Download RTMNU previous year question paper will assist the st and more Exercises Thermal Engineering in PDF only on Docsity!
NRT/KS/19/3551 1 P.T.O
B.E. (Mechanical Engineering) Seventh Semester (C.B.S.)
Industrial Engineering
P. Pages : 4 NRT/KS/19/
Time : Three Hours Max. Marks : 80
_____________________________________________________________________
Notes : 1. All questions carry marks as indicated.
Solve Question 1 OR Questions No. 2.
Solve Question 3 OR Questions No. 4.
Solve Question 5 OR Questions No. 6.
Solve Question 7 OR Questions No. 8.
Solve Question 9 OR Questions No. 10.
Solve Question 11 OR Questions No. 12.
Due credit will be given to neatness and adequate dimensions.
Assume suitable data whenever necessary.
Illustrate your answers whenever necessary with the help of neat sketches.
Use of non programmable calculator is permitted.
Use of tables are permitted.
1. a) What is productivity. State the various factors, tools & techniques to improve
productivity.
b) The data for output produced and input used by a company for a specified period is given
in table 1. Assuming deflector for all output and all inputs as 1.2, find the partial and total
productivity indices
Table 1.
Particular Output Input Labour Material Energy Other
Year 2012 Rs. 1,00,000 Rs. 30,000 Rs. 20,000 Rs. 7,000 Rs. 5,
Year 2013 Rs. 1,20,000 Rs. 35,000 Rs. 22,000 Rs. 10,000 Rs. 6,
OR
2. a) Define method study. What are its objectives? Differentiate between work measurement
and method study.
b) What are therbligs? Give any five therbligs with symbols. How are they useful for
micromotion study?
3. a) What are the ergonomic considerations in man machine system? What are the objectives
of ergonomics?
b) State various techniques of work measurement. Also List down the factors affecting
performance rating.
OR
0286
NRT/KS/19/3551 2
4. a) What are the different types of allowances. How is standard time computated on the basis
of allowances?
b) The following data refers to the study conducted for an operation. Table 2 shows actual
time for elements in minutes
Table. 2.
Cycle
Elements 1 2 3 4 5
i) Element 2 is machine element
ii) Consider the observations as abnormal and delete the same if they are more than 20%
of average time of element.
iii) Take performance Rating as 120.
iv) Take following allowances and personal allowances = 3 0 minutes in shift of 8 hours.
fatigue allowance = 15%, contingency allowance 2% estimate the standard time of
production per 8 hour shift.
5. a) What is the need of forecasting? How are forecasting methods classified? 7
b) A company manufacturing washing machines establishes a fact that there is a relationship
between sale of washing machines and population of the city. The market research carried
out reveals the following information
Population (Million) 5 7 15 22 27 36
No. of washing machines demanded 28 40 65 80 96 130
Fit a linear regression equation and estimate the demand for washing machines for a city
with a population of 45 million.
OR
6. Discuss in brief any three.
i) Work sampling
ii) Principles of motion economy (Use of Human body)
iii) Types of Productivity.
iv) Forecast errors
v) Work sampling.
NRT/KS/19/3551 4
OR
12. Write short notes on any three.
a) Vendor Quality Rating
b) ISO 9000
c) Philosophy of six Sigma
d) TQM
e) Approaches to quality improvement
NRT/KS/1 9 / 3554 1 P.T.O
B.E. (Mechanical Engineering) Seventh Semester (C.B.S.)
Elective - I : Automobile Engineering
P. Pages : 2 NRT/KS/1 9 / 3554
Time : Three Hours Max. Marks : 80
_____________________________________________________________________
Notes : 1. All questions carry marks as indicated.
Solve Question 1 OR Questions No. 2.
Solve Question 3 OR Questions No. 4.
Solve Question 5 OR Questions No. 6.
Solve Question 7 OR Questions No. 8.
Solve Question 9 OR Questions No. 10.
Solve Question 11 OR Questions No. 12.
