MCQOPTIONS
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MCQOPTIONS
This section includes 2670 Mcqs, each offering curated multiple-choice questions to sharpen your Railways knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Consider the following statements: Linear programming model can be applied to 1. Line balancing problem 2. Transportation problem 3. Project management Of these statements: |
| A. | 1, 2 and 3 are correct |
| B. | 1 and 2 are correct |
| C. | 2 and 3 are correct |
| D. | 1 and 3 are correct |
| Answer» C. 2 and 3 are correct | |
| 202. |
When a burnt out hermetic compressor is replaced by a new one it is desirable to include in the system a large drier-cum-strainer also. This is to be placed in: |
| A. | Liquid line |
| B. | Suction line |
| C. | Hot gas line |
| D. | Discharge line |
| Answer» E. | |
| 203. |
A gas turbine cycle with infinitely large number of stages during compression and expansion leads to which one of the following? |
| A. | Stirling cycle |
| B. | Atkinson cycle |
| C. | Ericsson cycle |
| D. | Brayton cycle |
| Answer» D. Brayton cycle | |
| 204. |
Which of the following statements is not correct for the volumetric efficiency of a reciprocating air compressor? |
| A. | It decreases with increase in ambient temperature |
| B. | It increases with decrease in pressure ratio |
| C. | It increases with decrease in clearance ratio |
| D. | It decreases with increase in delivery pressure |
| Answer» E. | |
| 205. |
Two heavy rotating masses are connected by shafts of length \[{{l}_{1}},{{l}_{2}}\] and \[{{l}_{3}}\] and the corresponding diameters are island (/3.This system is reduced to a torsionally equivalent system having uniform diameter \[{{d}_{1}}\] of the shaft. The equivalent length of the shaft is equal to: |
| A. | \[{{l}_{1}}+{{l}_{2}}+{{l}_{3}}\] |
| B. | \[\frac{{{l}_{1}}+{{l}_{2}}+{{l}_{3}}}{3}\] |
| C. | \[{{l}_{1}}+{{l}_{2}}{{\left( \frac{{{d}_{1}}}{{{d}_{2}}} \right)}^{3}}+{{l}_{3}}{{\left( \frac{{{d}_{1}}}{{{d}_{3}}} \right)}^{3}}\] |
| D. | \[{{l}_{1}}+{{l}_{2}}{{\left( \frac{{{d}_{1}}}{{{d}_{2}}} \right)}^{4}}+{{l}_{3}}{{\left( \frac{{{d}_{1}}}{{{d}_{3}}} \right)}^{4}}\] |
| Answer» E. | |
| 206. |
If a mass 'm' oscillates on a spring having a mass \[{{m}_{s}}\] and stiffness ?k?, then the natural frequency of the system is given by: |
| A. | \[\sqrt{\frac{k}{m+\frac{{{m}_{s}}}{3}}}\] |
| B. | \[\sqrt{\frac{k}{\frac{m}{3}+{{m}_{s}}}}\] |
| C. | \[\sqrt{\frac{3k}{m+{{m}_{s}}}}\] |
| D. | \[\sqrt{\frac{k}{m+{{m}_{s}}}}\] |
| Answer» B. \[\sqrt{\frac{k}{\frac{m}{3}+{{m}_{s}}}}\] | |
| 207. |
Suppose two rotors with inertias \[{{l}_{1}}\] and \[{{l}_{2}}\] on shafts of Length \[{{l}_{1}}\] and \[{{l}_{2}}\] respectively, are connected by gears such that the speed of the \[{{l}_{2}}\] rotor is always G times that of the \[{{l}_{2}}\] rotor. This system may, for vibration analysis, he treated as being on one shaft (integral with \[{{i}_{1}}\]) if: |
| A. | \[{{l}_{1}}\] is changed to \[{{G}^{2}}{{I}_{1}}\] |
| B. | \[{{I}_{2}}\] is changed to \[{{G}^{2}}{{I}_{2}}\] |
| C. | \[{{I}_{1}}\] is changed to \[{{\text{I}}_{\text{1}}}\text{/}{{\text{G}}^{\text{2}}}\] |
| D. | \[{{I}_{2}}\] is changed to \[{{\text{I}}_{2}}\text{/}{{\text{G}}^{\text{2}}}\] |
