8th Semester Mechanical Engineering (June/July-2015) Question Papers

1. CEMTRAL
L!tsRAfrY
USN 1OME/PM81
Eighth Semester B.E. Degree Examination, June/July 20Ls
Operations Management
Time: 3 hrs. Max. Marks:1OO
Note: Answer any FIVE full questions, selecting
atleast TWO questions from each part.
PART _ A
a. Explain 'scientific Management' and its origin. (05 Marks)
b. What is 'Operations Management? (05 Marks)
c. What is 'Productivity'? Mention how it can be improved. (05 Marks)
d. Suppose a company produced 300 standard book cases last week using 8 workers and it
produced 240 standard book cases this week using 6 workers. In which week was
productivity higher? (05 Marks)
Explain what 'Uncertainty' is and how this can be overcome in operations management.
(08 Marks)
Explain 'Bayes Theorem' with notations. A study of old buses shows the probability of an
accident by over speeding is 0.8, and the probability of over speeding alone is 0.3. The
probability of an accident occurring due to non overspeeding reduces to 0.1. Recently an
accident occurred. What is the probability that the bus was overspeeding? (06 Marks)
Maximize3xt + 5x2, given Xr * Zxz> 2000, Xr * x2)_1500, xz > 600 by graphical method.
(06 Marks)
a. Explain the 'Moving Average' and 'simple Exponential Smoothing' methods of forecasting.
(08 Marks)
b. Explain'Linear Regression'method for trend analysis by least squares. Explain any
simplification possible. (06 Marks)
c. The data given below refers to past sales for last eleven years. Using least squares estimate
sales forecast for the next two years. Also use 'Moving Average' for 3 years and compare
the forecasts. (06 Marks)
Year r98I 1982 1983 1984 1985 1986 1987 1988 l 989 1 990 r99t
Sales Rs.
x 1000
35 50 48 41 50 55 65 77 92 86 100
a. How do you define 'capacity' and how do you measure it? A factory wishes to acquire
stamping machines to produce 30,000 T shirts per month. They operate 200 hours per month
but the machines will be used of 75Vo of the time only and output is 5%o defective. A
stamping operation takes one minute per T-shirt. Assumin g 957o efficiency, how many
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b. Define 'Plant Layout'. Mention the main types of 'Processing Layouts'
PART _ B
a. Define 'Aggregate Planning'. Define 'Master Scheduling'
b. Mention the strategies for 'Aggregate Planning'.
(12 Marks)
(08 Marks)
What are the differences, if any?
(04 Marks)
(06 Marks)

2. 6a.
b.
1OME/PM81
c. Big Mart maintain a constant work force which can produce 3000 tables per quarter. The
annual demand is 12000 units and is distributed seasonally in accordance with quarterly
indexes Q1 = 0.80, Qz = 1.40, Q: = 1.00, Q+ = 0.80. Inventories are accumulated when
demand is less than capacity and are used up during periods of strong demand. To supply the
total demand i) How many tables must be accumulated each quarter? ii) What inventory
must be on hand at the beginning of the first quarter? (10 Marks)
Define ABC analysis, EOQ, ordering cycle. (06 Marks)
Calculate the economic lot size with uniform rate of demand and instantaneous replacement.
Give total costs and total annual costs. (06 Marks)
c. A stockiest has to supply 800 units per week of a product to his customers. He gets the
product at RS.75 per unit from the manufacturer. The cost of ordering and transportation
fromthemanufacturerisRs.l00perorder.Thecostof carryingis tATo peryearof thecost
of the product. Calculate the economic lot stze, time to produce the economic lot size and
total optimum cost per week. (08 Marks)
a. What is MRP and give the inputs required? (04 Marks)
b. What is ERP? , (04 Marks)
c. A work centre operates 6 days a week on a two shifts per day basis (8 hours per shift). It has
four machines with the same capacity. If the machines are utilized 757o of the time at a
system efficiency of 9070, what is the rated output in standard hours per week? (06 Marks)
d. Given the structure tree shown, compute the net requirements of A, B, C, D, E, F to produce
10 units of end item X. No stock is on hand. (06 Marks)
Fie.Q.7(d)
a. Explain the importance of purchase and supply management. (06 Marks)
b. Explain the concept of tenders and logistics management. (06 Marks)
c. Micro-Brush requires a new component for their laptop cleaning machines. The company
must decide whether to make or buy them. If it decides to make them, should it use process
A or process B? Use a Break-Even inalysis to advise them if the following data is given:
Make
A
Make
B
Buy
Annual volume 10,000 10,000 10,000
Fixed cost/year Rs.150,000 Rs.2,00,000
Variable cost/unit Rs.100 Rs.50 Rs.200
i) Should Micro make using process
ii) At what annual volumes should
other?
