MCQOPTIONS
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MCQOPTIONS
This section includes 219 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
The type of rotary compressor used in gas turbines, is of |
| A. | centrifugal type |
| B. | axial flow type |
| C. | radial flow type |
| D. | none of these |
| Answer» C. radial flow type | |
| 202. |
The inlet pressure is always __________ the discharge pressure. |
| A. | equal to |
| B. | less than |
| C. | more than |
| D. | - |
| Answer» C. more than | |
| 203. |
The clearance volume in the compressor is kept minimum because it effects on volumetric efficiency. |
| A. | Correct |
| B. | Incorrect |
| C. | - |
| D. | - |
| Answer» B. Incorrect | |
| 204. |
The ratio of workdone per cycle to the stroke volume of the compressor is known as |
| A. | compressor capacity |
| B. | compression ratio |
| C. | compressor efficiency |
| D. | mean effective pressure |
| Answer» E. | |
| 205. |
For a two stage reciprocating compressor, compression from p 1 to p 3 is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is p a , then the intermediate pressure p 2 is given by |
| A. | p 2 = ( p 1 + p 3 )/2 |
| B. | p 2 = p 1 . p 3 |
| C. | P 2 = P a x p 3 / p 1 |
| D. | p 2 = p a p 3 / p 1 |
| Answer» C. P 2 = P a x p 3 / p 1 | |
| 206. |
Intercooling in multi-stage compressors is done |
| A. | to cool the air during compression |
| B. | to cool the air at delivery |
| C. | to enable compression in two stages |
| D. | to minimise the work of compression |
| Answer» E. | |
| 207. |
The capacity of a compressor is expressed in |
| A. | kg/m 2 |
| B. | kg/m 3 |
| C. | m 3 /min |
| D. | m 3 /kg |
| Answer» D. m 3 /kg | |
| 208. |
The maximum delivery pressure in a rotary air compressor is |
| A. | 10 bar |
| B. | 20 bar |
| C. | 30 bar |
| D. | 50 bar |
| Answer» B. 20 bar | |
| 209. |
The increase in pressure in a vane blower takes place first due to compression and then due to back flow of air. |
| A. | Correct |
| B. | Incorrect |
| C. | - |
| D. | - |
| Answer» B. Incorrect | |
| 210. |
In a single acting reciprocating compressor, the suction, compression and delivery of air takes place in __________ of the piston. |
| A. | one stroke |
| B. | two strokes |
| C. | three strokes |
| D. | four strokes |
| Answer» C. three strokes | |
| 211. |
An open cycle gas turbine works on the same cycle as that of a closed cycle gas turbine. |
| A. | Yes |
| B. | No |
| C. | - |
| D. | - |
| Answer» B. No | |
| 212. |
In a jet propulsion |
| A. | the propulsive matter is ejected from within the propelled body |
| B. | the propulsive matter is caused to flow around the propelled body |
| C. | its functioning does not depend upon presence of air |
| D. | none of the above |
| Answer» C. its functioning does not depend upon presence of air | |
| 213. |
The total heat rejected in a reciprocating air compressor is equal to the sum of the heat rejected during polytropic compression per kg of air and heat rejected in the intercooler per kg of air. |
| A. | True |
| B. | False |
| C. | - |
| D. | - |
| Answer» B. False | |
| 214. |
The stagnation pressure rise in a centrifugal compressor takes place |
| A. | in the diffuser only |
| B. | in the impeller only |
| C. | in the diffuser and impeller |
| D. | in the inlet guide vanes only |
| Answer» D. in the inlet guide vanes only | |
| 215. |
The rotary compressors are suitable for large discharge of air at low pressure. |
| A. | True |
| B. | False |
| C. | - |
| D. | - |
| Answer» B. False | |
| 216. |
The maximum temperature in a gas turbine is |
| A. | 200°C |
| B. | 500°C |
| C. | 700°C |
| D. | 1000°C |
| Answer» D. 1000°C | |
| 217. |
The volumetric efficiency for reciprocating air compressors is about |
| A. | 10 to 40% |
| B. | 40 to 60% |
| C. | 60 to 70% |
| D. | 70 to 90% |
| Answer» E. | |
| 218. |
A rocket works with maximum overall efficiency when air-craft velocity is __________ the jet velocity. |
| A. | equal to |
| B. | one-half |
| C. | double |
| D. | - |
| Answer» C. double | |
| 219. |
In a four stage compressor, if the pressure at the first and third stage are 1 bar and 16 bar, then the delivery pressure at the fourth stage will be |
| A. | 1 bar |
| B. | 16 bar |
| C. | 64 bar |
| D. | 256 bar |
| Answer» D. 256 bar | |