MCQOPTIONS
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MCQOPTIONS
This section includes 70 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
In a centrifugal compressor, the flow of air is __________ to the axis of compressor. |
| A. | parallel |
| B. | perpendicular |
| C. | inclined |
| D. | none of these |
| Answer» C. inclined | |
| 52. |
The workdone on a compressor will be minimum if air is taken from |
| A. | the atmosphere |
| B. | a source at 0° C |
| C. | a source of low temperature air |
| D. | a source of high temperature air |
| Answer» D. a source of high temperature air | |
| 53. |
The compression ratio for the compressor is always __________ unity. |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» D. | |
| 54. |
The assumption made in two stage compression with intercooler is that |
| A. | there is no pressure drop in the intercooler |
| B. | the compression in both the cylinders is polytropic |
| C. | the suction and delivery of air takes place at constant pressure |
| D. | all of the above |
| Answer» E. | |
| 55. |
A simple turbo-jet engine is basically a gas turbine engine equipped with a propulsive nozzle and diffuser. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 56. |
The minimum work required for a three stage reciprocating air compressor is __________ the work required for each stage. |
| A. | equal to |
| B. | double |
| C. | three times |
| D. | six times |
| Answer» D. six times | |
| 57. |
For a multi-stage compressor, the polytropic efficiency is constant throughout for all the stages. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 58. |
The operation of the reciprocating air motor is similar to reciprocating air compressor. |
| A. | True |
| B. | False |
| Answer» C. | |
| 59. |
Standard air is the air at __________ and relative humidity of 36 percent. |
| A. | 0.1 bar and 20° C |
| B. | 1 bar and 20° C |
| C. | 0.1 bar and 40° C |
| D. | 1 bar and 40° C |
| Answer» C. 0.1 bar and 40° C | |
| 60. |
The volumetric efficiency of the compressor is defined as the ratio of volume of free air delivery per stroke to the swept volume of the piston. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 61. |
A compressor must be driven by some prime mover. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 62. |
Volumetric efficiency of a compressor decreases with __________ in compression ratio. |
| A. | decrease |
| B. | increase |
| Answer» C. | |
| 63. |
Slip factor in a centrifugal compressor indicates the amount of air leaked from the storage vessel. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 64. |
A turbo-prop is preferred to turbo-jet because |
| A. | it has high propulsive efficiency at high speeds |
| B. | it can fly at super sonic speeds |
| C. | it can fly at high elevations |
| D. | it has high power for take off |
| Answer» E. | |
| 65. |
The speed of rotary air compressor is __________ as compared to reciprocating air compressor. |
| A. | high |
| B. | low |
| Answer» B. low | |
| 66. |
The basic principle of the rocket propulsion is the same as that of jet propulsion. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 67. |
The overall thermal efficiency of an ideal gas turbine plant is (where = Pressure ratio) |
| A. | 1 - |
| Answer» D. | |
| 68. |
A centrifugal compressor is an axial flow compressor. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 69. |
The ratio of the isentropic work to the Euler's work is known as pressure coefficient. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 70. |
The degree of reaction is usually kept __________ for all types of axial flow compressors. |
| A. | 0.2 |
| B. | 0.3 |
| C. | 0.4 |
| D. | 0.5 |
| Answer» E. | |