A or B or buy?
Micro switch from each make/buy decision to the
(08 Marks)
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(10 Marks)
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Control Engineering
Time: 3 hrs. Max. Marks:100
Note: Answer any FIVE full questions, selecting atleast TWO questions from each pert.
a.Distinguishbetweenopen1oopu.'o.,offionffolsystems, with suitable examples.
(04 Marks)
(06 Marks)What are the ideal requirements of control system?
What is Control Action? Briefly explain proportional, proportional plus derivative and
proportional plus derivative plus integral controllers, with the help of block diagrami
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Obtain the differential equation for the mechanical system shown in fig. Q2(a) and draw the
equivalent mechanical system, also draw the analogous electrical network based on
i) Force - voltage analogy ii) Force - current analogy. (10 Marks)
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Fig.Q2(a)
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b.
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Eighth Semester B.E. Degree Examfii6tion, June/July
b. Derive the transfer function of an armature controlled DC motor. The
maintained constant during operation. Assume that the armature coil
de
e b
: kn - and the, coil current produces a torque T = K.I on the rotor, K6
ctt
back emf constant and motor torque constant respectively.
formula, find the gain of the following system
'Ht
a.
a. Reduce the block diagram shown in fig. Q3(a) to its simplest possible form and find its
closed loop transfer function (10 Marks)
Fig.Q3(a)
b. Using Mason's gain
Fie.Q3(b)

4. Derive an expression for the unit step response of first order system.
lOME/PM82
(08 Marks)
A unity feedback system is characterized by an open loop transfer function
G(s) = ,
K,=,
. Determine the gain K, so that the system will have a damping ratio of 0.5.
s(s + 10) J
For this value of k determine peak time, setting time and peak overshoot for a unit step
input. (08 Marks)
Ascertain the stability of the system given by the characteristic equation
55 +4Sa+ 1253 +2052+30S + 100=0,usingR-Hcriteria (04Marks)
PART . B
Sketch the polar plot for the transfer function
G(s) =
10
s(s+l)(s+2)
b. Apply Nyquist stability criterion to the system with transfer function.
G(s) H(s) =
4s+l
and ascertain its stability.
s'(1 + sX1+ 2s)
(10 Marks)
4a.
b.
c.
a.
(10 Marks)
Sketch the Bode plot for
G(s)H(s):*.A1soobtaingainmarginandphasemarginandcroSSoVer
s(s+1)(1 +0.2s)
frequencies. (20 Marks)
Sketch the root locus plot for
G(s) H(s) = ; ::;
K
;:; ,i:, . fo. what values of K the system becomes unstable? (20 Marks)
s(s + 2)(s + 4)(s +6)
a. Explain the following : i) Lead compensator ii) Lag compensator. (12 Marks)
b. Determine the state controllability and observability of the system described by
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5. 10M8844USN
Time: 3 hrs.
a. Explain with a neat sketch normal and abnormal combustion in SI engines.
b. Sketch and explain Zenith carburetor.
c. What are the octane and cetane numbers?
a. What are the objectives of super charging and explain any
supercharging.
Eighth Semester B.E. Degree Examination, June/July 2015
Automotive Engineering
Note: Answer FIVE full questions, selecting
at least TWO questions from each parl
PART _ A
a. Explain the various methods of cylinder affangements in multicylinder engines. (08 Marks)
b. What do you mean by Swirl generation in CI engines? What are the different methods of
Swirl generation? (06 Marks)
c. What are the various methods of engine cooling? Explain with sketch the thermosyphon
system of cooling. (06 Marks)
M ax. M arks: 1 00
(06 Marks)
(10 Marks)
(04 Marks)
two arrangements of
(10 Marks)
charging giving its
(10 Marks)
(12 Marks)
air suspenstion system with
(08 Marks)
(08 Marks)
(04 Marks)
(08 Marks)
in the exhaust gas? With neat
(08 Marks)
reducing HC, CO and NO*
(04 Marks)
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b. What is the need of turbocharging? Explain any one method of turbo
merits and demerits.
a. What are the requirements of ignition system? Sketch and explain battery ignition system.
