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accounting information systems
Questions and Answers of
Accounting Information Systems
Why integrators are preferred to differentiators in structure realization?
What are the components required in structure realization?
Mention the steps to be followed to realize a transposed structure from canonic form structure.
Find the LT of \(x(t)=e^{-2|t|}\) and ROC.
Find the LT of \(x(t)=e^{2|t|}\) and ROC.
Find the LT of \(x(t)=\left(e^{2 t}+e^{-2 t}ight) u(t)\) and the ROC.
Find the LT of \(x(t)=\left(e^{2 t}+e^{-2 t}ight) u(-t)\) and the ROC.
Find the LT of \(x(t)=\left(e^{-6 t}+e^{-4 t}ight) u(t)+\left(e^{-3 t}+e^{-2 t}ight) u(-t)\)
Find the LT of\[x(t)=\left(e^{-6 t}+e^{-3 t}ight) u(t)+\left(e^{-4 t}+e^{-2 t}ight) u(-t)\]
Find the LT and ROC of\[x(t)=e^{-3 t}[u(t)-u(t-4)]\]
Find the inverse LT of the following \(X(s)\) for all possible combinations of ROC.\[X(s)=\frac{4}{(s+1)(s-3)}\]
Find the inverse LT of \(X(s)\) X (s) = 8(s + 2) s(s + 4s + 8) ROC: Re s> -2
Find the inverse LT of X (s) = s + 2s + 4) (s + 2) (s + 4) ROC: Res> -2
Find the inverse LT of X (s) = (s + 3s + 1) (s + 5s + 6) ROC: Re s> -2
Find the inverse \(\mathbf{L T}\) of X (s) = S +85 +21s + 16 (s + 7s +12) ROC: Re s> -3
Find the inverse LT of X (s) = 10se-2s +5e-4s +6 (s + 13s +40) ROC: Re s> -5
Find the initial and final value of \(y(t)\) if its \(\mathrm{LT} Y(s)\) is given by Y(s) = (s + 2s + 5) s (s + 4s + 6)
Using convolution property of LT find \(y(t)=x_{1}(t) * x_{2}(t)\)\[\begin{aligned}& x_{1}(t)=u(t) \\& x_{2}(t)=e^{-2 t} u(t)\end{aligned}\]
Consider an LTIC system described by the following differential equation\[\frac{d^{2} y(t)}{d t^{2}}+\frac{d y(t)}{d t}-6 y(t)=X(s)\]Determine(a) the system transfer function.(b) impulse response of
Determine the LT of the periodic signal shown in Fig. 4.53. 3 X(t) 2 1 1 I 4 6 8 10 t
Consider the electrical circuit shown in Fig. 4.54. Initially the switch \(S\) is closed. Derive an expression for the current through the inductor as soon as the switch is open. \(i(t)=\left[3 e^{-3
Find the Laplace inverse of the following \(\boldsymbol{X}(\boldsymbol{s})\) (Fig. 4.55): -2 jw 2 (a) ROC: Res > 2 Causal and unstable system -2 jw 0 2 (c) Non-causal and stable system -2 a jw (b)
Solve the following differential equation:\[\frac{d^{2} y(t)}{d t^{2}}+\frac{d y(t)}{d t}-2 y(t)=\frac{d x(t)}{d t}+x(t)\]The initial conditions are \(y\left(0^{-}ight)=2 ; \frac{d
The unit step response of a certain LTIC system \(y(t)=10 e^{-5 t}\). Find (a) The impulse response? (b) The response due to the exponential decay \(x(t)=e^{-3 t} u(t)\)?
The impulse response of a certain system is \(h_{1}(t)=e^{-3 t} u(t)\) and the impulse response of another system is \(h_{2}(t)=e^{-5 t} u(t)\). These two systems are connected in cascade. Find (a)
The impulse response of a certain system is given by \(h(t)=e^{-5 t}\). The system is excited by \(x(t)=e^{-3 t} u(t)+e^{-2 t} u(-t)\). Determine(a) The system transfer function(b) Output of the
A certain LTIC system is described by the following differential equation\[\frac{d^{2} y(t)}{d t^{2}}-\frac{d y(t)}{d t}-30 y(t)=\frac{d x(t)}{d t}+4 x(t)\]The system is subjected to the following
A certain LTIC system is described by the following differential equation:\[\frac{d^{2} y(t)}{d t^{2}}+3 \frac{d y(t)}{d t}+2 y(t)=\frac{d x(t)}{d t}+4 x(t)\]where \(x(t)=e^{-3 t} u(t)\). The initial
An LTIC system has the following T.F\[H(s)=\frac{(s+10)}{s^{3}+5 s^{2}+3 s+4}\]Determine the differential equation.
