Automation, Control Equipment. Test 1

What is static amplifying

Corresponding change in signals
Change in output signal divided by change in input signal
Change in input signal divided by change in output signal
Change in input signal times change in output signal

During routine checking of alarm functions of main and auxiliary equipment, some setpoints are canceled due to a mistake. What will be the appropriate routine to ensure correct setpoints are set?

Consult with the instruction manual for the equipment in question for correct values.
Ask your colleague if he remembers the correct setpoint
Select a setpoint based on present condition allowing for a reasonable safety margin.
Check from previous records for correct values

Prior to the lunch break, the Engineer on Duty observes that the operating generator set has an output of 90%. With regard to operation of the generator, what is the - most important - assumption(s) for him to check before switching to UMS-mode?

That all operating parameters of the generator set in operation are normal (e.g. exhaust temperatures, lubeoil pressure, cooling water temperature etc.)
That a secondary auxiliary set is switched to automatic standby mode
Visually checking the auxiliary engine that there are no leaks or other obvious operating failures
All parameters as listed under the other alternatives.

What will be the probably outcome if the amplification is set to high on the controller

The set-point will change
The process response will be very slow
Nothing
The process will oscillate and get out of control

What precaution is to be taken when the Engineer on Duty is entering an UMS-mode operated engine room due to an alarm or due to a scheduled routine check?

Switch the UMS selector switch to manual mode only
Switch the UMS selector switch to manual mode and engage the 'dead man alarm'
Leave the UMS selector switch in UMS-mode
Any of the mentioned alternatives will meet the requirements.

The thermal expansion valve responds to the

Amount of superheat in the vapor in the liquid
Temperature in the evaporator coil
Pressure in the evaporator coil
Amount of superheat in the vapor leaving the coil

PT-100 sensors are some times used with 3 or even 4 wires. What is the reason for this?

For fault indication.
Because of power-consumption.
Higher mechanically strength of the cable.
Higher measuring accuracy.

What principle of measurement is the viscosity controller based on?

measurement of two different temperatures
measurement of flow
Measurement of differential pressure
measurement of temperature

Review Answers