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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.
| 151. |
Permissible bending moment in a circular shaft under pure bending is M according to maximum principal stress theory of failure. According to maximum shear stress theory of failure, the permissible bending moment in the same shaft is: |
| A. | 1/2M |
| B. | M |
| C. | \[\sqrt{M}\] |
| D. | 2M |
| Answer» C. \[\sqrt{M}\] | |
| 152. |
A circular shaft is subjected to the combined action of bending, twisting and direct axial loading. The maximum bending stress \[\sigma \]maximum shearing stress \[\sqrt{3\sigma }\] and a uniform axial stress \[\sigma \](compressive) are produced. The \[\sigma \]maximum compressive normal stress produced in the shaft will be |
| A. | \[3\,\sigma \] |
| B. | \[2\,\sigma \] |
| C. | \[\sigma \] |
| D. | Zero |
| Answer» C. \[\sigma \] | |
| 153. |
Deep groove ball bearings are used for |
| A. | heavy thrust load only |
| B. | small angular displacement of shafts |
| C. | radial load at high speed |
| D. | combined thrust and radial loads at high speed |
| Answer» E. | |
| 154. |
For the two shafts in parallel, find which statements is true? |
| A. | Torque in each shaft is the same |
| B. | Shear stress in each shaft is the same |
| C. | Angle of twist of each shaft is the same |
| D. | Torsional stiffness of each shaft is the same |
| Answer» D. Torsional stiffness of each shaft is the same | |
| 155. |
A vertical hanging bar of length L and weighing w N/unit length carries a load W at the bottom. The tensile force in the bar at a distance y from the support will be given by: |
| A. | \[W+wL\] |
| B. | \[W+w\,(L-y)\] |
| C. | \[(W+w)\,\text{y/L}\] |
| D. | \[W+\frac{W}{w}(L-y)\] |
| Answer» B. \[W+w\,(L-y)\] | |
| 156. |
Two reversible engines are working in series between a high temperature reservoir at 1000 K and a low temperature reservoir at 300 K in such a way that the heat rejected by the preceding engine is completely absorbed by the succeeding engine and both the engines develop the same amount of work per cycle. What is the intermediate temperature between first and second engines? |
| A. | 700 K |
| B. | 650 K |
| C. | 350 K |
| D. | Not possible to be estimated with the given data |
| Answer» C. 350 K | |
| 157. |
In the case of an elastic bar fixed at upper end loaded by a falling weight at lower end, the shock olad produced can be decreased by |
| A. | decreasing the cross-section area of bar |
| B. | increasing the cross-section area of bar |
| C. | remain unaffected with cross-section area |
| D. | would depend upon other factors |
| Answer» B. increasing the cross-section area of bar | |
| 158. |
A cantilever beam carries a load W uniformly distributed over its entire length. If the same load is placed at the free and of the same cantilever, then the ratio of maximum deflection in the first case to that in the second case will be: |
| A. | 3/8 |
| B. | 44263 |
| C. | 5/8 |
| D. | 44324 |
| Answer» B. 44263 | |
| 159. |
If the shear force acting at every section of a beam is of the same magnitude and of the same direction then it represents a: |
| A. | Simply supported beam with a concentrated load at the centre |
| B. | Overhung beam having equal overhang at both supports and carrying equal concentrated loads acting in the same direction at the free ends |
| C. | Cantilever subjected to concentrated load at the free end |
| D. | Simply supported beam having concentrated loads of equal magnitude and in the same direction acting at equal distances from the supports |
| Answer» D. Simply supported beam having concentrated loads of equal magnitude and in the same direction acting at equal distances from the supports | |
| 160. |
