Telco Papers

Tech paper(mech) > >1)Youngs modulus of mild steel > 2.2* 10^6kg/cm2 >2)rod of dia(given)length(given)subjected to >stress(given) and "E"(given). > what is increase in length. > 0.2cm >3)centipose is unit of........... > viscosity >4)hardness is measured in > brinell no. >5)steady rest is used in....... > i) milling ii)lathe (2 more option) >ans- lathe > >6)rotating cutter and sliding w/p(process is) > i)milling ii)shaping iii)swaging 7)maxm deflection of beam supported at >two ends and >loaded at centre >8)cantilever beam failure occurs at ...... > support >9)what type of fit is H9f9 > i)interference fit ii)shrink fit...etc. >10)surface finish is represented by.... > i)square ii)circle iii)rectangle ....none of these >11)broaching is done to produce.... > i)internal keyway ii)splines...(2 more options) >12)twist drill is specified by > i)lip angle,dia > ii)lip angle , material,dia > iii)dia ,shank, material >13)in diesel engine.. injection occurs .. > i)20degree btdc > ii)20 degree atdc > iii)12 degree atdc... >14)in 4-stroke engine ratio of cam shaft and crank >shaft rotation i)1:2 ii)2:1 ....etc >15)two gears ...one(driving) at 100 rpm and other 300 >rpm....driven has m=4 and no. of teeth 60 > distance b/w centre is.... >16)reduction ratio ofspur gear > i)1:4 ii) 1:20 iii)1:10..... >17)cemented carbide tool is used at..... > low , medium , high or all speed >18)hardness signify....resistence to. > scratching machining > etc 19)coefficient of friction between cast iron and mild >steel.... > i)0.2 ii) 0.3 iii) 0.001 etc. >20)in SAW arc is struck under flux > i)to prevent oxidation..(3 more options) >21)which test is used for non ferrous material weld >... > magnetic particle test >22)clutch is located between.....

> engine and gear box >23)thermal efficiency of diesel engine is.... > i)less than 20% ii)less than 30%...etc >24)in CI engine injection takes place ... > at the end of compression stroke >25)clearence volume(given)...suction volume(given) > what is compression ratio. >26)what type of sress is hertz stress. > i)tensile ii) shear iii)contact.... >27)two helical spring is arranged in parallel ...the >stiffness is ans- sum of stiffness >28)99% tolerance is > ans- < 3* (sigma) > >29)two cube ..one is half submerged and other is 2/3 >submerged …. > Ratio of their densities…. >Ans -3:4 > >30)for ammonia HP per tonn of refrigeration > >31) model of pump of 20 HP ….rotates at 400 rpm (head >is 20m) > find out speed when head is 60 m( given model dia >is ¼ of original)

TELCO Paper Follows: 1.Ratio of speed of camshaft to crankshaft in > >4-stroke engine? > > (a)1:2 (b)2:1 (c)1:4 (d)4:1 > >2.to change the dir. of rotation of 3 phase > >induction moterwe have > >to change? > > > >3.why we make initially star-connection then > >delta-connection? > >4.H8/f8 shows? > > (a)clearence fit (b)shrink fit (c)interference fit > > > >5.centipoise is the unit of? > > (a)hardness (b) viscosity > > > >6.brinnel no. is the unit of? > > (a)hardness (b) viscosity > > > >7. hardness is? > > (a)resistance to deform (b)resistance to > >machining > > (c)resistance to abbration > >

> >8.moudoulus of elasticity of mild steel? > > (a)2.2*(10**6) (b)3*(10**6) (c)2.2*(10**5) > > > >9.co-efficiant of friction for mild steel & cast > >iron? > > (a).3 (b).1 (c).01 (d).5 > > > >10.in vechile cluch is used between? > > > >11.in metric thread the angle is? > > (a)45 (b)55 (c)30 > > > >12.in lathe(lead screw) the thread is used is? > > (a)BSW (b)square > > > >13.idler pully is used? > > (a)low load,high speed (b)high load low speed > > > >14.in which operation tool rotates and work piece > >moves > >linearly? > > (a) milling (b)turning > > > >15.broaching is the process of? > > (a)finishing hole (b)making hole (c)splines > >(d)keyway > > > >16.nitriding is? > > (a)harden core (b)harden surface (c)soften > >surface > > > >17.in sumerged arc welding why filler is kept in the > >molten > >material?\ > > ans-to prevent oxydising the upper surface > > > >18.the thermal efficiency of C.I engine? > > (a)ans-around 30% (B)around 15% > > > >19.in C.I engine after compression stroke? > > (a)ans-only fule is injected (b)mixture is > >injected > > (c)air is injected > > > >20.twist drill is specified by? > > (a)flute& dia (b)twist angle&dia > > > >21.the reduction speed ratio of spur gear is? > > (a)20:1 (b)2:1 (c) > > > >22.luminious is unit of? > > ans-light > >23.carbide tool is used for? > > (a)high speed (b)low speed (c)all speed (d) > >medium speed > >

