Bangalore University 2005-2nd Sem B.E 1st/ -Elements of Civil Engg-y/ - Question Paper
N15/25 CIV13/23
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:lit type of
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oscillator.
(S Marks)
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(10 Marks)
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First/Second Semester B.E Degree Examination, July/August 2005
Common to all Branches except Architecture
[Max. Marks : 100
Time: 3 hrs.]
Note: 1. Answer any FIVE full questions.
- St. Missing data, if any, may be suitably assumed.
(5 Marks)
>ression
(5 Marks) (4 Marks)
ectrum
'6 Marks)
motion
3 Marks)
3. Draw neat sketches wherever necessary.
Explain the impact of infrastructure development on the socio-economic progress of the country. (8 Marks)
1. (a) (b)
Briefly explain the terms planning, scheduling and project management.
(3x4 Marks)'
2. (a) Explain in detail the properties and uses of stones (b)
(6+6 Marks) 'J
Explain the properties of fresh concrete and list specific uses of plain concrete and reinforced concrete. (4+4 Marks)
3- (a) What are composite materials ? List the uses of composite materials.
* Maries) |gj
ber in
(2+4 Marks)
. *
(b) What is a total station ? What are the advantages of using total station?
|
od. Marks) | ||||||||||||||
|
(2+4 Marks)
(c) Write a brief note on remote sensing and Geographic Information system (GIS).
(4+4 Marks)
4. (a) Define the following system of forces with anexample observed in real practice
i) Coplanar concurrent forces
ii) Non coplanar concurrent forces
iii) Non coplanar non concurrent forces (6 Marks)
(b) Define principle of transmissibility of forces and explain its limitation.
(4 Marks)
(c)
Five guv wires tied at a point and are pulled in radial directions, equally spaced from one another.' If the magnitude of pulls on three consecutive wires is 50kN, 70kN and 6CkN, determine the magnitude of pulls on two other wires. (10 Marks)
CorttcL... 2
5. (a) Explain with neat sketches the different types of supports used in practice.
(8 Marks)
/
(b) Determine the reactions at points A and B for the beam loaded as shown in fig. 1. (12 Marks)
6. (a) Differentiate between centroid and centre of gravity.
(3 Marks)
(b) Locate the centroid of a quarter circle of radius R from first principles.
(7 Marks)
(c) Locate the centroid of the shaded area shown in fig. 2
(10 Marks)
7. (a) Define polar moment of inertia and radius of gyration and mention their units.
(4 Marks)
UVla/
'**? 1- the moment of inertia of the area shown in fig 3 about the axes AB
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 |
" A SO t |
cS
tjl
so
rO
ll
.Q
(8+8 Marks)
s. actice.
(8 Marks)
hown in
12 Marks)
3 Marks)
8. (aJ Prove the relationship //. = ianip. if/i is coefficient of friction and <$ is angle of limiting friction. (a Marks)
7 Marks)
{bt Explain the terms angle of repose and cone of friction.
(6 Marks)
(c) Two blocks A and B weighing 2k N and l.okN are connected by a wire passing over a smooth frictionless pulley as shown in fig. 4. Determine the magnitude of force P required to impend the motion, taking p. = 0.2
 |
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(11 Marks)
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Marks)
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Marks)
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time: 3 hrs-1 |
NEW SCHEME
USN
/Second Semester B.E. Degree Examination, July/August 2005
Common to all branches
Basic Electrical Engineering
4 Marks?
s being sd and
5 Marks)
in.
3 Marks)
Note: A nswer any FIVE full questions.
Marks)
1. (a) Mention the three methods used to link conductors with flux to get induced i-o , i Ri e.m.f. Name the machine for which each is applicable. (6 Marks)
i,-.-. jx (5) The winding of an electromagnet is wound with 96 turns and has a resistance 50 ohms. The exciting voltage is 25Ov and the flux linking the coil is i<#v 5 mWb.-oFind the energy stored in the magnetic field. Then if the current is reversed in 0.1 sec, what emf is induced in the coil? (6 Marks)
(c) What is power factor in a.c. circuits? Distinguish between lagging;p.f. and _v?.;Jeading p.f. TWhich.of,the foUowingdevices work,atvv;,f r
i) Unity p.f. ii) Lagging p.f. iii) Leading p.f.
