Mention the various types of buses in power system with specified quantities for each bus.

Mention the various types of buses in power system with  specified quantities for each bus.
by

1 Answer

Answer :

• Load bus or PQ-bus (P and Q are specified- Voltage  magnitude and angle are to be obtained)  
• Generator bus or voltage controlled bus or PV bus (P and V  are specified- Voltage angle and Q are to be obtained)
by

Related questions

Specified quantities of load bus are a) P and Q b) V and δ c) P and δ d) Q and V

Description : Specified quantities of load bus are a) P and Q b) V and δ c) P and δ d) Q and V

Last Answer : a) P and Q

For load flow studies, what are the quantities specified at load bus are. a) P and V b) P and Q c) V and δ d) δ and Q

Description : For load flow studies, what are the quantities specified at load bus are. a) P and V b) P and Q c) V and δ d) δ and Q

Last Answer : b) P and Q

In a load flow problem solved by newton-Raphson method with polar coordinates, the size of the Jactobian is 100 × 100. If there are 20 PV buses in addition to PQ buses and a slack bus, the total number of buses in the system is_____

Description : In a load flow problem solved by newton-Raphson method with polar coordinates, the size of the Jactobian is 100 × 100. If there are 20 PV buses in addition to PQ buses and a slack bus, the total number of buses in the system is_____

Last Answer : 61

What are the four quantities that are associated with each bus in a system?

Description : What are the four quantities that are associated with each bus in a system?

Last Answer : • Real Power • Reactive Power • Voltage magnitude • Phase angle of voltage

In load flow studies of a power system, a voltage control bus is specified by a) Real power and reactive power b) Reactive power and voltage magnitude c) Voltage and voltage phase angle d) Real power and voltage magnitude

Description : In load flow studies of a power system, a voltage control bus is specified by a) Real power and reactive power b) Reactive power and voltage magnitude c) Voltage and voltage phase angle d) Real power and voltage magnitude

Last Answer : d) Real power and voltage magnitude

Which of the following quantities are to be calculated for generator bus a) P and V b) V and δ c) δ and Q d) Q and P

Description : Which of the following quantities are to be calculated for generator bus a) P and V b) V and δ c) δ and Q d) Q and P

Last Answer : c) δ and Q

A power system has 100 buses including 10 generator buses. For the load flow analysis using Newton-Raphson method in polar coordinates, the size of the Jacobian is a) 189x189 b) 100x100 c) 90x90 d) 180x180

Description : A power system has 100 buses including 10 generator buses. For the load flow analysis using Newton-Raphson method in polar coordinates, the size of the Jacobian is a) 189x189 b) 100x100 c) 90x90 d) 180x180

Last Answer : a) 189x189

In power system, the maximum number of buses are a) Generator buses b) Load buses c) Slack buses d) P-V buses

Description : In power system, the maximum number of buses are a) Generator buses b) Load buses c) Slack buses d) P-V buses

Last Answer : b) Load buses

A network containing 50 buses in which 10 are the voltage control buses, 6 are the generator buses. Find the size of the Jacobian matrix. a) 84*84 b) 83*83 c) 34*34 d) 33*33

Description : A network containing 50 buses in which 10 are the voltage control buses, 6 are the generator buses. Find the size of the Jacobian matrix. a) 84*84 b) 83*83 c) 34*34 d) 33*33

Last Answer : b) 83*83

A 1000 × 1000 bus admittance matrix for an electric power system has 8000 non-zero elements. The minimum number of branches (transmission lines and transformers) in this system are _____ (up to 2 decimal places)

Description : A 1000 × 1000 bus admittance matrix for an electric power system has 8000 non-zero elements. The minimum number of branches (transmission lines and transformers) in this system are _____ (up to 2 decimal places)

Last Answer : Ans: 3500.00

In a load flow analysis of a power system, the load connected at a bus is represented as a) Constant current drawn from the bus b) Constant impedance connected at the bus c) Voltage and frequency dependent sources at the boss d) Constant real and reactive power drawn from the bus

Description : In a load flow analysis of a power system, the load connected at a bus is represented as a) Constant current drawn from the bus b) Constant impedance connected at the bus c) Voltage and frequency dependent sources at the boss d) Constant real and reactive power drawn from the bus

Last Answer : d) Constant real and reactive power drawn from the bus

In power system, if a voltage controlled bus is treated as a load bus then which one of the following limits would be violated? a) Voltage b) Active power c) reactive power d) Phase angle