'Match List-I with List-II and select the correct answer using the codes given below the list: List-I List-II A. Bending moment is constant 1. Point of contra-flexure B. Bending moment is maximum or minimum 2. Shear force changes sign C. Bending moment is zero 3. Slope of shear force diagram is zero over the portion of the beam D. Loading is constant 4. Shear force is zero over the portion of the beam. Codes: |
| A. | A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 |
| B. | A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 |
| C. | A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 |
| D. | A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]2 |
| Answer» D. A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]2 | |
| 161. |
When there are 'm' rows and 'n' columns in a transposition problem, degeneracy is said to occur when the number of allocations is: |
| A. | Less than \[(m+n\,-1)\] |
| B. | Greater than \[(m+n\,-1)\] |
| C. | Equal to \[(m\,-n\,-1)\] |
| D. | Less than \[(m\,-n\,-1)\] |
| Answer» B. Greater than \[(m+n\,-1)\] | |
| 162. |
Consider the following aspects: 1. Speed 2. Decision making 3. Accuracy 4. Cost savings. The advantages of computers include: |
| A. | 1, 2 and 3 |
| B. | 2 and 4 |
| C. | 1, 3 and 4 |
| D. | 1, 2, 3 and 4 |
| Answer» D. 1, 2, 3 and 4 | |
| 163. |
In the case of a flywheel, the maximum fluctuation of energy is the: |
| A. | Sum of maximum and minimum energies |
| B. | Difference between the maximum and minimum energies |
| C. | Ratio of the maximum and minimum energy |
| D. | Ratio of the minimum and maximum energy |
| Answer» C. Ratio of the maximum and minimum energy | |
| 164. |
Match List-I with List-II and select the correct answer using the codes given below the Lists: List-I List-II A. Compound train 1. Hart mechanism B. Quick return mechanism 2. Coriolis force C. Exact straight line motion 3. Transmission of motion around bends and comers D. Approximate straight line motion 4. Watt mechanism Codes: |
| A. | A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 |
| B. | A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 |
| C. | A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| D. | A\[\to \]1, B\[\to \]4, C\[\to \]3, D\[\to \]2 |
| Answer» C. A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 | |
| 165. |
The natural frequency of an undamped vibrating system is 100 rad/s. A damper with a damping factor of 0.8 is introduced into the system. The frequency of vibration of the damped system, in rad/s, is: |
| A. | 60 |
| B. | 75 |
| C. | 80 |
| D. | 100 |
| Answer» B. 75 | |
| 166. |
A mass m attached to a light spring oscillates with a period of 2 sec. If the mass is increased by 2 kg, the period increases by 1 sec. The value ofwis: |
| A. | 1kg |
| B. | 1.6 kg |
| C. | 2 kg |
| D. | 2.4 kg |
| Answer» C. 2 kg | |
| 167. |
Reheating in a gas turbine: |
| A. | Increases the compressor work |
| B. | Decreases the compressor work |
| C. | Increases the turbine work |
| D. | Decreases the turbine work |
| Answer» D. Decreases the turbine work | |
| 168. |
A gas turbine works on which one of the following cycles? |
| A. | Brayton |
| B. | Rankine |
| C. | Stirling |
| D. | Otto |
| Answer» B. Rankine | |
| 169. |
A 3 - stage reciprocating compressor has suction pressure of 1 bar delivery pressure of 27 bar. For minimum work of compression, the delivery pressure of 1st stage is: |
| A. | 14 bar |
| B. | 9 bar |
| C. | 5.196 bar |
| D. | 3 bar |
| Answer» E. | |
| 170. |
In manual programming and tape preparation for an NC drilling machine, the spindle speed was coded as S 684 (using the magic-three code). The spindle speed in rpm will be: |
| A. | 684 |
| B. | 68.4 |
| C. | 840 |
| D. | 6840 |
| Answer» B. 68.4 | |
| 171. |
Which of the following pairs are correctly matched? 1. CNC machine......... Post processor. 2. Machining centre........... Tool magazine 3. DNC.......... FMS |
| A. | 1, 2 and 3 |
| B. | 1 and 2 |
| C. | 1 and 3 |
| D. | 2 and 3 |
| Answer» B. 1 and 2 | |
| 172. |
