Dedicated Freight Corridor Corporation of India (DFCCIL)

Dedicated Freight Corridor Corporation of India (DFCCIL

1. Dissolving salt in water is an example of which type of change ? Physical-Answer Nuclear Chemical Biochemical

2. When nuclear change takes place, which is true Energy is destroyed Energy is released-Answer Energy is changed None of these

3. Which type of radiation is unaffected by magnetism ? Alpha Beta Gamma-Answer All of these

4. Which temperature scale is an absolute scale, where the zero point is the lowest possible temperature ? Kelvin-Answer Celsius Fahrenheit Centigrade

5. The relative randomness of molecules in the states of matter is best indicated by Solid > Liquids > Gas-Answer Liquid > Gas > Solid Liquid > Solid > Gas Gas > Liquid > Solid

6. Whether or not two liquids are miscible is determined by Molecular Size : Molecules of similar sizes tend to mix together Density : Liquids of simliar densities usually mix well together Polarity : Polar and nonpolar liquids are not miscible while polar liquids can usually be mixed with each other-Answer All of the above factors directly affect miscibility

7. The Triple Point is The combination of standard temperature, pressure and volume The combination of temperature and pressure at which the solid, liquid and gas phases can coexist at equilibrium The combination of pressure and temperature at which liquid, gas, and plasma phases all exist in equilibrium-Answer The combination of temperature and pressure at which liquids and gases cannot be distinguished from each other

8. If the work done by a force depends only on the initial and final stages and not on the path taken, then this type of force will be Conservative Force-Answer Non-conservative Force Conservative as well as Non-conservative force None of these

9. Working between which pair of following temperatures, the efficiency of a carnot engine will be maximum ?

10 Degrees F and 10 Degress R-Answer 10 Degrees F and 10 Degress C 10 Degrees R and 10 Degress C It will be same in all the above cases 10. Dacron is a Polyester-Answer Polyamide Nylon Resin