Description : In power system, if a voltage controlled bus is treated as a load bus then which one of the following limits would be violated? a) Voltage b) Active power c) reactive power d) Phase angle

Last Answer : a) Voltage

A 4 bus power system consists of 4 transmission lines, then find the sparsity of Y bus matrix? a) 0.75 b) 0.25 c) 0.4 d) 0.5

Description : A 4 bus power system consists of 4 transmission lines, then find the sparsity of Y bus matrix? a) 0.75 b) 0.25 c) 0.4 d) 0.5

Last Answer : b) 0.25

For n bus power system size of Y bus matrix is a) n*n b) (n-1)*(n-1) c) (n-1)*(n-2) d) (n-2)*(n-2)

Description : For n bus power system size of Y bus matrix is a) n*n b) (n-1)*(n-1) c) (n-1)*(n-2) d) (n-2)*(n-2)

Last Answer : a) n*n

What is the need for slack bus in power flow analysis.

Description : What is the need for slack bus in power flow analysis.

Last Answer : The slack/swing bus is needed to account for transmission line losses. In a power system the total power generated will be equal to sum of power consumed by loads and losses. In a power ... power are not specified for slack bus. They are estimated through the solution of load flow equations.

The voltage of a particular bus can be controlled by controlling the a) Active power of the bus b) Reactive power of the bus c) Phase angle d) All of the above

Description : The voltage of a particular bus can be controlled by controlling the a) Active power of the bus b) Reactive power of the bus c) Phase angle d) All of the above

Last Answer : b) Reactive power of the bus

Define voltage-controlled bus and load bus.

Description : Define voltage-controlled bus and load bus.

Last Answer : LOAD BUS A bus is called PQ bus or load bus when real and reactive components of power are specified for the bus. In a load bus the voltage is allowed to vary within permissible limits ... constant using automatic voltage regulator, we can specify constant PGi and | Vi | for these buses.

What technique is used to solve load flow problems using Z-bus (Bus impedance matrix)?

Description : What technique is used to solve load flow problems using Z-bus (Bus impedance matrix)?

Last Answer : The formulation of load flow problem using Zbus employs Diakoptics techniques which is actually the piecewise solution of the power system problem by using tearing off technique.

When will the generator bus is treated as load bus.

Description : When will the generator bus is treated as load bus.

Last Answer : If the reactive power of a generator bus violates the specified limits then the generator bus is treated as load bus.

In a 4 bus,4×4 Y bus matrix the number of non zero elements are 12. Find the number of transmission lines? a) 8 b) 4 c) 2 d) 5

Description : In a 4 bus,4×4 Y bus matrix the number of non zero elements are 12. Find the number of transmission lines? a) 8 b) 4 c) 2 d) 5

Last Answer : b) 4

The value of off diagonal elements is a) sum of admittances connected at bus j b) which is connected between bus i and bus j with positive sign c) which is connected between bus i and bus j with negative sign d) sum of admittances connected at bus i

Description : The value of off diagonal elements is a) sum of admittances connected at bus j b) which is connected between bus i and bus j with positive sign c) which is connected between bus i and bus j with negative sign d) sum of admittances connected at bus i

Last Answer : c) which is connected between bus i and bus j with negative sign

If sparsity of a 5 bus transmission line is 0.4. Find the number of transmission lines? a) 6 b) 5 c) 4 d) 3

Description : If sparsity of a 5 bus transmission line is 0.4. Find the number of transmission lines? a) 6 b) 5 c) 4 d) 3

Last Answer : b) 5

um of the elements of row i equal to shunt admittances connected to bus i. If this summation is zero, indicates there is no a) shunt admittance b) mutual coupling c) both 1 and 2 d) none of the above

Description : um of the elements of row i equal to shunt admittances connected to bus i. If this summation is zero, indicates there is no a) shunt admittance b) mutual coupling c) both 1 and 2 d) none of the above

Last Answer : c) both 1 and 2

Which of the following matrix is used for load flow studies? a) null matrix b) Unit matrix c) Z bus matrix d) Y bus matrix

Description : Which of the following matrix is used for load flow studies? a) null matrix b) Unit matrix c) Z bus matrix d) Y bus matrix

Last Answer : d) Y bus matrix

Normally Z bus matrix is a a) null matrix b) sparse matrix c) full matrix d) unit matrix

Description : Normally Z bus matrix is a a) null matrix b) sparse matrix c) full matrix d) unit matrix

Last Answer : full matrix

Mention any three advantages of N-R method over G-S method.