> >24.+ve back rake is used for? > > (a)Al (b)mild steel (d)cast iron > >25.acid rain occurs due to this exhaust from C.I > >engine? > > (a)sulpher (b)CO > > > >26.which machin is rested support? > > (a)milling (b)shaper > > > >27.anmneling is used for? > > (a)softening (b)remove stress > > > >28.in cantilever beam if force is increased an non > >supported end > >chance of failure is? > > (a)anywhere (b)middle (c)near wall side > > > >29.in simple supported beam when force is acting at > >middle, max. > >deflection is?? > > > >30.surge pump is used in pipe line for?? > > > >31.E=2000kg/mm*2, stress=200 kg/cm*2, length > >l=200mm, dia.=40mm > >then channge in length=? > > > >32.in two gear system moudle,teeth of one gear,speed > >of both gear > >is given.you have to calculate center distance? > > > >33.the thickness of mild steel is given,you have to > >create a > >hole(dia. is given,speed of something is > >given=22m/min.you have to > >calculate another speed perhaps cutting speed in > >rpm.?? > > > >34.3 coplanner fore are ,angle betwwen P & R is 90.P > >& Q is > >120.if > >Q=20 then.P=? > > > >35.two of same mass.first is inside the water by 1/2 > >volume other > >by > >2/3 volume.what is ratio of their densities? > > hi friends, this mail is the continuation of the previous mail OF TELCO.

aptitude section be fast as questions really need time #2 questions from series completion----- answer of one of which is 60 one completion of series of alphabets answer was bab #1 question was that if x* is greatest integer less then that number then to find the value of the sequence answer was 6 #1 question in which relation between x an y are given in form of series of numbers, guess the relation between x and y and complete the series #1 question in which two linear equation was given, in terms of variables x,m,z,y then to find the coorect choice--- choices comprise of other relation between the parameters #1 question in which a ratio of a mixture composition made of cement and some other materials was given....to find the amount of cement needed.......answer was 45 #2 or 3 simple question based on percentage and profit and loss #1 question based on BODMAS rule...... answer was .0012 #1 question in which a square was inscribed in a circle to find the area of square answer was 2a^2 #1 question in which it was given that x
another one........apple has been used as ....... an object of passage question that what does "natural law" means........ answer is most probably...... induction question that what does "extensive reference" means question in which two statements was given and a conclusion made on basis of them was given........it represents syllogism # quex. based on jigs and fixtures # quex. based on carbon content in die steel # return mechanism is not used in ....a . bore b. planar ... #what does 123+ .5 represents... #angles r in the ratio 1:2:2... then the triangle is.... isosceles # distance between a &c is 60, a&b is 50 and b&c is 50.... find the shortest distance from pt. b on line ac..... ans. 40 km. ARRANGING QUESTIONS... a question of arranging a series of mechanical instruments on the side of a wall ...they were seven in number........name of mechanical instruments was given just to confuse you...... take the instruments as lathe(l), polisher(p), air conditioner(a), H, B, D, S conditions... # lathe must always be at position 2 a&h must be together, s can stay with either b or d.., lathe and polisher must not be adjacent... # deduction... p can either be at 5 or 7(two questions on this) 5 more questions on the above conditions ....... it is a simple question of arranging it....... there were 5 to 6 question based on it ----------------------------------------------------------------------SOME MORE APTI QUESTIONS(SOME OF THEM MIGHT BE SAME) APTITUDE: 1.0.0024/.012*.006= 2.A square is inscribed in a circle , radius of the circle is 'a'.Area of the square= Ans:2a^2 3.The angle of a triangle is 1:2:2 then the triangle is Ans:isosceles 4.X's salary is 150% of Y, and Z's salary is 75% of Y, their total salary is Ans:1000 5.g[x]=1+x/2, then value of g[2x] in terms of g[x] is 6.If X
Ans:6 10. Series of An is given by (An-1)^3,if first value of An is 1 find the series up to four steps Ans:0,-1,-8,-729 11.Simple questions based time and distance 12.In a city 90% people has car, 15% has motorcycle, 100% has car or motorcycle then how many of them have only car and motorcycle. 13.Two problems are based upon coding 14.There was a short passage giving clue of sequence of different items eg. lathe , compressor... Six problems are based upon their positions (reasoning) 15.One reading comprehension was given of which atleast 7 to 8 questions were asked. ===SENTHIL (EEE-NITC) hi friends, im sending u telco -trical paper.since the company came here( nit,calicut ) long back i was able to recollect and collect only this much.anyway this will surely help u. IM SENDING THE PAPER IN TWO PARTS AS IT TAKES ============================================== MORE TIME TO BE SENT. ====================== after the written there was gd.the topics given here were 1.VALUES OF LIFE 2.SCOPE FOR AUTOMOBILE AFTER 20 YRS. as far as interview is considered eee has only less scope. it was completely technical .anyway try ur best in interviews. all the best to all.bye -telco 2002 two sections aptitude technical technical is different for mechanical,matelargical and same for electrical and electronics technical is very easy and contains only elementary concepts in aptitude there were 40 questions in 30 minutes there were different sets with question no. changed last 10 questions were on material science like what is the role of sulphur in rubber what is mixed in steel like that curie temperature of ............. ans of one ques was doping photodiode is made of si,ge,gallium aresnide none newton's law of viscosity luemn is unit of what motor used in traction