| Answer» C. \[{{I}_{1}}\] is changed to \[{{\text{I}}_{\text{1}}}\text{/}{{\text{G}}^{\text{2}}}\] | |
| 208. |
Transmissibility is unity at two points. Which one of the following is true for these two points? |
| A. | \[\frac{\omega }{{{\omega }_{n}}}\] is zero and \[\sqrt{3}\] for all values of damping |
| B. | \[\frac{\omega }{{{\omega }_{n}}}\] is zero and \[\sqrt{2}\] for all values of damping |
| C. | \[\frac{\omega }{{{\omega }_{n}}}\] is unity and 2 for all values of damping |
| D. | \[\frac{\omega }{{{\omega }_{n}}}\] is unity and \[\sqrt{3}\] for all values of damping. |
| Answer» C. \[\frac{\omega }{{{\omega }_{n}}}\] is unity and 2 for all values of damping | |
| 209. |
Which one of the following is the correct statement? Steam is said to be superheated when the |
| A. | Actual volume is greater than volume of saturated steam |
| B. | Actual volume is less than volume of saturated steam |
| C. | Actual volume is equal to volume of saturated steam |
| D. | None of the above |
| Answer» B. Actual volume is less than volume of saturated steam | |
| 210. |
Which one of the following is the extensive property of a thermodynamic system? |
| A. | Volume |
| B. | Pressure |
| C. | Temperature |
| D. | Density |
| Answer» B. Pressure | |
| 211. |
Reheat between multi-stage expansions Joule cycle increases 1. Overall work output 2. The work ratio 3. The thermal efficiency Which of the above are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 only |
| C. | 2 and 3 only |
| D. | 1 and 3 only |
| Answer» C. 2 and 3 only | |
| 212. |
Flow takes place at Reynolds number of 1500 in two different pipes with relative roughness of 0001 and 0002. The friction factor: |
| A. | Will be higher in case of pipe with relative roughness of 0001 |
| B. | Will be higher in case of pipe with relative ness of 0.002 |
| C. | Will be same in both pipes |
| D. | In the two pipes cannot be compared on the basis of data given |
| Answer» D. In the two pipes cannot be compared on the basis of data given | |
| 213. |
For a given discharge in a channel at critical depth: |
| A. | The specific energy is minimum |
| B. | The specific energy is maximum |
| C. | The total energy is minimum |
| D. | The total energy is maximum |
| Answer» B. The specific energy is maximum | |
| 214. |
16 Match List-I (NC machine tool systems) with List-II (Features) and select the correct answer using the codes given below the lists: List-I List-II A. NC system 1. It has an integrated automatic tool changing unit and a component indexing device B. CNC system 2. A number of machine tools arc controlled by a computer. No tape reader, the part programme is transmitted directly to the machine tool from the computer memory C. DNC system 3. The controller consists of soft-wired computer and hard-wired logic system. Graphic display of tool path is also possible D. Machining centre 4. The instruction on tape is prepared inbinary decimal form and operated by a series, of coded instructions Codes: |
| A. | A\[\to \]4, B\[\to \]2, C\[\to \]3, D\[\to \]1 |
| B. | A\[\to \]1, B\[\to \]3, C\[\to \]2, D\[\to \]4 |
| C. | A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 |
| D. | A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 |
