Institute Of Engineering Studies Mock Test- I 1 No.1 Training center for GATE/IES/JTO/PSUs in Bangalore @ Malleshwaram & Jayanagar, Bangalore: Ph: 0 99003 99699/ 0 97419 00225 / 080-32552008 Email : [email protected]Site: www.onlineIES.comGoogle+: http://bit.ly/gplus_iesgate FB: www.facebook.com/onlineiesELECTRONICS & COMMUNICATION Max Marks = 100 Q.Nos 1 to 25 will carry one mark each Total Duration = 3 hours 1.What is the time function v x (t) for the circuit shown in figure if ω = 100 rad/s ↑ j 60 _+ _50 + 0.4 V V j 12 x x __j 25 = A s I a. v x (t) = 100 cos(100t– 36.87 0 ) V b. v x (t) = 250 cos(100t– 36.87 0 ) V c. v x (t) = 100 sin(100t– 36.87 0 ) V d. v x (t) = 150 sin(100t– 36.87 0 ) V 2.Consider the circuit of figure , suppose v s (t) = 30 u(t) V, Z s = 1Ω, Z L = 20 Ω, and the z -parameter matrix is Then Z in and Z out are V Z V _I 1 Z + V _I Z → Z in Two-Port _+ → ↑ o o o o 2 s + L ↑ s out 2 1 a.4 Ω, 34 Ωb. 5 Ω, 30 Ωc. 5.75 Ω, 34 Ωd. 5.75 Ω, 24 Ω3.Consider the graph and tree of a network , shown in the figure , the number of twigs and links of the network are respectively, 4 2 3 5 6 1 2 3 6 a.1,3 b. 5,1 c. 2,1 d. 4,2 Q4. Match List-I with List-II select the correct answer using the codes given below the lists: List-I List-II a. Drift current charge 1. Law of conservation b. Einstein’s equation 2. Electric field c. Diffusion current 3. Thermal voltage d. Continuity equation 4. Concentration gradient Codes: A B C D a. 2 1 4 3
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10.For the circuit shown, VCE and VBE are related by , (assume β to be very high )
6 V
CE
2k
2k
2k
2k
V
a. VCE = VBE b. VCE = 2 VBE c. VCE = ½ VBE d. VCE = 0
11.For the op-amp, BJT circuit shown assume β =4 for BJT , and op-amp to be ideal. Which is the correctstatement ,assume BJT be in active region and power supply will be ± 10 V
A
3 K
BVo
6 V
3 V
1 K
a. terminal A is inverting and V0 = 1V b. terminal A is non-inverting and V0 = 1V c. terminal A isinverting and V0 = 1.25V d. terminal A is non-inverting and V0 = 1.25V12.If mid-band gains from Vi to V0 under the condition when switch S is open and closed are A1 and A2 respectively , then A1 / A2 is given by, neglect hie of the BJT
a. b. c. d. 113.The input x and output y of a system are described by the differential equation :
Determine how the output will vary with time when there is an input which starts at zero time and then increasesat the constant rate of 6 units/s. The initial output is zero
a.y(t) = 3t – 1.5 e-2t
– 1.5 b. y(t) =1.5t – 1.5 e-3t
– 1.5 c. y(t) = 3t – 3e-2t
– 3
d. y(t) = 3t – 1.5 e-1.5t
– 1.5
14.A system has a forward path transfer function of 10 / (s+3) and a negative feedback loop with transfer function