Illustrate your answers whenever necessary with the help of neat sketches.
1. a) What are the different types of thermostat used in automobile? Explain with neat sketch
working of wax type thermostat.
b) Explain the construction and working of solex carburetor.
OR
2. a) Explain with neat sketch pressure feed lubrication system. Also give its advantages over
other systems.
b) What are the different types of frames used in automobile? Write its functions and briefly
discuss any one of them.
3. a) Explain with neat sketch construction and working of diaphragm type single plate clutch. 7
b) What is Transfer Box? Write its functions. Also discuss its working with neat sketch.
OR
4. a) Enlist the types of Gear boxes used in automobile. Explain the construction and working
of sliding mesh Gear box with neat sketches.
b) Classify the Gear selector mechanism. Explain in detailed any one gear selector
mechanism.
5. a) Compare Hotchkiss and torque tube drive. 6
b) Classify Axles. Explain with neat sketch full floating Axle.
OR
6. a) Explain with neat sketch construction and working of engine exhaust brake. 7
b) Write the construction and working of double leading drum brake. Also gives its
advantages over single lead brake.
0290
NRT/KS/19/3555 1 P.T.O
B.E. (Mechanical Engineering) Seventh Semester (C.B.S.)
Elective - I : Power Plant Engineering
P. Pages : 2 NRT/KS/19/
Time : Three Hours Max. Marks : 80
_____________________________________________________________________
Notes : 1. All questions carry marks as indicated.
- Solve Question 1 OR Questions No. 2.
- Solve Question 3 OR Questions No. 4.
- Solve Question 5 OR Questions No. 6.
- Solve Question 7 OR Questions No. 8.
- Solve Question 9 OR Questions No. 10.
- Solve Question 11 OR Questions No. 12.
- Due credit will be given to neatness and adequate dimensions.
- Assume suitable data whenever necessary.
- Use of steam table, Mollier diagram is permitted.
1. a) What is load curve? give its significance. 4
b) A generating unit of 10 MW capacity supplies the following loads:
i) Domestic consumers with maximum demand of 6 MW at a load factor of 20%
ii) Small industrial load with maximum demand of 3.6 MW at a load factor of 50%
iii) Street light load with maximum demand of 400KW at 30% load factor.
Find overall cost of energy per kWh for each type of consumer using following
data.
Capital cost of the plant = Rs. 10,000 per kW
total running cost = Rs. 36,00,000 per year.
Annual rate of interest and depreciation on
Capital cost = 10%
OR
2. a) The yearly duration curve of certain plant can be considered as a straight live from 20
MW to 3 MW. To meet this load, three turbine generator units, two rated at 10 MW and
one at 5 MW are installed
Determine
i) Installed Capacity ii) Plant factor
iii) Maximum demand iv) Load factor
v) Utilization factor.
b) Explain the principle of economic scheduling. 6
3. In a thermal power plant steam expands from 150 bar, 550ºC to 0.1 bar. Find out extraction
point for four regenerative heaters. What would be the amount of bleeding steam in each
case.
OR
4. a) Explain with neat sketch modern pulverized coal fired thermal power plant. 7
b) Write a short note on combined cycle power plant. 6
NRT/KS/19/3555 2
5. a) Explain pulverized fuel firing and list its advantages and disadvantages. 6
b) Discuss fluidized bed combustion. What are the advantages and limitation of FBC? 7
OR
6. a) What is the principal of an electrostatic precipitator? With the help of neat diagram,
Explain electrostatic precipitator.
b) With the help of neat diagram, explain the working of two types of Air preheater. 6
7. a) A hydro-electric installation has a catchment area 64 sq.km and the run-off is 70%. The
average rainfall per year is 1300 mm and the head is 450m. Find the available power if the
rainfall is 80%
b) Discuss factors affecting the run off. 6
OR
8. a) The run off data of a river at a particular site is tabulated as below.