| Answer» B. A\[\to \]1, B\[\to \]3, C\[\to \]2, D\[\to \]4 | |
| 215. |
Which one of the following sets of elements are quick-acting clamping elements for fixtures? |
| A. | Wedge and Cam |
| B. | Cam and Toggle |
| C. | Toggle and Wedge |
| D. | Wedge, Cam and Toggle |
| Answer» B. Cam and Toggle | |
| 216. |
The size of the cam depends upon: |
| A. | Base circle |
| B. | Pitch circle |
| C. | Prime circle |
| D. | None of these |
| Answer» B. Pitch circle | |
| 217. |
Earth Least preferred for earthling is |
| A. | earth mixed with salt and charcoal |
| B. | dry earth |
| C. | mashy ground containing brine waste |
| D. | clay soil |
| Answer» C. mashy ground containing brine waste | |
| 218. |
If the ratio of the length of connecting rod to the crank radius increases, then: |
| A. | Primary unbalanced forces will increase |
| B. | Primary unbalanced forces-will decrease |
| C. | Secondary unbalanced forces will increase |
| D. | Secondary unbalanced forces will decrease |
| Answer» E. | |
| 219. |
Match List-I (Cycle) with List-II (Process) and select the correct answer using the codes given below the lists: List-I (Cycle) List-II (Process) A. Otto 1. Two isothermal and two constant volume B. Stirling 2. Two isothermal and two isobar C. Ericsson 3. Two isentropic and two isobar D. Brayton 4. Two isentropic and two constant volume 5. Two isentropic and two isothermal Codes: |
| A. | A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 |
| B. | A\[\to \]4, B\[\to \]1, C\[\to \]3, D\[\to \]5 |
| C. | A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]5 |
| D. | A\[\to \]1, B\[\to \]4, C\[\to \]5, D\[\to \]3 |
| Answer» B. A\[\to \]4, B\[\to \]1, C\[\to \]3, D\[\to \]5 | |
| 220. |
For a compression or heating process, what is the expression for effectiveness\[\varepsilon \]? |
| A. | \[\varepsilon \,\,=\,\,\frac{Increase\,\,of\,\,availability\,\,of\,\,the\,\,surroundings}{Loss\,\,of\,\,availability\,\,of\,\,the\,\,system}\] |
| B. | \[\varepsilon \,\,=\,\,\frac{Increase\,\,of\,\,availability\,\,of\,\,the\,\,system}{Loss\,\,of\,\,availability\,\,of\,\,the\,\,surroundings}\] |
| C. | \[\varepsilon \,\,=\,\,\frac{Loss\,\,of\,\,availability\,\,of\,\,the\,\,surroundings}{Increase\,\,of\,\,availability\,\,of\,\,the\,\,system}\] |
| D. | \[\varepsilon \,\,=\,\,\frac{Loss\,\,of\,\,availability\,\,of\,\,the\,\,system}{Increase\,\,of\,\,availability\,\,of\,\,the\,\,surroundings}\] |
| Answer» C. \[\varepsilon \,\,=\,\,\frac{Loss\,\,of\,\,availability\,\,of\,\,the\,\,surroundings}{Increase\,\,of\,\,availability\,\,of\,\,the\,\,system}\] | |
| 221. |
Consider the following statements: If at section distant from one of the ends of the beam, M represents the bending moment, V the shear force and w the intensity of loading, then 1. dM/dx = V 2. dV/dx = w 3. dw/dx = y (the deflection of the beam at the section) Of these statements: |
| A. | 1 and 3 are correct |
| B. | 1 and 2 are correct |
| C. | 2 and 3 are correct |
| D. | 1, 2 and 3 are correct |
| Answer» C. 2 and 3 are correct | |
| 222. |
From a tension test, the yield strength of steel is found to be \[200\,\text{N/m}{{\text{m}}^{\text{2}}}\text{.}\] Using a factor of safety of 2 and applying maximum principal stress theory of failure, the permissible stress in the steel shaft subjected to torque will be: |
| A. | \[50\,\text{N/m}{{\text{m}}^{\text{2}}}\] |
| B. | \[57.7\,\text{N/m}{{\text{m}}^{\text{2}}}\] |
| C. | \[86.6\,\text{N/m}{{\text{m}}^{\text{2}}}\] |
| D. | \[100\,\text{N/m}{{\text{m}}^{\text{2}}}\] |
| Answer» E. | |
| 223. |
A rectangular section beam subjected to a bending moment M varying along its length is required to develop same maximum bending stress at any cross- section. If the depth of the section is constant, then its width will vary as: |
| A. | \[M\] |
| B. | \[\sqrt{M}\] |
| C. | \[{{M}_{2}}\] |
| D. | \[\text{1/M}\] |
| Answer» B. \[\sqrt{M}\] | |
| 224. |
A solid shaft of diameter 100 mm, length 1000 mm is subjected to a twisting moment 'T'. The maximum shear stress developed in the shaft is 60 N/mm. A hole of 50 mm diameter is now drilled throughout the length of shaft. To develop a maximum shear stress of 60 N/ mm in the hollow shaft, the torque 'T' must he reduced by |
| A. | T/4 |
| B. | T/8 |
| C. | T/12 |
| D. | T/16 |
| Answer» E. | |
| 225. |
Match List-I (Methods) with List-II (Applications) and select the correct answer using the codes given below the lists: List-I List-II A. Breakeven analysis 1. To provide different facility at different B. Transportation 2. To take action from among the paths with uncertainty. C. Assignment problem 3. To choose between different methods of Manufacture D. Decision tree 4. To determine the location of the additional plant Codes: |
| A. | A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]2 |
| B. | A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| C. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| D. | A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 |
| Answer» C. A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 | |
| 226. |
A variable which has no physical meaning, but is used to obtain an initial basic feasible solution to the linear programming problem is referred to as: |
| A. | Basic variable |
| B. | Non-basic variable |
| C. | Artificial variable |
| D. | Basis |
| Answer» B. Non-basic variable | |
| 227. |
If n the polytropic index of compressor and \[\frac{{{p}_{2}}}{{{p}_{1}}}\] is the pressure ratio for a three-stage compressor with ideal intercoolling, the on total work of three stage is: |
| A. | \[\frac{3n}{(n-1)}{{p}_{1}}{{v}_{1}}\,\left\{ {{\left( \frac{{{p}_{2}}}{{{p}_{1}}} \right)}^{(n-1)/n}}-1 \right\}\] |
| B. | \[\frac{n}{(n-1)}{{p}_{1}}{{v}_{1}}\,\left\{ {{\left( \frac{{{p}_{2}}}{{{p}_{1}}} \right)}^{(n-1)/n\,3}}-1 \right\}\] |
| C. | \[\frac{n}{(n-1)}{{p}_{1}}{{v}_{1}}\,\left\{ {{\left( \frac{{{p}_{2}}}{{{p}_{1}}} \right)}^{(n-1)/n}}-1 \right\}\] |
| D. | \[\frac{3n}{(n-1)}{{p}_{1}}{{v}_{1}}\,\left\{ {{\left( \frac{{{p}_{2}}}{{{p}_{1}}} \right)}^{(n-1)/\,3\,n}}-1 \right\}\] |
| Answer» E. | |
| 228. |
For a two-stage reciprocating air compressor, the suction pressure is 1.5 bar and the delivery pressure is 54 bar. What is the value of the ideal intercooler pressure? |
| A. | 6 bar |
| B. | 9 bar |
| C. | 27.75 bar |
| D. | \[\frac{9}{\sqrt{12}}\] bar |
| Answer» B. 9 bar | |
| 229. |
Which one of the following is the expression of the rotational component for a two-dimensional fluid element in \[x-y\]plane? |