11. Which of the following has the highest stable atom ? Bi Al Cl Pb-Answer

12. In Friedel-Crafts reaction, AlCl3 acts as a Lewis Acid-Answer Lewis Base Catalyst Reactant

13. The number of unpaired electrons in [Ni(CO)4] is Zero-Answer One Three Five

14. Iodoethane reacts with sodium to form Pentane Propane Butene Butane-Answer 15. An ideal gas has maximum density at 1 atm, 300 K 2 atm, 150 K-Answer 0.5 atm, 600 K 1 atm, 500 K 16. Which of the following metals is present in brass, bronze and german silver ? Defence Mechanism Hydrolysis of ATP Trifling of Contraction-Answer Generating right electrical potential across cell membrane 17. First ionization potential is ___________ second ionization potential. Less than-Answer More than Equal to None of these 18. n-propyl benzene is best prepared by Friedel-Crafts Reaction Wurtz Reaction Wurtz-Fitting Reaction-Answer Grignard Reaction 19. Chloroform is slowly oxidized by air to Formly Chloride Carbonyl Chloride-Answer Trichloroacetic Acid Formic Acide 20. Electrophoresis is Movement of colloidal particle under the influence of electric field-Answer Movement of colloidal particle under the influence of magnetic field Movement of colloidal particle in zig-zag fashion Scattering of light by colloidal particles 21. Rosenmund's reduction of an acyl chloride gives Alcohol Ester Hydrocarbon Aldehyde-Answer 22. Pyrophosphoric acid is Monobasic Dibasic-Answer Tribasic Basic 23. Which of the following is an example of a mathematical model ? Area of a circle = PI x Radius^2 Volume of a cube = Length^3 Force = Mass x Acceleration All of the above-Answer 24. The specific activity of an enzyme is relatively constant between pH 3-8. If the enzyme activity at pH 7.0 is to be modeled, which of the following would be a reasonable simplifying assumption ? Specific activity is not dependent on temperature Specific activity is not dependent on substrate concentration Specific activity is not dependent on pH-Answer All of the above 25. The bioreactor which is most commonly used in industry is the Batch Fermenter Fed Batch Fermenter-Answer Continous Fermenter Batch Continous Fermenter 26. Which of the following is correct with regards to microbial growth ? Cells are autocatalysts and thus the rate of increase in biomass (dX/dt) keeps changing Many factors affect cell growth The rate of increase in biomass concentration is not constant during a fermentation All of the above are correct-Answer 27. During a batch fermentation, when would the specific growth rate be lowest ? During exponential phase During the lag and stationary phase-Answer When cells are growing at their fastest rate Throughout the fermentation 28. Which of the following describes a limitation of the exponential growth model ? Biomass growth is assumed to be not linked to the availability of nutrients or substrates It does not predict when cell growth will cease It predicts that all types of cells under all conditions will grow exponentially All of the above are correct-Answer 29. In large scale bioreactors, dissolved oxygen levels are often so low that they restrict the rate of cell growth. In this case Dissolved oxygen would be the growth limiting nutrient The nitrogen source would be the growth limiting nutrient The carbon source would be the growth limiting nutrient-Answer Dissolved oxygen levels would not be the growth limiting nutrient 30. Which of the following is not correct ? The Monod model is an empirical correlation The Michaelis Menten model is a mechanistic model The Monod model was derived from a study of the mechanism of microbial growth-Answer The Michaelis Menten model was derived from a study of the mechanism of enzyme action 31. The technique of Nick Translation was developed by Rigby and Paul Berg-Answer Winkler Roderick and Rigby None of them 32. Which technique allows knowing the status in the interphase ? Hybridization Microarray Karyotyping Fluorescence in situ Hybridization-Answer Pedigree Analysis 33. _________ observed that protein sequences undergo variation during evolution according to certain patterns Zuckerkandl Pauling Margaret Dayoff-Answer All of them 34. Which of the following would have the highest oxygen transfer rate characteristics ? A sparged stirred tank bioreactor being stirred at 200 rpm A non-sparged stirred tank bioreactor being stirred at 200 rpm A shake flask being mixed at 200 rpm All of the above would have equivalent oxygen transfer rate characteristics The answer is A sparged stirred tank bioreactor being stirred at 200 rpm 35. Molar heat capacity of water in equilibrium with ice at constant pressure is Zero Infinity 40.45 KJ K^-1 mol^-1 75.48 JK^-1 mol^-1 The answer is Zero 36. Ammonium molybdate test is used to detect the presence of Borate Phosphate Chloride Bromide The answer is Phosphate 37. Increasing the temperature of an aqueous solution will cause Decrease in Molality Decrease in Molarity Decrease in Mole Fraction Decrease in Percentage by Weight The answer is Decrease in Molarity 38. IUPAC name of the compound CH3CH(OH)COOH is Lactic Acid A-Hydroxypropanoic Acid Carboxy Propanol 2-Hydroxypropanoic acid The answer is 