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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.
| 1901. |
In a p-n junction the potential barrier is due to the charges on either side of the junction. These charges are |
| A. | majority carriers |
| B. | minority carriers |
| C. | both majority as well as minority carriers |
| D. | fixed donor and acceptor ions |
| Answer» E. | |
| 1902. |
A bolt of uniform strength can be developed by: |
| A. | Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt. |
| B. | Keeping the core diameter smaller than the diameter of the unthreaded portion. |
| C. | Keeping the nominal diameter of threads equal the diameter of unthreaded portion of the bolt. |
| D. | One end fixed and the other end free. |
| Answer» B. Keeping the core diameter smaller than the diameter of the unthreaded portion. | |
| 1903. |
A primary colour differs from its complementary by a phase angle of |
| A. | \[180{}^\circ \] |
| B. | \[\frac{\pi }{3}\] |
| C. | \[\frac{\pi }{4}\] |
| D. | \[\frac{\pi }{6}\] |
| Answer» B. \[\frac{\pi }{3}\] | |
| 1904. |
If frequency of modulated wave is less than frequency carrier wave, then input signal is |
| A. | Negative |
| B. | Positive |
| C. | Zero |
| D. | Infinite |
| Answer» B. Positive | |
| 1905. |
The transferred-electron bulk effect occurs in |
| A. | silicon |
| B. | germanium |
| C. | gallium |
| D. | metal semiconductor junction |
| Answer» D. metal semiconductor junction | |
| 1906. |
In p-n junction with no external voltage, the electric field between the acceptor and the donor ions is called a |
| A. | barrier |
| B. | threshold |
| C. | peak |
| D. | path |
| Answer» B. threshold | |
| 1907. |
Match List-I (Type of keys) with List-II (Characteristic) and select the correct answer using the codes given below the Lists: List-I List-II A. Woodruff key 1. Loose fitting, light duty B. Kennedy key 2. Heavy duty C. Feather key 3. Self-aligning D. Flat key 4. Normal industrial use Codes: |
| A. | A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 |
| B. | A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 |
| C. | A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 |
| D. | A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 |
| Answer» E. | |
| 1908. |
The ratio of diffusion constant for electrons \[{{D}_{E}}\] to the mobility for electrons \[{{\mu }_{e}}\] is |
| A. | independent of T |
| B. | inversely proportional to T |
| C. | proportional to \[{{T}^{2}}\] |
| D. | proportional to T |
| Answer» E. | |
| 1909. |
In Boolean algebra A.A is equal to |
| A. | A |
| B. | A2 |
| C. | 2A |
| D. | 1 |
| Answer» B. A2 | |
| 1910. |
Which of the following diode will produce the highest pulsed power output? |
| A. | Varactor |
| B. | Gunn |
| C. | RIMPATT |
| D. | Schottky barrier |
| Answer» D. Schottky barrier | |
| 1911. |
A double fillet welded joint with parallel fillet weld of length L and leg B is subjected to a tensile force P. Assuming uniform stress distribution, the shear stress in distribution, the shear stress the weld is given by: |
| A. | \[\frac{\sqrt{2.}\,P}{BL}\] |
| B. | \[{{\sigma }_{1}}=\frac{P}{2hl}\] |
| C. | \[\frac{P}{\sqrt{2.}B.L}\] |
| D. | \[\frac{2P}{B.L}\] |
| Answer» E. | |
| 1912. |
The function of strobe pulse in digital system is |
| A. | to reset memory registers |
| B. | to check the functioning of a logic gate |
| C. | to avoid race problem |
| D. | to shift data in registers |
| Answer» D. to shift data in registers | |
| 1913. |
In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to: |
| A. | Increase the key length |
| B. | Increase the key depth |
| C. | Increase the key width |
| D. | Decrease the key length |
| Answer» D. Decrease the key length | |
| 1914. |
The following data refers to an open belt drive: Pulley A Pulley B Purpose?. Driving Driving Diameter?. 450 mm 750 mm Angle of contact?. \[{{\theta }_{A}}\,=\,150\] \[{{\theta }_{B}}\,=\,210{}^\circ \] Coefficient of friction between belt and pulley \[{{f}_{A}}\,=\,0.36\] \[{{f}_{B}}\,=\,0.22\] The ratio of tensions may be calculated using the Relation \[({{T}_{1}}/{{T}_{2}})\,=\]exp (z) where z is: |
| A. | \[{{f}_{A}}{{\theta }_{A}}\] |
| B. | \[{{f}_{B}}{{\theta }_{B}}\] |
| C. | \[({{f}_{A}}+{{f}_{B}})\,({{\theta }_{A}}+{{\theta }_{B}})/4\] |
| D. | \[({{f}_{A}}{{\theta }_{A}}+{{f}_{B}}{{\theta }_{B}})/2\] |
| Answer» C. \[({{f}_{A}}+{{f}_{B}})\,({{\theta }_{A}}+{{\theta }_{B}})/4\] | |
| 1915. |
Consider the following statements: 1. Grinding 2. Coating 3. Hammer peening For improving the fatigue strength of steel. Of the above statements: |
| A. | 1 and 2 are correct |
| B. | 2 and 3 are correct |
| C. | 1 and 3 are correct |
| D. | 1, 2 and 3 are correct. |
| Answer» D. 1, 2 and 3 are correct. | |
| 1916. |
A shafts subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m add 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is: |
| A. | 2000-N-m |
| B. | 2050 N-m |
| C. | 2100 N-m |
| D. | 2136 N-m |
| Answer» E. | |
| 1917. |
How the digital signals is transmitted through a single conductor? |
| A. | Parallel |
| B. | Analog |
| C. | Serial |
| D. | None of the above |
| Answer» D. None of the above | |
| 1918. |
The emission of electrons in a vacuum diode is achieved by |
| A. | heating |
| B. | magnetic field |
| C. | electric field |
| D. | none of these |
| Answer» B. magnetic field | |
| 1919. |
When the lubricating oil is forced between the journal and bearing by external pressure, the bearing is known as: |
| A. | Zero film bearing |
| B. | Boundary lubricated bearing |
| C. | Hydrostatic bearing |
| D. | Hydrodynamic bearing |
| Answer» D. Hydrodynamic bearing | |
| 1920. |
Consider the following statements regarding boundary lubrication conditions in hydrodynamic journal hearings: 1. It is an undesirable condition. 2. It always occurs during starting and stopping of the journal. 3. It necessitates frequent repair of the journal. 4. This condition can he completely eliminated by using high viscosity lubricant. Which of the statements given above are correct? |
| A. | 1, 2 and 4 |
| B. | 2, 3 and 4 |
| C. | 1 and 2 |
| D. | 3 and 4 |
| Answer» B. 2, 3 and 4 | |
| 1921. |
In case of semiconductors, recombination is |
| A. | merging of two or more holes |
| B. | merging of an just emerged electron with resulting hole in the semi-conductor |
| C. | both [a] and [b] |
| D. | none of the above |
| Answer» C. both [a] and [b] | |
| 1922. |
Which of these sets of logic gates are designated as universal gates? |
| A. | NOR, NAND. |
| B. | XOR, NOR, NAND. |
| C. | OR, NOT, AND. |
| D. | NOR, NAND, XNOR. |
| Answer» B. XOR, NOR, NAND. | |
| 1923. |
The shearing area of a key of length 'L' breadth 'b' depth 'h' is equal to: |
| A. | \[b\times h\] |
| B. | \[L\times h\] |
| C. | \[L\times b\] |
| D. | \[L\times (h/2)\] |
| Answer» D. \[L\times (h/2)\] | |
| 1924. |
Which of the following stresses are associated with the tightening of nut on a bolt? (1) Tensile stress due to the stretching of bolt (2) Bending stress due to the bending of bolt (3) Crushing and shear stresses in threads (4) Torsional shear stress due to frictional resistance between the nut and the bolt. Select the correct answer using the codes given below: |
| A. | 1, 2 and 4 |
| B. | 1, 2 and 3 |
| C. | 2, 3 and 4 |
| D. | 1, 3 and 4 |
| Answer» E. | |
| 1925. |
In flat belt drive, if the slip between the driver and the belt is 1%, that between belt and follower is 3% and driver and follower pulley diameters are equal, then the velocity ratio of the drive will be: |
| A. | 0.99 |
| B. | 0.98 |
| C. | 0 0.97 |
| D. | 0.96 |
| Answer» E. | |
| 1926. |
A transmission shaft subjected to bending loads must be designed on the basis of: |
| A. | Maximum normal stress theory |
| B. | Maximum shear stress theory |
| C. | Maximum normal stress and maximum shear stress theories |
| D. | Fatigue strength |
| Answer» B. Maximum shear stress theory | |
| 1927. |
Effective stress in wire ropes during normal working is equal to the stress due to: |
| A. | Axial load plus stress due to bending |
| B. | acceleration/retardation of masses plus stress due to bending |