| A. | \[{{\omega }_{z}}=\frac{1}{2}\,\left( \frac{\partial v}{\partial x}-\frac{\partial u}{\partial y} \right)\] |
| B. | \[{{\omega }_{z}}=\frac{1}{2}\,\left( \frac{\partial v}{\partial x}-\frac{\partial u}{\partial y} \right)\] |
| C. | \[{{\omega }_{z}}=\frac{1}{2}\,\left( \frac{\partial v}{\partial x}-\frac{\partial v}{\partial y} \right)\] |
| D. | \[{{\omega }_{z}}=\frac{1}{2}\,\left( \frac{\partial u}{\partial x}+\frac{\partial v}{\partial y} \right)\] |
| Answer» B. \[{{\omega }_{z}}=\frac{1}{2}\,\left( \frac{\partial v}{\partial x}-\frac{\partial u}{\partial y} \right)\] | |
| 230. |
The relationship between the Lame's constant \['\lambda '.\] Young's modulus 'E' and the Poisson's ratio 'v' is: |
| A. | \[\lambda =\frac{Ev}{(1+v)(1-2y)}\] |
| B. | \[\lambda =\frac{Ev}{(1+2v)(1-v)}\] |
| C. | \[\lambda =\frac{Ev}{(1+v)}\] |
| D. | \[\lambda =\frac{Ev}{(1-v)}\] |
| Answer» B. \[\lambda =\frac{Ev}{(1+2v)(1-v)}\] | |
| 231. |
Match List-I (Elastic properties of an isotropic elastic material) with0 List-II (Nature of strain produced) and select the correct answer using the codes given below the list: List-I List-II A. Young's modulus 1. Shear strain B. Modulus of rigidity 2. Normal strain C. Bulk modulus 3. Transverse strain D. Poisson's ratio 4. Volumetric strain Codes: |
| A. | A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 |
| B. | A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3 |
| C. | A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| D. | A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]2 |
| Answer» C. A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 | |
| 232. |
A 10 cm long and 5 cm diameter steel rod fits snugly between two rigid walls 10 cm apart at room temperature. Young's modulus of elasticity and coefficient of linear expansion of steel are \[2\times {{10}^{6}}\,\text{kg/c}{{\text{m}}^{\text{2}}}\] and \[12\times {{10}^{-\,6}}\] per \[{}^\circ C\] respectively. The stress developed in rod due to a \[100{}^\circ C\] rise in temperature will be: |
| A. | \[6\times {{10}^{-\,10}}\,\text{kg/c}{{\text{m}}^{\text{2}}}\] |
| B. | \[6\times {{10}^{-\,10}}\,\text{kg/c}{{\text{m}}^{\text{2}}}\] |
| C. | \[2.4\times {{10}^{3}}\,\text{kg/c}{{\text{m}}^{\text{2}}}\] |
| D. | \[2.4\times {{10}^{4}}\,\text{kg/c}{{\text{m}}^{\text{2}}}\] |
| Answer» D. \[2.4\times {{10}^{4}}\,\text{kg/c}{{\text{m}}^{\text{2}}}\] | |
| 233. |
Heat flows between two reservoirs having temperatures 1000 K and 500 K, respectively. If the entropy change of the cold reservoir is 10 kJ/K, then what is the entropy change for the hot reservoir? |
| A. | \[-\,\,10\,\,kJ/K\] |
| B. | \[-\,\,5\,\,kJ/K\] |
| C. | \[5\,\,kJ/K\] |
| D. | \[10\,\,kJ/K\] |
| Answer» E. | |
| 234. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I List-II A. Bottle filling of gas 1. Absolute zero temperature B. Nernst-Simon statement 2. Variable flow C. Joule-Thomson effect 3. Quasi-static path D. \[\int{p\,\,dv}\] 4. Isenthalpic process 5. Dissipative effect 6. Low grade energy 7. Pressure and temperature during phase change Codes: |
| A. | A\[\to \]6, B\[\to \]5, C\[\to \]4, D\[\to \]3 |
| B. | A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3 |
