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Category: Dedicated Freight Corridor Corporation of india

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