A rotameter is an instrument designed to measure______________?
Show answer Hide answer
Answer: C. flow
Explanation
A rotameter is a variable-area flow meter used to measure fluid flow rates. It consists of a tapered tube and a float that rises or falls with fluid velocity. The position of the float indicates the volumetric flow rate of liquids or gases directly. Fluid flowing upward exerts drag force on the internal float against gravity. Equilibrium is reached when upward fluid drag equals the downward gravitational force on the float. Scale markings on the transparent tapered tube provide immediate visual flow rate readings.
Rotameters are widely used in industrial laboratories and chemical processing plants for gas monitoring. Their simple mechanical design requires no external electrical power supply for basic local readout. Water treatment facilities employ rotameters to regulate chemical dosing and liquid feed rates. Absolute pressure is measured using specialized manometers, barometers, or electronic pressure transducers. Velocity of fluid is typically measured with Pitot tubes, venturi meters, or hot-wire anemometers. Rotation speed of machinery is measured using tachometers or stroboscopic optical instruments.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. What effect does superheating have in a refrigeration cycle__________________?
Show answer Hide answer
Answer: B. decreases COP
Superheating the suction vapor generally decreases the volumetric efficiency and overall COP of a refrigeration cycle. Absorbing extra heat in the suction line increases specific volume, reducing the mass flow rate pumpe...
Q2. Solder is metallic mixture composed of________________?
Show answer Hide answer
Answer: C. tin and lead
Standard soft solder is a metallic alloy primarily composed of tin and lead.
Q3. How are boiler tube dimensions designated___________________?
Show answer Hide answer
Answer: C. outside diameter and thickness
Boiler tube dimensions are conventionally designated by their outside diameter and wall thickness. This standard naming convention ensures correct mechanical fit within tube sheet layouts. Outside diameter is critical be...
Q4. Under what conditions does steady flow take place___________________?
Show answer Hide answer
Answer: B. the velocity of successive fluid particles, at any point, is the same at successive periods of time
Steady flow occurs when the fluid velocity and properties at any given point do not change with respect to time. In a steady fluid flow field, local derivatives of velocity and pressure with respect to time equal zero. A...
Q5. The self-ignition temperature of gasoline is approximately in the range of___________________?
Show answer Hide answer
Answer: E. more than 500°C.
Gasoline has a relatively high self-ignition temperature, typically exceeding 500°C to prevent pre-ignition in engines. High auto-ignition thresholds ensure that gasoline vapor-air mixtures do not spontaneously detonate...
Q6. When does the release of heat of solution occur in an ammonia absorption system _____________________?
Show answer Hide answer
Answer: A. ammonia vapour goes into solution
The heat of solution is released when ammonia vapor goes into solution inside the absorber. Absorption of gas into a liquid is an exothermic process that liberates thermal energy. This released heat must be continuously...