2.1 Why are load flow studies carried out?

c. For planning the power system

a. To study of stability of the system

2.4 Which among the following is the main assumption to solve a load flow problem by GS method?[NPTEL]

c . All the buses are to be considered as PQ bus excluding the slack bus.

a. All the buses are to be considered as PQ bus including the slack bus.

b. All the buses are to be considered as PV bus including the slack bus.

d. All the buses are to be considered as PV bus excluding the slack bus.

2.5 In load flow studies PV bus is treated as PQ bus when

c. Reactive power goes beyond limit

b.Voltage at the bus become high

2.8 ( 2 marks ) In load flow analysis, the load connected at a bus is represented as[GATE]

d. Constant real and reactive power drawn from the bus.

a. Constant current drawn from the Bus

b. Constant impedance connected at the bus

c. Voltage and frequency dependent source at the bus

3.1 Which among these is the most severe fault?

a. Single line to ground fault.

3.4 What is the rated breaking capacity of the circuit breaker?

b. The product of rated voltage and rated symmetrical breaking current

a. The product of rated voltage and rated breaking current

c. The product of fault voltage and breaking current

3.5 A balanced three phase system consists of _________.

b. Positive sequence currents only

c. Positive, negative and zero sequence currents

d. Only negative sequence currents

3.7 (2 marks) In the manufacture of transformers, ANSI prescribes certain standards. What is this standard?

a. High voltage side should lead the low voltage side by 30° with Y - Δ or Y - Δ connections.

b. High voltage side should lead the low voltage side by 60° with Y - Δ or Y - Δ connections.

c. High voltage side should lag the low voltage side by 30° with Y - Δ or Y - Δ connections.

d. High voltage side should lag the low voltage side by 60° with Y - Δ or Y - Δ connections

3.8 (2 marks ) What is the expression for the symmetrical short circuit current? If the total short circuit current consists of two parts namely symmetrical short circuit current and DC offset current.

b. (V m / Z) * sin (ωt + α - θ)

a. (V m / Z) * sin (ω + αt - θ)

c. (V m * Z) * sin (ωt + αt - θ)

d. (V / Z m ) * sin (ωt + α - θ)

3.9 (2 marks ) Why are series reactors used?

c. To bring down the fault level with in the capacity of the switch gear instrument

a. Improve the transmission efficiency

b. Improve the power factor of the power system

4.5 What is the expression for fault current in line to line fault?

c. I f = √3 * (E a / Z 1 + Z 2 + Z 0 )

a. I f = √3 * (E a / Z 1 + Z 2 )

b. I f = 3 * (E a / Z 1 + Z 2 )

d. I f = 3 * (E a / Z 1 + Z 2 + Z 0 )

4.6 How are the zero sequence and negative sequence networks connected in case of LLG faults?

c. Can be connected in either way

d. Such type of connection does not exist

5.1 What is steady state stability limit?

a. The maximum flow of power through a particular point in the power system without loss of stability small disturbances occur.

b. The maximum power flow possible through a particular component connected in the power system. .

c. The maximum flow of power through a particular point in the power system without loss of stability when sudden disturbances occur

5.3 Equal area criterion is applicable to:

a. Single machine connected to infinite bus

b. Two machines connected to infinite bus

c.Multi machine system connected to infinite bus

5.4 The quantity H in swing equation is:

b.Motion of synchronous motor/3.55

5.6 What is / are the major assumptions made in the calculation of swing equations?

a. Damper winding are neglected

c. The machine has to run at synchronous speed

5.8 ( 2 marks) Swing equation which describes the relative motion of the rotor of the machine, is a

b) non linear and second-order differential equation

a) linear and second-order differential equation

c) non linear and first-order differential equation

d) non linear and hyperbolic equation

5.9 (2 marks) A variation in the power transfer had been observed at the generating station while power exchange process due to ______ and is known as ______

a) Swing of the machine, inertial response

c) sub synchronism, inertial response

d) swing of the machine, falling out of the rotor

EE8501 POWER SYSTEM ANALYSIS MODEL EXAM NOV 2020

Authored by A MOHANASUNDARAM

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University

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EE8501 POWER SYSTEM ANALYSIS MODEL EXAM NOV 2020

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

1.1 What is the per unit system (PU)?

a) A ratio of actual value in any units to the base or reference value in the same units

b) A ratio of the base or reference value in any units to the actual value in the same units.

c) Ratio of the square of the actual value in any units to the square of base or the reference value in the same units

d) All of these

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

1.2 Which among these is the major advantage of per unit computations?

a. Per unit impedance of transformers is the same referred to either side of it.

b. For simulating steady state and transient models in the computer this method is very useful.

c. Manufactures usually specify the impedance of an apparatus in per unit system.

d.all of these

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

1.3 Single line diagram does not represents:

a) Star connection of transformer winding

b) Delta connection of transformer winding

c) Neutral wire of transmission lines

d) Ratings of machines

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

1.4 What is the main purpose of reactance diagram?

a) Load flow analysis

b) Fault analysis

c) Calculation of ratings of Alternators

d) Calculation of ratings of Transformers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

1.5 For n bus power system size of Y bus matrix is

a) (n-1) × (n-1)

b) (n-2)×(n-2)

c) n×n

d) (n-1)× (n-2)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

1.6 What is the formula to calculate the (kV)_B on the HT section?

a. (kV)_B on HT section * (HT voltage rating) / (LT voltage rating)

b. (kV)_B on LT section * (HT voltage rating) / (LT voltage rating)

c. (kV)_B on HT section * (LT voltage rating) / (HT voltage rating)

d. (kV)_B on LT section * (LT voltage rating) / (HT voltage rating)

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

1.7 (2 marks) What will be the per unit impedance of a synchronous motor having a rating of 100 kVA, 13.2 kV and having a reactance of 75 Ω / ph?

a. 0.043 pu

b. 0.057 pu

c. 0.036 pu

d. 0.298 pu

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EE8501 POWER SYSTEM ANALYSIS MODEL EXAM NOV 2020

1.1 What is the per unit system (PU)?

1.2 Which among these is the major advantage of per unit computations?

1.3 Single line diagram does not represents:

1.4 What is the main purpose of reactance diagram?

1.5 For n bus power system size of Y bus matrix is

1.6 What is the formula to calculate the (kV)_B on the HT section?

1.7 (2 marks) What will be the per unit impedance of a synchronous motor having a rating of 100 kVA, 13.2 kV and having a reactance of 75 Ω / ph?

1.8 (2 marks ) If sparsity of a 5 bus transmission line is 0.4. Find the number of transmission lines?

1.9 ( 2 marks) The per unit value of a 2 ohm resistor at 100 MVA and 10 kV base voltage is

2.1 Why are load flow studies carried out?

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EE8501 POWER SYSTEM ANALYSIS MODEL EXAM NOV 2020

1.1 What is the per unit system (PU)?

1.2 Which among these is the major advantage of per unit computations?

1.3 Single line diagram does not represents:

1.4 What is the main purpose of reactance diagram?

1.5 For n bus power system size of Y bus matrix is

1.6 What is the formula to calculate the (kV)B on the HT section?

1.7 (2 marks) What will be the per unit impedance of a synchronous motor having a rating of 100 kVA, 13.2 kV and having a reactance of 75 Ω / ph?

1.8 (2 marks ) If sparsity of a 5 bus transmission line is 0.4. Find the number of transmission lines?

1.9 ( 2 marks) The per unit value of a 2 ohm resistor at 100 MVA and 10 kV base voltage is

2.1 Why are load flow studies carried out?

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1.6 What is the formula to calculate the (kV)_B on the HT section?