. iv) Electric iron v) Fluoroscent lamp vi) Incandescent lamp vfi) Condenser bank to improve p.f. viii) induction motor. (8 Marks)
2. (a) A current of average value 18.019A is flowing in a circuit to which a voltage of
peaH value 141.42 V is applied. Determine i)Z1 R JX ii) Power, y lags I , V by |i Radians; (6 Marks)
- (b) Three volatages are connected as shown in fig 1. If V0. = 17.32-f jlOV,
Vb = 301_80V, Vc = 15j_-100V.
Find i)Vj2 andiii)\34
[Max.Marks : 100
(6 Marks)
 |
|
10 Marks) |
I. H
(c) How is a current of 10A shared by tliree impedances Zi = 2 - J5f2,
*$ Z2 = 6.708| 26.56 and Zz 3 + ,J4~* all connected in parallel?
(8 Marks)
3 {a) Deduce the relationships for the line and phase values of voltage and current V'-.'jt/t in a 3 phase balanced i) star and ii) delta connections. (6 Marks)
(b) A 3-phase Y connected supply with a phase voltage of 230V is supplying a balanced A load. The load draws 15KW at 0.8 p.f. lagging. Find the line currents and the current in each phase of the load. What is load impedance per phase0 (6 Marks)
t
' (c) Power is measured in a 3 phase balanced load using two Wattmeters. The line ?'' voltage isj 400V. The load and its p.f. 'is so adjusted that the line current is always 10A. Find the reading of the Wattmeters when the p.f. is
i) unity u) 0.866 iii) 0.5 and iv) zero. (8 Maxfcs)
r
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V.S.'
i -S?
'' -iy
(b) Like a d.c. motor, induction motor also requires a starter. Why? Explain how Y - A starter results in smooth starting of induction motor. (6 Marks)
(c) A 3 phase induction motor with four poles is supplied from an alternator having six poles and running at 1000 RPM. Calculate (i) synchronous speed of the induction motor, (ii) Its speed when slip is 0.04 (iii) frequency of the rotor e.m.f. when speed is 600 RPM. (8 Maifa)
8. (a) Sketch one type of earthing and indicate why such earthing of electrical *>-- equipments is necessary. (6 Marks)
v (b) -With a schematic explain the working of a dynamometer Wattmeter. (6 Marks) (c) As applied to an energy meter give reasons for the following:
i) There is a permanent magnet surrounding a portion of the rotating disc.
V ii)
are cut on the disc, ring Is provided on the central limb of.the shunt,magnet.
. ,v . (8 Marks)
4. (a) Explain the principle of converting the internally induced a.c. voltage into d.c.
voltage in a d.c. generator (6 Marks)
(b) What is the necessity of a starter for a d.c. shunt motor even though it is self starting? What is the function of of i) No volt release and ii) Over load release in the three point starter? (6 Marks)
(c) A 440V d.c. shunt motor takes an armature current of 20A and runs at 500 r.p.m. The armature resistance is 0.6fi. If the flux is reduced by 30% and the torque is increased by 40%. What are the new values of armature current and speed? (8 Marks)
5. (a) Sketch N-I andT-I characteristics of D.C. i] series and ii) shunt motors. Mention
two applications of each motor. (6 Marks)
(b) Give reasons for the following in an alternator: -
i) Armature is stationary, field is rotating.
ii) Distributed winding is used instead of concentrated winding. (6 Marks)
(c) A 3 phase Y connected alternator driven at900 RPM is required to generate a line
voltage of 460V at 60 Hz on open circuit. The stator has two slots/pole/phase . and four conductor per slot. Calculate the number of poles and the useful
- flux per pole if the winding factor is 0.966. ,., , (8 Marks)
6. (a) In a: transformer, why V-i
i) There is a small current in the primary even when the secondary is open?