From design point of view, spherical pressure vessel are preferred over cylindrical pressure vessels because they: |
| A. | Are cost effective in fabrication |
| B. | Have uniform higher circumferential stress |
| C. | Uniform lower circumferential stress |
| D. | Have a larger volume for the same quantity of material used |
| Answer» D. Have a larger volume for the same quantity of material used | |
| 173. |
Which of the following statements are correct? 1. For constant velocity ratio transmission between two gears, the common normal at the point of contact must always pass through a fixed point on the line joining the centres of rotation of the gears. 2. For involute gears the pressure angle changes with change in centre distance between gears. 3. The velocity ratio of compound gear train depends upon the number of teeth of the input and output gears only. 4. Epicyclic gear trains involve rotation of at least one gear axis about some other gear axis. |
| A. | 1, 2 and 3 |
| B. | 1 and 3 |
| C. | 1, 2 and 4 |
| D. | 2, 3 and 4 |
| Answer» D. 2, 3 and 4 | |
| 174. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I List-II A. Hunting 1. One radius of rotation for each speed. B. Isochronism 2. Too sensitive C. Stability 3. Mean force exerted at the sleeve during change of speed D. Effort 4. Constant equilibrium speed for various radii of rotation Codes: |
| A. | A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]3 |
| B. | A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]3 |
| C. | A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3 |
| D. | A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 |
| Answer» B. A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]3 | |
| 175. |
A solid circular shaft is subjected to pure torsion. The ratio of maximum shear stress to maximum norms stress at any point would be |
| A. | 1 : 1 |
| B. | 0.0430555555555556 |
| C. | 2 : 1 |
| D. | 0.0854166666666667 |
| Answer» B. 0.0430555555555556 | |
| 176. |
Consider the following statements about modification? gas turbine power plant working en a simple Brayton cycle: 1. Incorporation of regeneration process increases specific work output as well as thermal efficiency. 2. Incorporation of regeneration process increases thermal efficiency but specific work output remains unchanged. 3. Incorporation of intercooling process in a multi- stage compression increases specific work output but the heat input also increases. 4. Incorporation of intercooling process in a multi-stage compression system increases specific work output, but the heat addition remains un-changed. Which of the above statements are correct? |
| A. | 1 and 3 |
| B. | 1 and 4 |
| C. | 2 and 3 |
| D. | 2 and 4 |
| Answer» E. | |
| 177. |
High positive incidence in an axial compressor blade raw leads to: |
| A. | Suppression of separation of flow on the blade |
| B. | Choking of the flow |
| C. | Separation of flow on the pressure side of the blade |
| D. | Separation of flow on the suction side of the blade. |
| Answer» B. Choking of the flow | |
| 178. |
A system executes a cycle there are four heat transfers: \[{{Q}_{12}}\,\,=\,220\,kJ,\] \[{{Q}_{23}}=-\,25\,\,kJ,\] \[{{Q}_{34}}=-\,180\,\,kJ,\] \[{{Q}_{41}}\,\,=\,\,50\,\,kJ.\] The work during three of the processes is: \[{{W}_{12}}=15\,\,kJ,\] \[{{W}_{23}}=-\,10\,\,kJ,\] \[{{W}_{34}}=60\,\,kJ.\]The work during the process \[4-1\] is: |
| A. | \[-\,\,230\,kJ\] |
| B. | 0 kJ |
| C. | 230 kJ |
| D. | 130 kJ |
| Answer» C. 230 kJ | |
| 179. |
If u, t, v, s, h and p refer to internal energy, temperature, volume, entropy, enthalpy and pressure respectively; and subscript 0 refers to environment conditions, availability function for a closed system is given by: |
| A. | \[u+{{p}_{0}}v-{{T}_{0}}s\] |
| B. | \[u-{{p}_{0}}v+{{T}_{0}}s\] |
| C. | \[h+{{p}_{0}}v+{{T}_{0}}s\] |
| D. | \[h-{{p}_{0}}v+{{T}_{0}}s\] |
