Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU)) B-Tech 1st Semester (First Semester) 2018-2019 Basic Electrical Engineering Question Paper
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BTECH '
(SEM 1) THEORY EXAMINATION 2018-19
BASIC ELECTRICAL ENGINEERING
Time: 3 Hours. Total Marks?doo
Note: [The question paper contains three sections- A, B & C.
2. Read the instructions care?llly in each section
3. Course outcome(C0) has been mentioned against each question.
SECTION-A
l. Attempt ALL:~ [211%20]
:1. De?ne with examples: (i) Active and passive element (ii) bilateral and unilateral
elements. ' (CO 1)
b. Explain (i) Ideal current source (ii) ideal voltage source. (CO I)
A series circuit has R= 100, L= 0.02H andGF 3pF. Calculate Q-factor of the circuit.
(CO 2)
d Two ac currents one represented as 11 = 25 sin ( \ 20?) & i2 = 35 sin (314 t +
45"). Draw the phasor & show the resultant n ey are connected in parallel. 337:) ? . _
\
?<3?? (c0 ?if ?
What will happen if the primary of awrmer is connected to dc supply? (C
How can we change the directing S??mation of DC motor? $0 4)
Enlist the various methods 0 mg of single phase inductionvmotor???\ ~ (CO 4)
5?-
ran?.
Why Earth pin is made t? and bigger than line and neutral? R (CO 5)
What are the Mung; of auto-transfonner over two windin%2?kfonner? (CO 4)
J2 Calculate the energy consumption per day in a house uy?g ? FLs of 20 W each, 3
?.
fans of 60 w each for 3 hrs a day. (?2; } (c0 5)
, Q ?
SECTION- B {b l
2. Attempt any three parts of the following. Eng?!? carries 10 marks. [3x1th30]
(a) Find current through 20 resistance using in sition theorem in ?gure 1 (C0!)
. 1
2 n 69
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11V
t O
A 0 ? n 109
Figure 1
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s is 12v. ?V I (C05)
(b) Derive expression of resonance frequency for series RLC circuit, A series circuit
consists of a resistance of 109, and inductance of 5011111 and a variable capacitance in series
across a 100V, 50Hz supply. Calculate- ,
(i) The value of capacitance to produce resonance.
(ii) Voltage across the capacitance.
(iii) Q- factor (C02)
(c) The maximum ef?ciency of a mo KVA,1100/440 V 50 Hz transformer is 96%, This
occurs at 75% of full load at 0.8 p.f. lagging. Find the efficiency of transformer at 34 FL at
0.6 p.f. leading. ' (CO3)
(d) A 4-poie shunt generator with lap-connected armature has ?eld and armature resistance of
500 and 0.19 respectively. If supplying power to 100W lamp load for 100 V. Calculate the
almature current and the generated emf. Consider a contact dxbp of IV per brush. (CO4)
(e) Draw the characteristics of battery.
Calculate the backup of battery of lOOAH connec?d to load of 100 watts and supply voltage
Pa
SECTION: $3 gt?) ?-
3. Attempt any ONE question: Q? ' ? [lOXl?gx
(a)Give the statement of Norton?s TheoreQSQ (gm
" h ? f .
Find the current in 12 ohm resis . . $1; Nogon?s theorem for the given CRIN.
5 .
A
. Figure 2 \32 ..
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4. Attempt any ONE question:\\ _ [10X1=10]
(a)Derive the expression for resonmt frequency & quality factor for an ad: circuit under the
condition of parallel resonance. (CO 2)
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(b)Derive the relation between line current & phase current in case of three phase delta
connected balanced load. Three identical coils of resistance 80 and inductive reactance 60
are connected in delta across 400V mains. Determine power, power factor and line current.
Draw phasor diagram. (CO 2)
5. Attempt any ONE question: [10Xl=10]
(21) Discuss the principle of operation of a single phase transformer. Derive EMF equation for
a single phase transfonner? (CO 3)
(b) What is voltage Regulation in a single Phase Transformer? What should be its value for
an ideal transformer? (CO 3)
6. Attempt any ONE question: [10X1=10]
(a) Derive the EMF equation of DC. Generator. An 8 pole ?Wound dc generator has 450
armature turns? It operates at 0.02 wb flux per pole and r t 1000 rpm at no load. F ind the WK . e.
emf induced by it. (CO 4) ?;iy
(b)What is the relation between frequencies $211 & rotor currents? A 3-phase, $31 ?
induction motor has 6 poles and operates @slip of 5% at a certain load. Detem?gg g _
(i) The speed of rotor WW? to the stator. f?\??
(ii) The frequency of 1&1?53): current. RN
(iii) The speed okh?or magnetic field with respect to the Nor. (CO 4)
\ Ex
7. Attempt any ONE question: 4:? ? [10x1=101
(a)Write short notes on the following: {2} ? (CO 5)
(i) MCB (ii) MCCB (c) Fuse (d) Types of wi;%
(b) Explain following: {?23:} \ (CO 5)
(i) Need of Eanhing ,1? , 3/
(ii)Battcry backup Qg?w
x.
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This post was last modified on 29 January 2020