Description : Mention any three advantages of N-R method over G-S method.

Last Answer : • The N-R method has quadratic convergence characteristic and so convergence faster than G-S method. • The number of iterations for convergence is independent of the size of the system in N-R method. • In N-R method the convergence is not affected by the choice of slack bus.

Advantage of Gauss-Seidel method is a) applicable for large power system network b) calculation time for each iteration is less c) number of iterations are less d) all of the above

Description : Advantage of Gauss-Seidel method is a) applicable for large power system network b) calculation time for each iteration is less c) number of iterations are less d) all of the above

Last Answer : b) calculation time for each iteration is less

Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]. Assertion: Fast decoupled load flow method gives approximate load flow solution because it uses several assumptions. Reason: Accuracy depends on the power mismatch vector tolerance. a) Both [a] and [r] are true and [r] is the correct reason for [a]. b) Both [a] and [r] are true and [r] is not the correct reason for [a]. c) [a] is false and [r] is true.

Description : Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]. Assertion: Fast decoupled load flow method gives approximate load flow solution because it uses several assumptions. Reason: Accuracy ... the correct reason for [a]. c) [a] is false and [r] is true.

Last Answer : c) [a] is false and [r] is true

or accurate load flow calculations on large power systems, the best method is a) N-R method b) G-S method c) Decoupled method d) all of the above

Description : or accurate load flow calculations on large power systems, the best method is a) N-R method b) G-S method c) Decoupled method d) all of the above

Last Answer : a) N-R method

Explain Flat Voltage start.

Description : Explain Flat Voltage start.

Last Answer : In iterative methods of load flow solution, the initial voltages of all buses except slack bus are assumed as 1+j0 p.u. This is referred to as flat voltage start.

What are the advantages of FDLF method.

Description : What are the advantages of FDLF method.

Last Answer : FDLF method is faster, simple to program, more reliable and requires less memory than NR load flow method. FDLF method requires more iteration than N-R method, but requires less time per iteration.

What is jacobian matrix?

Description : What is jacobian matrix?

Last Answer : The Jacobian matrix gives the linearized relationship between small changes in voltage angle or voltage magnitude with a small changes in real and reactive power.

What are the disadvantages of NR method.

Description : What are the disadvantages of NR method.

Last Answer : • The programming is more complex. • The memory requirement is more. • Computational time per iteration is higher due to large number of calculations per iteration.

Discuss the effect of acceleration factor in the load flow solution algorithm.

Description : Discuss the effect of acceleration factor in the load flow solution algorithm.

Last Answer : An acceleration factor is a value that can be used to speed up the convergence and reduce the number of required alteration in a Gauss Seidel method of power flow analysis .Very high or very ... trial and error load flow analysis. A generally recommended value of the acceleration factor is 1.6.

What is the need for load flow analysis.

Description : What is the need for load flow analysis.

Last Answer : The load flow study of a power system is essential to decide the best operation of existing system and for planning the future expansion of the system. It is also essential for designing a new power system.

What is the information that are obtained from a load flow study.

Description : What is the information that are obtained from a load flow study.

Last Answer : • The magnitude and phase of bus voltages, real and reactive power flowing in each line and the line losses. • The load flow solution also gives the initial conditions of the system when the transient behavior of the system is to be studied.

For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is

Description : For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is

Last Answer : For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is 25 x 25

There are 312, 260 and 156 students in class X, XI and XII respectively. Buses are to be hired to take these students to a picnic. Find the maximum number of students who can sit in a bus if each bus takes equal number of students (a) 52 (b) 56 (c) 48 (d) 63

Description : There are 312, 260 and 156 students in class X, XI and XII respectively. Buses are to be hired to take these students to a picnic. Find the maximum number of students who can sit in a bus if each bus takes equal number of students (a) 52 (b) 56 (c) 48 (d) 63

Last Answer : (a) 52

A transport company is running five buses between two towns, which are 50 kms apart. Seating capacity of each bus is 50 passengers. Actually passengers carried by each bus were 75% of seating capacity. All buses ran on all days of the month. Each bus made one round trip per day. Passenger kms are: (a) 2,81,250 (b) 1,87,500 (c) 5,62,500 (d) None of the above