remaining 30 questions are *there are cars two red which are adjecent to each other four yellow two green which are not adjecent three blue which are adjecent red and green are on the ends now there were six questions like if green is on 8th position then which is on 6th or which cannot be there was one reading comprehension and five questions first question was on main theme one of the question was if u have to devide this passage in two parts then what would be the first line of second passage this passage was on (reading and writing skills) so first part was on writing and next part was on reading remaining 19 questions were on mathematical apti like an equation was given 2x3+kx2+7x+8 for what value of k (x+2)is a facotor of given equation answer of one question was 444(two trains are coming towards each other and one covers 60km more than the other tell the total distance covered ) some questions were engineering question type like a car is running at some speed and break of some retardation was applied then what distance it will cover before stopping v2=u2+2as basically the paper was easy and u can easy make it in our(electrical) technical paper lots of electronics questions were there then there was gd which is an elimination round topics were an organization needs leader not managers if something is broken let it remains so your dress is index of ur character will globalization kill indian industry disinvestment is good or bad indian youths are more inclined towards monitoring comforts rather than challenging jobs prepare and do well in gd and try to speak as much as possibe and try to put good points they are looking for people who are good leader try to lead the group then interview is core and little bit of hr

technical paper of electrical and electronics 1.(s+a)(s+b)/(s+c)(s+d) at what phase diff. freq tends to infinity 2. least power is consumed in ttl,cmos etc 3.which of the following represents an integrater there were four fig. having opamp and arrangement of capacitors and resistors 4.the resolution of adc depends on add line,data line,clock,none of these 5.the speed of microprocessor depends on add line data line clock none 6.the motor is started in star and run at delta to ans reduce rush in current 7.best speed regulation in dc motor series shunt universal none 8.ques on emitter follower calculation and its input resistance 9.its output resistance 10.ques on feedback amplitude 11.input impedence of opamp is high low 12.16 bit add line may address how many locations 13.two ques on simple resistance calculations 14.a ckt is given containing a battery resistance and inductor find steady state current 15.ques on ttl cmos rtl and dtl comparison 16.which is used for power factor improvement and synchronus motor 17.induction motor running on no load has and low power factor 18.speed of induction motor can be controlled by voltage,freq,both,none 19.igbt is ans power amplifier 20.one ques on bridge rectifier 21.the logic value 1 of ttl is some voltage (1.7,.8 etc)

