Technical Questions:
1) Composition of gunmetal? (88%Cu, 10%Tin, 21%Zn)
2)What is the fuel used in airplanes? (Aviation Turbine Fuel)
3) Specific heat capacity of air?
4)Melting point of Aluminum?(6580C)
5) If a ball is kept at a height of x(m),from that position it is dropped .Does the p.e
is equal to the
K.e if the ball goes inside the earth as same distance where it is relieved?.
6) Viscosity of the lubricant ---------- with increase in temperature?. (decreases)
7)What amount of power required to make the 2-strke petrol engine to 4-stroke
diesel engine?(Twice)
8)Which engine is the most efficient in terms of compression ratio?.
9) For the same compression ratio heat removed in each cycle is efficient in Otto or
diesel cycle?(diesel)
10) Use of draft tube in turbine? a) To increase work o/p of runner b) To increase
turbine output. (to increase the pressure of the outgoing water)
11) Percentage of carbon in tool steel?(1.8%)
12) Introduction of sulphur in mild steel increases or decreases the
Machinability?(it is an impurity)
13) Is Bernoulli’s theorem is applicable for steady or unsteady flow?
14) Axial turbine is of which type? a) High head b) low head.
15) Corrosion is inhibited due to oxidation or reduction?
16) Binary power cycle uses ---------as working fluid?
17) The purpose of runner in casting ---------(To remove excess metal & act as a
reservoir of the molten metal)
18) Shape of a u.d.l.of cantilever beam is?
19)Which has high coefficient of friction ?.disc or band brakes
20) Engine valve seat is cooled at ----- temperature in liquid nitrogen (-180C)
21) Buckling is high in bar which is greater or smaller in length?.
22) Formula for deflection of beam? Ans; PL/AE
23)Which law says that pressure can be transferred from one point to another in an
undiminished form?.
24) Is Vane pump is Positive or non-positive displacement pump?.
25) As the altitude why density of the decreases?.
26) In the reversible adiabatic process entropy is constant or not?
27) In which process the temperature of the system changes but there is no heat
transfer to the
surroundings?(ISOTERMAL PROCESS)
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Some Qs they asked me:
1) what is the gauge pressure inside the room? Ans: zero
2) Bernoulli’s equation? (p/9g+v2/2g+Z=constant)
3)What happens if refrigerator door opens? (rooms cools &becomes air
conditioning)
4) Differentiate between annealing and normalizing?
5) Counter sinking and counter boring?
Some of the aptitude questions are:
1. SQRT (156.25) * SQRT (14.25) = 35 * X what is the value of X? X = 1.25
2. A + 8450 ÷ 650 = 13 + A. What is the value of A? A = 0
3. The sum of a number whose th is 45.What is the number? Ans: None
4. The sum of a 2 digit number is equal to the difference between them. Find how
many
such numbers are possible? Ans: 10
5. The sum of a 2 digit number is equal to twice the difference between them. Find
how
many such numbers are possible?
6. 1000.01 – 100.01 – 10.01 = X. what is X? X = 889.99
7. 0.25% of 10 – 10% of 0.25 = 25% of 100 – 100% of X. What is X? X = 25
8. One – fifth of two – third of a number is equal to 24.What is the number?
9. 100$8 – 2$39 = $319.What is $? $ = None of these
10. Ajith and Ajay’s age are in the ratio of 3:5. Two years hence, their age are in
the ratio
7:11.What is Ajith’s present age? Ajith’s age = 12.
11. The length of a train is 200m and it crosses a platform of 75m in 15sec.
Another train
with a length of 180m which is on the opposite direction approaches it. How long
it will
take to cross the other?
12. (X) – Square, % - Square root, # - Divide, * - Multiply,@ - addition and & -
Subtraction. Find the value of (4)#4%4*4@4
13. Solve 30 – 0.05 *20 +10÷ 5 =?
14. A circle of diameter 28 cm. If there is a rectangle of length 56 cm.What is the
value of
breadth whose areas are equal? Breadth = 44cm
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15. A wheel rotates 18 revolutions in 4.5 sec. What are the revolutions of the wheel
per
minute? Revolutions = 240
16. Solve: 20% of 60%of a number is equal to 40% of 200.What is the number?
17. 252 x 253 =? 252 + 3
18. Series: 5 7.5 15 37.5 112.5 339.75 X
19. Trisha’s monthly salary is 25% more than Krishna’s salary but 25% less than
Payal’s
salary. Krishna’s annual income is Rs. 1, 20, 000. What is the monthly income of
Payal?
20. There is a seven consecutive odd numbers.What is the number greater than 6
and it is
smaller than 6?
Technical Aptitude:
1. Work done is Zero for which process? Ans: Constant Volume
2. Which cycle has high efficiency? Ans: Otto Cycle
3. The power of 2 –stroke engine varies from 4 – stroke engine by______. Ans:
Twice
4. Sudden reduction in barometer leads to ______. Ans: Storm
5. Composition of Stainless steel ____. Ans: Chromium, Nickel…
6. Gears are produced in mass production by ______. Ans: Hobbing
7. Pick out the wrong statements:
a) The good fuel should have high calorific value
b) Ease in storing
c) High ignition point
d) Low smoke and gases Ans: (C)
