Valves MCQ

Topic	Views	Activity
Which one of the following could be responsible for the difference between the initial and current steady-state conditions for the throttle valve ___	229	March 4, 2021
Subcooled water is flowing through a throttle valve in an open system ___	137	March 4, 2021
The valve that typically requires the least linear travel of the disk from fully closed to fully open is the ___ valve; and the valve that produces the greatest pressure drop when fully open is the ___ valve	194	March 4, 2021
Refer to the drawing of an operating cooling water system (see figure below) in which valves A and B are identical ___	202	March 4, 2021
Subcooled water is flowing through a throttle valve in an open system. The initial steady-state conditions for the throttle valve are as follows ___	165	March 4, 2021
Subcooled water was flowing through a throttled valve with the following initial parameters ___	158	March 4, 2021
Consider a 6-inch globe valve and a 6-inch gate valve in the same water system application ___	277	March 4, 2021
Refer to the centrifugal pump operating curve with two system head loss curves ___	168	March 4, 2021
Which one of the following types of similarly sized valves in an operating water system produces the least frictional head loss when fully open ___	526	March 4, 2021
Refer to the drawing of a cooling water system in which both centrifugal pumps A and B are operating ___	196	March 4, 2021
Which one of the following statements describes the throttling characteristics of a typical globe valve ___	224	March 4, 2021
Which one of the following statements describes the flow rate characteristics of a typical globe valve in an operating water system ___	137	March 4, 2021
A control valve is most likely to experience cavitation when the valve is almost fully ___ because of a relatively ___ pressure drop across the valve seat	1098	March 4, 2021
Consider a typical gate valve and a typical globe valve in the same water system application ___	260	March 4, 2021
Which one of the following statements describes the flow rate characteristics of a typical gate valve in an operating water system ___	130	March 4, 2021
If a pressure control valve at the outlet of a heat exchanger opens farther, system flow rate will ___; and system head loss will ___	253	March 4, 2021
The tank is protected by two relief valves that discharge to the atmosphere. The relief valves have the following characteristics ___	140	March 4, 2021
A cooling water system uses a conventional relief valve (not pilot-operated) with a bench-tested setpoint of 60 psig ___	150	March 4, 2021
A completely full water storage tank is being hydrostatically tested to 300 psig using a positive displacement pump (PDP) with a smooth and constant discharge flow rate of 4 gpm ___	137	March 4, 2021
A completely full water storage tank is being hydrostatically tested to 200 psig using a positive displacement pump (PDP) with a smooth and constant discharge flow rate of 4 gpm ___	277	March 4, 2021
A completely full water tank is being hydrostatically tested to 180 psig using a positive displacement pump (PDP) with a smooth and constant discharge flow rate of 6 gpm ___	154	March 4, 2021
A completely full water storage tank is being hydrostatically tested to 200 psig using a positive displacement pump (PDP) with a smooth and constant discharge flow rate of 6 gpm ___	161	March 4, 2021
Vessels A and B are identical except that vessel A receives overpressure protection from an installed safety valve ___	186	March 4, 2021
Water storage tanks A and B are identical except that tank A receives overpressure protection from a relief valve, whereas tank B uses a safety valve ___	144	March 4, 2021
Which one of the following is a difference between a typical relief valve and a typical safety valve ___	548	March 4, 2021
Refer to the drawing of two identical pressure vessels with identical relief valve protection. Both vessels have been pressurized to 50 psig and then isolated ___	297	March 4, 2021
The difference between the setpoint pressure at which a safety valve opens and the pressure at which it closes is called ___	362	March 4, 2021
The difference between the setpoint pressure at which a relief valve begins to open and the pressure at which it is fully open is called ___	225	March 4, 2021
Refer to the drawing of two identical pressure vessels with identical relief valve protection ___	262	March 4, 2021
The tank is protected by a relief valve and a safety valve that both discharge to the atmosphere. The valves have the following characteristics ___	228	March 4, 2021