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.
| 1801. |
If a Hexadecimal numbers needs to convert to binary. For each hexadecimal digit, there will be how many bits |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» D. 8 | |
| 1802. |
The bulk resistance of a diode is |
| A. | the resistance of P and N materials |
| B. | the resistance of junction only |
| C. | the resistance of P material only |
| D. | the resistance of N material only |
| Answer» B. the resistance of junction only | |
| 1803. |
The three primary colours are |
| A. | red, orange and blue |
| B. | red, blue and green |
| C. | red, yellow and blue |
| D. | none of the above |
| Answer» B. red, blue and green | |
| 1804. |
When a P?N junction is forward biased |
| A. | the width of the depletion layer is decreased |
| B. | the width of depletion layer is increased |
| C. | the width of the depletion layer remains the same |
| D. | none of these |
| Answer» B. the width of depletion layer is increased | |
| 1805. |
In the toggle mode a JK- flip-flop has |
| A. | J=0, K=0. |
| B. | J=1, K=1. |
| C. | J=0, K=1. |
| D. | J=1, K=0. |
| Answer» C. J=0, K=1. | |
| 1806. |
A digital computer can memorize indefinitely |
| A. | only numerical data |
| B. | only non-numerical data |
| C. | both numerical and non-numerical data |
| D. | neither numerical nor non-numerical data |
| Answer» D. neither numerical nor non-numerical data | |
| 1807. |
Which of me following signals is not transmitted in colour TV? |
| A. | Q |
| B. | I |
| C. | R |
| D. | none of the above |
| Answer» D. none of the above | |
| 1808. |
A transistor is a combination of two p-n junction with their |
| A. | p region connected together |
| B. | n region connected together |
| C. | n region connected to other p region |
| D. | [a] and [b] |
| Answer» E. | |
| 1809. |
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. | |
| 1810. |
In a fall wave rectifier circuit the peak inverse voltage per diode is |
| A. | the same as that in a half wave circuit |
| B. | half the value in a half wave circuit |
| C. | double the value in a half wave circuit |
| D. | none of above |
| Answer» D. none of above | |
| 1811. |
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 | |
| 1812. |
A sequence of binary digits is known as |
| A. | Bit string |
| B. | Byte string |
| C. | Input string |
| D. | Word string |
| Answer» B. Byte string | |
| 1813. |
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 | |
| 1814. |
An antenna is |
| A. | capacitive coupled |
| B. | inductive |
| C. | both [a] and [b] |
| D. | none of these |
| Answer» C. both [a] and [b] | |
| 1815. |
In triode valve, the plate of characteristic plotted with positive and negative grid voltages will have |
| A. | different slopes |
| B. | almost same slopes |
| C. | positive and negative slopes respectively |
| D. | none of the above |
| Answer» C. positive and negative slopes respectively | |
| 1816. |
Zener diodes |
| A. | have breakdown voltage of less than 5V and have ve temperature coefficient |
| B. | have breakdown voltage of less than 5V and have \[a+ve\] temperature coefficient |
| C. | have breakdown voltage of more than 5V and have \[a+ve\] temperature coefficient |
| D. | have breakdown voltage of 5 V and have a temperature coefficient |
| Answer» B. have breakdown voltage of less than 5V and have \[a+ve\] temperature coefficient | |
| 1817. |
A boolean function can be transformed into logical |
| A. | Graph |
| B. | Map |
| C. | Diagram |
| D. | Matrix |
| Answer» D. Matrix | |
| 1818. |
Correction in decimal adder is required because |
| A. | sums are represented wrongly in binary code |
| B. | sums are represented wrongly in BCD code |
| C. | the numbers to be added are not represented in BCD code |
| D. | none of these |
| Answer» C. the numbers to be added are not represented in BCD code | |
| 1819. |
The signal sent by the TV transmitter to ensure correct scanning in the receiver are called |
| A. | chrome |
| B. | sync |
| C. | video |
| D. | none of these |
| Answer» C. video | |
| 1820. |
The method of modulation of sound in TV system in India is |
| A. | amplitude modulation |
| B. | frequency modulation |
| C. | both [a] and [b] |
| D. | none of the above |
| Answer» C. both [a] and [b] | |
| 1821. |
In TV receivers, the electron beam is deflected by |
| A. | electromagnetic technique |
| B. | electrostatic technique |
| C. | both [a] and [b] |
| D. | none of the above |
| Answer» C. both [a] and [b] | |
| 1822. |
What type of electron carriers in n-type semiconductor? |
| A. | Minority |
| B. | Majority |
| C. | Both [a] and [b] |
| D. | None of these |
| Answer» C. Both [a] and [b] | |
| 1823. |
In TV if three is no brightness but sound is normal, the trouble could be in |
| A. | horizontal oscillator |
| B. | vertical oscillator |
| C. | both [a] and [b] |
| D. | none of the above |
| Answer» B. vertical oscillator | |
| 1824. |
Which of the following has the highest mobility? |
| A. | Neutron |
| B. | Electron |
| C. | Positive ions |
| D. | Negative ions |
| Answer» C. Positive ions | |
| 1825. |
Which logic family provides minimum power dissipation |
| A. | TTL |
| B. | CMOS |
| C. | BCL |
| D. | JFET |
| Answer» C. BCL | |
| 1826. |
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 | |
