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ADC-UNIT2

Total questions: 15

Worksheet time: 8mins

Name
Class
Date
1.

Non linear digital modulation technique in which carrier frequency and phase is continuous is

a)

FSK

b)

BPSK

c)

QPSK

d)

ASK

2.

Digital modulation technique in which phase changes between 0° and 180° is called as

a)

QPSK

b)

BPSK

c)

ASK

d)

BFSK

3.

The filter used in reconstruction of original message signal from the modulated signal

a)

Band stop filter

b)

low pass filter

c)

HPF

d)

BPF

4.

The modulation technique in which the FSK signal gently shifts from one frequency level to another is known as

a)

Differential FSK

b)

Continuous PSK

c)

Differential PSK

d)

Continuous FSK

5.

For transmission from GSM mobile terminals, the modulation scheme used is

a)

Gaussian Minimum Shift Keying

b)

16-PSK

c)

QAM

d)

QPSK

6.

For an BASK modulated signal with a bit rate of 5000 bps,the minimum bandwidth is

a)

l000Hz

b)

5000Hz

c)

2000Hz

d)

2500Hz

7.

Which modulation technique is called as On-Off keying

a)

PSK

b)

BFSK

c)

QPSK

d)

ASK

8.

The mod-2 addition in binary codes refers to

a)

XOR

b)

AND

c)

OR

d)

XNOR

9.

Amplitude Shift Keying (ASK) is very rarely used in Modulators and Demodulators (Modems) because

a)

It is highly susceptible to noise

b)

It takes

care of amplitude only

c)

It shifts

only between ON and OFF states

d)

None of

the above

10.

In which of the following the frequency of the carrier signal varies based on information in a digital signal?

a)

ASK

b)

PSK

c)

FSK

d)

QPSK

11.

An Amplitude Shift Keying (ASK) modulated signal has a bit rate of 2000 bps, then what is the baud rate?

a)

1000

b)

2000

c)

3000

d)

4000

12.

In which of the digital modulation technique amplitude of the RF carrier is varries in accordance with baseband digital input signal?

a)

FSK

b)

BPSK

c)

QPSK

d)

ASK

13.

In which of the following digital modulation technique uses dibits encoding scheme?

a)

QPSK

b)

BPSK

c)

ASK

d)

FSK

14.

What is the minimum bandwidth for 8-QAM digital modulation?

a)

fb

b)

fb/2

c)

fb/3

d)

fb/4

15.

The other name of BPSK is ----

a)

Amplitude

Reversal Keying

b)

Phase

Reversal Keying

c)

frequency Reversal Keying

d)

Phase

Repeated Keying