B.Tech. [SEM IV (ME)] QUIZ TEST-1 - being mechanical -...

EEE-409/Ms.Gita Devi/Mr.Gaurav pandey Date: 26 /02 /2011

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SHRI RAMSWAROOP MEMORIAL COLLEGE OF ENGG. & MANAGEMENT

B.Tech. [SEM IV (ME)] QUIZ TEST-1

(Session : 2010-11)

Electrical Machine &Automatic control (EEE-409)

Roll No.

(To be filled by the Student) Note:

Part – A (Questions from Tutorial Sheet)

[10 Marks] Q1) Explain how e.m.f is induced in a winding of transformer. Derive its e.m.f equation. (Que.1) [2+3]

Q2) Discuss 3 to 6-phase conversion and give some practical application.(Que.5) [5]

Part – B

[20 Marks] Q1) A series motor having resistance of 1Ώ between its terminals drives a fan, the torque of which is proportional to the square of the speed. At 230 V, its speed is 300 rpm and takes 15 A .The speed of the fan is to be raised to 375rpm by supply voltage control .Estimate the supply voltage required.[7] Q2) The autotransformer used to supply a load of 2Kw at 230 V from a 400 V a.c. supply. Find the current in parts AC and BC , neglecting loses and no load current .Also find the copper saving due to the use of autotransformer instead of using two winding transformer and the efficiency at full load ,0.8 p.f .if the core loss is 150 W and full load copper loss 275 W .Assume purely load. [1+3+3] Q3) Sketch and explain the speed –current ,speed –torque and torque –current characteristics of a shunt motor ,series motor and compound motor. [2+2+2]

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Academic/26 Refer/WI/ACAD/18

Time: 1 Hour Max. Marks: 30


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(Session : 2010-11)


Roll No.



[10 Marks] Q1) Draw the Scott connection of transformers and mark the terminal and turn ratio.(Que.2) [5] Q2) A 100 V series motor when taking 40 A runs at 200 r.p.m. The armature resistance is 0.1Ω and there are four field coils, each of 0.01Ω in series with it. Find the speed if the load torque be doubled and the coils arranged in series-parallel (two in series, two sets in parallel)..(Que.8) [5]

Part – B

[20 Marks] Q1)In a particular dc machine ,if P = 8,Z = 400, N= 300 rpm and Φ= 100 mWb,calculate generated emf .if winding is connected in(i)lap winding (ii)Wave winding . [3.5+3.5] Q2) The autotransformer used to supply a load of 2Kw at 230 V from a 400 V a.c. supply. Find the current in parts AC and BC , neglecting loses and no load current .Also find the copper saving due to the use of autotransformer instead of using two winding transformer and the efficiency at full load ,0.8 p.f .if the core loss is 150 W and full load copper loss 275 W .Assume purely load. [1+3+3] Q3) Sketch and explain the speed –current ,speed –torque and torque –current characteristics of a shunt motor ,series motor and compound motor. [2+2+2]

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(Session : 2010-11) Electrical Machine &Automatic control

(EEE-409)

Roll No.



[10 Marks] Q1) A 200 kVA,2000/400 V,50 Hz single-phase transformer gave the following test result :

O.C.test : 2000V, 1.8A 1.75 kW … ……..on H.V.side S.C test : 13V, 300A, 1kW …………...on L.V.side Obtain the equivalent circuit as referred to H.Vside. .(Que.10) [5]

Q2) Derive an expression for the saving of copper in auto-transformers as compared with an equivalent two winding transformer.(Que.3) [5]

Part – B

[20 Marks] Q1) A series motor having resistance of 1Ώ between its terminals drives a fan, the torque of which is proportional to the square of the speed. At 230 V, its speed is 300 rpm and takes 15 A .The speed of the fan is to be raised to 375rpm by supply voltage control .Estimate the supply voltage required.[7] Q2) In a particular dc machine, if P = 8,Z = 400, N= 300 rpm and Φ= 100 mWb,calculate generated emf .if winding is connected in(i)lap winding (ii)Wave winding . [3.5+3.5] Q3) Sketch and explain the speed –current ,speed –torque and torque –current characteristics of a shunt motor ,series motor and compound motor. [2+2+2]

