Showing posts with label aku question paper. Show all posts
Showing posts with label aku question paper. Show all posts
Sunday, 23 August 2015
Tuesday, 27 August 2013
FIELD MEASUREMENT (SURVEYING)
Aryabhatta Knowledge University
Sem. iv 2013 Time 3hr Full marks: 70
FIELD MEASUREMENT (SURVEYING)
Attempt any five questions in which question no 1 is
compulsory
1.
Choose the correct option of the following (any
seven)
(a)
The main principal of surveying is to work
(i)
From part to whole
(ii)
From whole to part
(iii)
From higher level to lower level
(iv)
From lower level to higher level
(b)
The angle of intersection of the two plane
mirrors of an optical square is
(i)
30°
(ii)
45°
(iii)
60°
(iv)
90°
(c)
The allowable length of an offset depends upon
(i)
The degree of accuracy required
(ii)
The method of setting out the perpendiculars and
nature of ground
(iii)
The scale of plotting
(iv)
all of the above
(d)
The correction for sag is
(i)
always positive
(ii)
always subtractive
(iii)
always zero
(iv)
sometimes additive and sometimes subtractive
(e)
Which of the following statements is incorrect ?
(i)
the true meridian at defend places are parallel
to each other
(ii)
the true meridian at any place is not variable
(iii)
the true meridian converges to a point in
northern and southern hemispheres
(iv)
the maps prepared by national survey departments
of any country are based on true meridian
(f)
The most reliable method of plotting a theodolite traverse is
(i)
by consecutive coordinates of station
(ii)
by independent coordinates of each station
(iii)
by plotting included angles and scaling off each
traverse leg
(iv)
by the tangent method of plotting
(g)
the prismatic compass and surveyor’s compass
(i)
give WCB (whole circle bearing ) of a line and
QB (quadrantal bearing)of a line respectively
(ii)
both give QB of a line and WCB of a line
(iii)
both give QB of a line
(iv) both
give WCB of a line
(h)
Which of the following is not the function of
levelling head?
(i)
To support the main part of the instrument
(ii)
To attach the theodolite to the tripod
(iii)
To provide a means for levelling the theodolite
(iv) None
of the above
(i)
The line normal to the plumb line is known as
(i)
Horizontal line
(ii)
Level line
(iii)
Datum line
(iv) Vertical
line
(j)
Which of the following is Lehmann’s rule of
plane tabling?
(i)
The location of the instrument station is always
distant from each of the three rays from the known points in proportion to
their distances
(ii)
When looking in the direction of each of the
given points, the instrument station will be on the right side of one ray and
on the left side of the other ray
(iii)
When the instrument station is outside the
circumscribing circle ,its location is always on the opposite side of the ray
to the most distant point as the intersection of the other two rays
(iv)
None of the above
2.
(a) work differentiate between plane surveying and
geodetic surveying
(b) What do you understand by accuracy and precision?
(c) A 30 m chain was found to be 12 cm too long after chaining a distance of 1750m .It was found to be 23cm too long at the end of day’s
work after chaining a total distance of 3600m . Find the true distance if the
chain was corrected before the commencement of the
3.
(a) What is offset ? What are the points to be
considered while selecting offsets
(b) With neat sketches ,explain any two methods of chaining along a sloping
ground
(c) In chaining a line ,what is the maximum slope (i) in degrees and (ii) as 1 in n , which can be
ignored if the error from the source does not exceed 1 in 1000 ?
4.
(a) Explain the following cases with neat
sketches :
(i)
Obstacles to ranging but not chaining
(ii)
Obstacles to both chaining and ranging
(b) AB is a chain line crossing a
lake , A and B are on the opposite side of a lake. A line AC , 800m long ,is ranged to the right of AB clear of
the lake . Similarly, another line AD , 1000m long ,is ranged to the left of AB
such that the points C , B and D are in the same line . the lengths of BC and BD are 400m and 600 m respectively .if
the chainage at A is 1200m, calculate
the chainage of B
5.
