Placement Papers: ISRO Sample Test Paper on 15th July 2006 at Delhi
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If sampling frequency doubles then

Quantization noise decreases

Quantization density decreases

Quantization noise increases

Quantization density increases


Two signals of 2GHz and 4GHz are frequency modulated on same carrier 10 GHz. Find the ratio of frequency deviation if band widths of both are equal.

1: 2

2: 1

1: 1

1: 4


Gray code of 111 is

3X512 + 7X64 + 5X8 + 3 then value in binary form contains _______ number of 1s.

7

6

9

none


The 2s compliment of decimal number 19 in 8bit system is

The high gain codes are

Turbo codes

BCH codes

RS codes


BCH codes are of the type________

Time constant of LC circuit is

L/R

L/R2

RL


If R is doubled and C is halved then frequency of series RLC circuit is

The solution for the equation (D2 + 4) y = sin2x is

Laplace Tramsform of sin3x is

The Ztransform for the series is X [n] = 7; n = 1 { 5 n = 0} { 1 n = 1 } { 0 else}

The magic Tee is a

The register which holds the address of the next instruction is

The antenna gain is given by____ a

The satellite is in 630km orbit and transmitting at a frequency 5 MHz, when satellite is on your head the Doppler shift is____

The impedance of a lossless transmission line is v (L/C)

A 50line with load impedance 100? the VSWR is

In a waveguide measurement, the forward power is 10mW, the reverse power is 1mW then VSWR is _____________

Transmitted power is 100W, gain of the transmitter antenna is 30 dB and the path loss is 50 dB then received power is

When transmitted power is 100mW and the path loss 100 dBm then received power is80 dBm

When a em wave is incident normally on a perfect conductor then

Totally reflected

partially reflected

Totally transmitted

none.


Zsc = 100? Zoc = 1? then Zo is

When the operating wavelength of line is?/4 < < /2, the impedance is

The value of L if source is 50V AC of 10 KHz frequency and current is 7.96 A

The resonant frequency is 50MHz bandwidth 100 KHz then Q factor is

The Q factor of a series RLC circuit is

Q value of a parallel RLC circuit is ________

If the lines x + y + 3 = 0, x − 2y + 7 = 0, 2x + ky + 5 = 0 are required to be concurrent then the value of k is

The vectors i − 2j + k, 2i + 3jk, R are the complete, then r is given by ______

If a satellite revolving with angular velocity w and the velocity is v then Curl v is _______

w

2w

w 2


If each stage amplifier contains 10dB gain the figure of merit of 2stages is Given by

The maximum rate possible in kbps if F = 15 and bandwidth is 4 KHz is:

The maximum time allowed for each flip flop for a ripple counter of mod1024, if clock given to it is 1MHz is.

The maximum time allowed time for each flip flop for a mod 10 synchronous counter if each flip flop delay is 25ns.

25 ns

50 ns

100 ns

none


The high speed for CML gate is due to operating it in____region.

In a micro processor the wait states are inserted to

make the processor to wait during DMA operation

make the processor to wait during an interrupt processing

make the processor wait during a power shutdown.

interface the slow peripherals to the processor.


In a digital voltmeter the ADCs used are of type

The number of NAND gates are required to implement A? B (XOR), assuming compliments not available

The resolution for a DAC is given by 0.4% then no. Of bits of DAC is

The chip capacity is 256 bits, then the no. Of chips required to build 1024 B memory Is

Which of the following are correct?

A flipflop is used to store 1bit of information

Race around condition occurs in JK flip flop when both the inputs are 1

Master slave flip flop is used to store 2 bits of information

A transparent latch consists of a Dflip flop


The bit rate of a QPSK compared to BPSK is

half

double

same


There are 5 red balls and 5 black balls in a box. The probability to select 2 balls one after other without reputting is:

2/9

1/90

11/90

none


The rms voltage is obtained by multiplying peak by a factor

H (s) = S/(S + a) is a transfer function of ______

LPF

Notch

BPF

HPF


Resistance of a 2 parallel resistors is 12? and the effective resistance when one resistor broke is 18? then the value of resistance in another is_________

The output of a phase modulator when input applied is integrating signal is

FM

AM

PM

none


For a transformer the losses which vary with load are

core losses

copper losses

Hysterises losses

none.


The waves which cannot be transmitted in waveguide are

TE

TEM

TM

none


Diplexer is a

circulator only

only transmitter filter

only receiver filter

both transmitter and receiver filter


d (t) represents impulse then (d (t)? cos 2t) dt with limits 0 to infinity is