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accounting information systems

Questions and Answers of Accounting Information Systems

What are the systems development objectives?
What are the tasks required to complete the systems survey?
What is structured systems analysis?
What are the tasks required to complete a structured systems analysis?
Why do we study and document the current physical environment?
Compare and contrast tangible and intangible benefits.
What is the purpose of conducting an effectiveness analysis?
What is systems selection?
What does the approved configuration plan specify?
What are the reasons for using external versus internal sources of hardware?
What is a request for proposal (RFP)?
What are the approaches to obtaining an RFP?
Why might a company issue an RFP for general performance objectives?
What is the difference between a specification and a performance measure?
Describe the process used to evaluate vendor proposals.
What is structured systems design?
What is systems implementation?
What are the three major approaches to implementing an information system?
What is the riskiest approach to systems implementation?
What two variables should be considered when choosing a method to train employees to operate a new system?
What is the purpose of testing the entire system as opposed to testing part of the system?
Describe the major steps in a post-implementation review.
What are the three types of maintenance activities?
What skills do accountants have to contribute to the development/acquisition process?
What roles can an accountant play in the development or acquisition of an AIS?
“Choosing among renting, leasing, and purchasing an AIS is strictly a financial decision and should be done by the finance staff.” Do you agree?Discuss fully.
Find the \(z\)-transform of +1 (1) - x[n] =
Find the \(z\)-transform of the following sequence. x[n] = [3-1-(-3)"-]u[n]
Find the \(z\)-transform of 1 1-2 = n=0 +(-2)" z"
Find the \(z\)-transform of x[n] = = (1)" 10 [n 4]
Find the \(z\)-transform of (1) n=1 x[n] = =n+1 -n 2=n
Using convolution find \(y[n]\) given 1 ()", (3)", n h[n] y[n] =x[n] h[n] x[n] || || u[n]
Find the inverse \(z\)-transform of\[H[z]=\frac{4 z+1}{z-\frac{1}{4}}\]using power series expansion? (a) (b) ROC : |Z| > ROC : |Z| < 4
Find the \(z\)-transform of (a) (b) x[n] =10 n9 = 0 otherwise y[n] =x[n] - x[n 1]
Find the unilateral \(z\)-transform and the \(\mathrm{ROC}\) for the following sequences: (a) (b) (c) (..)" x[n] = 38[n+4] + 8[n] + (3)" u[-n] |n| u[n + 6] ()
By applying properties of \(z\)-transform find the \(z\)-transform of the following sequences given \(x[n] \stackrel{Z}{\longleftrightarrow} \frac{z}{\left(z^{2}+2ight)}\)(a) \(y[n]=x[n-3]\)(b)
Using partial function find the inverse \(z\)-transform H[z]= = (1-z-+z) (1-z-) (1 - 2z-) (1 - 4z-) ROC: 2 |z| < 4
Find the \(z\)-transform of the following sequence? x[n] (-:-) = (-1)" u[n] u[-n - 1]
Find the \(z\)-transform of(a) \(\quad x[n]=2^{n} u[n-2]\)(b) \(\quad x[n]=\left(\frac{1}{4}ight)^{n} u[-n]\)
Find the \(z\)-transform of(a) \(\quad x[n]=(n-4) u[n-4]\)(b) \(\quad x[n]=u[n]-u[n-4]\)(c) \(\quad x[n]=(n-4) u[n]\)(d) \(\quad x[n]=n[u[n]-u[n-4]]\)
Consider the algebraic expression for the \(z\)-transform of \(x[n]\)How many different ROCs could correspond the \(X[z]\) ? (1-z-) x[n] = (1 + z) (1 z + z)
Consider the algebraic expression for the zz-transform of x[n]x[n]ROC: \(|z|>\frac{1}{4}\). Find whether the system is causal and stable. x[1]= = (1+z+ 4z-) 7 (1-z-) (1-z- + 2-2) zzz-1+z-)
Consider the following T.F. of continuous-time system. Form the state space equation in canonical form II model. H (2) = 5s+68 +2s + 10 s3 +7s + 4s +5
A system with impulse response \(h[n]=5(3)^{n} u[n-1]\) produces on output \(y[n]=(-4)^{n} u[n-1]\).Determine the input \(x[n]\).
Consider the causal LTID system represented in block diagram shown in Fig. 5.19. (a) Determine the difference equation relating the output \(\boldsymbol{y}[\boldsymbol{n}]\) and input
Consider the following difference equation.\[y[n]-y[n-1]-2 y[n-2]=x[n]+2 x[n-1]\]The initial conditions are \(y[-1]=1\) and \(y[-2]=2\). The input \(x[n]=u[n]\). Find (a) Zero input response, (b)
Consider the electrical circuit shown in Fig. 6.22. Form the state space equation. + ww R = 10 ww ele R L=1H ww R=30 C=2F
Consider the mechanical system shown in Fig. 6.21. Form the state space equation. i (t) e (t) K 4 M, L, R f(t) = Kgi(t) b M2 K2gHB2