Month Mean discharge
(Millions m
3 )
Month Mean discharge
(Million's m
3 )
Jan 30 July 80
Feb 25 Aug 100
Mar 0 Sept 110
April 0 Oct 65
May 10 Nov 45
June 90 Dec 30
i) Draw the hydrograph and flow duration curve.
ii) Find the power developed if the head available is 90 m and overall efficiency of
generations 85%
b) Explain the function of surge tank in hydraulic power plant. 4
9. a) Write a short note on
i) Binding energy ii) Fuel Burn up.
b) Draw the neat sketch of Pressurize Water Reactor (PWR) and explain the role of
pressurizer in PWR.
OR
10. Each fission of U-235 yields 190 MeV of useful energy. Assuming that 85% of neutrons
absorbed by U-235 cause fission, the rest being absorbed by non fission capture to produce
an isotope U-236, Estimate the fuel consumption of U - 235 per day to produce 3000 MW
of thermal power.
11. a) Explain with neat sketch closed and open cycle gas turbine power plant along with its
advantages and disadvantages.
b) Draw and explain typical diesel engine power plant. 6
OR
12. Write a short note on
i) MHD power generation ii) Solar thermal power generation
iii) Wind power generation.
NRT/KS/19/3558 2
OR
6. a) What is Assembly modeling? Explain the various mating condition used in generation of
assembly modeling.
b) Explain the following:
i) Feature based modeling.
ii) Parametric based modeling.
7. a) Explain the steps carried out in FEM. 4
b) A stepped shaft as shown in figure (1) is fully restrained against rotation about its axis.
Twisting moment of 15 kN-m and 20 kN-m are applied at a point of Changing section.
Calculate
i) Angular displacement
ii) Stresses
iii) Support reactions, Assume
7 4
2 1
60 GN
G , J 2 10 mm ,
m
7 4 J 2 = 3 10 mm
7 4 and J 3 = 2 10 mm
J 1
J 2
J 3
15kN-m 20kN-m
1m 2m 2m
Fig. 1
OR
8. a) Explain principle of minimum potential energy with suitable derivation. 4
b) Figure (2) shows a uniform thickness plate i.e t = 10 mm fixed at both ends with tapering
width. Find i) Nodal displacement and stresses in each section
Take E = 200 Gpa.
J 2
100mm 150mm 150mm
Fig. 2
80mm
50mm (^) 100kN 50kN 100mm 20kN
NRT/KS/19/3558 3 P.T.O
9. For the truss in the fig (3) having members with cross - sectional areas
2 2 A 1 = A 3 = 20mm and A 2 =40mm ,
take E = 70 GPa.
Calculate the following:
i) Global stiffness matrix ii) Nodal displacement.
400mm 400mm
A 1 A 2 A 3
90º
60º 60º
P = 15kN
Fig. (3)
OR
10. For a plane stress Condition of a CST element shown in fig (4). Determine the nodal
displacement
Take E = 200 GPa, = 0.3 & thickness (t) = 10 mm
300mm
40mm
20kN
10kN
Figure (4)
11. a) Discuss in brief Adequate and optimum design. 5
b) A circular cantilever beam subjected to load of intensity 3 KN at its free end, the length
of beam is 1000 mm, the required factor of safety is 1.6. Design the circular beam for
minimum deflection. The material given are SAE 1010, Ph. Bronze and Aluminum alloy.
OR
12. A simple supported beam of rectangular cross Section having distance between support
900 mm
2 is subjected to load of 1 kN at mid point of beam. Design the beam with
following specification factor of safety = 1.5, d/b = 2.5. Depth should lie between 15 mm
to 150 mm. Design the beam for minimum deflection for the material SAE 1030, SAE
3120 (oil quenched) and Aluminum 260.
NRT/KS/1 9 /3559/3605 2
b) A centrifugal compressor delivers 16.5 kg/s of air with a total head pressure ratio of 4:1.
