Question
71
Zero pada instrumen berarti...
The main benefit of integral action in PID control is to...
Options
a
Nilai keluaran pada batas bawah rentang pengukuran
Reduce or eliminate steady-state error
b
Nilai maksimum pengukuran
Eliminate the need for feedback
c
Selisih antara dua alarm
Reduce the number of actuators
d
Jumlah sensor yang dipasang
Convert digital signals into analog signals
Grade
Ungraded
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Question
72
Span pada instrumen adalah...
Integral windup can occur when...
Options
a
Selisih antara batas atas dan batas bawah rentang pengukuran
Integral action continues accumulating while the actuator has reached its limit
b
Nilai error sesaat
The sensor operates within its normal range
c
Waktu respon controller
The setpoint equals the output
d
Jumlah actuator
The system has no controller
Grade
Ungraded
Last Update
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Question
73
Akurasi instrumen menunjukkan...
One method of reducing integral windup is to...
Options
a
Kedekatan hasil pengukuran terhadap nilai sebenarnya
Use an anti-windup mechanism or integral limiting
b
Kecepatan actuator bergerak
Increase Ki without limit
c
Besarnya supply listrik
Remove all sensors
d
Jumlah data yang disimpan
Reduce the supply voltage
Grade
Ungraded
Last Update
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Question
74
Repeatability menunjukkan kemampuan instrumen untuk...
Derivative action considers...
Options
a
Memberikan hasil yang konsisten saat pengukuran diulang pada kondisi yang sama
The rate of change of error
b
Mengubah sinyal analog menjadi digital
The accumulation of past error
c
Menghilangkan seluruh noise
Only the setpoint value
d
Menaikkan set point otomatis
The number of alarms
Grade
Ungraded
Last Update
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Question
75
Hysteresis pada instrumen berarti...
Derivative action helps the system by...
Options
a
Perbedaan output pada nilai input yang sama saat input naik dan turun
Providing damping and reducing the tendency to overshoot
b
Kegagalan total sensor
Eliminating feedback
c
Gangguan listrik pada busbar
Increasing sensor noise
d
Perubahan set point manual
Increasing steady-state error
Grade
Ungraded
Last Update
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Question
76
Noise pada sinyal sensor dapat menyebabkan...
Derivative action is usually sensitive to...
Options
a
Pembacaan tidak stabil dan aksi kontrol yang tidak diinginkan
Measurement noise
b
Sensor menjadi lebih akurat
Cable color
c
Actuator selalu bekerja lebih lambat
Fuel level
d
Plant menjadi open loop
Panel size
Grade
Ungraded
Last Update
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Question
77
Shielding kabel instrumen digunakan untuk...
A filter in the derivative signal is used to...
Options
a
Mengurangi gangguan elektromagnetik pada sinyal
Reduce the effect of high-frequency noise
b
Menaikkan tegangan sinyal
Increase sensor noise
c
Mengurangi jumlah sensor
Remove the setpoint
d
Menghasilkan feedback
Convert the plant into an open-loop system
Grade
Ungraded
Last Update
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Question
78
Ground loop pada sistem instrumentasi dapat menyebabkan...
PI control combines...
Options
a
Gangguan atau error pada sinyal pengukuran
Proportional and integral actions
b
Peningkatan kapasitas plant
Integral and derivative actions only
c
Set point menjadi lebih akurat
Analog and digital control
d
Actuator bekerja tanpa controller
Sensors and actuators
Grade
Ungraded
Last Update
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Question
79
PLC scan cycle secara umum terdiri dari...
PD control combines...
Options
a
Membaca input, menjalankan program, lalu memperbarui output
Proportional and derivative actions
b
Mengubah plant, sensor, lalu set point
Proportional and integral actions
c
Menghidupkan generator, boiler, lalu pompa
Integral and feedforward actions
d
Menghapus semua alarm lalu restart
Manual and automatic control
Grade
Ungraded
Last Update
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Question
80
Digital input PLC biasanya menerima sinyal...
PI control is commonly used when...
Options
a
ON/OFF dari switch atau contact
Good response and elimination of steady-state error are required
b
4–20 mA kontinu saja
No sensor is available
c
Tekanan udara langsung
The system must always operate open loop
d
Temperatur tanpa sensor
The output does not need to be controlled
Grade
Ungraded
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