2-Hydroxypropanoic acid 39 Which of the following will not displace hydrogen ? Ba Pb Ag Sn The answer is Ag 40. The amount of heat measure for a reaction in a bomb calorimeter is DG DH DE PDV The answer is DE 41. Which of the following oxides is most amphoteric ? Na2O Al2O3 SO3 P2O5 The answer is Al2O3 42. Which among the following is most basic compound ? Benzylamine Aniline Acetanilide P-Nitroaniline The answer is Benzylamine 43. Which of the following elements form interstitial compounds ? Fe Co Ni All of these The answer is All of these 44 The EAN of Co in K3[Co(NH3)6] is 34 35 36 37 The answer is 36 45 The position of electron is identified by quantum numbers n and l. (i) n = 4, l = 1 (ii) n = 4, l = 0 (iii) n = 3, l = 2 (iv) n = 3, l = 1 The order of increasing energy from the lowest to highest is (iv) < (ii) < (iii) < (i) (ii) < (iv) < (i) < (iii) (i) < (iii) < (ii) < (iv) (iii) < (i) < (iv) < (ii) The answer is (iv) < (ii) < (iii) < (i) 46. Gutta Percha is Trans-polyisoproprene A synthetic polymer A very hard material All are correct The answer is All are correct 47. Which one of following does not give acetylene with water ? CaC2 BaC2 SrC2 Al4C3 The answer is Al4C3 48. Normality of 0.3 M phosphoric acid (H3PO3) is 0.3 0.6 0.9 0.1 The answer is 0.6 49. ___________ technique is based on the fact that there are variations in the DNA sequence of restriction sites among different individuals and different species. Polymer Chain Reaction Hybridoma Restriction Fragment Length Polymorphism None of these The answer is Restriction Fragment Length Polymorphism 50 Which enzyme forms phosphodiester bonds between adjacent nucleotides and covalently links two individual fragments of double stranded DNA Alkaline Phosphates DNA Polymerase DNA Liqase Exonuclease The answer is DNA Liqase 51 Name the enzyme used to prevent unwanted self-liquation of vector DNA molecules in cleaning procedures Alkaline Phosphates DNA Ligase DNA Polymerase Helicases The answer is Alkaline Phosphates 52. Many of the vector for use in eukaryotic cells are constructed such that they can exist in both the eukaryotic cell and E.coli. Such vectors are known as Shuttle Passengers Shuttle Vectors Expression Vectors All of these The answer is Shuttle Vectors 53 ___________ are constructed by combining certain features of plasmid and the cos sites of the phage lambda Hybrides Cybrids Cosmids None of these The answer is Cosmids 54 ____________ are used as vector to clone DNA fragments of more than 1 Mb in size Yeast Artificial Chromosomes Bacterial Artificial Chromosomes Plant Chromosomes All of these The answer is Yeast Artificial Chromosomes 55 ___________ vector can accommodate upto 300-350 kb of foreign DNA YAC BAC Plant Animal Answer BAC 56 A collection of clones representing the complete genome of an organism is called Genomic Library DNA Library Inventory None of these Answer-Genomic Library 57. Which method is used to introduce recombinant DNA into host cell ? Electroporation Microinjection Biolistics All of the above-Answer 58. Who invented Polymerase Chain Reaction ? Ely Lilly Kary Mullis Sanger All of these The answer is Kary Mullis 59 Who developed Dideoxynucleotide Chain termination method ? Frederick Sanger and Andrew Coulson Andrew Coulson and Maxam Gilbert All of them The answer is Frederick Sanger and Andrew Coulson 60 Who coined the term genomics ? Winkler Thomas Roderick Craig Venter All of them The answer is Thomas Roderick 61. ___________ primarily involves high-throughput DNA sequencing followed by assembly, organization and management of DNA sequence Structural Genomics Functional Genomics Contigs None of these The answer is Structural Genomics 62. ____________ deals with the reconstruction of the genome to determine the biological function of genes and gene interaction Structural Genomics Functional Genomics Random Libraries Contigs The answer is Functional Genomics 63 _________ of genomic DNA are constructed in small and edium seat plasmid vector along with genomic shotgun large unseat BAC library Random Arrays Mirco Arrays Random Libraries All of these The answer is Random Libraries 64. BLAST means Basic Local Alignment Search Tool Basic Local Array Search Tool Basic Linkage Alignment Search Technique None of them The answer is Basic Local Alignment Search Tool 65. ___________ is a closed culture system, which contains limited amount of nutrients Fed-Batch Culture Continuous Culture Batch Culture All of these The answer is Batch Culture 66.If a batch culture is continuously or sequentially fed with fresh medium without remaining the growing culture, it is called Batch Culture Fed-Batch Culture Continuous Culture Another Culture The answer is Fed-Batch Culture 67 If the temperature of saturated water is increased infinitesimally at constant entropy, the resulting state of water will be (A) Liquid (B) Liquid – vapor coexistence (C) Saturated vapor (D) Solid 68 Water is flowing under laminar conditions in a pipe of length L . If the diameter of the pipe is doubled, for a constant volumetric flow rate, the pressure drop across the pipe (A) decreases 2 times (B) decreases 16 times (C) increases 2 