Ports and Marine Organization
Seafarers' Examination and Documents Directorate
Exam Code : EOPI Subject : Control and Precise Instruments
Rank : Electro-Technical Officer (ETO)
Date:
Time allowed: ٢.٥ Hrs
(Pass mark : ٥٥ )
Q.١) - With regard to control systems explain briefly the following terms:
a) - Basic elements in control loop.
b) - Feedback control system.
c) - Manual and automatic control system.
(٥M)
(٥M)
(٦M)
Q.٢) - With regard to instrumentation explain the following sensors:
a) - Speed sensors
b) - Strain gauge
(٨M)
(٨M)
Q.٣) - With reference to PID close loop controller explain the Ziegler-Nichols tuning
method.
(١٦M)
Q.٤) - With regard to fire detection system
a) - Sketch and describe automatic detectors Rate-of-Rise type.
b) - Explain the advantages and disadvantages of thermistor sensor.
.
(٨M)
(٨M)
Q.٥) - With regard to PID controller in the following integrator circuit draw the time related
output voltage waveform if the capacitor is initially charged +٣ volt.
(٢٠M)
١µF +٥ R ٠ Volt C
V in ٢٠٠ k ٠.٢ SEC ‐
+ ‐
+
V out Q.٦) - Sketch and describe the Variable Voltage Variable Frequency Inverter drive (PWM)
with IGBT.
(١٦M)