elements of mechanical engineering jan 2014

3
USN r0ENIE14l24 First/Second Semester B.E. Degree Examination, Dec.2013 I Jan.20l4 Elements of Mechanical Engineering Time: 3 hrs. Max. Marks:lO0 Note: l. Answer any FIW full questions, choosing at least twofrom each part. 2. Answer all objective gtpe questions only in OMR sheet page 5 of the answer booklet. 3. Answer to objective gtpe questions on sheets other than OMR will not be valued. 4. Use of steam table is permitted. '., PART _ A 6) o o L a (.) : () ?a Gv =n -*l coo .= c'l b?! otr -O a= o() -! do b0c c6d -o: -s ss= E(6 -?o 'Ea or= ^X () --t o= ed !o ^.= i,a b0- e5Q 6= *o tr> :o o-i Lr< t,^ () o '7 o I a. Choose the.correct answers for the following : i) Coal is.an,example for _ energy sources. A) renewable B) non-renewable C) celestial energy ii) Photosynthesis process is also known as A) Helio therrnal process C) Helio electrical process C) single tube boiler A) reaction turbine C) open or closed gas turbine B) Helio chemical process .D) Pizeo electric process B) vertical boiler D) externally fired boiler (04 Marks) D) bio-mass (02 Marks) (06 Marks) ,,, (04 Marks) D) pgtential of moving blades (06 Marks) (06 Marks) (04 Marks) iii) Partially dry steam and:partially wet particles in steam called as A) dry steam 'i ' B) super heated steam Babcock and Wilcox boiler is an example for _. A) fire tube boiler Name any four boiler mountings and state their-:functions. iii) Dry steamat 1O0 kPa abs - iv) Steam at.l2bar and95o/o dry. , ,.1,1 2 a. Choose the correct answers for the following : , . , i) , .,'Steam turbine converts in to mechanical energy. A) kinetic energy B) weight C) velocity ' ii) Compounding consists of one set of nozzle and two or more set called as A) velocity compounding C) pressure velocity compounding iii) Pelton wheel is example for A) reaction water turbine C) impulse water turbine iv) Combustioned gas is directly converted into the mechanical power called as b. c. d. b. c. d. With the help of neat sketch, explain the working of a Francis turbine. (08 Marks) Determine the total heat content per unit mass at the following state using the steam tables. Assume ambient pressure to be 100 kPa and Cp: 2.0934 kJ/kg. i) 10 bar absolute and 300"C ii) 100 kPa gauge and 100 kPa abs and 250oC B) pressure compounding D) velocity pressure compounding B) low head water turbine D) steam turbine B) impulse turbine D) steam turbine Explain the principle and working of reaction turbine. With the help of a neat sketch, explain the working of a Francis turbine. Explain the working principle of a gas turbine on closed cycle. Gf;S{liiX't- Li'#iili-i:i u www.pediawikiblog.com For More Question Papers Visit - www.pediawikiblog.com For More Question Papers Visit - www.pediawikiblog.com www.pediawikiblog.com

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Page 1: Elements of Mechanical Engineering Jan 2014

USN r0ENIE14l24

First/Second Semester B.E. Degree Examination, Dec.2013 I Jan.20l4

Elements of Mechanical Engineering

Time: 3 hrs. Max. Marks:lO0

Note: l. Answer any FIW full questions, choosing at least twofrom each part.2. Answer all objective gtpe questions only in OMR sheet page 5 of the answer booklet.3. Answer to objective gtpe questions on sheets other than OMR will not be valued.4. Use of steam table is permitted. '.,

PART _ A

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I a. Choose the.correct answers for the following :

i) Coal is.an,example for _ energy sources.A) renewable B) non-renewable C) celestial energy

ii) Photosynthesis process is also known as

A) Helio therrnal processC) Helio electrical process

C) single tube boiler

A) reaction turbineC) open or closed gas turbine

B) Helio chemical process

.D) Pizeo electric process

B) vertical boilerD) externally fired boiler

(04 Marks)

D) bio-mass

(02 Marks)

(06 Marks)

,,, (04 Marks)

D) pgtentialof moving blades

(06 Marks)(06 Marks)(04 Marks)

iii) Partially dry steam and:partially wet particles in steam called as

A) dry steam 'i ' B) super heated steam

Babcock and Wilcox boiler is an example for _.A) fire tube boiler

Name any four boiler mountings and state their-:functions.

iii) Dry steamat 1O0 kPa abs -iv) Steam at.l2bar and95o/o dry. , ,.1,1

2 a. Choose the correct answers for the following : , . ,

i) , .,'Steam turbine converts in to mechanical energy.A) kinetic energy B) weight C) velocity

' ii) Compounding consists of one set of nozzle and two or more setcalled as

A) velocity compoundingC) pressure velocity compounding

iii) Pelton wheel is example forA) reaction water turbineC) impulse water turbine

iv) Combustioned gas is directly converted into the mechanical power called as

b.

c.

d.

b.c.

d.

With the help of neat sketch, explain the working of a Francis turbine. (08 Marks)Determine the total heat content per unit mass at the following state using the steam tables.Assume ambient pressure to be 100 kPa and Cp: 2.0934 kJ/kg.i) 10 bar absolute and 300"Cii) 100 kPa gauge and 100 kPa abs and 250oC

B) pressure compoundingD) velocity pressure compounding

B) low head water turbineD) steam turbine

B) impulse turbineD) steam turbine

Explain the principle and working of reaction turbine.With the help of a neat sketch, explain the working of a Francis turbine.Explain the working principle of a gas turbine on closed cycle.

