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.
| 1851. |
Which of the following logics has excellent noise margin? |
| A. | TTL |
| B. | ECL |
| C. | CMOS |
| D. | All of these |
| Answer» D. All of these | |
| 1852. |
Quantities whose values very with time are |
| A. | digital |
| B. | scalar |
| C. | analogue |
| D. | vetor |
| Answer» D. vetor | |
| 1853. |
Complement of XNOR and NOR is ___ and ____ respectively. |
| A. | NOR, XNOR |
| B. | OR, NOR |
| C. | XOR, NOR |
| D. | XOR, OR |
| Answer» E. | |
| 1854. |
In the sum of products function f (X, Y, Z) = E (2,3,4,5), the prime implicates are |
| A. | XY, XY |
| B. | XY, XYZ, XYZ |
| C. | XYZ, XYZ, XY |
| D. | XYZ, XYZ, XYZ, XYZ |
| Answer» B. XY, XYZ, XYZ | |
| 1855. |
Which of the following electron emission process is widely used vacuum tubes? |
| A. | Thermionic emission |
| B. | Secondary emission |
| C. | Photoelectric emission |
| D. | None of these |
| Answer» B. Secondary emission | |
| 1856. |
The p-n junction behaves like a |
| A. | pentode |
| B. | tetrode |
| C. | triode |
| D. | diode |
| Answer» E. | |
| 1857. |
The frictional torque for square thread at mean radius while raising load is given by \[(W=load,\,{{R}_{0}}\,=\,\]Mean Radius,\[\phi =\]Angle of friction, \[\alpha \,=\,\]Helix angle): |
| A. | \[W{{R}_{0}}\tan (\phi -\alpha )\] |
| B. | \[W{{R}_{0}}\tan (\phi +\alpha )\] |
| C. | \[W{{R}_{0}}\tan \alpha \] |
| D. | \[W{{R}_{0}}\tan \phi \] |
| Answer» C. \[W{{R}_{0}}\tan \alpha \] | |
| 1858. |
A latch is _____ sensitive |
| A. | both level and edge |
| B. | edge |
| C. | level |
| D. | None |
| Answer» D. None | |
| 1859. |
What is the function of control unit in the CPU? |
| A. | Decoding of program instructions. |
| B. | Transfer of data to primary storage. |
| C. | Performing logical operations. |
| D. | Storage of program instructions. |
| Answer» B. Transfer of data to primary storage. | |
| 1860. |
A quartz crystal oscillator consists of |
| A. | Only series resonant frequency. |
| B. | Only parallel resonant frequency. |
| C. | Both series and parallel frequencies. |
| D. | Neither series nor parallel frequency. |
| Answer» D. Neither series nor parallel frequency. | |
| 1861. |
The principle of emission of electrons from a metal surface, under the influence of light is known as |
| A. | secondary emission |
| B. | photoelectric emission |
| C. | thermionic emission |
| D. | none of these |
| Answer» C. thermionic emission | |
| 1862. |
When two shafts are neither parallel nor intersecting, power can be transmitted by using: |
| A. | A pair of spur gears |
| B. | A pair of helical gears |
| C. | An Oldham's coupling |
| D. | A pair of spiral gears. |
| Answer» E. | |
| 1863. |
Which of the following results in the movement of a hole? |
| A. | A vacancy is filled by a valence electron from the neighbouring atom |
| B. | Moment of protons |
| C. | Moment of neutrons |
| D. | None of the above |
| Answer» B. Moment of protons | |
| 1864. |
Oxide coated cathodes are used for the tubes |
| A. | used in radio transmitters |
| B. | Power Rectifiers |
| C. | designed to handle small power |
| D. | none of the above |
| Answer» D. none of the above | |
| 1865. |
Which of the following transistors can be used in enhancement mode? |
| A. | UJT |
| B. | JFET |
| C. | MOSFET |
| D. | NPN transistor |
| Answer» D. NPN transistor | |
| 1866. |
Which of the following is multiband high frequency receiving antenna? |
| A. | The folded dipole antenna |
| B. | Log-periodic antenna |
| C. | Square loop antenna |
| D. | None of the above |
| Answer» B. Log-periodic antenna | |
| 1867. |
A screw thread specified by \[M\,\,20\times 25\,\,C\] as per BIS thread system means: |
| A. | Metric thread of 20 mm nominal diameter and 2.5 mm pitch having coarse tolerance |
| B. | Metric thread of 20 mm root diameter and 2-5 mm pitch having coarse tolerance |
| C. | Metric thread of fine class having 20 mm root diameter and 2.5 mm pitch |
| D. | Metric thread of 20 mm shank diameter and 25 mm thread depth with coarse tolerance. |
| Answer» B. Metric thread of 20 mm root diameter and 2-5 mm pitch having coarse tolerance | |
| 1868. |
For vacuum tubes the negative grid voltage of smallest magnitude required to make the plate current zero is called: |
| A. | Cut-off grid voltage |
| B. | Minimum grid voltage |
| C. | Both [a] and [b] |
| D. | None of these |
| Answer» C. Both [a] and [b] | |
| 1869. |
Ball bearings are provided with a cage: |
| A. | To reduce friction |
| B. | To maintain the halls at a fixed distance apart |
| C. | To prevent the lubricant from flowing out |
| D. | To facilitate slipping of balls. |
| Answer» C. To prevent the lubricant from flowing out | |