The speed of compressor is 15000 rpm. Inlet total head temperature is 20ºC, slip factor
0.9, power input factor 1.04 and isentropic efficiency 80%, calculate :
i) Overall diameter of the impeller
ii) Power input to the compressor.
OR
4. a) Explain the following terms related to rotary air compressor :
i) Surging and Choking
ii) Degree of reaction
iii) Pre-Whirl
b) An axial flow air compressor of 50% reaction design has blades with inlet and outlet angles
of 45º and 10º respectively. The compressor is to produce a pressure ratio of 6:1 with an
overall isentropic efficiency of 85% when the air inlet temperature is 33ºC. The blade
speed and axial velocity are constant throughout the compressor. Assume a value of 200
m/s for the blade speed, find the number of stages required when work factor is 0.89 for
all stages.
5. a) Describe with a suitable sketch the two stroke cycle spark ignition engine. 5
b) Describe a simple carburetor with a neat sketch and also state its limitation. 5
c) Discuss the difference between ideal and actual valve timing diagram of a 2S diesel
engine.
OR
6. a) Explain the phenomena of knocking in S.I. engine. What are the different factors which
influence the knocking? Describe the method to suppress it.
b) (^) Explain the stages of combustion in C.I. engines with the help of P- diagram. 5
c) Explain the components of fuel injection system system in C.I. engine. 4
7. a) Explain the method of determination of indicated power of a multi-cylinder engine. 4
b) A 4-cylinder petrol engine has an output of 5 kw at 2000 rpm. A Morse test is carried out
and the brake torque readings are 177, 170, 168 and 174 Nm respectively. For the normal
running at this speed the specific fuel consumption is 0.364 kg/kwh. The calorific value
of fuel is 44200 kJ/kg. Determine :
i) Mechanical efficiency
ii) Brake thermal efficiency of the engine.
OR
8. During the trial of a single cylinder, 4-stroke diesel engine the following observations
were recorded : Bore = 350 mm, Stroke = 450 mm, rpm = 400,
area of indicator diagram = 472 mm
2 , length of indicator diagram = 62 mm,
spring constant = 0.59 bar/mm, load on hydraulic dynamometer = 970 N,
dynamometer constant = 7500, fuel used= 10.78 kg/n,
calorific value of fuel = 50000 kJ/kg, cooling water circulated = 24 litres/min,
NRT/KS/1 9 /3559/3605 3 P.T.O
rise in temperature of cooling water = 24ºC. The mass analysis of fuel is : Carbon =
84%, hydrogen = 15%, incombustible = 1%. The volume analysis of exhaust gases is :
Carbon dioxide = 8%, Oxygen = 11%, nitrogen = 81%.
Temperature of exhaust gases = 380ºC, Specific heat of exhaust gases = 1.05 kJ/kg k,
ambient temperature = 20ºC, partial pressure of steam in exhaust gases = 0.03 bar,
specific heat of superheated steam = 2.1 kJ/kg k. Draw up the heat balance sheet on
percentage and minute basis.
9. a) Discuss the desired characteristics of refrigerant used in vapour compression system.
Also give nomenclatures of refrigerant based on methane and ethane.
b) A vapour compression refrigeration uses R-12 as refrigerant and the liquid evaporates in
the evaporator at - 15ºC. The refrigerant leaves the compressor at dry saturated vapour at-
15ºC. Find
i) COP if there is no undercooling
ii) COP if the liquid is subcooled by 5ºC &
iii) Percentage increase in COP due to subcooling Cp liquid = 0.747 kJ/kg k
OR
10. a) Sketch and explain in brief the working of simple vapour absorption system. Also give
its advantage over VCR system.
b) A food storage locker require a refrigeration capacity of 50 kw. It works between
condenser temperature of 35ºC and an evaporator temperature of - 10ºC. The refrigerant is
ammonia. It is subcooled by 5ºC before entering the expansion valve and dry saturated
vapour leaves an evaporator. Assume single cylinder, single acting compressor operating
at 1000 rpm with stroke equal to 1.2 times the bore. Determine :
i) The power required to drive the compressor
ii) The cylinder dimension and iii) COP of system
Cp liquid = 4.556 kJ/kg k , Cp vapour = 2.903 kJ/kg k
11. a) Explain the following terms related with moist air
i) Specific humidity ii) Dew point temperature
iii) Degree of saturation iv) Wet bulb temperature
b) The reading from a sling psychrometer are as follows :
Dry bulb temperature = 30ºC, wet bulb temperature = 20ºC ;
Barometric reading = 740 mm of Hg. Using steam tables, determine :
i) Dew point temperature ii) Relative humidity
iii) Specific humidity iv) Degree of saturation
v) Vapour density and vi) Enthalpy of mixture per kg of dry air.
OR
NRT/KS/19/3560/3606 1 P.T.O
B.E. (Mechanical Engineering / Power Engineering) Seventh Semester (C.B.S.)
Design of Mechanical Drives
P. Pages : 2 NRT/KS/19/3560/
Time : Three Hours Max. Marks : 80
_____________________________________________________________________
Notes : 1. All questions carry marks as indicated.
Solve Question 1 OR Questions No. 2.
Solve Question 3 OR Questions No. 4.
Solve Question 5 OR Questions No. 6.
Solve Question 7 OR Questions No. 8.
Assume suitable data whenever necessary.
Illustrate your answers whenever necessary with the help of neat sketches.
Use of non programmable calculator is permitted.
Use of Design data book is permitted.
1. a) Design a bushed pin type of flexible coupling for connecting motor shaft to a centrifugal
pump shaft for the following service conditions.
Electric motor - 30 kW at 960 rpm Diameter of pump shaft - 60 mm
b) The details of the hydrodynamic bearing for a diesel engine crankshaft are given below.
Max. Load on bearing = 16 kN
Speed = 2000 rpm
Diam. of crank shaft = 75 mm
Clearance ratio (C/R) = 0.
Viscosity of oil = 25 Cp
Min film thickness h min = 0.03 mm
Inlet oil temperature ta = 35ºC
Determine
i) The bearing pressure ii) Length of bearing
iii) Frictional power loss iv) Quantity of oil required
v) Out oil temp.
OR
2. a) A multi cylinder engine is to run at a constant speed of 700 rpm in T- diagram. The
areas above and below the mean torque line in mm
2 are as follows.
- 170 ; - 180; +175; - 205; + 195; - 155.
The scales for the diagram are for torque 1 mm = 225 N.m and for crank angle 1 mm = 4
degree. The speed is to kept 2.5% of the mean speed of the engine. Design the suitable
C.I. flywheel for the engine.
b) A 6309 single row deep groove ball bearing with the inner ring rotating has a 20 second
work cycle as given below.
Item For 12 sec For 8 sec.
Radial load 3600 N 2700 N
Axial load 1800 N 800 N
Speed 900 rpm 1200 rpm
Type of load Light shock Steady
Find expected average life of the bearing in hours of operation.
0295
NRT/KS/19/3560/3606 2
3. a) A belt is required to transmit 20 kw from a pulley 1.2 m diameter running at 250 rpm to
another pulley which runs at 450 rpm. The distance between the centers of the two pulleys
is 2.7 m. The center line of the drive makes an angle of 50º with the horizontal. specify a
suitable flat leather belt for the drive.
b) A roller chain drive is to be used in a power plant to transmit 15 kw from an electric motor
to reciprocating pump. The pump is to operate continuously 24 hours a day. The speed of
the motor is 720 rpm and that of the pump is 250 rpm. Design the drive and give the
specifications for the sprockets and the chain.
OR
4. a) Select a suitable wire rope for a mine hoist carrying a load of 25 kN to be lifted from a
depth of 120 meters. A rope speed of 15 m/sec must be attained in 10 seconds.
b) A centrifugal water pump running at 1200 rpm is driven by a 50 kW diesel engine running
at 400 rpm. The engine flywheel is to be used as the driving pulley. Design a V-belt drive
if the center distance should not be greater than 1.2 meters.
5. Design a spur gear drive to connect electric motor with reciprocating pump. Speed of the
motor is 1500 rpm and speed reduction is 5:1. Motor power is 30 kW. Also design gear
blank for larger gear.
OR
6. Design a pair of straight teeth cast iron bevel gears to transmit 60 kW from a shaft running
at 235 rpm to another running at 75 rpm. Check for continuous operation. Assume steady
load.
7. A worm gear drive is used for lifting the elevator cage at a rate of 100 m/min. The elevator
drum diameter is 600 mm and the load to be lifted is 20 kN. The worm gear is keyed to
the drum shaft. The elevator is driven by an electric motor running at 960 rpm. Determine
i) The worm and worm gear proportions.
ii) The temperature rise of the oil and
iii) The required power of the motor if the efficiency of the hoist is 94 percent.
OR
8. a) Design a cast iron piston for a single acting four stroke engine for the following
specifications.
Cylinder bore = 100 mm; stroke = 120 mm
Maximum gas pressure = 5 MPa
Break mean effective pressure = 0.65 MPa fuel consumption = 0.25 kg/kw/hr
Speed = 2000 rpm
b) Explain the advantages of wet Liners and dry Liners. 4
AHK/KW/19/2315 2
b) The sales for the product is given below. Estimate the demand for the year 1985. Find
the trend values for each of the five years also.
Year 1980 1981 1982 1983 1984
Sales (Rs.) (000) 50 65 75 52 72
OR
6. a) Estimate the sales forecast for the year 1992. Using exponential smoothing take (^) =0.3.
Take the sales forecast of Year 1984 at Rs. 16000/-
Year 1984 1985 1986 1987 1988 1989 1990 1991
Sales (Rs. x 100) 180 168 160 170 188 205 190 210
b) A company manufacturing tractors finds that there exists a relationship between sales of
tractors and index of the agricultural income. The data is given below.
Demand ('000) (Y) 100 112 130 150 280
Demand index (X) 125 140 180 190 220
i) Fit a regression line
ii) Estimates sales of tractors for demand index 240
7. a) Define maintenance. Explain various types of maintenance. 7
b) Describe various types of failures with the help of bath tub curve. 6
OR
8. a) A system is composed of three components, each components has an exponential time of
failure distribution with constant failure rate of 0.5 per 4000 Hrs. Compute component
reliability & system reliability of 2000 Hrs. of operation if components are connected in
series.
b) Compute system reliability for following system between A and B.
B A
9. a) Describe objectives of Quality Control Process. 6
b) A subgroup of 5 items are taken from a manufacturing process at a regular interval. A
certain quality characteristics is measured and (^) X and R values computed. After 25
subgroups it is found that X = 357.50 and R =8.80. If the specification limits are
14.40 0.40 and if the process in statistical control what conclusion can you draw about
the ability of the process to produce items within specification?
OR
AHK/KW/19/2315 3 P.T.O
10. a) Explain operating characteristics curve (OC) with a neat sketch. 7
b) The following table shows the number of defects observed in 25 similar castings. 7
Casting no. 1 2 3 4 5 6 7 8 9 10 11 12 13
No. of defects 7 14 14 18 8 14 8 11 20 12 22 15 8
Casting no. 14 15 16 17 18 19 20 21 22 23 24 25
No. of defects 24 14 9 9 11 10 8 9 11 7 26 8
i) Find c
ii) Compute trial control limits.
iii) What value of c can you suggest for subsequent period eliminating observation
lying beyond control limits?
11. a) Explain tools of statistical Quality Control. 7
b) Define Quality audit. What are types of quality audit? 6
OR
12. a) Describe elements of Total Quality Management (TQM). 6
b) Explain ISO 9000 series standards. 7
