Home » Mechanical Engineering » Compressors, Gas Dynamics and Gas Turbines

Single-acting reciprocating compressor: strokes for suction, compression, and delivery In a single-acting reciprocating air compressor, over how many piston strokes do suction, compression, and delivery occur? Choose the correct option.

Difficulty: Easy

One stroke
Two strokes
Three strokes
Four strokes

Correct Answer: Two strokes

Explanation:

Concept/Approach
In a single-acting cylinder, suction occurs during one piston stroke (e.g., downward), while compression and delivery occur during the opposite stroke (e.g., upward) as the discharge valve opens once cylinder pressure exceeds delivery pressure.

Sequence
Stroke 1: Suction.Stroke 2: Compression & Delivery.

Final Answer
Two strokes

← Previous Question Next Question→

More Questions from Compressors, Gas Dynamics and Gas Turbines

Effect of clearance volume on compression work per kg in reciprocating compressors In a reciprocating air compressor, how does the compression work per kilogram of air vary with clearance volume (other conditions fixed)? Choose the correct option.
Compressor operating pressures: inlet versus discharge Complete the statement about compressor operation. The inlet pressure is always __________ the discharge pressure. Choose the correct option.
Typical volumetric efficiency range for reciprocating air compressors What is the usual range of volumetric efficiency for practical reciprocating air compressors under normal conditions? Choose the correct option.
Intercooling between stages of air compression: effect on required power Statement: Intercooling in multistage air compressors saves power when compressing a given volume of air to a given final pressure (compared to no intercooling). Decide whether the statement is correct.
Rotary air compressors: typical maximum delivery pressure What is a representative maximum delivery pressure achievable with rotary air compressors (e.g., roots/rotary screw) in single-stage practice? Choose the correct option.
Gas turbines vs. steam turbines: identify the true comparative statements in power-plant practice. Gas turbine plants are compact and include a compressor and a combustion chamber. Overall (simple-cycle) efficiency is typically lower than that of steam turbine plants under similar conditions. Choose the option that best summarizes these facts.
Two-stage reciprocating air compressors: find the incorrect statement (if any). Consider intercooling, minimum work allocation per stage, and the definition of volumetric efficiency. Determine which statement is wrong; if all are correct, select 'none of the above'.
Aircraft propellers: identify the correct propulsion description. Choose the statement that correctly describes how propellers produce thrust for aircraft flight.
Prime movers for rotary compressors: identify feasible drives. Rotary compressors in industry can be coupled to different prime movers. Select the correct statement about typical drive sources.
Peak combustion pressure comparison: gas turbines vs. I.C. engines. Complete the statement: The maximum combustion pressure in a gas turbine is __________ as compared to that in an internal-combustion (reciprocating) engine. Choose the most accurate relation.

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion