Power Systems - Online Test

Q1. . Consider a three-core, three-phase, 50Hz, 11kV cable whose conductors are denoted as R, Y and B in the figure. The inter-phase capacitance (C1) between each pair of conductors is 0.2µF and the capacitance between each line conductor and the sheath is 0.4.µF. The per-phase charging current is 

Answer : Option A
Explaination / Solution:
No Explaination.


Q2. For the power system shown in the figure below, the specifications of the components are the following:
G1 : 25 kV, 100 MVA, X = 9% 
G2: 25 kV, 100 MVA, X = 9% 
T1: 25 kV/220 kV, 90 MVA, X = 12% 
T2: 220 kV/25 kV, 90 MVA, X = 12% 
Line 1: 220 kV, X = 150 ohms
Choose 25kV as the base voltage at the generator G1, and 200 MVA as the MVA base. The impedance diagram is 
Answer : Option B
Explaination / Solution:
No Explaination.


Q3. Out of the following plant categories (i) Nuclear (ii) Run-of-river (iii) Pump Storage (iv) Diesel The base load power plants are
Answer : Option C
Explaination / Solution:
No Explaination.


Q4. For a fixed value of complex power flow in a transmission line having a sending end voltage V, the real power loss will be proportional to
Answer : Option C
Explaination / Solution:



Q5. How many 200W/220V incandescent lamps connected in series would consume the same total power as a single 100W/220V incandescent lamp?
Answer : Option D
Explaination / Solution:
No Explaination.


Q6. For the Y-bus matrix of a 4-bus system given in per unit, the buses having shunt elements are.

Answer : Option C
Explaination / Solution:
No Explaination.


Q7. Match the items in List-I with the items in List-II and select the correct answer using the codes given below the lists. List-I List-II A. Improve power factor 1. Shunt reactor B. Reduce the current ripples 2. Shunt capacitor C. Increase the power flow in line 3. Series capacitor D. Reduce the ferranti effect 4. Series reactor Codes:
Answer : Option B
Explaination / Solution:
No Explaination.


Q8. Match the items in List-I with the items in List-II and select the correct answer using the codes given below the lists. List I List II a. Short Line 1. Ohm Relay b. Medium Line 2. Reactance Relay c. Long Line 3. Mho Relay
Answer : Option C
Explaination / Solution:
No Explaination.


Q9. An independent voltage source in series with an impedance Zs = Rs + jXs delivers a maximum average power to a load impedance ZL when
Answer : Option D
Explaination / Solution:

According to maximum Power Transform Theorem
ZLZ= (Rs - jXs)