| C. | Axial load plus stress due to acceleration/ retardation |
| D. | bending plus stress due to acceleration/retardation |
| Answer» B. acceleration/retardation of masses plus stress due to bending | |
| 1928. |
The sound signal in video composite signal of TV is |
| A. | FSK |
| B. | AM |
| C. | FM |
| D. | none of the above |
| Answer» D. none of the above | |
| 1929. |
Why decoder is used in the digital electronics? |
| A. | To convert coded information into non coded form |
| B. | To convert non coded information into coded form |
| C. | It is used to separate address bus and data bus |
| D. | None of the above |
| Answer» B. To convert non coded information into coded form | |
| 1930. |
A number of different colours can be formed by the combinations of colours in |
| A. | two colours |
| B. | three colours |
| C. | five colour |
| D. | seven colours |
| Answer» C. five colour | |
| 1931. |
Consider the following statements about anti- friction bearings: 1. They have low starting and low running friction at moderate speeds 2. They have high resistance to shock loading. 3. They can carry both radial and thrust loads. 4. Their initial cost is high. 5. They can accommodated some amount of misalignment of shaft. Of these statements: |
| A. | 1, 2, 3 and 4 |
| B. | 1, 3 and 4 are correct |
| C. | 1, 4 and 5 are correct |
| D. | 1, 2, 3 and 5 are correct |
| Answer» D. 1, 2, 3 and 5 are correct | |
| 1932. |
The lead angle of a worm is \[22.5{}^\circ .\] Its helix angle will be: |
| A. | \[22.5{}^\circ \] |
| B. | \[45{}^\circ \] |
| C. | \[67.5{}^\circ \] |
| D. | \[90{}^\circ \] |
| Answer» D. \[90{}^\circ \] | |
| 1933. |
In a diode the plate current increases when the |
| A. | saturation plate current is reached |
| B. | plate voltage is made more positive |
| C. | plate voltage is made less positive |
| D. | none of these |
| Answer» C. plate voltage is made less positive | |
| 1934. |
Equalizing pulses in TV are sent during |
| A. | vertical blanking |
| B. | horizontal blanking |
| C. | both [a] and [b] |
| D. | none of the above |
| Answer» B. horizontal blanking | |
| 1935. |
If k = 3 for hail bearings and k = 3.33 for roller bearings, which one of the following correctly states the load (P) - Life (L) relationship for rolling contact bearings? |
| A. | \[\frac{{{L}_{1}}}{{{L}_{2}}}\,=\,{{\left( \frac{{{p}_{1}}}{{{p}_{2}}} \right)}^{k}}\] |
| B. | \[\frac{{{L}_{1}}}{{{L}_{2}}}\,=\,{{\left( \frac{{{p}_{1}}}{{{p}_{2}}} \right)}^{\frac{1}{(k-1)}}}\] |
| C. | \[\frac{{{L}_{2}}}{{{L}_{1}}}\,=\,{{\left( \frac{{{p}_{1}}}{{{p}_{2}}} \right)}^{k}}\] |
| D. | \[\frac{{{L}_{2}}}{{{L}_{1}}}\,=\,{{\left( \frac{{{p}_{1}}}{{{p}_{2}}} \right)}^{k-1}}\] |
| Answer» D. \[\frac{{{L}_{2}}}{{{L}_{1}}}\,=\,{{\left( \frac{{{p}_{1}}}{{{p}_{2}}} \right)}^{k-1}}\] | |
| 1936. |
Match List-I (Applications) with List-II (Choice of bearings) and select the correct answer using the codes given below the lists: List-I (Application) List-II (Choice of Bearings) A. Granite table of a coordinate measuring machine 1. Hydrodynamic bearing B. Headstock spindle of a lathe 2. Deep groove ball bearing C. Crank shaft of a lathe 3. hydrostatic bearing diesel engine D. Armature of 0.5 kW induction motor 4. Taper roller bearing Codes: |
| A. | A\[\to \]1, B\[\to \]4, C\[\to \]3, D\[\to \]2 |
| B. | A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 |
| C. | A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 |
| D. | A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| Answer» C. A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 | |
| 1937. |
Consider the following statements: 1. From design considerations, it is always advantageous to place cast iron ribs on the tension side rather than on the compression side. 2. Cast iron is an excellent choice for machine tool guides and frames 3. Cast iron parts have a low notch sensitivity. Which of these statements are correct? |
| A. | 1, 2 and 3 |
| B. | 2 and 3 |
| C. | 1 and 3 |
| D. | 1 and 2 |
| Answer» C. 1 and 3 | |
| 1938. |