(a) What do you understand by local attraction ? What are the methods for
detecting and eliminating local attraction ?
(b) The following bearings are
observed in running a closed traverse:
|
Line
|
FB
|
BB
|
|
AB
|
71°05’
|
250°20’
|
|
BC
|
110°20’
|
292°35’
|
|
CD
|
161°35’
|
341°45’
|
|
DE
|
220°50’
|
40°05’
|
|
EA
|
300°50’
|
121°10’
|
Determine the correct magnetic bearing of the lines.
6.
(a) Explain how the procedure of reciprocal levelling
eliminates the effect of atmospheric refraction and earth’s curvature as well
as the effect of the line of collimation.
(b) From a running fly levels from a benchmark of RL 183.215 , the
following readings were obtained :
|
BS
|
1.215
|
2.035
|
1.980
|
2.65
|
|
FS
|
0.965
|
3.830
|
0.980
|
|
From the last position of the instrument, five pegs at 20m intervals are
to be set out on a uniform rising gradient of 1 in 40 ; the first peg is to
have an RL of 181.580 .work out the staff readings required for setting the tops of the pegs on
the given gradient
7.
(a) What are temporary adjustments of the
instrument ? Explain in brief. Why is it necessary?
(b) Explain how you would take field observations with a theodolite so as
to eliminate the following:
(i) Error due to eccentricity of verniers
(ii) Error due to non adjustment of line of sight
(iii)
Error due to nonuniform graduation
(iv)
Index error of vertical circle
(v)
Error due to slip
8.
(a) Define the following
(i)
Counter line
(ii)
Contour interval
(iii)
Horizontal equivalent
(b) What are the characteristic
of contour lines?
(c) List the names of methods
employed for solving three-point problem
.Describe any one in detail
9. Write short notes on any four
of the following
(a) Tape correction
(b) Optical square
(c) Diagonal scale
(d) Dumpy level
(e) plane table surveying
Wednesday, 21 August 2013
DATABASE SYSTEMS
Aryabhatta Knowledge University
Sem. iv 2013 Time 3hr Full marks: 70
DATABASE SYSTEMS
Attempt any five questions in which question no 1 is
compulsory
1.
Choose the correct option (any seven) :
(a)
In SQL, SELECT is a
(i)
DDL command
(ii)
DML command
(iii)
DCL command
(iv)
TCL command
(b)
Primary key never takes
(i)
Date
(ii)
NULL
(iii)
Constant value
(iv)
NOT NULL
(c)
What is the maximum number of functional
dependencies (trival and non-trivial) of a relation R of degree n?
(i)
2n
(ii)
22n
(iii)
n!
(iv)
2n
(d)
In SQL, UPDATE clause changes
(i)
The value of attributes
(ii)
The name of columns
(iii)
The name of table
(iv)
None of the above
(e)
Second normal form never supports
(i)
Transitivity relation
(ii)
Multivalued attribute
(iii)
Partial dependencies
(iv)
None of the above
(f)
From a relation ‘π’operator selects
(i)
Row
(ii)
Attribute
(iii)
Domain of attribute
(iv)
Name of relation
(g)
What are the components of an ER model?
(i)
Entities
(ii)
Attributes
(iii) Relationships
(iv) All
of the above
(h)
What is the RDBMS terminology for column or
field ?
(i)
Tuple
(ii)
Relation
(iii) Attribute
(iv) Domain
What is the name of the attribute or attribute
combination of one relation whose values are required to match those values are required to match
those of the primary key of same other relation?
(i)
Primary key
(ii)
Candidate key
(iii) Attribute
(iv) Domain
(i)
When all the columns in a table fully
functionally depend upon the primary key, the table is said to satisfy the –
normal form.
(i)
First
(ii)
Second
(iii)
Third
(iv)
Fourth
2.
(a) what
are database system ? what are the
characteristic that distinguish a DBMS
from traditional file processing system?
(b) Explain the elements of a database with the help of a neat diagram.
3.