(10 Marks)
b. What do you mean by ignition advance? Explain the following ignition advance methods:
i) Centrifugal advance, ii) Vacuum advance. (10 Marks)
PART - B
a. Classify clutches (detailed classification). With neat sketch, explain working principle of
friction clutches" (06 Marks)
b. Explain necessity for gear ratios in transmission. (06 Marks)
c. Explain working principle of automatic transmission. (08 Marks)
a. With a neat sketch, explain the torque tube drive. What are its merits over Hotch-Kiss drive?
(08 Marks)
b. Define the following and explain their effect on steering:
i) Camber ii) King pin inclination
iii) Castor iv) Toe in and Toe out
a. What are the requirements of a suspension system? Explain
sketch.
b. Explain with aneat sketch working of master cylinder.
c. Differentiate between disc brakes and drum brakes.
a. Explain the controlling of crank case emissions, with sketch.
b. what are the methods used to reduqe amount of pollutants
sketch, explain exuast gas recirculation system.
c. What are catalyic converters? How they are helpful in
emissions.

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Note: Answer any FIVE fuU questions, selecting
atleast TWO questions from each part.
PART _ A
a. What are the advantages of stoker firing? Explain the working of traveling grate stoker with
a simple sketch. State its outstanding features. (10 Marks)
b. What is pulverized coal? Explain the BIN system of handling pulverrzed coal with a neat
diagtam. List the advantages and disadvantages of using pulverized coal. (10 Marks)
a. Draw a neat diagram of velox boiler and explain its working and advantages. (10 Marks)
b. Classify the ash handling system. Explain the working principle of mechanical handling
system with neat sketch.
a. Explain with sketch: i) Super heater; ii) Desuperheater.
b. Describe the working principle of natural draught cooling tower with
c. Explain the importance of cooling tower in a steam power plant.
d. Calculate the mass of flue gases flowing through the chimney when
equal to 2.0cm of water. Temperature of flue gases is 290"C and
27"C. The flue gases formed per kg of fuel burnt are 23kg. Neglect
diameter of the chimney as 1.9m.
a. Explain the necessity of cooling systems in diesel engine. What are
the engine? Explain.
b. Explain the importance of lubrication system in diesel power plant.
c. List at least six advantages and four disadvantages of diesel engine power plant.
d. Explain the working principle of closed cycle gas turbine with neat sketch.
PART - B
a. What are the advantages and disadvantages of hydro electric plants?
b. Explain the following:
i) Hydrographs ii) Storage and pondage iii) Water hammer.
With the help of sketch show all the important parts
function of each part.
Explain the characteristic feature of a boiling water
and external circulation?
Write short notes on disposal of radioactive wastes.
Examination, June/July 2015
Engineering
USN
Eighth Semester B.E. Degree
Power Plant
Time: 3 hrs.
10ME833
Max. Marks:100
(10 Marks)
(08 Marks)
neat sketch. (04 Marks)
(02 Marks)
the draught produced is
ambient temperature is
the losses and take the
(06 Marks)
the methods of cooling
(06 Marks)
(04 Marks)
(05 Marks)
(05 Marks)
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b.
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(12 Marks)
of nuclear reactor describing briefly the
(08 Marks)
reactor. What do you mean by internal
(08 Marks)
(04 Marks)C.
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7. 10M8833
7 a. Define the following terms:
i) Peak load ii) Demand factor iii) Load factor iv) Diversity factor. (08 Marks)
b. What are considerations to be made while selecting the suitable site for a thermal and a
nuclear power plants? (06 Marks)
c. A base load power station and stand by power station share a common load as follows:
Base load station annual output = 180 x 106 kryh
Base load capacity = 42 MW
Maximum demand on base load station - 36 MW
Standby station capacity - 22 MW
Standby station annual output = 17 x 106 kwh
Maximum demand (peak load) on standby station = 18 MW
Determine the following for both power stations i) Load factor ii) Capacity factor.
(06 Marks)
8 a. Enumerate various type of tariff and explain any two of them. (08 Marks)
b. What are the objectives and requirements of tariff? (04 Marks)
c. Explain the performance and operating characteristics of power plant. (08 Marks)
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