| 1870. |
In PN junction, the region containing the uncompensated receptor and donor ions is called |
| A. | active region |
| B. | natural region |
| C. | both [a] and [b] |
| D. | depletion region |
| Answer» E. | |
| 1871. |
m binary number system the first digit (bit) from right to left is called as |
| A. | LSB, Least Significant Bit |
| B. | MSB, Most Significant Bit |
| C. | First Bit |
| D. | Last Bit |
| Answer» B. MSB, Most Significant Bit | |
| 1872. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I (Name) List-II (Type) A. Oldham coupling 1. Joins collinear shafts and is rigid type. B. Flange coupling 2. Joins non-collinear shafts and is adjustable. C. Universal coupling 3. Joins collinear shafts and engages and disengages them during motion. D. Friction coupling 4. Compensates peripheral shafts, longitudinal and angular shifts of shafts. Codes: |
| A. | A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3 |
| B. | A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 |
| C. | A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 |
| D. | A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 |
| Answer» B. A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 | |
| 1873. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I (Terminology) List-II (Relevant term) A. Interference 1. Arc of approach, arc of recess, circular pitch. B. Dynamic load on tooth 2. Lewis equation. C. Static load 3. Minimum number of teeth on pinion. D. Contact ratio 4. Inaccuracies in tooth profile Codes: |
| A. | A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| B. | A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 |
| C. | A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 |
| D. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| Answer» E. | |
| 1874. |
EBCDIC is abbreviated as |
| A. | Extended Bit Coded Decimal Interchange Code |
| B. | Extended Binary Coded Dictation Interchange Code |
| C. | Extended Binary Color Decimal Interchange Code |
| D. | Extended Binary Coded Decimal Interchange Code |
| Answer» E. | |
| 1875. |
A composite hollow sphere with steady internal heating is made of 2 layers of materials of equal thickness with thermal conductivities in the ratio of' 1:2 for inner to outer layers. Ratio of inside to outside diameter is 0.8. What is ratio of temperature drop across the inner and outer layers? |
| A. | 0.4 |
| B. | 1.6 |
| C. | 2 in 0.8 |
| D. | 2.5 |
| Answer» E. | |
| 1876. |
Consider the following statements. A splined shaft is used for 1. Transmitting power 2. Holding a flywheel rigidly in position 3. Moving axially the gear wheels mounted on it 4. Mounting V-belt pulleys on it. Of these statements: |
| A. | 2 and 3 are correct |
| B. | 1 and 4 are correct |
| C. | 2 and 4 are correct |
| D. | 1 and 3 are correct |
| Answer» E. | |
| 1877. |
Consider the following statements: The form factor of a spur gear tooth depends upon the 1. Number of teeth 2. Pressure angle. 3. Addendum modification. 4. Circular pitch. Of these statements: |
| A. | 1 and 3 are correct |
| B. | 1 and 4 are correct |
| C. | 1, 2 and 3 are correct |
| D. | 1 and 4 are correct |
| Answer» D. 1 and 4 are correct | |
| 1878. |
To ensure self-locking in a screw jack it is essential that helix angle is: |
| A. | Larger than friction angle |
| B. | Smaller than friction angle |
| C. | Equal to friction angle |
| D. | Such as to give maximum efficiency in lifting |
| Answer» C. Equal to friction angle | |
| 1879. |
A loop antenna is commonly used for |
| A. | direction finding |
| B. | satellite communication |
| C. | radar |
| D. | both [b] and [c] |
| Answer» B. satellite communication | |
| 1880. |
In a multiple V-belt drive, when angle belt is damaged, it is preferable to change the complete set to: |
| A. | Reduce vibration |
| B. | Reduce slip |
| C. | Ensure uniform loading |
| D. | Ensure proper alignment |
| Answer» D. Ensure proper alignment | |
| 1881. |
Which of the following antenna gives circular polarisation? |
| A. | Helical |
| B. | Dipole |
| C. | Both [a] and [b] |
| D. | None of these |
| Answer» B. Dipole | |
| 1882. |
When will be the output of an AND gate is HIGH if there are three inputs, A, B, and C? |
| A. | A=0, B=0, C=0 |
| B. | A=1, B=1, C=0 |
| C. | A=1, B=O, C=1 |
| D. | A=1, B=1, C=1 |
| Answer» E. | |
| 1883. |
The potential barrier acts as a barrier against the flow of |
| A. | electrons only |
| B. | holes only |
| C. | electrons and holes |
| D. | None of these |
| Answer» D. None of these | |
| 1884. |
Wahl stress factor takes into account: |
| A. | Direct shear stress. |
| B. | Torsional shear stress |
| C. | Wire curvature effect |
