WorksheetsSPECIAL CONTROL VALVES
Total questions: 15
Worksheet time: 8mins
Servo valves are operated by (a) motors
Servo valves are less expensive than proportional valves.
True
False
Neither True/ Nor False
A proportional valve is a valve that produces an output (direction, pressure, flow) that is (a) to an electronic control input.
Proportional valves are operated by proportional (a) , whereas servo valves are operated by torque motors.
The performance of a proportional valve is a compromise between a conventional solenoid valve and _____ valve.
Modular
Servo
cartridge
All the above
In which systems, spool of the servo valve is operated by a torque motor?
hydromechanical servo systems
electrohydraulic servo systems
conventional servo valve
all the above
Which of the following statements is true for a proportional valve?
spool of the proportional valve can travel maximum length
digital type of functioning is possible in proportional valve
proportional valve requires a separate flow control valve
all the above
Which of the following is a characteristic of servo valve?
open loop system
closed loop system
less contamination
all the above
What does servo mean in servo valve system?
It cannot receive a feedback and the desired output cannot be obtained
It can receive a feedback and the desired output can be obtained
It cannot receive a feedback but the desired output can be obtained
none of the above
What is the advantage of DC solenoid coils?
DC solenoid coils have high rush in current
DC solenoid coils have rating of 220 V DC
DC solenoid coils have constant level of current
all the above
Proportional and servo directional control valves have___________flow response than conventional directional control valves.
Slower
Same
Faster
A servo valve circuit for actuator positioning uses a/an:
Linear transducer
Load cell
Encoder
None of the above
5/2 way single solenoid valve has:
2 ports 2 positions
5 ports 2 positions
5 ports 5 positions
2 ports 5 positions
Which of the following is an element of time delay valve?
flow control valve
direction control valve
both a and b
none of the above
Which valve is also known as memory valve?
double pilot signal valve
single pilot signal valve
roller lever valve
logic valve