A university registrar office maintains data
about the following entities:
·
Courses
including number ,titles ,credits,syllabusand prerequisites
·
Courses
_offering including course _no ,year ,semester , section_no ,instructor ,
timings and classroom
·
Students
including student _id ,name and program
·
Instructor
including identification_no ,name, department, and title
Further the enrolment of students in courses and grades awarded to
students in each courses and grades awarded to students in each courses they
are enrolled for must be modelled .construct an ER diagram for the diagram for
the registrar ‘s office and document all assumptions that you make about the
mapping constraints.
4.
Consider the databse below and express the
queries in SQL:
Employee
(person-name,street ,city)
Works (person-name
,company-name ,salary)
Company(company-name,city)
Manages(person-name
,manager-name)
(a)
Find the names of all employees in this database who live in the
same city as the company for which they work.
(b)
Find the names of all employees who live in the
same city and on the same street as do their managers.
(c)
Find the names of all employees who earn more
than every employee of ‘Aije Bank Ltd.’
(d)
Find all companies located in every city in
which ‘Rural Bank (India)’is located.
(e)
Give the
managers a 10 percent salary raise, whose salary is greater than 50,000 and for
others, give only a 3 percent raise.
5.
(a) what is query tree ? when is it required ?
construct a query and generate a query tree for that.
(b) suppose a relation R with
attributes A,B,C and D. For the set of FDs,C→D,C→A, B→C.Identify the best normal form thatR satisfies
6.
(a) show with example that ‘not exits’ keyword
can be used to implement division operaor in SQL.
(b) write a short note on integrity constraints.
7.
(a) discuss the ‘insertion anomalies’, ‘updation
anomalies’ and ‘deletion anomalieswith
respect to normal forms with suitable example and suggest a method to overcome
them.
(b) discuss the problem of spurious tuples and state how we may prevent
it.
8.
(a)what do you mean by ACID properties of a
transaction? Explain the usefulness of each with example.
(b) explain the distinction between serial schedule and serializable
schedule.
(c) given a schedule S. Test for conflict and with serializability:
T1
T2 T3
Read(Q)
Write (Q) read(Q)
Write
(Q)
Write (Q)
9.
Write short notes on:
(a)
Specialization and generalization
(b)
Ternary relationship and Aggregation
(c)
Mapping cardinalities
(d)
Derived attribute
ELECTRICAL MACHINE-1
Aryabhatta Knowledge University
Sem. iv 2013 Time 3hr Full marks: 70
ELECTRICAL MACHINE-1
Attempt any five questions in which question no 1 is
compulsory
1.
Choose the correct option (any seven) :
(a)
Three –phase alternators are invariably
connected in star so as to
(i)
Reduce the size of stator conductors used
(ii)
Increase the terminal voltage
(iii)
Reduce magnetic losses
(iv)
All of the above
(b)
The phase sequence of a three-phase alternator
will reverse ,if
(i)
The field current is reversed keeping the
direction of rotation same
(ii)
The field current remains the same but direction
of rotation is reversed
(iii)
The field current is reversed and the number of
poles is doubled
(iv)
The number of poles is doubled without reversing
the fields current
(c)
The regulation of an alternator of an alternator
is given as
(i)
100(V-E˳)/V
(ii)
100(E˳-V)/V
(iii)
100V/E˳
(iv)
100(E-V)/E˳
(d)
In the measurement of Xd ,Xq
(in ohms), following data are obtained by the slip test on salient pole
machine:
Id max=10A ,
Id min=6.5A ,Vd
max=30 V ,Vd min=25 V
Which one of the following is correct?
(i)
Xd=3Ω ,
Xq =3.86Ω
(ii)
Xd=4.165Ω , Xq=2.5Ω
(iii)
Xd=3
Ω , Xq=2.5Ω
(iv)
Xq=4.16Ω ,
Xq=3.86Ω
(e)
In which of the following is reluctance power is
developed?
(i)
Salient pole alternator
(ii)
Non salient pole alternator
(iii)
Squirrel cage induction motor
(iv)
Transformer
(f)
Which motor can conveniently operate at lagging
as well as leading power factor?