| Answer» B. \[u-{{p}_{0}}v+{{T}_{0}}s\] | |
| 180. |
A tapering bar (diameters of end sections being \[{{d}_{1}}\] and\[{{d}_{2}}\]) and a bar of uniform cross-section 'd' have the same length and are subjected to the same axial pull. Both the bars will have the same extension if 'd' is equal to |
| A. | \[\frac{{{d}_{2}}+{{d}_{2}}}{2}\] |
| B. | \[\sqrt{{{d}_{1}}{{d}_{2}}}\] |
| C. | \[\sqrt{\frac{{{d}_{1}}{{d}_{2}}}{2}}\] |
| D. | \[\sqrt{\frac{{{d}_{2}}+{{d}_{2}}}{2}}\] |
| Answer» C. \[\sqrt{\frac{{{d}_{1}}{{d}_{2}}}{2}}\] | |
| 181. |
For most brittle materials, the ultimate strength in compression is much larger than the ultimate strength is tension. That is mainly due to: |
| A. | Presence of flaws and microscopic cracks or cavities |
| B. | Necking in tension |
| C. | Severity of tensile stress as compared to compressive stress |
| D. | non-linearity of stress-strain diagram. |
| Answer» B. Necking in tension | |
| 182. |
Which of the following is true (\[\mu =\] Poisson's ratio): |
| A. | \[0<\mu <-\text{1/2}\] |
| B. | \[1<\mu <0\] |
| C. | \[1<\mu <-1\] |
| D. | \[\infty <\mu <-\infty \] |
| Answer» B. \[1<\mu <0\] | |
| 183. |
At the eye tip of a centrifugal impeller, blade velocity is 200 m/s while the uniform axial velocity at the inlet is 150 m/s. If the sonic velocity is 300 m/s, then the inlet Mach number of the flow will be: |
| A. | 0.50 |
| B. | 0.66 |
| C. | 0.83 |
| D. | 0.87 |
| Answer» D. 0.87 | |
| 184. |
At constant efficiency, the horse power of a fan is: |
| A. | Proportional to rpm |
| B. | Proportional to \[{{(rpm)}^{2}}\] |
| C. | Proportional to \[{{(rpm)}^{3}}\] |
| D. | A polynomial function of rpm |
| Answer» C. Proportional to \[{{(rpm)}^{3}}\] | |
| 185. |
For a spring controlled governor to be stable. controlling force (F) is related to the radius (r) equation: |
| A. | \[F=ar-b\] |
| B. | \[F=ar+b\] |
| C. | \[F=ar\] |
| D. | \[F=\text{a/r}+b\] |
| Answer» B. \[F=ar+b\] | |
| 186. |
Consider the following statements: 1. Round bar in a round hole forms a turning pair. 2. A square bar in a square hole forms a sliding pair. 3. A vertical shaft in a foot-step bearing forms successful constraint. Which of these statements are correct? |
| A. | 1 and 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 187. |
In tape preparation for an NC machine tool the code S 624 would represent spindle speeds of: |
| A. | 624 rpm, 240 rpm and 246 rpm |
| B. | 624 rpm and 240 rpm |
| C. | 624 rpm and 246 rpm |
| D. | 240 rpm and 246 rpm |
| Answer» E. | |
| 188. |
Which of the following are the rules of programming NC machine tools in APT language? 1. Only capital letters are used 2. A period is placed at the end of each statement 3. Insertion of space does not affect the APT word. Select the correct answer using the codes given below: |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1 and 3 |
| D. | 1 alone |
| Answer» D. 1 alone | |
| 189. |
A shaft carries a weight W at the centre. The CG of the weight is displaced by an amount e from the axis of the rotation. If 'y is the additional displacement of the CG from the axis of rotation due to the centrifugal force, then the ratio of y to e (where \[{{\omega }_{c}}\] is the critical speed of shaft and \[\omega \] is the angular speed of shaft) is given by: |
| A. | \[\frac{1}{{{\left[ \frac{{{\omega }_{c}}}{\omega } \right]}^{2}}+1}\] |
| B. | \[\frac{1}{{{\left[ \frac{{{\omega }_{c}}}{\omega } \right]}^{2}}-1}\] |
| C. | \[{{\left[ \frac{{{\omega }_{c}}}{\omega } \right]}^{2}}+1\] |
| D. | \[\frac{\omega }{{{\left[ \frac{{{\omega }_{c}}}{\omega } \right]}^{2}}-1}\] |
| Answer» C. \[{{\left[ \frac{{{\omega }_{c}}}{\omega } \right]}^{2}}+1\] | |
| 190. |
Match List-I with List-II and select the correct answer using the codes given below the Lists: List-I List-II A. 6 d.o.f. system 1. Vibrating beam B. 1 d.o.f. system 2. Vibration absorber C. 2 d.o.f. system 3. A rigid body in space D. Multi d.o.f. system 4. Pure rolling of a cylinder Codes: |
