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3 years ago

Write down a transfer function of a stable system for which pure proportional feedback could drive the system unstable.

Engineering

1 answer:

gtnhenbr [62]3 years ago

6 0

Answer:

$Gs = 1 / (s + 1)^3$

Explanation:

A system is known to be a stable system if the poles of the system lie on the negative real axis of the s plane.

A system that could be driven unstable by a P-controller would be:

$Gs = 1 / (s + 1)^3$

As the value of K increases, the closed loop poles move into the right half s plane

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Consider a Carnot refrigeration cycle executed in a closed system in the saturated liquid-vapor mixture region using 0.96 kg of

Eduardwww [97]

Answer:

$P_m_i_n= 356.9 KPa$

Explanation:

Coefficient of performance (COP) of refrigeration cycle is given by:

$COP=\frac{1}{\frac{T_H}{T_L}-1 }$

We are given:

$T_H=1.2T_L$

$COP=\frac{1}{1.2-1 }$

COP= 5

We can also write Coefficient of performance (COP) of refrigeration cycle as:

$COP_R=\frac{Q_L}{W_i_n}$

Amount of heat absorbed by low temperature reservoir can be found as:

$Q_L=COP_R * W_i_n$

$Q_L=5 * 22 KJ$

$Q_L=110 KJ$

According to first law of thermodynamics amount of heat rejected by hot reservoir is given by:

$Q_H=Q_L + W_i_n$

$Q_H=110 KJ + 22 KJ$

$Q_H=132 KJ$

We are given the mass of 0.96 kg. So,

$q_H=\frac{Q_H}{m}$

$q_H=\frac{132 KJ}{0.96Kg}$

$q_H=137.5 KJ/Kg$

Since it is a saturated liquid-vapour mixture $q_H=h_f_g$ .

$q_H=h_f_g=137.5 KJ/Kg$

From Refrigerant 134-a tables $T_H$ at $h_f_g=137.5 KJ/Kg$ is 61.3 C. (We calculated this by interpolation)

Converting $T_H$ from Celsius to Kelvin:

$61.3^{o} C+273 = 334.3^{o} K$

$T_H= 334.3^{o} K$

We are given:

$T_H=1.2T_L$

$T_L=\frac{T_H}{1.2}$

$T_L=\frac{334.3}{1.2}$

$T_L=278.58^{o} K$

Converting $T_L$ from Kelvin to Celsius:

$278.58^{o} K-273 = 5.58^{o} C$

$T_L= 5.58^{o} C$

From Refrigerant 134-a tables $P_m_i_n$ at $T_L=5.58^{o} C$ is 356.9 KPa. (We calculated this by interpolation).

$P_m_i_n= 356.9 KPa$

8 0

3 years ago

A chemistry student accidentally drops a large mercury thermometer and it breaks. The thermometer contained 2 grams of mercury (

loris [4]

Answer:

23.1 35f

Explanation:

not dumb

4 0

3 years ago

GMA MIG weiding is a

Dvinal [7]

Gas metal arc welding (GMAW), sometimes referred to by its subtypes metal inert gas (MIG) welding or metal active gas (MAG) welding, is a welding process in which an electric arc forms between a consumable MIG wire electrode and the workpiece metal(s), which heats the workpiece metal(s), causing them to melt and join.

6 0

3 years ago

Introduction to gear and gear ratios: If you have two gears of the same size does the output speed increase, decrease, or remain

creativ13 [48]

Answer:

remain the same constant

Explanation:

if a small gear is making 5 rpm turning a big gear thats making 1 rpm the bug gear is making lots of torque but if its going the opposite way its much harder to turn the big gear 1 rpm just to make the little gear do 5 rpm and it makes way less torque if thre both the same size there ging to stay the same speed

4 0

3 years ago

A cast-iron tube is used to support a compressive load. Knowing that E 5 10 3 106 psi and that the maximum allowable change in l

Papessa [141]

Answer:

(a) 2.5 ksi

(b) 0.1075 in

Explanation:

(a)

$E=\frac {\sigma}{\epsilon}$