Test: Compressors - 3 - Mechanical Engineering MCQ

A P-v diagram has been obtained from a test on a reciprocating compressor. Which of the following represents that diagram?

When is the work required for compression of an ideal gas between two pressures in a reciprocating compressor minimum?

Performance of a reciprocating compressor is expressed by

Which one of the following type of compressor is mostly used for supercharging of I.C. engine

Rotary compressor is best suited for

Roots blower is an example of

Centrifugal compressors are suitable for large discharge and wider mass flow range, but at a relatively low discharge pressure of the order of 10 bars, because of

In a centrifugal compressor assuming the same overall dimensions, blade inlet angle and rotational speeds, which of the following bladings will given the maximum pressure rise?

The usual assumption in elementary compressor cascade theory is that

What, docs application of centrifugal air compressors lead to?

Degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the

Surging basically implies

Phenomenon of choking in compressor means

The flow in the vaneless space between the impeller exit and diffuser inlet of a centrifugal compressor can be assumed as

The optimum intermediate pressure p₁ for a gas turbine plant operating between pressure limits p₁ and p₂ with perfect intercooling between the two stages of compression (with identical isentropic efficiency) is given by

Consider a two stage reciprocating air compressor with a perfect intercooler operating at the best intermediate pressure. Air enters the low pressure cylinder at 1 bar, 27°C and leaves the high pressure cylinder at 9 bar. Assume the index of compression and expansion in each stage is 1.4, and that for air R - 286.7 J/kg K, the work done per kg air in the high pressure cylinder is [Take 3^0.286 = 1.37]

Air (c_p = 1 kJ/kgK, γ - 1.4) enters a compressor at a temperature of 27°C. The compressor pressure ratio is 4. Assuming an efficiency of 80%, the compressor work required in kJ/kg is [Take 0.25^0.286 = 0.67]