TECHNICAL SECTION(FOR E.E.E AND E.C.E STUDENTS) THERE WERE 30 QUESTIONS. (Answers are written in brackets) 1)Rating of 3phase domestic supply(440v,50 Hz.) 2)What is pulse width modulation 3)Use of 8279 chip 4)Which of these is used as interface with IBM pc(RS232) 5)A circuit was given and was asked to find current through 10 ohm resistor(0A as it was a balanced

wheatstone circuit) 6)which of these material is widely used in IC fabrication(silicon) 7)which one is measured by moving coil(rms value,check the answer----not sure) 8)forward bias voltage drop across LED(1.4v) 9)true rms value is find for(answer is either sinusoidal or periodic-----see it) 10)auxillary carry is used for(BCD arithmatic) 11)power factor is improved by(synchronous motor) 12)Which connection is used for industrial application(3phase star connection) 13)a circuit was given series rlc circuit, to find whether it is leading or lagging(leading) 14)method used for PCB fabrication(grinding) 15)transfer function was given, to find the phase shift(0 as the no. of zeroes were equal to no. of poles=2) 16)which motor has starting torque(series) 17)which motor is used for lathe(squirrelcage induction motor------ but check about stepper motor also) 18)which of these cannot be done in transformer(frequency conversion) 19)distribution transformer load is connected in(star) 20)which line is used for fax(telephone line) 21)why multiplexing of address and data bus is done(less numbr. of pins) 22)which of these method is not used for finging stability of system(shemann method) 23)maximum value that can be displaced by 3 1/2 LED(1999) 24)supply voltage changed from v to v/2 then change in speed, means find speed corresponding to v/2 voltage,given speed corresponding to v voltage for motor 25)if emf induced from Eb1 to Eb2 then change in speed of motor 26)to find the openloop transfer function of a system figure was given which had feedback(there seems some error in question so we find the closedloop transfer function, -----------------------------------------------

__________________________________________________ hi friends, this mail is the continuation of the previous mail OF TELCO.

aptitude section

be fast as questions really need time #2 questions from series completion----- answer of one of which is 60 one completion of series of alphabets answer was bab #1 question was that if x* is greatest integer less then that number then to find the value of the sequence answer was 6 #1 question in which relation between x an y are given in form of series of numbers, guess the relation between x and y and complete the series #1 question in which two linear equation was given, in terms of variables x,m,z,y then to find the coorect choice--- choices comprise of other relation between the parameters #1 question in which a ratio of a mixture composition made of cement and some other materials was given....to find the amount of cement needed.......answer was 45 #2 or 3 simple question based on percentage and profit and loss #1 question based on BODMAS rule...... answer was .0012 #1 question in which a square was inscribed in a circle to find the area of square answer was 2a^2 #1 question in which it was given that x
question in which two statements was given and a conclusion made on basis of them was given........it represents syllogism # quex. based on jigs and fixtures # quex. based on carbon content in die steel # return mechanism is not used in ....a . bore b. planar ... #what does 123+ .5 represents... #angles r in the ratio 1:2:2... then the triangle is.... isosceles # distance between a &c is 60, a&b is 50 and b&c is 50.... find the shortest distance from pt. b on line ac..... ans. 40 km. ARRANGING QUESTIONS... a question of arranging a series of mechanical instruments on the side of a wall ...they were seven in number........name of mechanical instruments was given just to confuse you...... take the instruments as lathe(l), polisher(p), air conditioner(a), H, B, D, S conditions... # lathe must always be at position 2 a&h must be together, s can stay with either b or d.., lathe and polisher must not be adjacent... # deduction... p can either be at 5 or 7(two questions on this) 5 more questions on the above conditions ....... it is a simple question of arranging it....... there were 5 to 6 question based on it ----------------------------------------------------------------------SOME MORE APTI QUESTIONS(SOME OF THEM MIGHT BE SAME) APTITUDE: 1.0.0024/.012*.006= 2.A square is inscribed in a circle , radius of the circle is 'a'.Area of the square= Ans:2a^2 3.The angle of a triangle is 1:2:2 then the triangle is Ans:isosceles 4.X's salary is 150% of Y, and Z's salary is 75% of Y, their total salary is Ans:1000 5.g[x]=1+x/2, then value of g[2x] in terms of g[x] is 6.If X
12.In a city 90% people has car, 15% has motorcycle, 100% has car or motorcycle then how many of them have only car and motorcycle. 13.Two problems are based upon coding 14.There was a short passage giving clue of sequence of different items eg. lathe , compressor... Six problems are based upon their positions (reasoning) 15.One reading comprehension was given of which atleast 7 to 8 questions were asked.