times (D) increases 16 times 70 For uniform laminar flow (in the x -direction) past a flat plate at high Reynolds number, the local boundary layer thickness (? ) varies with the distance along the plate ( x ) as DFCCIL electronics and electrical questions Dedicated Freight Corridor Corporation of India (DFCCIL Dedicated Freight Corridor Corporation of India (DFCCIL) 1. What does LED stand for? Light Emitting Display Low Energy Display Light Emitting Diode-Answer Light Emitting Detector 2. Name the three leads of a common transistor Collector Bias Omitter Base Collector Case Emitter Collector Bias Collector Base Emitter-Answer 3. Connecting a lead from the negative to the positive of a battery will produce: A high resistance circuit A short circuit-Answer A low current path An open circuit 4. What is the approximate characteristic voltage that develops across a red LED? 1.7v-Answer 3.4v 0.6v 5v 5. If two resistors are placed in series, is the final resistance: Higher-Answer Lower he same Cannot be determined 6. Which is not a "common" value of resistance: 2k7 1M8 330R 4k4-Answer 7. If a small value of capacitance is connected in parallel with a large value, the combined capacitance will be: The same Higher-Answer Lower 8. If the voltage on the base of a transistor increases, does it: Turn on Turn off Not enough information-Answer Remain the same 9. The resistor identified in brown is called the: Base Bias Resistor Load Resistor Emitter Feedback Resistor Bypass Resistor-Answer 10. A 100n capacitor in parallel with 10n produces: 90n 100n 110n-Answer Cannot be determined 11. A resistor with colour bands: red-red-red-gold, has the value: 22k 5% 2k2 5%-Answer 220R 5% 22R 5% 12. The lead marked with the arrow is: The Collector The Base The Emitter-Answer The case 13. A 10k resistor in parallel with 10k produces: 10k 5k-Answer 20k Cannot be determined 14. The symbol is: NPN Transistor PNP Transistor-Answer Photo Transistor Field Effect Transistor 15. Two 3v batteries are connected as shown. The output voltage is: 3v 0v-Answer 6v 16. 4 resistors in ascending order are: 22R 270k 2k2 1M 4k7 10k 47R 330k 3R3 4R7 22R 5k6-Answer 100R 10k 1M 3k3 17. The closest value for this combination is: 4k7 2k3-Answer 9k4 18. This stage is called: Common Base Common Collector Common Emitter-Answer Emitter Follower 19. The four symbols are: Capacitor, Microphone, Potentiometer, Electrolytic-Answer Electrolytic, Microphone, Resistor, Capacitor Capacitor, Piezo, Resistor, Electrolytic Electrolytic, Coil, Resistor, Capacitor 20. The value of the combination is: 100n 200n-Answer 50n 21. The resistor marked in red is: Base Bias Resistor-Answer Load Resistor Emitter Feedback Resistor Bypass Resistor 22. A resistor and capacitor in series is called a: Pulse Circuit Timing Circuit/Delay Circuit-Answer Oscillator Circuit/Frequency Circuit Schmitt Circuit 23. A red-red-red-gold resistor in series with an orange-orange-orange-gold resistor produces: 5k5 35,200 ohms-Answer 55k None of the above 24. Name the 4 components: Photo transistor, switch, capacitor, coil Transistor, mercury switch, piezo, coil Photo transistor, reed switch, piezo, coil Photo darlington transistor, reed switch, piezo, coil-Answer 25. To obtain a higher value of resistance, resistors are connected in: Reverse Forward Parallel Series-Answer 26. A capacitor and coil in parallel is called: A Tuned Circuit-Answer A Timing Circuit A Delay Circuit A Schmitt Circuit 27. When the base is raised, the emitter will: Rise-Answer Fall Remain Fixed Oscillate 28. What is 1,000p? 0.01n-Answer 0.0001u 0.1n 1n 29. The current in a circuit is 45mA. This is: 0.045Amp-Answer 0.00045A 0.0045A 0.45A 30. A 100n capacitor can be expressed as: 0.1u u = microfarad-Answer 0.01u 0.001u none of the above 31. 1mA is equal to: 0.001A-Answer 0.00001A 0.01A 0.1A 32. 1,200mV is equal to: 12v 1.2v-Answer 0.12v 0.0012v 33. If a 10k resistor is placed across a 10v supply, the current will be: 10mA 1mA-Answer 0.01mA 0.1mA 34. This arrangement is called: Common Emitter Common Collector/Emitter Follower-Answer Common Base 35. Identify the correctly connected LED: A B-Answer C D 36. Identify the correct statement: The cathode lead is longer. It goes to the negative rail The cathode lead is shorter. It goes to the negative rail-Answer The cathode lead is shorter. It goes to the positive rail The cathode lead is longer. It goes to the positive rail 37. The current requirement of a LED is: 1.7mA 25mA Between 3 and 35mA-Answer 65mA 38. The signal at the collector will be . . . Answer inverted 39. The purpose of the capacitor: To pass AC on the input to the base To allow the transistor to self-bias Block DC from the input line-Answer To allow the stage to operate 40. The direction of conduction for a diode is: answer-A 41. A DC voltage . . . rises and falls is a sinewave remains constant-Answer is an audio waveform 42. A CRO is a Cathode Ray Oscillator Cathode Ray Oscilloscope-Answer Capacitor-Resistor Oscillator Capacitor-Resistor Output 43. These jargon terms mean: (Jargon = language peculiar to a 'mickey' 'electro' 'cap' 'puff'; trade) mighty, electronic, capper, picofarad microfarad, electronic, capacitor, picofarad microfarad, electrolytic, capacitor, picofarad-Answer microfarad, electrolyte, capping, blow 44. The tolerance bands: gold; silver; brown, represent: 10%, 5%, 1% 5%, 10%, 2% 5%, 10%, 1%-Answer 10%, 5%, 2% 45. 