| A. | A\[\to \]1, B\[\to \]2, C\[\to \]4, D\[\to \]5 |
| B. | A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 |
| C. | A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 |
| D. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| Answer» E. | |
| 191. |
When a vehicle travels on a rough road whose undulations can be assumed to be sinusoidal, the resonant conditions of the base-excited vibrations, are determined by the: |
| A. | Mass of the vehicle, stiffness of the suspension spring, speed of the vehicle, wavelength of the roughness curve |
| B. | Speed of the vehicle only |
| C. | Speed of the vehicle and the stillness of the suspension spring |
| D. | Amplitude of the undulations |
| Answer» B. Speed of the vehicle only | |
| 192. |
Which one of the following properties remains unchanged for a real gas during Joule-Thomson process? |
| A. | Temperature |
| B. | Enthalpy |
| C. | Entropy |
| D. | Pressure |
| Answer» C. Entropy | |
| 193. |
In respect of a closed system, when an ideal gas undergoes a reversible isothermal process: |
| A. | Heat transfer is zero |
| B. | Change in internal energy is equal to work transfer |
| C. | Work transfer is zero |
| D. | Heat transfer is equal to work transfer. |
| Answer» E. | |
| 194. |
If the principal stresses corresponding to a two-dimensional state of stress are \[{{\sigma }_{1}}\] and \[{{\sigma }_{2}}.\] If \[{{\sigma }_{1}}\] is greater than \[{{\sigma }_{2}}\] and both are tensile, then which one of the following would be the correct criterion for failure by yielding, according to the maximum shear stress criterion? |
| A. | \[({{\sigma }_{1}}+{{\sigma }_{2}})/2=\pm \,{{\sigma }_{yp}}/2\] |
| B. | \[{{\sigma }_{1}}/2=\pm \,{{\sigma }_{yp}}/2\] |
| C. | \[{{\sigma }_{2}}/2=\pm \,{{\sigma }_{yp}}/2\] |
| D. | \[{{\sigma }_{1}}=\pm \,{{\sigma }_{yp}}\] |
| Answer» B. \[{{\sigma }_{1}}/2=\pm \,{{\sigma }_{yp}}/2\] | |
| 195. |
A state of pure shear m a biaxial stress is gives by: |
| A. | \[\left[ \begin{matrix} {{\sigma }_{1}} & {{\sigma }_{1}} \\ 0 & {{\sigma }_{2}} \\ \end{matrix} \right]\] |
| B. | \[\left[ \begin{matrix} {{\sigma }_{1}} & 0 \\ 0 & -{{\sigma }_{2}} \\ \end{matrix} \right]\] |
| C. | \[\left[ \begin{matrix} {{\sigma }_{x}} & {{\tau }_{xy}} \\ 0 & -{{\sigma }_{Y}} \\ \end{matrix} \right]\] |
| D. | none of the above |
| Answer» E. | |
| 196. |
A kinematic pair consists of which of the following: |
| A. | two elements that permit relative motion |
| B. | two elements that are connected to each other |
| C. | two elements that do not permit relative motion |
| D. | None of these |
| Answer» B. two elements that are connected to each other | |
| 197. |
The product is assembled from parts A and B. The probability of defective parts A and B are 0.1 and 0.2 respectively. Then the probability of the assembly of A and B to be non-defective is: |
| A. | 0.7 |
| B. | 0.72 |
| C. | 0.8 |
| D. | 0.85 |
| Answer» C. 0.8 | |
| 198. |
In Kando system of track electrification |
| A. | single phase a. c. is converted into d. c. |
| B. | single phase a. c. is converted into 3-phase a.c. |
| C. | 3 phase a. c. is converted into d.c. |
| D. | 3 phase a. c. is converted into single phase a. c. |
| Answer» C. 3 phase a. c. is converted into d.c. | |
| 199. |
The term "effort of governor" refers to |
| A. | centrifugal force of balls |
| B. | useful power developed |
| C. | force acting on sleeve for given % change of speed |
| D. | minimum force required on sleeve for % change of speed |
| Answer» D. minimum force required on sleeve for % change of speed | |
| 200. |
In a \[6\times 6\] transportation problem, degeneracy would arise, it the number of filled slots were: |
| A. | Equal to thirty six |
| B. | More than twelve |
| C. | 2 and 3 twelve |
| D. | less then eleven |
| Answer» E. | |