Last year one ************** There are two sections each containg 40 questions.One arthematic and another is reasoning. In arthematic 11 are data sufficiency and 8 are anology.In reasoning all are puzzle type. Probably he rejects very few from test , since after that GD follows. Any I am sending some q's as for as my rememberance. Arthematic 1) Hypothesis :problem (below 4 he will give) 2) Mirror:Image 3)money:Misapprobation 4)nackles:Adoration 5)construction:building 6)file:pile 7)ours:we 8)1/3,1 1/3,3,5 1/3, next 9)Selling price of 4 articles=Cost price of 3 articles then %loss(ans. 25%) 10)|x-3|=3-x then x= 11)data sufficiency p>q? 1)p,q positive 2)q-1=q*2+p This type you can see in GMAT book. Reasoning 1) ABCDEF attended for an interview, in which 3 were selected A is worst of the lot C got equal marks as F(C=F) DC There are 5 questions below this. 2)There are 7 fellows sat in the following way C and F always sit as a apart as follows No. of fellows sat b/w c and D and D and F are equal like that he has given Ans: Order is as follows C E B D A G F by using this you can answer all

About 4 to 5 are there 3)ABCDE are five brothers. There are twins(only one pair of equal age) both are neither younger nor older. D is younger to 3 brothers. B is older than E and C. q's like who is youngest? Eldest ? About 4 are there. 4)A person has meet a king for that ha has to cross 7 gates. At each gate he has to pay half the amount he is carrying. Finally he gave Rs 3/- to the king. Then the amount he carried at the beginning and some questions (about 5)like that. 5) Heros tell truth and cowards lie.There PQR three persons. P tells Q "I may be hero or I may be coward". Q tells R "P was telling that he was coward. Then R tells Q "P was not a coward but he was a hero". You better study the question it may not be entirely correct. In thus 3 q"s are there

Best of luck The order of the questions is not the same as in the question paper.There were two sections apti &technical. Both had 40 questions nad the time for each section was 30 minutes. I am sending as many questions as I could recall. APTITUDE: 1. a long expression 164m2n2+…………+300n+225.what is the square root of this expression. Ans. (a) 2.In a town there are 3 clubs A,B and C having 40,50 and 60 members. 10 people are members of all clubs.70 people are members of only one club.and all people are members of at least one club.find how many people are members of exactly two clubs. 3.Two persons are walking towards each otherand then back to there original places.. One is at A and and the other is at B. they meet first time at a distance of 12 km from B and while returning they meet at a distance of 6 km from A.find the distance AB. . ans. 30. 4. value of Ans. 3.

6 + ( 6 + ( 6 + ........ .

5.one question based on the formula V2-U2=2aS. Ans. -1.6m/s2. 6. pick the odd one out: (a)bull (b)mule(c) bear (d) stag. Ans. Mule. 7. analogy – sly:fox:: fast:?.

Ans. Cheetah. 8. find thw word which has the meaning : without fear of punishment. Ans. Impunity. 9. Astranaut:cosmonaut::?: ? find thw pair which has opposite meaning to the given pair. Ans. (c)aviator:navigator. 10.n is the no. of copies in each book. b is the no. of books. nb<200. if n is decreased by b increases by 3. what is the value of nb? 11.there was a problem on clock. The clock shows 12:30p.m. on march 1. it stops for I min after each hour. What is the actual time whan the clock shows 12:30 p.m.on march 3. 12. There are 3 letters and 3 envelopes. In how many ways one can send 1 letter wrong. Ans. None of these. ( DO NOT WASTE TIME ON SOLVING THIS QUESTION.) 13.2<=x<=4, and 1<=y<=3. Max and min value of y/x. Ans. Max 4, min 2/3. 4-5 questions were on assertion reasoning. One question is given. Two sentences are given. Then 4 choices. A if only one statement is needed to answer the question.etc. the following 3 questions are of assertion reasoning type. 14.f(x)=2ax2+bx-c. dy/dx=some value(given I forgot). Find b. ans.(a) 15.(p-x)/(q+x)=2. (p…)/(q+x)= some value. Ans. (d) none of these. 16.There are four consecutive even integers. Their average is 12. can u find the no.s then two statements which I have forgotten. Ans.(a) 17.There was a reading comprehension. One question was to give a suitable title for the passage. There were 3 other questions from the same passage. 21..Data interpretation. there was a bar chart given for the production and consumption of oil of 6 or 7 countries. There were 6 questions based on the chart.i don’t remember the questions exactly. But I remember the ans of some which I am giving. Ans of first question was 3/2. Ans of 2nd ques was 40. Ans of 4th was finland.