8. Composition of Gun metal _____. Ans:
9. Gears are commonly called with _______ Ans: Pitch Circle Diameter
10. A good fuel should have ________ ignition point. Ans: Low
11. If heat supplied into the system is 30000 J/S and the power output is 9KW.
What is the
efficiency of system? Ans:
12. A square rod of 2cm x 2cm of which a force of 8800Kg is acting on it.What is
the stress
developed in it? Ans: 2200 Kg/cm2
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13. GNATT chart shows___________(chart that provides the performances of
workers in a gang)
14.Which is the high efficiency freezing agent? Ans: Freon 22
Property of the freezing agent is: Ans: Low boiling point and high melting point
16. A diesel engine, that is, slow speed engine follows which cycle? Ans: Diesel
Cycle
17. Hardness is the property of _________. Ans:
18. A Rotary compressor depends on ___________(rotating the blades and
compressing the air)
19. The potential energy raised upwards ___________ the kinetic energy
downwards. Ans: is
equal to
20. Centipoise is the unit of ________. Ans: Dynamic Viscosity
21. For a thermodynamic system, the COP is 5 and the heat supplied to the system
is 1 KW.
What is the work done?
In an ideal gas compared to a real gas at very high pressure occupies? (less volume)
Kinetic theory of gases assumes that collisions between the molecules are? (elastic
collisions)
The condition of perfect vacuum that is at absolute zero pressure can be attained
at?(0 kelvin)
Specific heat of air?
Which law states that internal energy is function of Temperature? (2nd law of
thermodynamics)
Minimum work done for an adiabatic process the value of n?
Air Refrigerator works on?
1 watt = 1Nm/S
1 h.p =? Kw
When crude oil heated Which Hydro carbon comes first?
What is the purpose of Supercharger?
1Kg of carbon to CO, Amount oxygen required?
Horse power per tones of refrigeration?
Scale formation on the surface of the boiler tubes due to? (Impurities like sulphur,
phosphorus )
Axial shift in steam turbine occurs due to? (expansion of turbine)
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Latent heat of vaporization at low pressure and temperature?
Shaft revolving in a bearing which pair?
Difference between dedendum and addendum? (Addendum- dedendum =
clearance)
The fatigue life of a part can be improved by?
Rotational tendency of force?
Acetylene dissolved in?
The frequency of transverse vibration is 3 Hz then critical speed?
More viscous lub oil?
Example for Non destructive test?
Advantage of V belt?
In gear boxes which type of key is used a structural member subjected to an axial
compressive
force is called?
Pig iron is produced in which furnace? (Blast furnace)
Heat generation of arc welding is due to? (High velocity electron hitting the metal
surface)
In what angle does an object thrown height will travel the longest distance? (450)
Angle of contact between the journal and bearing? (00)
The coupling is required to connect two parallel shaft distance between the shaft is
small and
variable?
Carbon is added to steel to increase its hardness-True/False
Wings of airplane are made by--- (Aluminum)
To protect from thrust which type of follower is used?
With increase in temperature--- Viscosity of liquid--- (decreases)
Heavy machine beds are made of CI for------- (high wear and tear, machinability)
For shock resistance and vibrations we use ----
Rupture strength====?
Washer is used for------- (for lubrication and clearance)
Surface endurance limit depends on (toughness/surface tension/yield
strength/surface finish)
In a uniformly distributed load of 6n/m over a 5 meter length simply supported
beam, the value
of B.M at the point where shear force is zero (17.5/22.5/55/75)
Cam size depends on (base circle/pitch circle/prime circle/none)
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Poisons ratio is higher in (rubber/steel/wood)
In drill tool carbon % is (<0.4 %, 0.8% -1.6%, 1-2.5%)
finishing operation in lathe is done at(low speed/high speed)
degree of freedom in super structure (1/positive/negative/zero)
axial compressors follow the process in ideal conditions
(adiabatic/isotropic/isothermal)
forced draft has negative pressure drop(true or false)
advantage of v-belt?
The key used in the gears for transmitting power(flat/saddle/spline/square)
dye penetration test is (pouring/surface tension/capillary/none)
Poisson ratio?
Endurance limit is depend upon—1.toughness 2.elasticity 3.britleness?
In which furnace, pig iron is made? (Hot Blast furnace)
Corrosion resistant material?
Centipoise is unit of? Dynamic Viscosity
Broaching is made to produce? (enlarging the holes )
Steady rest is used for?
Drill angle?
In parson's turbine, relation between angles?
V-belt angle?
Refrigerant used in refrigerator?
Composition of babbit metal?
Cantilever beam failure of surface finish is represented by?
At what angle in the valve timing, Diesel engine injection occurs?
Name any one non destructive test?
Clutch is located between? (Engine and gear box)
What is the Melting pt of iron? (11000 C)
Name any one Gear material? (mild steel, aluminum)
Drill material composition? (cast iron, high carbon steel)
Which mechanism is used to hold the gear?
Reynolds number range for laminar flow –?
Angle of contact between journal and bearing? (00c)
What is the function of cutting fluid? (to reduce the corrosion, heat, vibrations,
friction)
Dual cycle combination of which two cycles? (const. vol +const. press OR otto+
diesel)
In screw jack --------which thread is used?—
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ACME thread angle?
Frequency of a system is 3 Hz then find the speed in rpm?
For which gear shafts are co-axial?
say true/false:
in simple gear train every shaft is attached with one simple gear only
Radiation heat transfer is varied with T to the power of 4.
GD topics:
Democracy is the only way to sustain economy growth
Should Indian youth involving Politics
Foreign investment should allow directly to India
Foods come first ethics come later
TV channels can be regional , International
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