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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.
| 1951. |
Which one of the following correctly relates the life of a roller bearing in millions of revolutions (L) the load P and the basic dynamic load rating for 1 million revolutions C? |
| A. | \[L={{(C/P)}^{3}}\] |
| B. | \[L={{(C/P)}^{10/3}}\] |
| C. | \[L={{(P/C\,)}^{3}}\] |
| D. | \[L={{(C/P)}^{1/3}}\] |
| Answer» C. \[L={{(P/C\,)}^{3}}\] | |
| 1952. |
Truth table is used to express |
| A. | Boolean expression |
| B. | Boolean map |
| C. | Boolean matrix |
| D. | Boolean addition |
| Answer» B. Boolean map | |
| 1953. |
When compared to a rod of the same diameter and material, a wire rope: |
| A. | Is less flexible |
| B. | Has a much smaller load carrying capacity |
| C. | Does not provide much warning before failure |
| D. | Provides much greater time for remedial action before failure |
| Answer» E. | |
| 1954. |
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. | |
| 1955. |
For d. c. power supply, diode can be used as a detector and a |
| A. | emitter |
| B. | rectifier |
| C. | either [a] and [b] |
| D. | none of these |
| Answer» C. either [a] and [b] | |
| 1956. |
Decrease in strength of signal is known as: |
| A. | tuning |
| B. | modulation |
| C. | attenuation |
| D. | amplification |
| Answer» D. amplification | |
| 1957. |
Electron beam welding can be carried out in: |
| A. | Open air |
| B. | A shielding gas environment |
| C. | A pressurized inert gas chamber |
| D. | Vacuum |
| Answer» E. | |
| 1958. |
Consider the following statements regarding power screws: 1. The efficiency of a self-locking screw cannot be more than 50% 2. If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50% 3. The efficiency of ACME (trapezoidal) thread is less than that of square thread. Of these statements: |
| A. | 1, 2 and 3-are correct |
| B. | 2 and 3 are correct |
| C. | 1 and 3 are correct |
| D. | 1 and 2 are correct |
| Answer» B. 2 and 3 are correct | |
| 1959. |
Convert the binary number (1111000011110000) to hexadecimal number |
| A. | 1010 |
| B. | FOFO |
| C. | 7070 |
| D. | 5050 |
| Answer» C. 7070 | |
| 1960. |
A three-state buffer has the following output states |
| A. | 1, 0, float |
| B. | High, Low, Float |
| C. | Both A and B |
| D. | Set, Reset, Halt |
| Answer» D. Set, Reset, Halt | |
| 1961. |
The correct sequence of the given materials in ascending order of their Weldability is: |
| A. | MS, copper, cast iron, aluminium |
| B. | Cast iron, MS, aluminium copper |
| C. | Copper, cast iron, MS, aluminium |
| D. | Aluminium, copper, cast iron, MS |
| Answer» E. | |
| 1962. |
The most important ionizing agents are |
| A. | ultra violet and\[\alpha \],\[\beta \], and\[\lambda \]radiations from the Sun as well as cosmic rays and meteors |
| B. | infrared radiation being emitted by ground reactions occurring near the surface of earth |
| C. | radiations and emissions by the polluting industries on the earth |
| D. | none of the above |
| Answer» B. infrared radiation being emitted by ground reactions occurring near the surface of earth | |
| 1963. |
One disadvantage of directly coupled transistor amplifier |
| A. | identical transistors are required |
| B. | both NPN transistors are required |
| C. | variations in current due to temperature changes one stage are amplified by other stages |
| D. | the low frequency response is poor |
| Answer» D. the low frequency response is poor | |
| 1964. |
In the multiple disc clutch, if there are 6 discs on the driving shaft and 5 discs on the driven shaft, then the number of pairs of contact surfaces will be equal to: |
| A. | 11 |
| B. | 12 |
| C. | 10 |
| D. | 22 |
| Answer» D. 22 | |