5. What is the time constant of the resulting first-order system ?
a. 53 units b. 1.9 units c. 0.019 units d. 5 units
33. A 10-bit ADC with full-scale output voltage of 10.24 V is designed to have a ± LSB/2 accuracy. If the ADC is
calibrated at 250
C and the operating temperature ranges from 00
C to 500
C, then the maximum net temperature
coefficient of ADC should not exceed
a. ± 200 μ V/0
C b. ± 400 μ V/0
C
c. ± 600 μ V/0
C d. ± 800 μ V/0
C
34. Match List-I (computer terms) with List-II (definitions) and select the correct answer using the codes given
below the lists:List-I List-II
a. TTL 1. Non-saturation type and high power consumption
b. ECL 2. Low power consumption and high packing density
c. CMOS 3. High switching speed and good fan-out capability
d. I2
L 4. Bipolar logic with high packing density
Codes:
A B C D
a. 3 1 2 4
b. 2 3 1 4
c. 4 3 1 2
d. 4 3 2 1
35.In the figure shown, what is the value of V0
+
2 K
10 V
3.6 K
3 K
100
1.2 K
Vo
_
a.10 V b. 8 V c. 6 V d. 2 V36.As shown in the figure M1 and M2 are of same size M3 is triple in width as compared to M2 or M1.assume process parameter (Kn
’) is equal for all the devices. What is the value of V0 (Gate voltage of M2
a. 2 V b. 2.25 V c. 1 V d. can not be determined as gate voltage of M1 is notgiven37.For the circuit shown assume op-amp to be ideal M1 and M2 are identical and have Kn
’= 200 µA/v
2, w=
20 µm, L = 10 µm, VT = 1V. What is the value of V0
→
2 K
_ →
5 V5 V
1 K
3 V
Vo
M M1 2
+
a.4.2 V b.3 v c. 4 V d. can not be determined as op-amp is in positive feedback38.Input the op-amp circuit is sine wave of peak value of 10V. What is the duty cycle of output
a.0.55 b. 0.45 c. 0.5 d.139.A first order system when subject to a step input rises to 90 % of its steady state value in 20 s. Determine its
time constant and the rise time assuming the rise time represents a 10% to 90 % rise to the steady-state value
a.5.6 s, 20 s b. 0.5 s, 10s c. 8.7 s, 19s d. 12 s, 18.85 s
40.Consider a control system with unity feedback
→
Y(s)R(s) +
_ →G(s)→
↑
Where
The gain and phase margin area.closed-loop system is unstable b. GM = 20.4 dB, PM = 58.1
0c. GM = 6.6 dB, PM = 60.4
0
d. GM = ∞ dB, PM = 58.10
41. The fourier transform of the o/p of the scheme shown below after using the first three terms in the power
56.A train running at a uniform speed crosses two women coming in the opposite direction at 2.4 kmph and 6
kmph in 45 seconds and 36 seconds respectively . Find the speed of the train ?
a.10.8 kmph b. 12 kmph c. 13.2 kmph d. 14.4 kmph
57.A, B and C start a business . A invests 2 times as much as B invests . A and B invests 3 times of what C invests.
Then the ratio of capital of A,B and C is ?
a.1:3:6 b. 6:3:1 c. 1:2:3 d. 3:2;158.A container contains 1000 litres of milk. From this container 100 litres of milk was taken out and replaced by
water . If this process was repeated another three times , how much milk is now contained by the container ?
a.729 lts b. 700 lts c. 656.1 lts d. 343.9 lts
59.Identify the pair of words , which has a relationship similar to the pair in question
Romantic : Realistic
a.Dramatic : Prosaic b. Fanciful : actual c. Thought : idea d. Poet : Dramatist
60.This question has a set of four words . Choose the word that does not belong to the group
a. Cartridge b. Barrel c. Gun d. Drum
Q.Nos 61 to 65 will carry two marks each
61.In the following sentence , some part of the sentence is underlined . Beneath each sentence you will find four
ways of phrasing the underlined part. Choose the best choice that follows the requirements of standard written
English
In the split brain preparation , we have managed to dissociate various parts of the brain from one another
a.to associate various parts of the brain from one another b. to dissociate various parts of the brain from one
another c. to dissociate various parts of the brain from each another d. to dissociate various
parts of the brain among each other
62.A program instituted in a particular state allows parents to prepay their children’s future college tuition at
current rates .The program then pays the tuition annually for the child at any of the states public colleges in which
the child enrolls . Parents should participate in the program as a means of decreasing the cost of their children’s
college education.
Which of the following , if true , is the most appropriate reason for parents not to participate in the program ?
a.The parents are unsure about which public college in the state the child will attend b. The amount of money
accumulated , by putting the prepayment funds in an interest-bearing account today will be greater than the total
cost of tuition for any of the public colleges when the child enrolls c. The annual cost of tuition at the states
public colleges is expected to increase at a faster rate than the annual increase in the cost of living d. Someof the state’s public colleges are contemplating large increase in tuition next year.
63.This question consists of six statements followed by options consisting of three statements put together in a
specific order . Choose the option which indicates a valid argument , that is , where the third statement is a
conclusion drawn from the preceding two
(A) Navratilova won the tournament (B) Only talented people can win a tournament (C) Graf is not
talented (D) Navratilova is not talented (E) Graf lost the tournament (F) Navratilova is more
talented than graf
a. BAD b. BCE c. DAF d. EAC
64.Rajesh started walking along the boundaries square field from corner point A. After half an hour, he reached
the corner point ‘C’ diagonally opposite to A. If this speed was 8 kmph what is the area of the field in square
kilometer ?
a. 16 b. 4 c. 8 d. none
65.If the price of petrol is increased by 20 % and subsequently by 40 %, what is the final price if the original price is