Description : A transport company is running five buses between two towns, which are 50 kms apart. Seating capacity of each bus is 50 passengers. Actually passengers carried by each bus were 75% of seating capacity. All buses ran on all days of ... (a) 2,81,250 (b) 1,87,500 (c) 5,62,500 (d) None of the above

Last Answer : (c) 5,62,500

Which of the following buses available on computer system: a) Address Bus b) Data Bus c) System Bus d) All of Above e) None of These

Description : Which of the following buses available on computer system: a) Address Bus b) Data Bus c) System Bus d) All of Above e) None of These

Last Answer : d) All of Above

What are the quantities associated with each bus ina system?

Description : What are the quantities associated with each bus ina system?

Last Answer : Each bus in a power system is associated with four quantities and they are real power, reactive power, magnitude of voltage, and phase angle of voltage.

A bus disconnect link is used to isolate _____________. A. one bus bar from another B. the generator circuit breaker from the bus C. different phases from the equalizer connection D. positive and negative buses from the neutral

Description : A bus disconnect link is used to isolate _____________. A. one bus bar from another B. the generator circuit breaker from the bus C. different phases from the equalizer connection D. positive and negative buses from the neutral

Last Answer : Answer: B

When the generator buses are treated as load bus.

Description : When the generator buses are treated as load bus.

Last Answer : If the reactive power constraints of a generator bus violates the specified limits then the generator is treated as load bus.

Busses start from a bus terminal with a speed of 20 km/hr at intervals of 10 minutes. What is the speed of a man coming from the opposite direction towards the bus terminal if he meets the buses at intervals of 8 minutes? a) 3 km/hr b) 4 km/hr c) 5 km/hr d) 7 km/hr e) None of these

Description : Busses start from a bus terminal with a speed of 20 km/hr at intervals of 10 minutes. What is the speed of a man coming from the opposite direction towards the bus terminal if he meets the buses at intervals of 8 minutes? a) 3 km/hr b) 4 km/hr c) 5 km/hr d) 7 km/hr e) None of these

Last Answer : Distance covered in 10 minutes at 20 kmph = distance covered in 8 minutes at (20+x) kmph 20× 10/60=8/60(20+x) 200 = 160 + 8x 8x = 40 x=40/8=5 kmph Answer: c)

25 buses are running between two places P and Q. In how many ways can a person go from P to Q and return by a different bus? a) 300 b) 625 c) 600 d) 650

Description : 25 buses are running between two places P and Q. In how many ways can a person go from P to Q and return by a different bus? a) 300 b) 625 c) 600 d) 650

Last Answer : c) 600

In 2003, the people preferring to travel by bus represented approximately what per cent of the people preferring to travel by own vehicles, buses and rails together in the year? a) 46 b) 54 c) 22 d) 14 e) 37

Description : In 2003, the people preferring to travel by bus represented approximately what per cent of the people preferring to travel by own vehicles, buses and rails together in the year? a) 46 b) 54 c) 22 d) 14 e) 37

Last Answer : e) 37

In the year 2003, if all the buses reduced their rates by 40% and 50% of the people who preferred to travel by rail, now preferred buses, then how many people (in thousands) prefer to travel by bus? a) 1750 b) 1569 c) 1458 d) 1675 e) None of these

Description : In the year 2003, if all the buses reduced their rates by 40% and 50% of the people who preferred to travel by rail, now preferred buses, then how many people (in thousands) prefer to travel by bus? a) 1750 b) 1569 c) 1458 d) 1675 e) None of these

Last Answer : d) 1675

Define the term BUS related to microprocessor/controller and list different buses used in microcontroller.

Description : Define the term BUS related to microprocessor/controller and list different buses used in microcontroller.

Last Answer : BUS: A Bus is a set of physical connections used for communication between CPU and peripherals. Different buses used in microcontroller are: 1. Address Bus 2. Data Bus 3. Control Bus

A temporary price reduction to resellers for purchasing specified quantities of a product is: A)premium money B)a merchandise allowance C)a buying allowance D)a buy -back allowance E)a money refund

Description : A temporary price reduction to resellers for purchasing specified quantities of a product is: A)premium money B)a merchandise allowance C)a buying allowance D)a buy -back allowance E)a money refund

Last Answer : A)premium money