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(Session : 2010-11)


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[10 Marks] Q1) A 200 kVA transformer has an efficiency of 98% at full load. If the maximum efficiency occurs at three quarters of full load, calculate the efficiency at half load .Assume negligible magnetizing current and power factor of 0.8 at all loads.(Que.4) [5] Q2) Why Starting current is high in dc motor? Explain the working of a four-point starter for a dc machine. (Que.7) [1+4]

Part – B

[20 Marks] Q1) A series motor having resistance of 1Ώ between its terminals drives a fan, the torque of which is proportional to the square of the speed. At 230 V, its speed is 300 rpm and takes 15 A .The speed of the fan is to be raised to 375rpm by supply voltage control .Estimate the supply voltage required.[7] Q2) In a particular dc machine, if P = 8,Z = 400, N= 300 rpm and Φ= 100 mWb,calculate generated emf .if winding is connected in(i)lap winding (ii)Wave winding . [3.5+3.5] Q3) Sketch and explain the speed –current ,speed –torque and torque –current characteristics of a shunt motor ,series motor and compound motor. [2+2+2]

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(Session : 2010-11)


Roll No.



[10 Marks] Q1) Explain Ward Leornad method of speed control for dc motors.(Que.6) [5] Q2) A 440 V d.c series motor of negligible resistance and with unsaturated magnetic circuit takes 50 A when running at a certain speed on a given load. If the load torque varies as the cube of the speed, find the resistance necessary to reduce the speed by 50%.What is then the current?(Que.9)

[5] Part – B

[20 Marks] Q1) The autotransformer used to supply a load of 2Kw at 230 V from a 400 V a.c. supply. Find the current in parts AC and BC , neglecting loses and no load current .Also find the copper saving due to the use of autotransformer instead of using two winding transformer and the efficiency at full load ,0.8 p.f .if the core loss is 150 W and full load copper loss 275 W .Assume purely load. [1+3+3] Q2) In a particular dc machine, if P = 8,Z = 400, N= 300 rpm and Φ= 100 mWb,calculate generated emf .if winding is connected in(i)lap winding (ii)Wave winding . [3.5+3.5] Q3) Sketch and explain the speed –current ,speed –torque and torque –current characteristics of a shunt motor ,series motor and compound motor. [2+2+2]

__________X__________



EEE-409/Ms.Gita Devi/Mr.Gaurav pandey Date: 17/03 /2011

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(Session : 2010-11)


Roll No.



[10 Marks] Q1) Show that the magnetic field produces in the air gap of three phase induction motor is of rotating in nature.

Give the expression of speed in terms of poles and frequency supply. (Que.1) [4+1] Q2) What is V-curve of synchronous motors and various application synchronous motor. (Que.7) [3+2]

Part – B

[20 Marks] Q1) A 3-phase,8 pole star connected a.c generator is driven at 900 rpm. The armature coils are short chorded by one slot ,the coil span being 165 degree electrically. Determine the induced e.m.f across terminals of the alternator if there are 12 conductors per slot and flux per pole 50mWb distributed sinusoidally. [2+2+3] Q2) A 25 KW ,4 pole 3 phase ,50 Hz induction motor is running at 1410 r.p.m, supplying full load .The mechanical losses are 850 W and stator losses are 1.7 times rotor copper losses on full load. Calculate,

i) Gross mechanical power developed ii) Rotor copper losses iii) The value of rotor resistance per phase if rotor current on full load per phase is 65 A. iv) The full load efficiency. [2+2+2+2]

Q3) State the advantages of revolving field type synchronous generator over revolving armature type synchronous generator. [5]

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(Session : 2010-11)


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[10 Marks] Q1) . A500 V, 6 pole, 50 Hz induction motor develops 20 h.p inclusive of mechanical losses, when running at 995 r.pm. The power factor of the motor is .87lag.Calculate (a) slip (b)rotor copper loss(c) total input losses are1500 w(d) line current. (Que.4) [1+1+1+2] Q2). Describe experimental method of determination of voltage regulation of a 3 phase synchronous generator

following synchronous impedance method. (Que.10) [5]

Part – B [20 Marks]

Q1) A 3-phase,8 pole star connected a.c generator is driven at 900 rpm. The armature coils are short chorded by one slot ,the coil span being 165 degree electrically. Determine the induced e.m.f across terminals of the alternator if there are 12 conductors per slot and flux per pole 50mWb distributed sinusoidally. [2+2+3] Q2) A 25 KW ,4 pole 3 phase ,50 Hz induction motor is running at 1410 r.p.m, supplying full load .The mechanical losses are 850 W and stator losses are 1.7 times rotor copper losses on full load. Calculate,



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(EEE-409)

Roll No.