| 1965. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I (Bearing materials) List-II (Properties) A. Babbits 1. Porous B. Bronze 2. Good emeddability C. C.I. 3. Suitable for high Loads and low speeds D. Sintered powdered metal 4 Run well with C.I. journals Codes: |
| A. | A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 |
| B. | A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 |
| C. | A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 |
| D. | A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 |
| Answer» B. A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 | |
| 1966. |
Witch one of the following numbers represents the ratio of kinematic viscosity to the thermal diftusivity? |
| A. | Grashoff number |
| B. | Prandtl number |
| C. | Mach number |
| D. | Nusselt number. |
| Answer» C. Mach number | |
| 1967. |
The process of adding impurities to a semiconductor is known as |
| A. | polling |
| B. | intrusion |
| C. | pugging |
| D. | doping |
| Answer» E. | |
| 1968. |
Tapered roller bearing can take: |
| A. | Radial load only |
| B. | Axial load only |
| C. | Both radial and axial loads and the ratio of these being less than unity |
| D. | Both radial and axial loads and the ratio of these being greater than unity |
| Answer» D. Both radial and axial loads and the ratio of these being greater than unity | |
| 1969. |
When belt drive is transmitting maximum power: |
| A. | Effective tension is equal to centrifugal tension |
| B. | Effective tension is half of centrifugal tension |
| C. | Driving tension on slack side is equal to the centrifugal tension |
| D. | Driving tension on tight side is twice the centrifugal tension |
| Answer» E. | |
| 1970. |
Which of the following semiconductors has the highest melting point? |
| A. | Gallium arsenide |
| B. | Germanium |
| C. | Silicon |
| D. | None of these |
| Answer» D. None of these | |
| 1971. |
Which of the following is non-resonant antenna? |
| A. | The folded dipole |
| B. | The end-fire array |
| C. | The broad side array |
| D. | Both [b] and [c] |
| Answer» C. The broad side array | |
| 1972. |
A helical antenna is used for satellite tracking because of its |
| A. | maneuver ability |
| B. | broad width |
| C. | good FBR |
| D. | none of the above |
| Answer» B. broad width | |
| 1973. |
In the symbol of a \[p-n-p\] or \[n-p-n\] transistor, the lead marked with an arrow is |
| A. | the collector lead |
| B. | the emitter lead |
| C. | the base lead |
| D. | the earthling lead |
| Answer» C. the base lead | |
| 1974. |
In the formulation of Lewis equation for toothed gearing, it is assumed that tangential tooth load \[{{F}_{1}}\]act on the: |
| A. | Pitch point |
| B. | Tip of the tooth |
| C. | Root of the tooth |
| D. | Whole face of the tooth |
| Answer» C. Root of the tooth | |
| 1975. |
In the assembly design of shaft, pulley and key, the weakest members is: |
| A. | Pulley |
| B. | Key |
| C. | Shaft |
| D. | None |
| Answer» C. Shaft | |
| 1976. |
Which one of the following features improves the fatigue strength of a metallic material? |
| A. | Increasing the temperature |
| B. | Scratching the surface |
| C. | Overstressing |
| D. | Under stressing |
| Answer» E. | |
| 1977. |
The voltage-current characteristics of a DC generator for arc welding is a straight line between an open circuit voltage of 80 V and short-circuit current of 300 A. The generator settings for maximum arc power will be: |
| A. | 80 V and 150 A |
| B. | 40 V and 300 A |
| C. | 40 V and 150 V |
| D. | V and 300 A |
| Answer» D. V and 300 A | |
| 1978. |
A+\[\overline{A}\] is equal to |
| A. | A |
| B. | A |
| C. | 0 |
| D. | 1 |
| Answer» E. | |
| 1979. |
The limiting wear load of spur gear is proportional to (where \[{{E}_{p}}\,\,=\] Young's modulus of union material; \[{{E}_{g}}\,\,=\] Young's modulus of gear material: |
| A. | \[{{({{E}_{p}}+{{E}_{g}})}^{-1}}\] |
