Higher National ITE Certificate - System Integration

Higher National ITE Certificate in Technology - System Integration and Controls

• Exam Structure:
  • Theory paper
  • 1 hour 30 minutes
  • Sample A
  • Two sections (A & B)
  • Section A: 5 short answer questions
  • Section B: 2 structured essay questions
  • Attempt all questions
  • Answer booklet provided
  • Use blue or black ink
  • Formula sheet (Annex B)
  • g = 9.81 m/s²
  • Write NRIC/FIN
  • Include question numbers on answer booklet front cover
  • Return question paper at end

Section A - 40 Marks (8 marks per question)

• Question 1 (i):

  • Accuracy of measuring instruments is affected by environmental conditions and wear.
  • Two other reasons requiring instrument calibration:
    • Stability of measurement
    • Accuracy of device

• Question 1 (ii):

  • 3-point calibration does not effectively show linearity error.
  • Sketch of linearity error situation for 3-point calibration

• Question 2 (A):

  • Cylindrical tank filled with water and trapped air.
  • Pressure at base of tank = 17 kPa
  • Air pressure in the tank = 2 kPa
  • Density of water = 1000 kg/m³
  • Calculate height (h) of water in tank.

• Question 2 (B):

  • I/P transducer converts current (4mA-20mA) to pneumatic pressure (3psi-15psi).
  • Sensor transmits 15mA current signal.
  • Determine corresponding pneumatic signal.

• Question 3 (i):

  • Two types of control valve in a closed loop system :
  • Example answer: Ball valve/Globe valve

• Question 3 (ii):

  • Relationship between flow ratio through a valve and valve travel is called flow characteristic.
  • Sketch valves characteristics: Quick Opening & Equal Percentage flow.

• Question 4 (i):

  • Importance of maintenance in process industries:
  • Example answer: Proper instrument readings/ Prevent breakdown

• Question 4 (ii):

  • Classification of maintenance: Preventive Maintenance
  • Advantages of preventive maintenance:
  • Example answer: Reduced risk of failures/Reduced repairs costs.
  • Disadvantages of preventive maintenance:
  • Example answer: Higher cost than reactive maintenance/Unnecessary maintenance

• Question 5 (A):

  • Two properties of conveying velocity in vibratory bowl feeder.

• Question 5 (B):

  • 4-phase stepper motor with 6 rotor teeth.
  • Calculate stepper motor step-angle.

Section B - 60 Marks (30 marks per question)

• Question 6 (A):

  • Incomplete PID diagram of flow control process.
  • Draw and label instruments, tag numbers, signal lines, and operating ranges,
  • Identify controlled variables and actuator.

• Question 6 (B):

  • Differential pressure flowmeter measures flow rate at different pressures.
  • Calculate new flow rate at new pressure

• Question 7 (A) (i):

  • Explain leadthrough programming used in robot programming

• Question 7 (A) (ii):

  • Melfa Basic IV program for robot (Mitsubishi RV-2AJ)
  • Pick and place operation sequence (start, Home position, detect milk boxes, move to P1, Place in carton, return to Home, Turn ON conveyor)

• Question 7 (B):

  • Automated stamping machine using PLC program.
  • Pneumatic circuit sequence (A+B+B-A-)
  • Write a PLC program for the motion sequence using Ladder Diagram.

This quiz covers key concepts in System Integration and Controls as part of the Higher National ITE Certificate. It includes a structured theory paper with questions focusing on measuring instruments, calibration, and linearity errors. Prepare to answer both short and structured essay questions effectively.