Consider the following statements: A nomenclature \[\phi \]50H8/p8 denoted that 1. Hole diameter is 50 mm 2. It is a shaft base system 3. 8 indicates fundamental deviation. Which of the statements given above is/are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 only |
| C. | 1 and 3 only |
| D. | 3 only |
| Answer» D. 3 only | |
| 1939. |
Which one of the following belts should not he used above\[40{}^\circ C\]? |
| A. | Balata belt |
| B. | rubber belt |
| C. | Fabric belt |
| D. | synthetic belt |
| Answer» C. Fabric belt | |
| 1940. |
The permissible stress in a filled weld is 100 N/mm. The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on weldment per cm length of the weld is: |
| A. | 225 kN |
| B. | 15.0 kN |
| C. | 10.6 kN |
| D. | 7.5 kN |
| Answer» D. 7.5 kN | |
| 1941. |
The majority charge carriers in an n-type semiconductors are |
| A. | holes |
| B. | electrons |
| C. | neutrons |
| D. | None of these |
| Answer» C. neutrons | |
| 1942. |
In TV. system |
| A. | picture and sound are frequency modulated |
| B. | picture and sound are amplitude modulated |
| C. | picture is amplitude modulated while sound is frequency modulated |
| D. | none of the above |
| Answer» D. none of the above | |
| 1943. |
If J=K(J and K are shorted) in a JK flip-flop, what circuit is made |
| A. | SR flip-flop |
| B. | Shorted JK flip-flop |
| C. | T flip-flop |
| D. | K flip-flop |
| Answer» D. K flip-flop | |
| 1944. |
Match List-I with List-II and Select the correct answer using the codes given below the Lists: List-I (Filler) List-II (Joining process) A. Cu, Zn, Ag, alloy 1. Braze welding B. Cu, Sn alloy 2. Brazing C. Pb, Sb alloy 3. Soldering D. Iron oxide and aluminium powder 4. TIG welding of aluminium. Codes: |
| A. | A\[\to \]1, B\[\to \]1, C\[\to \]1, D\[\to \]3 |
| B. | A\[\to \]4, B\[\to \]2, C\[\to \]3, D\[\to \]4 |
| C. | A\[\to \]2, B\[\to \]1, C\[\to \]2, D\[\to \]3 |
| D. | A\[\to \]2, B\[\to \]4, C\[\to \]2, D\[\to \]3 |
| Answer» D. A\[\to \]2, B\[\to \]4, C\[\to \]2, D\[\to \]3 | |
| 1945. |
The maximum efficiency of a self-locking screw is: |
| A. | 50% |
| B. | 0.7 |
| C. | 75% |
| D. | 0.8 |
| Answer» B. 0.7 | |
| 1946. |
The output of the vertical amplifier applied to the yoke in a TV receiver, consists of |
| A. | a saw tooth voltage |
| B. | a saw tooth current |
| C. | both [a] and [b] |
| D. | none of the above |
| Answer» C. both [a] and [b] | |
| 1947. |
The night effect is most prominent in |
| A. | vertical antenna |
| B. | ad cock antenna |
| C. | loop antenna |
| D. | both [a] and [b] |
| Answer» D. both [a] and [b] | |
| 1948. |
The edge of a steel plate cut by oxygen cutting will get hardened when the carbon content is: |
| A. | Less than 0.1 percent |
| B. | Less than 0.3 percent |
| C. | More than 0.3 percent |
| D. | Anywhere between 0.1 to 1.0 percent |
| Answer» D. Anywhere between 0.1 to 1.0 percent | |
| 1949. |
A hole is to be punched in a 15 mm thick plate having an ultimate shear strength of 3 N-\[m{{m}^{-2}}.\]If the allowable crushing stress in the punch is \[6\,N\]-\[m{{m}^{-2}},\] the diameter of the smallest hole which can be punched is equal to: |
| A. | 15 mm |
| B. | 30 mm |
| C. | 60 mm |
| D. | 120 mm |
| Answer» C. 60 mm | |
| 1950. |
Match List-I (Nature of Failure) with List-II (Nature of Member) and select the correct answer using the codes given below the lists: List-I (Nature of failure) List-II (Nature of Member) A. Structural member fails in axial compression 1. Knuckle Joint B. A member fail along a \[45{}^\circ \] helical plane subjected to torsion 2. Long column C. A structural member bends and collapses under axial compression load 3. Strut D. A member fails in double shear for a joint 4. Cast iron round bar subjected to torsion Codes: |
| A. | A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 |
| B. | A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1 |
| C. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| D. | A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 |
| Answer» D. A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 | |