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The mixing vat in a factory receives liquid ingredients through six separate value--- labeled R.S.T.U,Y and Z -- each of which has exactly two settings: open and closed.The mixing vat operator must ensure that each valve is set open or closed according to the following conditions: If T is open, both S and Z must be closed, R and Z cannot both be closed at the same time; If Y is closed, Z must also be closed;S and U cannot both be open at the same time. If the maximum number of valves that can be closed at the same time are closed which of the following must true?
A R is open
B S is open
C T is open
D Z is open
The mixing vat in a factory receives liquid ingredients through six separate value--- labeled R.S.T.U,Y and Z -- each of which has exactly two settings: open and closed.The mixing vat operator must ensure that each valve is set open or closed according to the following conditions: If T is open, both S and Z must be closed, R and Z cannot both be closed at the same time; If Y is closed, Z must also be closed;S and U cannot both be open at the same time. If R is closed and U is open, which of the following must be true?
A S is open
B T is open
C T is closed
D Y is closed
The mixing vat in a factory receives liquid ingredients through six separate value--- labeled R.S.T.U,Y and Z -- each of which has exactly two settings: open and closed.The mixing vat operator must ensure that each valve is set open or closed according to the following conditions: If T is open, both S and Z must be closed, R and Z cannot both be closed at the same time; If Y is closed, Z must also be closed;S and U cannot both be open at the same time. If Z is open, which of the following must be true?
A S is open
B T is open
C U is open
D y is open
The mixing vat in a factory receives liquid ingredients through six separate value--- labeled R.S.T.U,Y and Z -- each of which has exactly two settings: open and closed.The mixing vat operator must ensure that each valve is set open or closed according to the following conditions: If T is open, both S and Z must be closed, R and Z cannot both be closed at the same time; If Y is closed, Z must also be closed;S and U cannot both be open at the same time. Which of the following, if given to the mixing vat operator as an instruction, would not determine the setting of any other valve ?
A S must be open
B T must be open
C U must be open
Compared to an open-loop system, a closed-loop control system is:
A more accurate
B more complex
C more stable
D All of the above
E None of the above
In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is
A $$\frac{{\text{G}}}{{1 + {\text{H}}}}$$
B $$\frac{{\text{H}}}{{1 + {\text{G}}}}$$
C $$\frac{{\text{G}}}{{\text{H}}}$$
D $$\frac{{\text{H}}}{{\text{G}}}$$
In closed loop control system, with positive value of feedback gain the overall gain of the system will
A Decrease
B Increase
C Be unaffected
D Exponentially increase
On which of the following factors does the sensitivity of a closed loop system to gain changes and load disturbances depend ?
A Frequency
B Loop gain
C Forward gain
D All of the above
Which of the following statements is correct for any closed loop system ?
A All the co-efficients can have zero value
B All the co-efficients are always non-zero
C Only one of the static error co-efficients has a finite non-zero value
D None of the above
Is a closed loop system.
A Auto-pilot for an aircraft
B Direct current generator
C Car starter
D Electric switch

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