[10 Marks] Q1). Draw torque slip characteristic of a typical three phase induction motor and explain how torque varies with

rotor resistance. (Ques.2) [5] Q2). Explain the operating principle of two phase a.c Servomotor and draw the torque speed characteristic. (Ques.9) [5]

Part – B




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(Session : 2010-11)


Roll No.



[10 Marks] Q1) Torque of a 3 phase,8 pole,50 Hz induction motor is 190 N-m..The rotor frequency is 1.5 Hz. Calculate the rotor copper losses if mechanical losses are 700 watts. (Ques.3) [5] Q2) Explain the phenomenon of hunting as applied to synchronous motor and how it can be reduced. (Ques.8) [1+4]

Part – B




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(Session : 2010-11)


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[10 Marks] Q1) Explain the phasor diagram of a loaded alternator: (a)Lagging power factor (b) Leading power factor (c) Unity factor (Que.6) [2+2+1] Q2) Derive the e.m.f equation of synchronous alternator and explain the armature reaction of the same. (Que.5)

[3+2]


Q1) A 3-phase,8 pole star connected a.c generator is driven at 900 rpm. The armature coils are short chorded by one slot ,the coil span being 165 degree electrically. Determine the induced e.m.f across terminals of the alternator if there are 12 conductors per slot and flux per pole 50mWb distributed sinusoidally. [2+2+3] Q2) A 25 KW ,4 pole 3 phase ,50 Hz induction motor is running at 1410 r.p.m, supplying full load .The mechanical losses are 850 W and stator losses are 1.7 times rotor copper losses on full load. Calculate,


Q3) State the advantages of revolving field type synchronous generator over revolving armature type synchronous generator.

[5]

__________X__________



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Academic/26

Refer/WI/ACA D/18

SHRI RAMSWAROOP MEMORIAL COLLEGEOF ENGG. & MANAGEMENT

B.Tech. [SEM IV (ME)IQUIZ TEST-3

(Session: 2010-11)

Time: / Hour Electrical Machine &Automatic. control(EEE-409)

.

Mu:. Mark...: ]()

1Roll No.

Note: attempt all questions:

Part - A(Questions from Tutorial Sheet)

(To be filled 11.1'the Student)

[10 Marks]Q1) A certain system is described by a differential equation ~"

d2y(t)/ dt2 +3dy(t)/ dt +l1y(t) = 5x(t) Where y(t) is the output and the x(t) is the input. Obtain

the transfer function of the system. (Que;7) [5J

Q2) The figure shows F-I analogous electrical network for translational mechanical system. Draw the

mechanica~ syste~. (Que.4) ~ lYU))~

0~) ~ BIcY p-,)

Part - B

Q1) Explainthe feedbackcontrolof missile launchingsystem.

Q2) Obtain the transfer function of lead network shown below.

. r-c:Je.,~L\) G

~v- (,0 l-\-)

Q3) Draw the analogous electrical networks based ona) Force Voltage analogy.

b) Force Curre~t analogy of the the follo~ing mechanical system. -:>Il; .~>t'\ '

~ ~ K2,' ! ktt~ H2J. M3

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q~ll/,))

[5J

[20 Marks]/51

/

( [5]

:-,>?l1 [5+5J1

~) ~l.y

/r('~

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I

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Academic/26Refer/WI/ACAD/18

SHRI RAMSWAROOP MEMORIALCOLLEGEOF ENGG. & MANAGEMENT

B.Tech. [SEM IV (ME)]QUIZ TEST -3

(Session: 2010-11)

..

Time: 1 Hour Electrical Machine &Automatic control(EEE-409)

Max. Mark\': 30

Roll No.