| B. | \[\left( \frac{{{E}_{p}}+{{E}_{s}}}{{{E}_{p}}{{E}_{s}}} \right)\] |
| C. | \[\left( 1+\frac{{{E}_{p}}}{{{E}_{s}}} \right)\] |
| D. | \[\left( 1+\frac{{{E}_{g}}}{{{E}_{B}}} \right)\] |
| Answer» C. \[\left( 1+\frac{{{E}_{p}}}{{{E}_{s}}} \right)\] | |
| 1980. |
Which one of the following statements is not true of rolling contact bearing? |
| A. | The bearing characteristic number is given by \[\frac{ZN}{p}\] where Z is the absolute viscosity of the lubricant, Nis the shaft speed and p is the bearing pressure. |
| B. | Inner race of a radial ball bearing has an interference fit with the shaft and rotates along with it. |
| C. | Outer race of the hearing has in interference fit with bearing housing and does not rotate. |
| D. | In some cases, the inner race is stationary and outer race rotates. |
| Answer» E. | |
| 1981. |
Match List-I with List-II and select the correct answer using the codes given below the list: List-I (Different types of detachable joints) List-II (Specific use of these detachable joints) A. Cotter joint 1. Tie rod of a wall crane B. Knuckle joint 2. Suspension bridges C. Suspension link joint 3. Diagonal stays in boiler D. Turn buckle (adjustable joint) 4. Cross-head a steam engine Codes: |
| A. | A\[\to \]4, B\[\to \]2, C\[\to \]3, D\[\to \]1 |
| B. | A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 |
| C. | A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 |
| D. | A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3 |
| Answer» C. A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 | |
| 1982. |
Which designing a screw is a screw jack against buckling failure, the end conditions for the screw are taken as: |
| A. | Both the ends fixed |
| B. | Both the ends hinged |
| C. | One end fixed and other end hinged |
| D. | One end fixed and there end free |
| Answer» E. | |
| 1983. |
A spur gear transmitting power is connected to the shaft with a key of rectangular section. The type (s) of stresses developed in the key is/are: |
| A. | Shear stress alone |
| B. | Hearing stress alone |
| C. | Both shear and bearing stresses |
| D. | Shearing, bearing and bending stresses. |
| Answer» D. Shearing, bearing and bending stresses. | |
| 1984. |
Jewel bearings are used in: |
| A. | Contaminated atmosphere |
| B. | low-torque applications |
| C. | Fully immersed in water condition |
| D. | High speed shafts |
| Answer» C. Fully immersed in water condition | |
| 1985. |
Thick steel plate cut with oxygen normally shows signs of cracking. This tendency for cracking can be minimized by: |
| A. | Slow speed cutting |
| B. | Cutting in two or more stages |
| C. | Preheating the plate |
| D. | Using oxy-acetylene flame |
| Answer» B. Cutting in two or more stages | |
| 1986. |
In Digital Logic Designs, GAL is abbreviated as |
| A. | General Advance Logic |
| B. | General Array Logic |
| C. | Generic Advance Logic |
| D. | Generic Array Logic |
| Answer» E. | |
| 1987. |
The maximum forward current in case of low power signal diode is in the range of |
| A. | few milli-amperes |
| B. | 0.1A to 0.5A |
| C. | 1 A to 2.5A |
| D. | 1.25A to 3.25A |
| Answer» B. 0.1A to 0.5A | |
| 1988. |
In a properly biased transistor |
| A. | both depletion regions are large |
| B. | both depletion regions are small |
| C. | the emitter to base depletion region is small collector to base depletion region is large |
| D. | the emitter to base depletion region is large an collector to base depletion region is small |
| Answer» D. the emitter to base depletion region is large an collector to base depletion region is small | |
| 1989. |
In order to achieve maximum heat dissipation, the fin should be designed in such a way that: |
| A. | It should have maximum lateral surface at the root side of the fin |
| B. | It should have maximum lateral surface towards the tip side of the fin |