| C. | A\[\to \]2, B\[\to \]5, C\[\to \]7, D\[\to \]4 |
| D. | A\[\to \]6, B\[\to \]1, C\[\to \]7, D\[\to \]4 |
| Answer» C. A\[\to \]2, B\[\to \]5, C\[\to \]7, D\[\to \]4 | |
| 235. |
Which one of the following statements is true of flow around a submerged body? |
| A. | For subsonic, non-viscous flow, the drag is zero |
| B. | For supersonic flow the drag coefficient is dependent equally on Mach number and Reynolds number |
| C. | The lift and drag coefficient of an aerofoil is independent of Reynolds number |
| D. | For incompressible flow around an aerofoil, the profile drag is the sum of form drag and skin Friction drag. |
| Answer» C. The lift and drag coefficient of an aerofoil is independent of Reynolds number | |
| 236. |
The Klain's method of construction for reciprocating engine mechanism: |
| A. | Is a simplified version of instantaneous centre method |
| B. | Utilizes a quadrilateral similar to the diagram of mechanism for reciprocating engine |
| C. | Enables determination of Corioli's component |
| D. | Is based on the acceleration diagram |
| Answer» E. | |
| 237. |
Two co-axial rotors having moments of inertia \[{{I}_{1}},{{I}_{2}}\] and angular speeds \[{{\omega }_{1}}\] and \[{{\omega }_{2}}\] respectively are engaged together. The loss of energy during engagement is equal to: |
| A. | \[\frac{{{I}_{1}}{{I}_{2}}{{({{\omega }_{1}}-{{\omega }_{2}})}^{2}}}{2({{I}_{1}}+{{I}_{2}})}\] |
| B. | \[\frac{{{I}_{1}}{{I}_{2}}{{(\omega _{1}^{2}-\omega _{2}^{2})}^{2}}}{2({{I}_{1}}+{{I}_{2}})}\] |
| C. | \[\frac{2{{I}_{1}}{{I}_{2}}{{({{\omega }_{1}}-{{\omega }_{2}})}^{2}}}{({{I}_{1}}+{{I}_{2}})}\] |
| D. | \[\frac{{{I}_{1}}\omega _{1}^{2}-{{I}_{2}}\omega _{2}^{2}}{({{I}_{1}}+{{I}_{2}})}\] |
| Answer» B. \[\frac{{{I}_{1}}{{I}_{2}}{{(\omega _{1}^{2}-\omega _{2}^{2})}^{2}}}{2({{I}_{1}}+{{I}_{2}})}\] | |
| 238. |
Match List I with List II and select the correct answer using the codes given below the lists: List-I List-II A. Linear programming problem 1. Travelling salesman B. Queuing problem 2. Saddle point C. Dynamic problem 3. Product mix D. Game theory problem 4. Normal distribution Codes: |
| A. | A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| B. | A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]2 |
| C. | A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| D. | A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 |
| Answer» B. A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]2 | |
| 239. |
A simple table for a linear programming problem is given below: 5 2 3 0 0 0 \[{{X}_{1}}\] \[{{X}_{2}}\] \[{{X}_{3}}\] \[{{X}_{4}}\] \[{{X}_{5}}\] \[{{X}_{6}}\] Z \[{{X}_{4}}\] 1 2 2 1 0 0 8 \[{{X}_{5}}\] 3 4 1 0 1 1 7 \[{{X}_{6}}\] 2 3 4 0 0 1 10 Which one of the following correctly indicates the combination of entering and leaving variable? |
| A. | \[{{X}_{1}}\] and \[{{X}_{4}}\] |
| B. | \[{{X}_{2}}\] and \[{{X}_{6}}\] |
| C. | \[{{X}_{2}}\] and \[{{X}_{5}}\] |
| D. | \[{{X}_{3}}\] and \[{{X}_{4}}\] |
| Answer» D. \[{{X}_{3}}\] and \[{{X}_{4}}\] | |
| 240. |
The diameter of a \[50-SWG\]wire is closer to |
| A. | 0.0253 mm |
| B. | 0.05 mm |
| C. | 0.16 mm |
| D. | 0.52 mm |
| Answer» B. 0.05 mm | |
| 241. |
