Free Printable EMT358

1.

One way to derive FM from PM is:

a)

integrate the modulating signal before applying to the PM oscillator

b)

integrate the signal out of the PM oscillator

c)

differentiate the modulating signal before applying to the PM oscillator

d)

differentiate the signal out of the PM oscillator

2.

Accurate calculation of FM bandwidth requires the use of:

a)

Carson’s rule

b)

Bessel functions

c)

Taylor series

d)

fractals

3.

FM bandwidth can be approximated by:

a)

Armstrong's Rule

b)

Bessel's Rule

c)

Carson's Rule

d)

none of the above

4.

If a 2-volt instantaneous value of modulating signal amplitude causes a 10-kHz deviation in carrier frequency, what is the deviation sensitivity of the modulator?

a)

5 A/V

b)

5 V/kHz

c)

5 kHz/V

d)

5 dB

5.

Hartley's Law is:

a)

$I=k\ t\ B$

b)

$C=\ 2\ B\ \log_2M$

c)

$SR\ =\ 2\ f_{\max}$

d)

$C\ =\ B\ \log_2(1+S/N)$

6.

The Shannon-Hartley theorem is:

a)

$I\ =\ k\ t\ B$

b)

$C\ =\ 2\ B\ \log_2M$

c)

$C\ =\ B\ \log_2(1+S/N)$

d)

$SR\ =\ 2\ f_{\max}$

7.

The Shannon Limit is given by:

a)

$I\ =\ k\ t\ B$

b)

$C\ =\ 2\ B\ \log_2M$

c)

$C\ =\ B\ \log_2(1+S/N)$

d)

$SR\ =\ 2\ f_{\max}$

8.

The Nyquist Rate can be expressed as:

a)

$I\ =\ k\ t\ B$

b)

$C\ =\ 2\ B\ \log_2M$

c)

$C\ =\ B\ \log_2(1+S/N)$

d)

$SR\ =\ 2\ f_{\max}$

9.

Natural Sampling does not use:

a)

a sample-and-hold circuit

b)

true binary numbers

c)

a fixed sample rate

d)

an analog-to-digital converter

10.

Determine the time taken to send 100,000 bits over a channel with a bandwidth of 2,000 hertz and a channel constant of k = 10. [Hartley's Law ]

a)

5 miliseconds

b)

5 nanoseconds

c)

5 seconds

d)

5 x10²seconds

11.

Determine the bandwidth required to send 12,000 bits per second if the number of levels transmitted is 8. [Shannon-Hartley theorem]

a)

2000 Hertz

b)

20000 Hertz

c)

2 Hertz

d)

200 Hertz

12.

Determine the Shannon Limit of a channel that has a bandwidth of 4000 hertz and a signal-to-noise ratio of 15.

a)

16 Mbps

b)

16 kbps

c)

16 Gbps

d)

16 bps

13.

Figure shows a constellation diagram for a quadrature amplitude modulation. Determine the value of M.

a)

8

b)

4x4

c)

16

d)

4

14.

Figure shows a type of shift-keying modulation scheme, identify the type and number of keying scheme.

a)

FSK, 4

b)

FSK, 3

c)

PSK, 3

d)

PSK, 4

15.

A digital rectangular wave signal with a period of 71.4 μs will be adequately passed if the bandwidth includes the fourth harmonic. Determine the minimum Nyquist sampling frequency.

a)

1.12 kHz

b)

110 kHz

c)

112 kHz

d)

1.12 MHz

EMT358

Total questions: 15

Worksheet time: 18mins

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