Question
61
Pada sistem kontrol level tangki, controlled variable adalah...
A controlled variable is...
Options
a
Ketinggian cairan dalam tangki
A process variable that must be maintained at a specified value
b
Posisi kabel sensor
Only the starter battery current
c
Ukuran control valve
The panel indicator color
d
Tekanan udara instrumen
The number of sensors in the system
Grade
Ungraded
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Question
62
Pada sistem kontrol tekanan, actuator yang umum digunakan adalah...
An example of a controlled variable in an engine cooling system is...
Options
a
Control valve
Jacket cooling water temperature
b
Pressure transmitter
Cooling pipe color
c
PLC
Number of pump bolts
d
Alarm bell
Expansion tank diameter
Grade
Ungraded
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Question
63
Sensor yang umum digunakan untuk mengukur putaran poros adalah...
An example of a manipulated variable in jacket cooling water temperature control is...
Options
a
Speed sensor atau tachometer pickup
Control valve opening or cooling-water flow rate
b
Pressure transmitter
Temperature sensor color
c
RTD
Number of alarms on the panel
d
Level switch
Cable insulation thickness
Grade
Ungraded
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Question
64
Proximity sensor pada sistem permesinan dapat digunakan untuk...
A disturbance in a temperature control system may be...
Options
a
Mendeteksi posisi atau keberadaan objek tanpa kontak langsung
A change in engine load that changes heat generation
b
Mengukur kualitas bahan bakar
A fixed setpoint value
c
Menghasilkan udara tekan
A stored PLC program
d
Mengatur frekuensi generator
The equipment name
Grade
Ungraded
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Question
65
Limit switch biasanya digunakan untuk...
A feedforward control system differs from feedback control because feedforward control...
Options
a
Mendeteksi posisi akhir gerakan mekanis
Acts on a measured disturbance before the output deviates
b
Mengukur temperatur tinggi
Always operates without sensors
c
Mendeteksi level analog kontinu
Never uses a controller
d
Mengubah sinyal digital menjadi analog
Is used only in manual systems
Grade
Ungraded
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Question
66
Fungsi transmitter pada instrumentation system adalah...
A combination of feedforward and feedback control can be used to...
Options
a
Mengubah dan mengirim sinyal hasil pengukuran ke controller atau monitoring system
Anticipate disturbances while correcting any remaining deviation
b
Menggerakkan valve secara langsung tanpa sinyal
Eliminate the need for actuators
c
Menghasilkan tegangan generator
Remove the setpoint
d
Menggantikan plant
Disable sensors
Grade
Ungraded
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Question
67
Sinyal standar 4–20 mA banyak digunakan karena...
Pure proportional control may leave...
Options
a
Dapat mentransmisikan nilai proses secara analog dengan andal
Steady-state error or offset
b
Hanya memiliki kondisi ON dan OFF
No response at all
c
Tidak membutuhkan sumber daya
No controller output
d
Tidak dapat mendeteksi kabel putus
Zero electrical frequency
Grade
Ungraded
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Question
68
Nilai 4 mA pada loop 4–20 mA biasanya mewakili...
Increasing Kp generally makes the initial response...
Options
a
Batas bawah rentang pengukuran
Stronger and faster in response to error
b
Batas atas rentang pengukuran
Always slower
c
Gangguan hubung singkat
Completely unchanged
d
Nilai alarm shutdown
Turn into an open-loop system
Grade
Ungraded
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Question
69
Jika sinyal 4–20 mA turun menjadi sekitar 0 mA, salah satu kemungkinan adalah...
If Kp is too high, it may cause...
Options
a
Kabel putus atau kehilangan supply loop
Increased overshoot and oscillation
b
Variabel proses selalu maksimum
Loss of the setpoint
c
Controller bekerja normal tanpa sensor
The sensor to become an actuator
d
Actuator membuka penuh
An analog signal to become digital
Grade
Ungraded
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Question
70
Kalibrasi transmitter dilakukan untuk...
Integral action considers...
Options
a
Memastikan output transmitter sesuai dengan nilai input yang diketahui
The accumulation of error over time
b
Menambah range plant tanpa pengukuran
Only the instantaneous change in error
c
Mengubah sensor menjadi actuator
Only the sensor output without error calculation
d
Mengurangi jumlah alarm
Network frequency
Grade
Ungraded
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