Note: attempt all questions:(To be filled by Ihe Slut/em)

Part - A(Questionsfrom Tutorial Sheet) t

[10 Marks][5]Ql) Explain the Servomechanism with scheme of positional control system (Que-.lO)

Q2). For a system shown in the fig., calculate its transfer function where Vo(t) is output and Vi(t) is

input to the system. b (Que.l) [5]

c:;) -- ~

I

~Vo L+)

, ,~Part - B

[20 Marks]

Ql) Explain the feedback control of missile launching system. 151

[5]Q2) Obtain the transfer function of lead network shown below.

till

Q3)Draw the analogous electrical networks based ona) Force Voltage analogy.b) Force Current analogy of the the following mechanical system

, - ")'\L:1 I-!) "0L-L I

k~fY\, M'L-- "1-3

1 [5+5]

)-7 Kt

-J~tJ~

~ 6) K1- .8'1--~&3

~ --- ',.EEE-409/Ms.Gita Dc"i/Mr.Gaura" pandcyDatc: 09/04 /20II

Page-I

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Time: J Hour

B.Tech. [SEM IV (ME)IQUIZ TEST-3

(Session: 2010-11)

Electrical Machine &Automatic control(EEE-409)

..

Max. Marh: 3()

Roll No.

(To he.filled by the Student)


Part - A(Questionsfrom Tutorial Sheet)

Ql Obtain the analogous electrical network for the system given below: (Ques.5J//////./"'/.......

[10 Marks][5]

Q2) Explain the derivation of analogou

- ~ 'IL,\-

Force-current analogy

[2.5+2.5]

Part - B

Ql) Explainthe feedbackcontrol of missile launchingsystem.[20 Marks]

151

Q2) Obtain the transfer function of lead network shown below. [5]

Q3)Draw the analogous electrical networks based ona) Force Voltage analogy.b) Force Current analogy of the the following mechanical system,

\-) R.1.I

BL-L-

,/"

,~ "'-- '\--

k:~ I

, ,1-J.t.y

(" r-' r£££-409/Ms.Gita Devi/Mr.Gaul'av pandeyDale: 09/04/20 II . Page-l

[5+5]

-9'>-\31 '

H,!, J---", 1 (;f)

6

,..-' /'

DA'~~

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Time: 1 Hour

B.Tech. [SEM IV (ME)]QUIZ TEST-3

(Session: 20/0-//)

Electrical Machine &Automatic control(EEE-409)

.

Max. Marks: 30

Roll No.

(To bejilled by the Student)Note:


~~ [10 Marks]Ql) Draw the equivalent mechanical system and analogous systems based on F-V and F-I methods for

the given system. ? J, tH) ~ r~ (Ques.3) [2.5+2.5]\l1 ~ '1Lrl.f. )

I!>v

- --i- 'K.-, l.\-)

tc..'1---

.II 1/Q2) Define open loop and closed loop system by giving suitable examples. (Ques.6) [2.5+2.5]

Part - B

Ql) Explainthe feedbackcontrol of missile launchingsystem.[20 Marks][5][5]


~ 1t"r' ~ - h- - 1" L\-)Q3)The figure shown F-V analogous electrical network for translational mechanical system. Draw themechanical system with equilibrium equation. [5+5]

r--:-~' - .,I .. L-1 C, CYi4JC:!,cj~,

PV :J12-,

J L..-v-- t:'J-l'/I(1-]l./1

EEE-409/Ms.Gita Devi/Mr.Gaurav pandeyDate: 09/0412011

Page-I

E ,.~~~-"~~.it' \

(~ ~,J\.~..~~lr./!",-".."

SHRI RAMSWAROOP MEMORIAL COLLEGE OF ENGG. & MANAGEMENT.

Academic/26Refer/WI/ACADII8

B.Tech. [SEM IV (ME»)QUIZ TEST-3

(Session: 2010-//)

.

Time: 1 Hour Electrical Machine &Automatic control. ,

(EEE-409)Max. Mllrk.\\' 3(J

Roll No.

