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GATE EC:2018 Mini Mock 2
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Question 1
A modulated wave s(t) = [ 1 + m(t) ] cos(2π 
t) is applied to the system shown:
m(t) is band limited to 1 kHz and |m(t)|< 1. The low pass filter is ideal with pass band magnitude of 1 and cutoff frequency of 3 kHz. The output y(t) is equal to
t) is applied to the system shown: m(t) is band limited to 1 kHz and |m(t)|< 1. The low pass filter is ideal with pass band magnitude of 1 and cutoff frequency of 3 kHz. The output y(t) is equal to
Question 2
Consider an rectangular waveguide filled with lossless dielectric 
operating at 4 GHz. It the guide phase constant is 50 ° per cm, then the critical wave number is ______ rad/m.
operating at 4 GHz. It the guide phase constant is 50 ° per cm, then the critical wave number is ______ rad/m. Question 3
Given Figure shows a silicon transistor connected as a common emitter amplifier. The quiescent collector voltage of the circuit is approx.(
Question 4
What is the rise time (
) of a 2nd order system if damping ratio (ξ) = 0.40 and natural frequency (
) =2 rad/sec?
) of a 2nd order system if damping ratio (ξ) = 0.40 and natural frequency () =2 rad/sec? Question 5
In a AM signal, received signal power is 
with a maximum modulating signal of 5kHz.The noise spectral density at the receiver input is 
.If noise power is restricted to the message signal bandwidth only then signal-to-noise ratio at the input to the receiver is_______ (dB)
with a maximum modulating signal of 5kHz.The noise spectral density at the receiver input is .If noise power is restricted to the message signal bandwidth only then signal-to-noise ratio at the input to the receiver is_______ (dB)Question 6
The contents of some memory location of an 8085 
P based system are shown
The program is as follows
LXI H 3000H
MOV E, M
INX H
MOV D, M
LDAX D
MOV L, A
INX D
LDAX D
MOV H, A
The contents if HL pair after the execution of the program will be:-
P based system are shown The program is as follows
LXI H 3000H
MOV E, M
INX H
MOV D, M
LDAX D
MOV L, A
INX D
LDAX D
MOV H, A
The contents if HL pair after the execution of the program will be:-
Question 7
consider the circuit below with initial state Q0 = 1, Q1 = Q2 = 0. The state of the circuit is given by the value of 4Q2 + 2Q1 + Q0
which one of the following is the correct state sequence of the circuit?
which one of the following is the correct state sequence of the circuit?
Question 8
A radio link has a 50 W transmitter connected to an antenna of 4 m2 effective aperture at 6 GHz. The receiving antenna has an effective aperture of 0.25 m2 and is located at a 20 km line of sight distance from the transmitting antenna. Assume lossless, matched antennas, the power delivered to the received is______
Question 9
A semiconductor is exposed to radiation in such a way that the carriers are uniformly generated uniformly all over its volume. The semiconductor is p-type with NA= 1017/cm3. If the added hole concentration in stable state is given as 1013 /cm3 and if minority carrier lifetime= 100 µ sec. The generation rate due to radiation is
Question 10
The transconductance of a FET used in an amplifier circuit is 4000 micro-siemens. The load resistance is 15kΩ and drain circuit resistance is 10 MΩ. Calculate the voltage gain of the amplifier circuit.
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