List of top Communication Systems Questions on Phase Shift Keying (PSK)

An ideal, massless spring with spring constant 1 N/m (upper panel of the given figure) is cut into 5 equal parts. If two of these parts are connected in parallel (lower panel of the given figure), what is the resultant spring constant in N/m? (rounded off to the nearest integer)

 

The frequency of the oscillator circuit shown in the figure below is _______(in kHz, rounded off to two decimal places). 

Given: \( R = 1 \, k\Omega; R_1 = 2 \, k\Omega; R_2 = 6 \, k\Omega; C = 0.1 \, \mu F \)

Polylactic-co-glycolic acid (PLGA) is combined with an equal amount (by weight) of hydroxyapatite (HA) to make a bone scaffold. If the porosity of the scaffold is 80%, what is the scaffold density in g/cm\(^3\)? (rounded off to two decimal places)
Assume densities of PLGA and HA to be 1 g/cm\(^3\) and 3 g/cm\(^3\), respectively.
Polylactic-co-glycolic acid (PLGA) is combined with an equal amount (by weight) of hydroxyapatite (HA) to make a bone scaffold. If the porosity of the scaffold is 80%, what is the scaffold density in g/cm\(^3\)? (rounded off to two decimal places)
Assume densities of PLGA and HA to be 1 g/cm\(^3\) and 3 g/cm\(^3\), respectively.

The frequency of the oscillator circuit shown in the figure below is _______(in kHz, rounded off to two decimal places). 

Given: \( R = 1 \, k\Omega; R_1 = 2 \, k\Omega; R_2 = 6 \, k\Omega; C = 0.1 \, \mu F \)

An ideal, massless spring with spring constant 1 N/m (upper panel of the given figure) is cut into 5 equal parts. If two of these parts are connected in parallel (lower panel of the given figure), what is the resultant spring constant in N/m? (rounded off to the nearest integer)
\includegraphics[width=0.5\linewidth]{59.png}