An LTIC system is described by the following differential equation\[\frac{d^{2} y(t)}{d t^{2}}+4 \frac{d y(t)}{d t}+3 y(t)=\frac{d x(t)}{d t}+4 x(t)\]The system is in the initial state of
The impulse response of an LTIC system is given by \(x(t)=e^{-2 t} u(t)\). Is the system causal?
The impulse response of an LTIC system is given by \(h(t)=\boldsymbol{e}^{-2|t|}\). Is the system causal.
Consider the following transfer function.\[X(s)=\frac{1}{(s+2)(s-2)}\]Identify all possible ROCs and in each case find the impulse response, stability, and causality. Also sketch the ROC. (1) ROC:
Find the bilateral LT of _a= (1) x -10|t|
Find the bilateral LT of x (t) = eu(t) e (1-)n,
Find the bilateral LT of X (s) = (s - 5) (s + 2)(s + 5) ROC: 5 < Res < -2
Find the inverse bilateral LT of X (s): = (s + 2) (s 2)(s - 5) - ROC: 2 Res
Find the inverse bilateral LT of X (s) = (s - 2s - 3) (s + 2) (s + 4) (s 6) - ROC: 2 < Res < 6 -
Define the \(z\)-transform.
Define \(z\)-transform pair.
What do you understand by ROC of \(z\)-transform?
Mention the properties of ROC.
What is the scaling property of \(z\)-transform?
What is the convolution property of \(z\)-transform?
What is difference property in the \(z\)-transform?
What are initial and final value theorems?
What do you understand by the time reversal property of \(z\)-transform?
What do you understand by the causality of an LTID system?
What do you understand by stability of an LTID system?
When the system is said to be both causal and stable?
Define system function.
What is the \(z\)-transform of \(\delta[n-2]\) ?
What is the \(z\)-transform of \(u[n]\) and \(\delta[n]\) ?
Find the \(z\)-transform of \(x[n]=u[n]-u[n-5]\).
Write the relationship between \(z\)-transform and Fourier transform.
Write the relationship between \(z\)-transform and Laplace transform.
What is the inverse \(z\)-transform of \(X\left[\frac{z}{a}ight]\) ?
Find the system function of the following first-order difference equation \(y[n]-2 y[n-1]=x[n]+x[n-1]\) ?
Which of the following is NOT a financial transaction?a. purchase of productsb. cash receiptsc. update valid vendor filed. sale of inventory
The following are subsystems of the accounting information system, EXCEPT thea. transaction processing systemb. human resources system.c. general ledger/financial reporting system.d. management
Which of the following is NOT a purpose of the transaction processing system?a. managing and reporting on the status of financial investmentsb. converting economic events into financial
The objectives of the data collection activity of the general model for accounting information systems are to collect data that area. relevant and redundantb. efficient and objective.c. efficient and
Which of the following is NOT a characteristic of effective information?a. relevanceb. accuracy c. summarizationd. precision
Which the following is NOT a database management taska. retrievalb. storage:c. summarizationd. deletion
When viewed from the highest to most elemental level, the data hierarchy isa. attribute, record, file.b. record, attribute, key.c. file, record, attribute.d. file, record, key.e. key, record, file.