223 on a capacitor represents: 0.022u u = microfarad-Answer 22n n = nanofarad 22,000p p = picofarad All of the above 46. Arrange these in ascending order: n, p, u p, u, n, n, u, p p, n, u-Answer 47. Name this symbol: A buffer A NOR gate A NAND gate A Schmitt Trigger-Answer 48. The number "104" on a capacitor indicates: 0.1u 100n-Answer 1n 10n 49. What is the multimeter detecting: The output voltage of the Schmitt Trigger The delay across the capacitor The voltage across the capacitor-Answer The current through the capacitor 50. For the XOR gate, what is the output when both inputs are HIGH: HIGH LOW-Answer Can be HIGH or LOW Cannot be determined DFCCIL electronics and electrical questions Dedicated Freight Corridor Corporation of India (DFCCIL) mechanical engg questions with answers 1. For the purpose of comparison, the steam generating capacity of a boiler is generally expressed in terms of equivalent evaporation-Answer kg/hr steam pressure thermal efficiency 2. One of the following methods is adopted for governing of steam turbines in a power plant hit and miss governing blow off in boiler throttle governing-Answer speed control 3. An aircraft gas turbine operates on Sterling cycle Bryton cycle-Answer Rankine cycle Otto cycle 4. The output of a gas turbine is 300 KW and its efficiency is 20 percent, the heat supplied is 150 KW 6000 KW 600 KW 15 KW-Answer 5. Which of the following is not used as a refrigerant ? carbon monoxide-Answer amonia sulphur dioxide carbon dioxide 6. A refigerant used in the domestic refrigerator is Sulphur dioxide air methane freon-Answer 7. In Industry of the developed nations the type of production most often occurring is Mass production Batch production-Answer Single lot production Create lot production 8. Quick return motion is used in a lathe drilling shaper-Answer grinder 9. Draft on a pattern is provided for facilitating pattern making easy lifting of the casting facilitating withdrawal of the pattern from the mould providing for strinkage of the casting-Answer 10. Which of the following operations cannot be performed on a lathe facing drilling thread cutting slotting-Answer 11. The pump with a low initial cost and low maintenance cost is gear pump bucket pump double acting piston pump centrifugal pump-Answer 12. Mandrels are used to hold cutting tools hollow work pieces-Answer face plate drill bits 13. The operation of enlarging of a hole is called drilling reaming boring-Answer counter sinking 14. In upcut milling the work piece is fed at angle of 60 deg to the cutter against the rotating cutter-Answer at the right angle to the cutter in the direction of the cutter 15. Sprue is the passing provided for the outflow smooth flow inflow-Answer solidification of the molten material 16. Feed in a lathe is expressed in mm per revolution-Answer mm per degree mm rpm 17. Rapping allowance is provided on a pattern to take care of shrinkage distortion machining easy withdrawl-Answer 18. Upsetting is the term used in one of the following operations casting turning drilling forging-Answer 19. Reducing flame is obtained in oxyactetylane welding with excess oxygen equal parts of both gases excess of acetylene-Answer reduced acetylene 20. Brasses and bronzes are welded using neutral flame-Answer oxidizing flames carburising flame reducing flame 21. One of the materials used for making surface plate is granite-Answer brass stainless steel wood 22. In a process chart the inverted triangle symbol indicates an operation inspection storage-Answer transport 23. One of the following function is not performed by coating on the welding electrodes increase the cooling rate-Answer provide protective atmosphere refuce oxidation stabilize the arc 24. Feeler gauges are used for measuring the thickness of plates clearances between mating parts-Answer pitch of screw threads radius of curvature 25. A micrometer screw has pitch of 0.5 mm and the themble has 100 equal divisions marked on it, the least count of the instrument in mm is 0.05 0.5 0.025 0.005-Answer 26. One of the following objectives is not achieved by the process of annealing to relieve internal stress to refine grain structure to increase the yield point-Answer to soften the metal 27. In oxacetylane welding, acetylene is produced using Ca (OH)2 and CO2 Ca C2 and H2O-Answer CaCO3 and H2O CH4 and H2SO4 28. A product layout is generally suggested for continuous type of production-Answer jobbing work batch production efficient machine utilisation 29. The objective of time study is to determine the time taken by a new worker a trainee a very good worker efficient machine utilization-Answer 30. The break even point is that volume of production where no profit exists-Answer maximum profits are obtained fixed costs are less minimum losses occur 31. The melting point of the filler material in brazing should be above 420 deg C-Answer 600 deg C 800 deg C 1000 deg C DFCCIL chemical eng