Consider the following statements: For a single-stage water cooled air compressor, 1. The volumetric efficiency decreases as the pressure ratio is increased. 2. Shaft power/\[{{m}^{3}}\]/min of free air increases as the pressure ratio is increased. Which of the statements given above is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | Both 1 and 2 |
| D. | neither 1 nor 2 |
| Answer» D. neither 1 nor 2 | |
| 242. |
Pulse jet engine operation can be idealized/approximated to follow which one of the following? |
| A. | Brayton cycle |
| B. | Ericsson cycle |
| C. | Lenoir cycle |
| D. | Stirling cycle |
| Answer» D. Stirling cycle | |
| 243. |
In aircraft gas turbines, the axial flow compressor is preferred because: |
| A. | Of high pressure rise |
| B. | It is stall free |
| C. | Of low frontal area |
| D. | Of higher thrust |
| Answer» D. Of higher thrust | |
| 244. |
Consider the following parameters: 1. Limit of peripheral speed 2. Limit of centrifugal stress 3. Coefficient of fluctuation of speed 4. Weight of the rim Which of these parameters are used in the calculation of the diameter of flywheel rim? |
| A. | 1, 3 and 4 |
| B. | 2, 3 and 4 |
| C. | 1, 2 and 3 |
| D. | 1, 2 and 4 |
| Answer» B. 2, 3 and 4 | |
| 245. |
Consider the following speed governors: 1. Porter governor 2. Hartnell governor 3. Watt governor 4. Proell governor. The correct sequence of development of these governors is: |
| A. | 1, 3, 2, 4 |
| B. | 3, 1, 4, 2 |
| C. | 3, 1, 2, 4 |
| D. | 1, 3, 4, 2 |
| Answer» C. 3, 1, 2, 4 | |
| 246. |
When the outlet angle from the rotor of a centrifugal compressor is more than \[90{}^\circ ,\] then the blades are said to be: |
| A. | Forward curved |
| B. | Backward curved |
| C. | Radial |
| D. | Either backward or forward curved. |
| Answer» B. Backward curved | |
| 247. |
According to fan laws, which of the following relation is valid? (Q \[-\] discharge, N \[-\] speed, D \[-\] diameter) Subscripts 1 and 2 for two sets of conditions): |
| A. | \[\left( \frac{{{Q}_{1}}}{{{Q}_{2}}} \right)={{\left( \frac{{{N}_{1}}}{{{N}_{2}}} \right)}^{2}}\] |
| B. | \[\left( \frac{{{Q}_{1}}}{{{Q}_{2}}} \right)={{\left( \frac{{{N}_{1}}}{{{N}_{2}}} \right)}^{3}}\] |
| C. | \[\left( \frac{{{Q}_{1}}}{{{Q}_{2}}} \right)={{\left( \frac{{{D}_{1}}}{{{D}_{2}}} \right)}^{2}}\] |
| D. | \[\left( \frac{{{Q}_{1}}}{{{Q}_{2}}} \right)={{\left( \frac{{{D}_{1}}}{{{D}_{2}}} \right)}^{3}}\] |
| Answer» E. | |
| 248. |
What is the ratio of the slopes for p?v curves for an adiabatic process and an isothermal process? |
| A. | \[{1}/{\gamma }\;\] |
| B. | \[\gamma +1\] |
| C. | \[\gamma \] |
| D. | \[\frac{1}{\gamma +1}\] |
| Answer» D. \[\frac{1}{\gamma +1}\] | |
| 249. |
The equation of state \[pv=R\,T\,\,(1+{B}/{v+{C}/{{{v}^{2}}+{D}/{{{v}^{3}}+...)}\;}\;}\;\] is known as: |
| A. | Van der Waals equation |
| B. | Benedict-Webb-Rubin equation |
| C. | Gibbs equation |
| D. | Virial equation. |
| Answer» E. | |
| 250. |
If the surface tension of water-air interface is 0.073 N/m, the gauge pressure inside a rain drop of 1 mm diameter will be: |
| A. | \[0.146\,\,\text{N/}{{\text{m}}^{\text{2}}}\] |
| B. | \[0.73\,\,\text{N/}{{\text{m}}^{\text{2}}}\] |
| C. | \[146\,\,\text{N/}{{\text{m}}^{\text{2}}}\] |
| D. | \[292\,\,\text{N/}{{\text{m}}^{\text{2}}}\] |
| Answer» E. | |