| D. | Direct shear and wire curvature effect. |
| Answer» E. | |
| 1885. |
In a single reduction, a large velocity ratio is required. The best transmission is: |
| A. | Spur gear drive |
| B. | Helical gear drive |
| C. | Bevel gear drive |
| D. | Worm gear drive |
| Answer» E. | |
| 1886. |
Consider the following design considerations: 1. Tensile failure 2. Creep failure 3. Bearing failure 4. Shearing failure 5. Bending failure The design of the pin of a rocker arm of an I.C. engine is based on: |
| A. | 1, 2 and 4 |
| B. | 1, 3 and 4 |
| C. | 2, 3 and 5 |
| D. | 3, 4 and 5 |
| Answer» E. | |
| 1887. |
A live programme is transmitted from location to TV station through |
| A. | cables |
| B. | wireless |
| C. | antennas |
| D. | none of the above |
| Answer» B. wireless | |
| 1888. |
Intensity of radiation at a surface in perpendicular direction is equal to: |
| A. | Product of emissivity of surface and \[1/\pi .\] |
| B. | Product of emissivity of surface and \[\pi .\] |
| C. | Product of emissive power of surface and \[1/\pi .\] |
| D. | Product of emissive power of surface and \[\pi .\] |
| Answer» D. Product of emissive power of surface and \[\pi .\] | |
| 1889. |
Centrifugal tension in belts is: |
| A. | Useful because it maintains some tension even when no power is transmitted |
| B. | Not harmful because it does not take part in power transmission |
| C. | Harmful because it increases belt tension and reduces the power transmitted |
| D. | A hypothetical phenomenon and does not actually exist in belts |
| Answer» D. A hypothetical phenomenon and does not actually exist in belts | |
| 1890. |
The diameter of tommy bar for a screw jack is designed for: |
| A. | Bending moment due to effort applied |
| B. | Torque on the tommy bar due to effort applied |
| C. | A percentage of axial loads |
| D. | Some axial loads coupled with transverse loads |
| Answer» B. Torque on the tommy bar due to effort applied | |
| 1891. |
In a CE transistor amplifier, if collector?emitter increases, the instantaneous operating point |
| A. | moves up the load line |
| B. | moves down the load line |
| C. | moves at right angles to the load line |
| D. | remains stationary |
| Answer» B. moves down the load line | |
| 1892. |
Which channel has the highest frequency range? |
| A. | Channel? |
| B. | Channel 5 |
| C. | All channels have same frequency range |
| D. | None of the above |
| Answer» D. None of the above | |
| 1893. |
Which of the following is a unipolar diode? |
| A. | Zener diode |
| B. | Step recovery diode |
| C. | Schottky diode |
| D. | All of these |
| Answer» D. All of these | |
| 1894. |
Which bearing is preferred for oscillating conditions? |
| A. | Double row roller hearing |
| B. | Angular contact single row ball bearing |
| C. | Taper roller bearing |
| D. | Needle roller hearing |
| Answer» E. | |
| 1895. |
Which of the following is true about following specifications: Hex Bolt M 16 NL-IS: 1363: |
| A. | 16 eye bolts used on electric motors |
| B. | A stress relieved blot for connecting rod |
| C. | A bolt with a nut |
| D. | A bolt with a nut and a lock nut |
| Answer» E. | |
| 1896. |
The light is converted into video signals corresponding to the red, blue and green components of the............. picture. |
| A. | white |
| B. | black |
| C. | red |
| D. | original colour |
| Answer» E. | |
| 1897. |
The black and white or monochrome portion of the total colour signal is equivalent in all respects to present........... signals. |
| A. | black and white |
| B. | red and blue |
| C. | yellow and green |
| D. | red and yellow |
| Answer» B. red and blue | |
| 1898. |
For aeroplane and navigation preferred frequency band is |
| A. | Very high frequency band |
| B. | Very low frequency band |
| C. | Ultra high frequency band |
| D. | none of the above |
| Answer» D. none of the above | |
| 1899. |
In the case of a vertical belt pulley drive with \[{{T}_{C}}\] as centrifugal tension and \[{{T}_{0}}\] as the initial tension, the belt would tend to hang clear of the lower pulley when: |
| A. | \[{{T}_{c}}\]<\[{{T}_{0}}\] |
| B. | \[{{T}_{c}}\,=\,{{T}_{0}}/3\] |
| C. | \[{{T}_{c}}\]>\[{{T}_{0}}\] |
| D. | \[{{T}_{c}}\,=\,{{T}_{0}}/2\] |
| Answer» D. \[{{T}_{c}}\,=\,{{T}_{0}}/2\] | |
| 1900. |
In a hydrodynamic journal bearing, there is: |
| A. | A very thin film of lubricant between the journal and the hearing such that there is contact between the journal and the bearing |
| B. | A thick film of lubricant between the journal and the bearing |
| C. | No lubricant between the journal and the bearing |
| D. | A forced lubricant between the journal and the bearing |
| Answer» B. A thick film of lubricant between the journal and the bearing | |