(To be filled by the SlUdellt)



~" [10 MarksJQl Draw the equivalent mechanical system of the given system and write the set of equilibrium

equations for it and obtain electrical analogous circuit using.

i) F-Yanalogy ii) F-I analogy ///.r- /.,r ~/ (Que.2) [2.5+2.5J

61- 1 ~\

~')...-

J,~tt4-)

~

Q2) Explain the significance of a transfer its advantage and features. (Que.S)[I +~+2J

Part - B

Ql) Explain the feedback control of missile launching system.[20 MarksJ15/[5J


~ CO Je3J~) ~ 1(('!-- eoL~JQ3)The figure shown F-V analogous electrical network for translational mechanical system. Draw themechanical system with equilibrium equation. [5+5J

~~<8

tI~ lYic:..V c3ci~3-"'"

~J

11'"

1- (:lYK,J

;:) '--,:--

£££-409/Ms.Gita Devi/Mr.Gaurav pandeyDate: 09 104 120 II

Page-l

EEE-409/Ms.Gita Devi/Mr.Gaurav pandey Date: 30/04 /2011

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(Session : 2010-11)


Roll No.

(To be filled by the Student) Note: attempt all questions:


[10 Marks] Q1) Define the following systems sketching their output waveform for a unit step input:

(i) Under damped system (ii) Undammed system (iii) Over damped system (Q.1) (iv) Critically damped system Q2) Starting from expression of C(t) for unit step of typical under damped second order system .Derive the expression for settling time. (Q.2) [5]

Part – B

[20 Marks] Q1)Sketch the polar plot of any two transfer function:

a) G(s)=1/s(1+sT) b) G(s)= s/1+st c) G(s)=1+4s /s2 (1+s)(1+2s) [8]

Q2) For a control system shown in figure,Find the value of K1 and K2 so that Mp=25% and Tp=4 sec.Assume unit step input. [6] G(s)=K1/s2 & H(s)=1+K2S Q3) A given system oscillates with frequency 2 rad/sec.Find values of Kmar and P.No of poles are in R.H.S [3+3] __________X__________




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(Session : 2010-11)


Roll No.



[10 Marks] Q1) Find the range of K so that the following system is stable- S4 + 7s3 + 10 s2 + 2Ks+ K = 0. (Ques.6) [5] Q2). Derive the expression for peak time and rise time in terms of ξ and Wn for second order control system. (Que.3) [5]


Q1)Sketch the polar plot of any two transfer function:


Q2) For a control system shown in figure,Find the value of K1 and K2 so that Mp=25% and Tp=4 sec.Assume unit step input. [6] G(s)=K1/s2 & H(s)=1+K2S Q3) A given system oscillates with frequency 2 rad/sec.Find values of Kmar and P.No of poles are in R.H.S [3+3]




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(EEE-409)

Roll No.



[10 Marks] Q1) State the advantages and limitation of Routh’s method (Ques.5) [5] Q2) Using Nyquist criterion investigate close loop stability of

G (S) H (s) = 2.5 (s+1) (s+0.5) (s-2)

(Ques.9) [2.5+2.5]


Q1)Sketch the polar plot of any two transfer function: a) G(s)=1/s(1+sT) b) G(s)= s/1+st c) G(s)=1+4s /s2 (1+s)(1+2s) [8]


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(Session : 2010-11)


Roll No.



[10 Marks] Q1) How Routh’s criterion can be used to study the relative stability? (Ques.9)

Q2) Using Nyquist plot and comment on range of K for stability of system with

G (S) H (S) = K__________ S (1+s) (1+ 2s) (1+3s)

(Ques.7) [2.5+2.5]


Q1)Sketch the polar plot of any two transfer function: a) G(s)=1/s(1+sT) b) G(s)= s/1+st c) G(s)=1+4s /s2 (1+s)(1+2s) [8]


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(Session : 2010-11)


Roll No.



[10 Marks] Q1) Derive the relationship between maximum overshoot and damping ratio of a second order system.Draw the graph of overshoot versus damping ratio. (Que.2) [2.5+2.5]

Q2) For a system G(s) h (s) = K Find the value of K to limit steady state error to S2 (s+2) (s +3)

when input to system is 1+10 t + 40/2 t2. (Ques.5)


Q1)Sketch the polar plot of any two transfer function:






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B.Tech. [SEM IV (ME)] QUIZ TEST-1 - being mechanical -...

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