Power system MCQ's

1.What is the line to earth capacitance value of the short transmission line. 

A) Low 
B) Medium 
C) High
D) Negligible 

2.Out of the following types of energy sources, which is non-renewable?

A) Solar energy
B) Wind energy
C) Coal
D) Biomass

3. The presence of earth in case of overhead lines?

A) Increase the capacitance 
B) Decrease the capacitance 
C) Increase the inductance
D) Decrease the inductance

4. The self-inductance of a long cylindrical conductor due to its internal flux linkages is 1 kH/m. If the diameter of the conductor is doubled, then the self-inductance of the conductor due to its internal flux linkages would be?

A) 0.5 kH/m
B) 1 kH/m
C) 1.414kH/m
D)  4kH/m

5.A bundled conductor line compared to a single conductor line (with same conductor cross-sectional area and same mean distance between conductors) has Self GMD, Mutual GMD and Inductance/phase?

A) Lower, nearly same and higher
B) Higher, lower and nearly same
C) Higher, nearly same and lower
D) Lower, higher and higher

6. What is the value of charging current in short transmission lines?

A) Less than medium transmission lines
B) Equal to medium transmission lines
C) More than medium transmission lines
D) More than long transmission lines

7. For a three phase transmission line, the conductors are spaced horizontally with spacing between adjacent conductors equal to‘d’. If the conductors are rearranged to form an equilateral triangle of side‘d’, then 

A) The line capacitance and inductance both increase
B) The line capacitance and inductance both decrease
C) The line inductance increases while the capacitance decreases
D) The line inductance decreases while the capacitance increases

geometric mean distance,

8. The given figure represents :

A) ultra-long transmission line
B) short transmission line
C) long transmission line
D) medium transmission line

9. In Nominal-T configuration of medium transmission line, the shunt capacitance is assumed to be :

A) concentrated at the middle of the line 
B) concentrated at the sending end of the line 
C) distributed equally throughout the length 
D) concentrated at the receiving end of the line

Explanation: In Nomial-T model of transmission line, the whole shunt capacitance of line is assumed to be lumped at the middle of the line.