 1 to 10 out of 135 Questions