(i)
Squirrel-cage induction motor
(ii)
Wound-rotor induction motor
(iii)
Synchronous motor
(iv)
Dc shunt motor
(g)
An inverted V curve of synchronous motor shows
the variation of
(i)
Power factor and DC excitation at constant load
(ii)
Supply voltage and field current at constant
excitation
(iii)
Power factor and supply voltage during hunting supply
voltage and excitation current at constant load
(h)
A single-phase induction motor is running at N
r.p.m. Its synchronous speed is Ns .if its slip with respect to
speed is s, what is the slip with respect to the backward field?
(i)
S
(ii)
–s
(iii)
(1-s)
(iv) (2-s)
(i)
The torque-speed characteristic of two- phase
induction motor is largely affected by
(i)
Voltage
(ii)
Speed
(iii)
X/R ratio
(iv) Supply
frequency
(j)
In a.c. series motors, armature coils are
usually connected to commutator
(i)
Through resistor
(ii)
Through inductors
(iii)
through capacitors
(iv)
solidly
2.
(a) draw the following phasor diagram of a 3
phase synchronous machine:
(i)
Type: non salient pole , mode generator ,
pf-lagging
(ii)
Type : salient pole ,mode motor ,pf –leading
(iii)
Type : non –salient pole, mode motor ,pf-
leading
(b) a 3 phase ,10 kVA ,400 V ,star connected
alternator supplies the rated load at 0.8 p-f
lagging. If the armature resistance is 0.5 ohm and synchronous reactance
is 10 ohms , find the torque angle and voltage regulation.
3.
(a) from the phasor diagram of a salient –pole
alternator working at a leading pf , but with pf angle θ less than load angle δ
,obtain the following relation:
(i)
Tan(δ-θ)=
[ia Xq –Vt sinθ]/[Vtcosθ+Ia
ra ]
(ii)
Ef =Vt cosδ+Ia
ra cos(δ-θ)+Id Xd
(b)
Find excitation voltage of an alternator when
delivering rated output at 0.8 pf lagging and at a rated voltage. For this
alternator, Xd =1discuss the effects.25p.u. and Xq=1.00
p.u.
4.
Show that for alternators running in parallel
,the division load between them is governed mainly by the speed- load
characteristics of their prime movers
5.
(a) discus the effects of field current on
synchronous motor power factor with the
help of
phasor diagram.
(b) prove that power develop in three-phase synchronous motor is given by
P=3[EfVt sinδ/Xd +(1/2)Vt2
(1/Xq-1/Xd)sin2δ]
6.
(a) Derive the equivalent circuit of a
single-phase induction motor with the
help of double revolving field theory .
(b) A –pole ,50 Hz ,ingle –phase induction motor ,when running at normal
speed, has forward field and backward field resistance of 60 ohms and 1.4 ohms respectively
. The stator current at a full -load slip of 5% is 3A. Determine the full load
torque in N-m.
[Assume rotational losses to be 4 % of the internal power developed]
7.
A 2-phase ,4-pole servomotor has the following
parameters at 50Hz :
R1=360 ohms, r2=250 ohms, x1=x2
=50 ohms, xm=900 ohms
This motor is operated with 115 V across the control winding and 75 V
across the control winding, the latter leading the former by 90°.
Calculate the stator currents ,output power and motor torque at a slip of
0.5 .the rotational losses under condition given above are 0.7 watt .both the
windings have equal no of turns.
8.
(a) Give the constructional features, working
and application of single –phase reluctance motors.
(b) Describe the working of single sub –synchronous motor. Why should its
rotor posses considerable flywheel effect?
9.
Write short notes on any two of the following :
(a)
Permanent magnet Dc motor
(b)
Hysteresis motor
(c)
Starting of synchronous motor
(d)
Two- reaction theory in salient pole synchronous
generator
ELECTRICAL MACHINE -II
Aryabhatta Knowledge University
Sem. iv 2013 Time 3hr Full marks: 70
ELECTRICAL MACHINE
-ii
Attempt any five questions in which question no 1 is
compulsory
1.