27. unit of luminous intensity. Ans candela. 28.Find the value of [(1/99)3+(1/100)3+(1/101)33*(1/99)*(1/100)*(1/101)]/[(1/99)2+(1/100)2+(1/101)2-(1/99)*(1/100)-(1/100)*(1/101)(1/101)*(1/99)] ans. (1/100)+(1/99)+(1/101). 28. A and B together do a work in 10 days. A is paid thrice than B. Equal wage is given for equal work. Then in how many days B can do the work alone? Ans. 40 days. 29. Subhas works 2 hrs. and Kiran works 5 hrs then half the work is completed. Then they work together for 3 hrs. then 1/20 of the work remains to be done. Then how much time will they take to complete the work alone? Ans. Subhas – 6hrs. KIran - 15 hrs. Then there were 6 questions on analytical reasoning. There is an island named kya kya. There only two kinds of people live one who ( aisa hi kuch tha bahut hi bakwas tha. Kuch samajh nahin aaya tah.) for this the BRM (ims) may be helpful. I am not able to recall rest of the questions. Now the technical part. I am giving the mechanical paper. The first three ques were on calculation of fits and tolerances 1.calculate basic deviation. 2.maximum clearance. 3.tolerance in clearance. The dimensions for shaft and hole were given in a picture.(FOR THESE QUESTIONS SEE THE CHAPTER DEALING WITH TOLERANCES IN V B Bhandari or KHURMI GUPTA) 4. The key used in slot is which fit? (a)interference, (b)shrink (c)clearance. I don’t know the ans. 5. What is the function of MIR command in CNC machine? Ans. To give mirror image along a particular axis. 6. What is the part in CNC machine which gives the exact position of the x and y coordinates.? Ans. Interpolater. 7. in an anthromorphic robot there are three motions of the wrist roll, yaw and pitch.

Determine which one is along x axis, which along y axis and which along z axis. There was a diagram of the cutting tool showing the shear angle and the rake angle. 8. what is the angle α? Ans. Rake angle. (THE ANGLE IS GIVEN AS α AND NOT γ. SO DO NOT CONFUSE IT WITH THE CLEARANCE ANGLE.) 9. what is the formula of the chip reduction coefficient? Ans. Cos(β-α)/sinβ. 10. the order of cope , drag and cheek in the process of moulding. (a) drag,cope,cheek (b) cope, cheek, drag. Etc. ans. Don’t know. 11. non consumable electrode id used in which welding? Ans. TIG welding. 12.In power plant, nuclear plant and space ship what is the method used for maintanence? (a) breakdown maintenance (b) preventive maintenance. Ans is most probably (a). 13. Internal gear cannot formed by?(a) shaping (b)broaching (c) milling Ans. Shaping. 14. Feed is not associated with any type of motion in which process? Ans. Broaching. 15. The no. of teeth in a milling cutter is 8. the feed per teeth is 0.1 mm. The cutter speed is 150 rpm. What is the table speed? Ans. 8*0.1*150=120mm/min. 16. If aspect ratio of something is more than 50 i.e. length>50*diameter, then by which method will u make the object? (a) drill with 1 mm diameter. (b) laser machining. (c) ultrasonic machining. Ans. (b) 17.Match the following. Isochoric Isentropic Isobaric Isothermal Don’t remember the answer.

throttling slow movement of piston in a cylinder. closed cylinder. etc.

18.The pitch of a screw in an interpolator is 2 mm. the thread is double start. And there are 200 holes. Find the BLU. Ans. (2*2)/200 = 20 micrometers.

19. Then a question on double acting compressor. There were some questions on assertion reasoning. Two statements are given . Then mark (a) if A and R are both correct and R is the correct explanation for it. I remember only two questions from there. 20. This question was regarding the insulation on a cylinder. Whether it has some critical radius for minimum heat transfer. 21. A bob is hung with a thread from the ceiling. Another bob moving at speed in x direction hits it. Then R . the momentum of both bobs is conserved in x direction. A. Kinetic energy of both bobs is conserved. 22. At the point of contact in the meshing of two gears what is same? (a) angular velocity (b) linear speed etc. Ans. (b).