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				| 1. | The sinusoid x(t) =6cos10πt is sampled at the rate of 15 Hz and applied to ideal rectangular LPF with cut-off frequency of 10 Hz, then the output of filter contains: | 
| A. | Only 10π rad/sec component | 
| B. | 10π rad/sec component | 
| C. | 10π rad/sec and 20π rad/sec components | 
| D. | +10π rad/sec and +20π rad/sec components | 
| Answer» C. 10π rad/sec and 20π rad/sec components | |