For each of the following difference equations determine the output response \(y[n]\) ?(a) \(y[n]-4 y[n-1]=x[n]\) with \(y[-1]=2\) and \(x[n]=\left(\frac{1}{3}ight)^{n} u[n]\)(b) \(y[n]+\frac{1}{3}
Define the state of a system?
Consider the following T.F. of a certain continuous-time system. Form the state space equations in canonical form I model. H(z) = 7s +8s +4 s3 +55 + 9s + 10
What do you understand by state vector?
What is state space?
What is state-space equations?
Consider the following T.F. of continuous-time system. Form the state space equation in diagonal form model. H(z) = (s +65 + 8) (s3+27s +230s + 600)
What is vector-matrix differential/difference equation?
What is Cayley-Hamilton theorem? p(A) = A - 24-34 + 6I - I = A - 5A +5I || || || 3 1 3 1 12 12 HI H 10 5 5 5 15 5 5 10 3 1 12 50 05 H ]-[:] 00 = 00 10 + [ 11 +5 01 10-15+5 5-5+0 5-5+0 5-10+5
What is state transition matrix STM?
Consider the following differential equation\[\frac{d^{3} y}{d t^{3}}-5 \frac{d^{2} y}{d t^{2}}+6 \frac{d y}{d t}+7 y=2 \frac{d x}{d t}+5 x(t)\]Form the state space equation in canonical form II
Consider the following T.F. of a certain discrete system given below. Form the state space equation of canonical form I model. H(z) = 2z + 6z +9 z + 8z +7z+ 16
Consider the following T.F. of a certain discrete-time system\[H(z)=\frac{4 z^{2}-5 z+10}{z^{3}+2 z^{2}-7 z+9}\]Form the state variable equation in canonical form II model.
What physical variables are chosen as state variables in electrical circuit and mechanical systems?
What are the advantages of state space model over that of transfer function model?
A certain discrete-time system is described by the following difference equation.\[\begin{aligned}& y[n]-\frac{1}{12} y[n-1]-\frac{1}{6} y[n-2]+\frac{1}{48} y[n-3] \\& \quad=x[n-1]-\frac{3}{8}
For a particular system, the \(\boldsymbol{A}\) matrix is represented in more than one form. What is the nature of characteristic equation?
Find the state equation of a continuous-time LTI system described by\[\ddot{y}(t)+3 \dot{y}(t)+2 y(t)=x(t)\]
How are signals classified?
What are odd and even signals?
How even and odd components of a signal are mathematically expressed for CT and DT signals?
What are periodic and non-periodic signals?
What is the fundamental period of a periodic signal? What is fundamental frequency?
What are power and energy signals?
What is the condition that the signal \(x(t)=e^{a t} u(t)\) to be energy signal?
Is the unit step signal an energy signal?
Determine the power and RMS value of the signal \(x(t)=e^{j a t} \cos \omega_{0} t\) ?
What is the periodicity of \(x(t)=e^{j 100 \pi t+30^{\circ}}\) ?
Find the equivalence of the following functions (a) \(\delta(a t)\); (b) \(\delta(-t)\); (c) \(t \delta(t)\);(d) \(\sin t \delta(t)\); (e) \(\cos \delta(t)\); (f) \(x(t)
How do you represent an everlasting exponential \(\boldsymbol{e}^{-a t}\) for \(\boldsymbol{t} \geq \mathbf{0}\) and \(\boldsymbol{t}
Find the value of \(\frac{t^{2}+5}{t^{2}+6} \delta(t-2)\).
Find the odd and even components of \(e^{j 2 t}\).
Define system. What is linear system?
What is time invariant and time varying system?
What are static and dynamic systems?
What are causal and non-causal systems?
What are stable and unstable systems?
What are invertible and non-invertible systems?
State the condition for a discrete-time LTI system to be causal and stable.
Check whether the system having the input-output relation\[y(t)=\int_{-\infty}^{t} x(\tau) d \tau\]is linear and time invariant.
Check whether the system classified by\[y(y)=e^{x(t)}\]is time invariant or not?
Determine whether the system described by the following input-output relationship is linear and causal.\[y(t)=x(-t)\]
Is the system \(y(t)=\cos t x(t-5)\) time invariant?
What do you understand by transient response of a system?
What are first- and second-order systems?
What is a standard second-order system equation?
What are the time domain specifications of a first-order system?
What are the time domain specifications of a second-order system?
How second-order system is identified according to the nature of damping?
How location of poles are identified in the \(s\)-plane according to the \(+v e\) damping?
What do you understand by negative damping?
What is damped frequency of oscillation of a second-order system?

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