| C. | It should have maximum lateral surface near the centre of the fin |
| D. | It should have minimum lateral surface near the centre of the fin. |
| Answer» B. It should have maximum lateral surface towards the tip side of the fin | |
| 1990. |
A thin flat Plate \[2\,m\,\times \,2\,m\] is hanging freely in air. The temperature of the surrounding is \[25{}^\circ C.\] Solar radiation is falling on one side of the plate at the rate of 500 \[W/{{m}^{2}}.\] What should be the convective heat Transfer coefficient in \[W/{{m}^{2}}{}^\circ C,\] if the temperature of The plate is to remain constant at \[30{}^\circ C?\] |
| A. | 25 |
| B. | 50 |
| C. | 100 |
| D. | 200 |
| Answer» B. 50 | |
| 1991. |
After expansion from a gas turbine, the hot exhaust gases are used to heat the compressed air from a compressor with the help of a cross flow compact heat exchanger of 0.8 effectiveness. What is the number of transfer units of the heat exchanger? |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» C. 8 | |
| 1992. |
Which of the following method(s) is/are adopted in the design of air duct system 1. Velocity reduction method 2. Equal friction method 3. Static regain method. Select the correct answer using the codes given below: Codes: |
| A. | 1 alone |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 1993. |
To fix the stale point in respect of air-vapour mixtures, three intrinsic properties are needed. Yet, the psychrometric chart requires only two because: |
| A. | Water vapour is in the superheated state |
| B. | The chart is for a given pressure |
| C. | The chart is an approximation to true values |
| D. | The mixtures can be treated as a perfect gas |
| Answer» C. The chart is an approximation to true values | |
| 1994. |
During sensible cooling of air : |
| A. | Its wet bulb temperature increases and dew point remains constant |
| B. | Its wet bulb temperature decreases and the dew point remains constant |
| C. | Its wet bulb temperature increases and the dew point decreases |
| D. | It wet bulb temperature decreases and dew point increases. |
| Answer» C. Its wet bulb temperature increases and the dew point decreases | |
| 1995. |
One ton refrigeration is equivalent to: |
| A. | 3.5 kW |
| B. | 50 kJ/s |
| C. | 1000 J/min |
| D. | 1000 kJ/min |
| Answer» B. 50 kJ/s | |
| 1996. |
The correct sequence of the given components of a vapour compression refrigerator is: |
| A. | Evaporator, compressor, condenser and throttle valve |
| B. | Condenser, throttle valve, evaporator and compressor |
| C. | Compressor, condenser, throttle valve and evaporator |
| D. | Throttle valve, evaporator, compressor and condenser |
| Answer» D. Throttle valve, evaporator, compressor and condenser | |
| 1997. |
The coefficient of performance of a refrigerator working on a reversed Carnot cycle is 4 the ratio of the highest absolute temperature to the lowest absolute temperature is: |
| A. | 1.2 |
| B. | 1.25 |
| C. | 3.33 |
| D. | 4 |
| Answer» C. 3.33 | |
| 1998. |
The danger of breakage and vibration is maximum: |
| A. | Below critical speed |
| B. | near critical speed |
| C. | Above critical speed |
| D. | none of the above |
| Answer» D. none of the above | |
| 1999. |
With symbols having the usual meanings, the single degree of freedom system, \[m\ddot{x}+c\dot{x}+kx=F\sin \,\,\omega t\] represents: |
| A. | Free vibration with damping |
| B. | Free vibration without damping |
| C. | Forced vibration with damping |
| D. | Forced vibration without damping |
| Answer» D. Forced vibration without damping | |
| 2000. |
A simple spring mass vibrating system has a natural frequency of N. If the spring, stiffness is halved and the mass is doubled, then the natural frequency will become: |
| A. | N/2 |
| B. | 2N |
| C. | 4N |
| D. | 8N |
| Answer» B. 2N | |