# Industrial Automation and Control | NPTEL | Week 10 Assignment Solutions

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### Industrial Automation and Control NPTEL Week 10 Assignment Solutions

Q1. Which of the following is a type of power source in hydraulic system?

a) Pump
b) Strainer
c) Control valve
d) Cylinder

Answer: a)

Q2. Which of the following is the definition of pressure reducing valves?

a) Pressure reducing valve is designed to open at a predetermined pressure to redirect high volume of excess fluid to reservoir
b) Pressure reducing valve remain open and adjust pressure continuously
c) Pressure reducing valves are generally closed and used to maintain pressure in a circuit at certain portions
d) Pressure reducing valves maintain sequence of pressure and are two-way normally closed valves

Answer: a)

Q3. In the given regenerative reciprocating circuit(extension stroke), derive the expressions for V1 and V2 in terms of V and k. Here k=v1/v1-v2. A and a are piston surface and rod cross-section areas, respectively.

a) V1 = kV, V2 = (k + 1)V
b) V1 = (k – 1)V, V2 = (k + 1)V
c) V1 = kV, V2 = (k – 1)V
d) V1 = kV, V2 = (k + 2)V

Answer: c)

Q4. In the shown regenerative reciprocating circuit(retracting stroke), find the V1 in terms of V, a, A. Here, a and A are rod cross-section and piston areas, respectively.

a) V1 = V/A-a
b) V1 = AV/A-a
c) V1 = (A+a)V/A-a
d) V1 = V/A+a

Answer: b)

Q5. Find the ratio A/a where A is piston area and a is rod cross-section area for a regenerative reciprocating circuit when extraction speed is 3 time to that of retraction speed.

a) A/a = 4
b) A/a = 2.5
c) A/a = 2
d) A/a = 3

Answer: d)

Industrial Automation and Control NPTEL Week 10 Assignment Solutions

Q6. __________ system is preferred to use in explosive environment.

a) Hydraulic
b) Electrical
c) Pneumatic
d) All of the above

Answer: c)

Q7. Which one is pneumatic control element?

a) Compressor
b) Cylinder
c) Check valve
d) Directional valve

Answer: d)

Industrial Automation and Control NPTEL Week 10 Assignment Solutions

Q8. Match the following

a) A – II, B – III, C – IV
b) A – III, B – II, C – I
c) A – III, B – I, C – IV
d) A – III, B – I, C – II

Answer: d)

Industrial Automation and Control NPTEL Week 10 Assignment Solutions

Q9. Which one is considered as medium pressure air compressor?

a) 150 – 1000 PSI
b) 200 – 1200 PSI
c) 50 – 10000 PSI
d) 500 – 1500 PSI

Answer: a)

Q10. Air storage capacity: _______
Fill the blank with suitable option.

a) Pressure x Area
b) Pressure / Area
c) Pressure / Volume
d) Pressure x Volume

Answer: d)

Industrial Automation and Control NPTEL Week 10 Assignment Solutions

Q11. The shuttle valve is also known as ____________ logic valve.

a) AND
b) OR
c) NOR
d) NAND

Answer: b)

Q12. Time response of a typical small chamber cylinder is:

a) Undamped
b) Underdamped
c) Critically damped
d) Overdamped

Answer: b)

Q13. In typical kind of torque speed characteristics for pneumatic motors, with the increase in speed, torque will:

a) increase
b) decrease
c) initially increase then decrease
d) remain constant

Answer: b)

Q14. In Pneumatic system, AND gate is also known as:

a) Shuttle valve
b) Check valve
c) Memory valve
d) Dual pressure valve

Answer: d)

Q15. Pneumatic actuators are _______ in speed and ________ in size than Solenoid actuators.

a) faster, larger
b) slower, bigger
c) slower, smaller
d) faster, smaller

Answer: b)

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