Sampling Theory – 1 – 1

1. As per sampling theorem –

(a) The signal should be sampled at least twice each cycle of its lowest frequency
(b) Twice each cycle of its highest frequency
(c) Guard time should be as large as possible
(d) Nyquist rate should be as low as possible

ANSWER
Answer : (b)

EXPLANATION
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2. In communication the sampling technique leads to –

(a) Higher efficiency
(b) Higher speed of communication
(c) cheaper equipment
(d) All of the above

ANSWER
Answer : (b)

EXPLANATION
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3. A signal of maximum frequency of 10 kHz is sampled at Nyquist rate. The time interval between two successive sample is –

(a) 50 µs
(b) 100 µs
(c) 1000 µs
(d) 5 µs

ANSWER
Answer : (a)

EXPLANATION
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4. Impulse modulation systems, The number of samples required to ensure no loss of information is given by –

(a) Fourier transmission
(b) Nyquist theorem
(c) Parsevals theorem
(d) None of the these

ANSWER
Answer : (b)

EXPLANATION
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5. If the sampling time is less than the Nyquist interval :

(a) Simpler filters can be used to obtain the original signal
(b) Bandwidth increases
(c) Channel Capacity increases
(d) Guard time becomes less

ANSWER
Answer : (a)

EXPLANATION
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