R& V Hotel is consistently incurring losses for the past 2 years though the sales clerk receives customer orders, raises sales invoices at a higher price and processes payments for customers. Hotel customers have contracted prices, however online trade prices automatically loaded in to the system but the Brenda clerk used to amend manually. Mr. Zakariya an internal auditor found some deficiencies, who has taken some necessary actions to cross check those invoices and employees responsibilities and suggested the management immediately to prevent from loss of customers and good will of the hotel.
Based on the above scenario:
1. How the internal audit for R and V hotel can be helpful in resolving the issues they are confronting at the moment? Justify your answer practically
2. If you were Mr. Zakariya, prepare doable audit plan that Mr. Zakariya that you can use for the company and provide recommendations on how to overcome the deficiencies cited in the case?

The cell potential of a redox reaction occurring in an electrochemical cell under any set of temperature and concentration conditions can be determined from the standard cell potential of the cell using the Nernst equation E = E° − RT nF ln Q where E is the cell potential of the cell, E° is the standard cell potential of the cell, R is the gas constant, T is the temperature in kelvin, n is the moles of electrons transferred in the reaction, and Q is the reaction quotient. Use this relationship to answer the problem below.

For the following oxidation-reduction reaction Cu2+(aq) + Ni(s) → Cu(s) + Ni2+(aq) the standard cell potential is 0.60 V. What is the actual cell potential of the cell if the temperature is 314 K, the initial Cu2+ concentration is 0.00107 M, and the initial Ni2+ concentration is 0.0183 M? (Note that the reaction involves the transfer of 2 moles of electrons, and the reaction quotient is 17.1.)

_______________ V

Suppose you have a concentrated solution (S1) with a concentration equal to 1 M. You use their solution to make more dilute solutions S2-S6. Complete the following table, which describes the solution process. NOTE: Not all of the solutions are diluted S1; some are made from solutions that are derived from S1. The equation C₁V₁ = C₂V₂ should be used as a starting point for calculation. You can assume all volumes are additive. S2 is shown as an example.

Consider a Carnot-cycle heat pump with R-410a as the working fluid. Heat is rejected from the R410a at 35 oC, during which process the R-410a changes from saturated vapor to saturated liquid. The heat is transferred to the R-410a at 0 oC. The specific volume during the isothermal heat addition process at 0 oC changes from 0.00841 m3 /kg to 0.02994 m3 /kg.

a. Show the cycle on P-T, P-v, and T-v diagrams.

b. Find the quality at the beginning and at the end of the isothermal heat addition process at 0 oC.

c. Find the pressure and specific volume at the four points.

d. Find the specific heat and specific work at each process.

e. Find the net specific heat and the net specific work during the cycle.

f. Determine the COP of the cycle using heat and work.

g. Determine the COP of the cycle using temperatures.

The parameters of a 3-phase, 4-pole, 50 Hz, Y-connected, wound-rotor induction motor are listed below. These are the default values of the “Asynchronous Machine” model in MATLAB Simulink. r1=0.5968 ?; r2=0.6258 ?; L1=0.0003495 H; L2=0.005473 H; Lm=0.0354 H; Stator line voltage = 400 V rms. The motor for rotor speeds nm= 0 to 1500 rpm.

X1= 0.1097 ohm, X2= 1.719 ohm , Xm= 11.12 ohm, RTH = 0.5853 , XTH = 0.1395 and VTH = 230.82 V.

Suppose the motor is to rotate a fan for which the load torque is proportional to cube of the speed: ?m = (1.3×10^ -5 )*?m^3 where ?m is the fan speed in rad/s. Then use MATLAB to plot the torque-speed characteristic of the fan as the motor torque-speed characteristic. What would be the motor speed and torque?

*************** Please do not copy and paste from other answered questions on Chegg, *******************

QUESTION 2

The following reactions in certain anaerobic soils control the solubility of Fe2+ and Mn2+ in soil solutions:

γ-MnOOH(s) + 3H+(aq) + e- = Mn2+(aq) + 2H2O E0 = 1.457 V Fe(OH)3(s) + 3H+(aq) + e- = Fe2+(aq) + 3H2O E0 = 1.057 V

(A) Which mineral is the stronger oxidant, γ-MnOOH or Fe(OH)3?

(B) Define the redox equilibrium between γ-MnOOH(s) and Fe2+(aq) using the two half

reactions defined above. In a soil that is at equilibrium with this reaction, what is the concentration of Fe2+(aq) when the concentration of Mn2+ is 10-5 M?

(C) Calculate the Eh and pe of this soil if the pH is 7 and the Mn2+ activity is 10-5M.
(D) If molecular oxygen were introduced into this anaerobic soil system, what would be the

likely sequence of chemical processes with respect to the above reactions?

Sandra drives a bus with a wheelbase of 2.6 meters. The center of gravity is in center of the bus, 1.2 meters above the ground. You can treat the bus as if all of its mass was at its center of mass. Sandra turns right on flat ground. The center of mass has a turning radius of 47 meters. The bus moves at a constant speed V, and has a mass M. a) What is the acceleration of the bus? b) What is the total normal force on the bus? What is the frictional force? c) What is the torque on the bus about its center of mass from the force of friction? d) If all of the normal force comes from the left wheels, what is the torque on the bus about its center of mass from the wheels? e) At what speed V would these two torques be equal? f) What should Keanu do if he wants to make the turn at a slightly higher speed?

Fundamental of power electronics:

In a certain application, an unregulated dc input voltage can vary between 18 and 36 V. It is desired to produce a regulated output of 28 V to supply a 2 A load. control circuit automatically adjust D to maintain the constant output voltage and current. All ideal components.  Hence, a converter is needed that is capable of both increasing and decreasing the voltage. Since the input and output voltages are both positive, converters that invert the voltage polarity (such as the basic buck-boost converter) are not suited for this application.

(1) Sketch the waveforms of the transistor voltage Vds and transistor current IT or (Id for drain current) and give expressions for their peak values. find the numerical maximum value on the sketch for Vds and IT (Id). ignore the effect ripple.

(2) Derive the expression for switching frequency at the converter operates between the CCM and DCM at the boundary. the answer is in term of D, Vin, L1, L2, iL1, iL2. you may assume L1=L2.

A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ half-cell at 25 ∘C. The initial concentrations of Pb2+ and Cu2+ are 0.0500 M and 1.50 M , respectively.

Standard Reduction Half-Cell Potentials at 25 ∘C Half-Reaction E∘(V)

Cu+(aq)+e−→Cu(s) 0.52

Cu2+(aq)+2e−→Cu(s) 0.34

Cu2+(aq)+e−→Cu+(aq) 0.16

Pb2+(aq)+2e−→Pb(s) −0.13

1. What is the initial cell potential? Express your answer using two decimal places.

2. What is the cell potential when the concentration of Cu2+ falls to 0.200 M ? Express your answer using two decimal places.

3. What are the concentrations of Pb2+ and Cu2+ when the cell potential falls to 0.37 V ? Enter your answers numerically separated by a comma. Express your answer using two significant figures.