31. In an axial flow compressor, the ratio of pressure in theTOtor blades to the pressure rise in the compressor in one stage is known as
work factor
slip factor
degree of reaction
pressure coefficient
✅ The correct answer is option C.
Compressors, Gas Dynamics and Gas Turbines MCQs
32. The volume of air delivered in a medium capacity air compressor per unit time is
0.1 to 1.2 m3/s
0.15 to 5 m3/s
above 5 m3/s
none of these
✅ The correct answer is option B.
33. For maximum work, the reheating should be done to an intermediate pressure of (where p1 = Maximum pressure, and p2 = Minimum pressure)
p1p2
✅ The correct answer is option D.
34. With the decrease in compression ratio, the volumetric efficiency
does not change
increases
decreases
✅ The correct answer is option B.
35. In a double acting compressor, the air is compressed
in one cylinder
in two cylinders
in a single cylinder on both sides of the piston
in two cylinders on bo
✅ The correct answer is option C.
36. The ratio of the isentropic work to the Euler’s work is known as pressure coefficient.
Yes
No
✅ The correct answer is option A.
37. In a closed cycle gas turbine, the air is compressed
isothermally
polytropically
isentropically
none of these
✅ The correct answer is option C.
38. When the outlet angle from the rotor of a centrifugal compressor is more than 90°, then the blades are said to be
forward curved
backward curved
radial
none of these
✅ The correct answer is option A.
39. In a centrifugal compressor, the air enters the impeller axially and leaves the vane radially.
Yes
No
✅ The correct answer is option B.
40. In a jet engine, the air-fuel ratio is
30:01:00
40:01:00
50:01:00
60:01:00
✅ The correct answer is option D.