Gf;S{liiX't-Li'#iili-i:i

u

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Page 2: Elements of Mechanical Engineering Jan 2014

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3 a. choose the correct answers for the following ' (04 Marks)

i) Otto cycle engine is an example for

A) petrol engine gl Ji;el engine c) dual engine D) all of these

ii) 4 stroke engine has power stroke in

-

orrornorirre cv :

A)everycycleB)everyalternativecycleic) every third cycre D) in ali the revolution of the crank shaft' '

iiD rn t*o-Jt-t. p.trot engine compressive ratio.is approximately

A) r:22 e; t'tt ^ C) l:i o) 1:80

'

iv) piesel cycle engine is also called as D\ ^^-olonr nraea.rc

a) corrsiarrt vohime cycle B) constant pressure cycle

":' C) dual cYcle D) all of these '

b. E*piaiiJrJittr u,r.ut figure 4 stroke petrol engine. ,,, ' I (08 Marks)

c. Differentiatl u.t*..;4 stroke and ) stroke engine. i (04 Marks)

d. cir. uoru*:ii;;';;,;";,-k. "ttgi". over four stroke engine' , (04 Marks)

---^ c^-+L^ 4.^ll^.r,ino ' :':: (04 Marks)a. Choose the corr€e1'answers for the following :

,':i) Good refrigerant should be

A) high boiling Point B) flammable

ci row thermai.;nAn ti'itv DJ non-toxic

iD Unit of refrigeration ii''

C) Ampere of rJfrigeration' ' '' '"1 D) None of these

iii) Ammonia refiigerant is used in;,*,* ieti8elltol'

C) vapourcompression . r ^., , D)airconditioner

ir) Function of theihrottle valvetn a refrigetator is to

A) reduce the PressurQ' ,

B) increase the PressureC) converts vapgur'iefrigerant into liquid i',

D) liquid refrigerant into vapour converslon

b. Describe with a neal,Sketch, the working of vapour.absorption'refrigerator' (08 Marks)

;: "ffih;;;k;ril;i;.""r" "ir_."ndit[ner,

exptain its worlringprinciple. (08 Marks)

PART _ B

5 a. Choqse the correct answers for the following :

i) ' ,"

Function of the lathe is

" A) Produce cYlindrical Parts

, C) Produce slots

ii) SPeed lathe is examPle for

A) geared head lathe B) simple lathe

" :: (04 Marks)

B) produce keY holes ""!

D) all of these

C) universal lathe D) caption lathe

b.

c.

ii, Reaming oPeration is a ,-\ i ,lA) drill operation B) lathe operatton

C) milling operation D) grinding operation

iv) Radial drilling machine is used for' / A) small *ork, B) medium works

i) medium and heavy works ) all of these

With a neat sketch, L*pi"i"."nstruction and operation of radial drilling machine'

Explain with figure iai., trtttittg with compound slide swiveling method'

(08 Marks)(08 Marks)

2 of3

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Page 3: Elements of Mechanical Engineering Jan 2014

6a.

7a.

8a.

b.

c.

d.

With the help of a neat sketch, explain the working of a universal milling machine.(08 Marks)

Choose the correct answers for the following :

i) Milling machine removes the metal usingA) multi point cutting toolC) abrasive wheel

ii) Work piece and cutting tool moves in the same direction called as

A) up milling B) down millingC) combination of up and down milling D) all of these

iii) Emery is an example for _ abrasive.A) natural B) synthetic C) artificial

iu) Center less grinding is used forA) long work pieceC) both long and short work piece

t0EN,.Et4l24

(04 Marks)

B) single point cutting toolD) drill bit

D) clay

B) short work piece '

D) internalgrinding

(06 Marks)(02 Marks)

(04 Marks)

(06 Marks)(04 Marks)

(04 Marks)

B) increase spee4,, ,,,

D) decrease in speod,,.:

B) creepD) all of these

(06 Marks)

Explain with figure working principle of center less grinding machine.Explain any': milling operation.

.t,.

Choose the correct answers for the following :

D Fusion welding is an example forA) resistance welding ,B) arc weldingC) forge welding D) Thermit pressure welding

ii) Copper base filler metal is used forA) soft soldering B) hard soldering C) brazing D) welding

iii) Grease is an example lor _ lubrication.A) solid B) liquid:,, C) semi liquid D) all of these

b.

c.

d.

iv) Collar bearing is also kno'ryn asA) journal bearing B) tlrust bearing C) foot step bearing D) radial bearing

Explain the principle of arc welding with a figuie. (06 Marks)Name the three types of oxy-aCetylene flame. Expiain the application of each of them.

Describe the drop feed oil lubrication with neat sketches.,,,Choose the correct answers for the following :

D Jockey pulley is used forA) inorease arc of contactC)'deCrease arc of contact

ii).-V/henabe1tmoVeSforwardwithoutcarryingpul1eyscalled,.. A) slip

C) both slip and creepiii) Chain drive is used in

A) center distance less than 8mC) positive power transmission

iv) Spur gear is example forA) parallel axis B) non-parallel axis C) co-axial D) non-intersecting

b. With a neat sketch, explain past and loose pulley.c. Explain following gears:

i) Spur gear ii) Helical gear iii) Bevel gear iv) Rack and pinion (06 Marks)d. In a compound train of wheels, the wheels A, B, C and D have 15, 30, 20 and 40 teeth

respectively. The wheels B and C are keyed to the same spindle. If the wheel A runs at400 rpm, find the speed of the wheel D. Sketch the arrangements.

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3 of3

B) high power rrunr-irrioNfug 67'D) all ofthese -----

(04 Marks)

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