Choose the correct option (any seven) :
(a)
Three –phase alternators are invariably
connected in star so as to
(i)
Reduce the size of stator conductors used
(ii)
Increase the terminal voltage
(iii)
Reduce magnetic losses
(iv)
All of the above
(b)
The phase sequence of a three-phase alternator
will reverse ,if
(i)
The field current is reversed keeping the
direction of rotation same
(ii)
The field current remains the same but direction
of rotation is reversed
(iii)
The field current is reversed and the number of
poles is doubled
(iv)
The number of poles is doubled without reversing
the fields current
(c)
The regulation of an alternator of an alternator
is given as
(i)
100(V-E˳)/V
(ii)
100(E˳-V)/V
(iii)
100V/E˳
(iv)
100(E-V)/E˳
(d)
In the measurement of Xd ,Xq
(in ohms), following data are obtained by the slip test on salient pole
machine:
Id max=10A ,
Id min=6.5A ,Vd
max=30 V ,Vd min=25 V
Which one of the following is correct?
(i)
Xd=3Ω ,
Xq =3.86Ω
(ii)
Xd=4.165Ω , Xq=2.5Ω
(iii)
Xd=3
Ω , Xq=2.5Ω
(iv)
Xq=4.16Ω ,
Xq=3.86Ω
(e)
In which of the following is reluctance power is
developed?
(i)
Salient pole alternator
(ii)
Non salient pole alternator
(iii)
Squirrel cage induction motor
(iv)
Transformer
(f)
Which motor can conveniently operate at lagging
as well as leading power factor?
(i)
Squirrel-cage induction motor
(ii)
Wound-rotor induction motor
(iii)
Synchronous motor
(iv)
Dc shunt motor
(g)
An inverted V curve of synchronous motor shows
the variation of
(i)
Power factor and DC excitation at constant load
(ii)
Supply voltage and field current at constant
excitation
(iii)
Power factor and supply voltage during hunting supply
voltage and excitation current at constant load
(h)
A single-phase induction motor is running at N
r.p.m. Its synchronous speed is Ns .if its slip with respect to
speed is s, what is the slip with respect to the backward field?
(i)
S
(ii)
–s
(iii)
(1-s)
(iv) (2-s)
(i)
The torque-speed characteristic of two- phase
induction motor is largely affected by
(i)
Voltage
(ii)
Speed
(iii)
X/R ratio
(iv) Supply
frequency
(j)
In a.c. series motors, armature coils are
usually connected to commutator
(i)
Through resistor
(ii)
Through inductors
(iii)
through capacitors
(iv)
solidly
2.
(a) draw the following phasor diagram of a 3
phase synchronous machine:
(i)
Type: non salient pole , mode generator ,
pf-lagging
(ii)
Type : salient pole ,mode motor ,pf –leading
(iii)
Type : non –salient pole,mode motor ,pf- leading
(b) a 3 phase ,10 kVA ,400 V ,star connected
alternator supplies the rated load at 0.8 p-f
lagging. If the armature resistance is 0.5 ohm and synchronous reactance
is 10 ohms , find the torque angle and voltage regulation.
3.
(a) from the phasor diagram of a salient –pole
alternator working at a leading pf , but with pf angle θ less than load angle δ
,obtain the following relation:
(i)
Tan(δ-θ)=
[ia Xq –Vt sinθ]/[Vtcosθ+Ia
ra ]
(ii)
Ef =Vt cosδ+Ia
ra cos(δ-θ)+Id Xd
(b)
Find excitation voltage of an alternator when
delivering rated output at 0.8 pf lagging and at a rated voltage. For this
alternator ,Xd =1discuss the effects.25p.u. and Xq=1.00
p.u.
4.
Show that for alternators running in parallel
,the divison load between them is governed mainly by the speed- load
characteristics of their prime movers
5.
(a) discus the effects of field current on
synchronous motor power factor with the
help of
phasor
diagram
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