| 1827. |
In a p-n-p transistor |
| A. | the electrons are the minority carriers in the base region |
| B. | the base is made by doping the intrinsic semiconductor with indium |
| C. | the emitter injects holes into the base region |
| D. | the principal current carriers are electrons |
| Answer» D. the principal current carriers are electrons | |
| 1828. |
In Boolean algebra AND is represented by |
| A. | + |
| B. | \[-\] |
| C. | / |
| D. | \[\times \] |
| Answer» E. | |
| 1829. |
Given that \[p\,=\] chain pitch C = Centre distance N, n = number of teeth on large and small sprocket respectively, The length of chain in terms of pitches can be approximated by: |
| A. | \[\frac{2C}{P}\] |
| B. | \[\frac{2C}{P}+(N+n)/2\] |
| C. | \[\frac{2C}{P}+\left[ \frac{N+n}{2\pi } \right]\frac{p}{C}\] |
| D. | \[\frac{2C}{P}+\frac{N+n}{2p}{{\left[ \frac{N-n}{2p} \right]}^{2}}\,\frac{p}{C}\] |
| Answer» E. | |
| 1830. |
An ideal diode |
| A. | should have zero resistance in the forward bias and zero resistance in the reverse bias |
| B. | should have infinite large resistance in the reverse bias |
| C. | should have zero resistance in the forward bias and an infinitely large resistance in the reverse bias |
| D. | none of these |
| Answer» D. none of these | |
| 1831. |
The boolean algebra is mostly based on |
| A. | Boolean theorem |
| B. | De Morgans theorem |
| C. | D Morpans theorem |
| D. | Standard theorem |
| Answer» C. D Morpans theorem | |
| 1832. |
Which of the following are immobile? |
| A. | Electrons |
| B. | Holes |
| C. | Ions |
| D. | None of these |
| Answer» D. None of these | |
| 1833. |
The illumination on screen when there is no broadcast or telecast, is known as |
| A. | raster |
| B. | contrast |
| C. | both [a] and [b] |
| D. | none of the above |
| Answer» B. contrast | |
| 1834. |
Which of the following conducts during fly back? |
| A. | Silicon diode damper |
| B. | Output stage |
| C. | High voltage rectifier |
| D. | None for the above |
| Answer» D. None for the above | |
| 1835. |
D-layer of ionosphere extends approximately from |
| A. | 95 to 150 km |
| B. | 50 to 90 km |
| C. | 110 to 250 km |
| D. | 135 to 270 km |
| Answer» C. 110 to 250 km | |
| 1836. |
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. | |
| 1837. |
The fine tuning control in television receiver is |
| A. | a potentiometer |
| B. | a variable capacitor |
| C. | both [a] and [b] |
| D. | anyone of the above |
| Answer» B. a variable capacitor | |
| 1838. |
A total colour signal consists of |
| A. | one component |
| B. | two components |
| C. | five components |
| D. | three components |
| Answer» C. five components | |
| 1839. |
When an electron breaks a covalent bond and moves away |
| A. | the semiconductor becomes conductor |
| B. | a valency is created in broken covalent bond |
| C. | the conductivity of the material increase |
| D. | more ions are produced |
| Answer» C. the conductivity of the material increase | |
| 1840. |
The semiconductor diode can be used for |
| A. | half wave rectifiers |
| B. | full wave rectifiers |
| C. | both [a] and [b] |
| D. | None of these |
| Answer» D. None of these | |
| 1841. |
The gain factor of a half dipole is |
| A. | 1.641 |
| B. | 1252 |
| C. | 3.25 |
| D. | 7.95 |
| Answer» B. 1252 | |
| 1842. |
The merging of a free electron and a hole is known as |
| A. | recombination |
| B. | extrusion |
| C. | absorption |
| D. | adsorption |
| Answer» B. extrusion | |
| 1843. |
For a PN junction diode, the current in reverse bias may be |
| A. | few micro or nano amperes |
| B. | few amperes |
| C. | between 0.25 and 1A |
| D. | none of these |
| Answer» B. few amperes | |
| 1844. |
Temperature variation is a/an |
| A. | Digital quantity |
| B. | Analog quantity |
| C. | Either Digital or Analog quantity |
| D. | None |
| Answer» C. Either Digital or Analog quantity | |
| 1845. |
A UJT has |
| A. | stable negative resistance characteristics |
| B. | low firing current |
| C. | use as a waveform generator |
| D. | all of these characteristics |
| Answer» B. low firing current | |
| 1846. |
Broadcasting antennas are generally |
| A. | vertical type |
| B. | horizontal type |
| C. | both [a] and [b] |
| D. | none of the above |
| Answer» B. horizontal type | |
| 1847. |
Colour TV camera is essentially a combination of............... basic cameras. |
| A. | five |
| B. | two |
| C. | four |
| D. | three |
| Answer» E. | |
| 1848. |
A digital circuit that can store on bit is a |
| A. | XOR gate |
| B. | flip-flop |
| C. | gate |
| D. | register |
| Answer» C. gate | |
| 1849. |
The maximum charge carried by an ion is |
| A. | equal to the charge of number of electrons gained or lost by the atom on ionization |
| B. | zero |
| C. | equal to the charge of electrons left in the atom |
| D. | none of these |
| Answer» B. zero | |
| 1850. |
Dynamic resistance is the ratio of |
| A. | change in drain-source voltage and change in drain current at constant \[{{V}_{GS}}\] |
| B. | change in gate-source voltage and change in drain current at constant \[{{V}_{DS}}\] |
| C. | Drain-source voltage and drain current |
| D. | gate-source voltage and drain current |
| Answer» B. change in gate-source voltage and change in drain current at constant \[{{V}_{DS}}\] | |