Which is NOT a source of evidence for an external auditor?a. work performed by internal auditors who organizationally report to the controllerb. tests of controls c. substantive testsd. work
Which of the following is NOT an objective of all information systems?a. support for the stewardship function of managementb. support for management decision makingc. support for the day-to-day
Which of the following best describes the activities of the materials management function?a. purchasing, receiving, and inventory controlb. receiving, sales, distribution, and purchasingc. receiving,
Which of the following best describes the activities of the production function?a. maintenance, inventory control, and production planningb. production planning, quality control, manufacturing, and
Which of the following best describes the activities of the accounting function?a. inventory control, accounts payable, fixed assets, and payrollb. fixed assets, accounts payable, cash disbursements,
Which statement about cloud computing is most true?a. Cloud computing involves long-term contracts.b. Cloud computing is location-independent computing.c. Cloud computing involves an organization
What is the most likely system acquisition method—commercial software, custom software, or ERP—for each of the following situations? Explain your answers.• A heating and air-conditioning supply
What is the flat-file model?
Are both registers and special journals necessary? Discuss the relationship between the balance in the accounts payable general ledger control
account and what is found in the accounts payable subsidiary ledger.
The production subsystem of the conversion cycle Includes all of the following EXCEPTa. determining raw materials requirementsb. make or buy decisions on component parts.c. release of raw materials
Which of the following statements is NOT true?a. Sorting records that are coded alphabetically tends to be more difficult for users than sorting numeric sequences.b. Mnemonic codes are limited in
Which of the following is NOT an advantage of real-time processing of files over batch processing?a. shorter transaction processing timeb. reduction of inventory stocksc. improved customer service.d.
Which of the following statements is not correct?a. Database systems resolve task data dependencyb. The flat-file model encourages data redundancyc. A primary goal of database systems is to minimize
Which of the following is NOT true of a turn around document?a. They may reduce the number of errors made by external parties.b. They are commonly used by utility companies (gas, power, water).c.
Which of the following is NOT a true statement?a. Transactions are recorded on ledgers and are posted to journals.b. Transactions are recorded in journals and are posted to ledgers.c. Infrequent
Which of the following is true of the relationship between subsidiary ledgers and general ledger accounts?a. The two contain different and unrelated datab. The relationship between the two constitute
A documentation tool that depicts the physical flow of information relating to a particular trans action through an organization is a (n)a. ER diagram.b. program flowchartc. decision table..d. data
In a hashing structurea. two records can be stored at the same address.b. pointers are used to indicate the location of all records.c. pointers are used to indicate location of a record with the same
An advantage of a physical address pointer is thata. it points directly to the actual disk storage locationb. it is easily recovered if it is inadvertently lose.c. it remains unchanged when disks are
Which statement is NOT correct? The Virtual storage Access Methoda. is used for very large files that need both direct access and batch processingb. may use an overflow area for records.c. provides
Which statement is true about a hashing structure?a. The same address could be calculated for two different records.b. Storage space is used efficiently.c. Records cannot be accessed rapidly.d. A
Which statement is NOT correct?a. Indexed random files are dispersed throughout the storage device without regard for physical proximity with related records.b. Indexed random files use disk storage
What is ethics?
Explain the GFS backup technique. Is it used for sequential files or direct access techniques? Explain.
A control designed to validate a transaction at the point of data entry isa. recalculation of a batch totalb. a record countc. a check digit.d. checkpoints.e. recalculation of hash total.
Application controls are classified asa. input, processing, and output.b. input, processing, output, and storage.c. input, processing, output, and control.d. input, processing, output, storage, and
In an automated payroll processing environment, a department manager substituted the time card for a terminated employee with a time card for a fictitious employee. The fictitious employee had the
The underlying assumption of reasonable assurance regarding implementation of internal control means thata. auditors are reasonably assured that fraud has not occurred in the period.b. auditors are
Ensuring that all material transactions processed by the information system are valid and in accordance with management's objectives is an example ofa. transaction authorization.b. supervision.c.
Which of the following situations is NOT a segregation of duties violation?a. The treasurer has the authority to sign checks but gives the signature block to the assistant. treasurer to run the
Providing timely information about transactions in sufficient detail to permit proper classification and financial reporting is an example ofa. the control environment.b. risk assessment.c.
The fraud scheme that is similar to the concept of "borrowing from Peter to pay Paul" isa. expense account fraud.b. bribery.c. lappingd. transaction fraud.
Which of the following benefits is least likely to result from a system of internal controls?a. reduction of cost of an external auditb. prevention of employee collusion to commit fraudc.
Which of the following is the correct order of the steps in physical systems design?a. Input, file and database, output, controls, procedures, programb. File and database, output, input,
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