ii) Iron loss is constant but copper loss is variable
iil) The core is made up of laminations. 1 (6 M?rks)
(b) The primary winding of a transformer is connected to a 240V 50Hz, supply. The secondary winding has 1500 turns. If,the maximum value of the.core flux is 0.00207 Wb, determine i) the secondary induced emf ii) number of turns in the primary iii) core area of cross section if the flux density has a maximum value of 0.465 Tesla. (6 Marks)
(c) A 40 KVA transformer has a core loss of 450 W and a full load copper loss of 850W. If the load power factor is 0.8. calculate i)efficiency at full load ii) load at which copper loss is equal to iron loss iii) efficiency at this load. (8 Marks)
7. (a) There is no d.c. excitation in induction motor, developed in it? Indicate the significance of slip.
N15/25 CIV13/23
rW,%
us types of
(8 Marks)
:lit type of
(4 Marks)
oscillator.
(8 Marks)
5P- amp -
(10 Marks)
r.
s
USN
First/Second Semester B.E Degree Examination, July/August 2005
Common to all Branches except Architecture
[Max. Marks : 100
Time: 3 hrs.]
Note: 1. Answer any FIVE full questions.
- St. Missing data, if any, may be suitably assumed.
(5 Marks)
>ression
(5 Marks) (4 Marks)
ectrum
'6 Marks)
motion
3 Marks)
3. Draw neat sketches wherever necessary.
Explain the impact of infrastructure development on the socio-economic progress of the country. (8 Marks)
1. (a) (b)
Briefly explain the terms planning, scheduling and project management.
(3x4 Marks)'
2. (a) Explain in detail the properties and uses of stones (b)
(6+6 Marks) 'J
Explain the properties of fresh concrete and list specific uses of plain concrete and reinforced concrete. (4+4 Marks)
3- (a) What are composite materials ? List the uses of composite materials.
* Maries) |gj
ber in
(2+4 Marks)
. *
(b) What is a total station ? What are the advantages of using total station?
|
od. Marks) | ||||||||||||||
|
(2+4 Marks)
(c) Write a brief note on remote sensing and Geographic Information system (GIS).
(4+4 Marks)
4. (a) Define the following system of forces with an, example observed in real practice
i) Coplanar concurrent forces
ii) Non coplanar concurrent forces
iii) Non coplanar non concurrent forces (6 Marks)
(b) Define principle of transmissibility of forces and explain its limitation.
(4 Marks)
(c)
Five guv wires tied at a point and are pulled in radial directions, equally spaced from one another.' If the magnitude of pulls on three consecutive wires is 50kN, 70kN and 6CkN, determine the magnitude of pulls on two other Wires. (10 Marks)
5. (a) Explain with neat sketches the different types of supports used in practice.
(8 Marks)
/
(b) Determine the reactions at points A and B for the beam loaded as shown in fig. 1. (12 Marks)
6. (a) Differentiate between centroid and centre of gravity.
(3 Marks)
(b) Locate the centroid of a quarter circle of radius R from first principles.
(7 Marks)
(c) Locate the centroid of the shaded area shown in fig. 2
(10 Marks)
7. (a) Define polar moment of inertia and radius of gyration and mention their units.
(4 Marks}
UVla/
'**? 1- the moment of inertia of the area shown in fig 3 about the axes AB
 |
wi
 |
" A So t |
cS
"TV
Li
so
rO
ll
.Q
iJL (jLVtrve'rV or ~rnTn
(8+8 Marks)
s. actice.
(8 Marks)
hown in
12 Marks)
3 Marks)
8. (aJ Prove the relationship //. = ianip. if/i is coefficient of friction and <$ is angle of limiting friction. (a Marks)
7 Marks)
{bt Explain the terms angle of repose and cone of friction.
(6 Marks)
(c) Two blocks A and B weighing 2k N and l.okN are connected by a wire passing over a smooth frictionless pulley as shown in fig. 4. Determine the magnitude of force P required to impend the motion, taking p. = 0.2
Marks)
 |
F-r C.\Si OTvLw. |
mils.
Marks)
(11 Marks)
R<
|
Attachment: |
| Earning: Approval pending. |
