WorksheetsEMM PYQ
Total questions: 63
Worksheet time: 21mins
Name
Class
Date
1.
Which property describes the state of a system?
a)
Function
b)
State
c)
Property
2.
Which of the following is an intensive property?
a)
Volume
b)
Weight
c)
Temperature
3.
The internal energy of an ideal gas depends only on which variable?
a)
Pressure
b)
Volume
c)
Temperature
4.
The change in internal energy for a gas mixture expanding at constant pressure is given as?
a)
-54 KJ
b)
54 KJ
c)
0 KJ
5.
What does the First Law of Thermodynamics state about heat and work?
a)
They are interchangeable
b)
They are forms of energy transfer
c)
They cannot be interconverted
6.
The Zeroth Law of Thermodynamics is the basis for which measurement?
a)
Pressure
b)
Volume
c)
Temperature
7.
Which instrument operates based on the Zeroth Law of Thermodynamics?
a)
Manometer
b)
Bimetallic thermometer
c)
Barometer
8.
What heat treatment process improves hardness and strength in steels?
a)
Annealing followed by quenching
b)
Normalizing followed by tempering
c)
Hardening followed by tempering
9.
Which type of cast iron is used for machine tool structures due to its properties?
a)
White cast iron
b)
Malleable cast iron
c)
Grey cast iron
10.
What is the purpose of inoculation in a foundry for cast iron?
a)
To remove impurities
b)
To increase hardness
c)
To change graphite distribution
11.
What is the classification of cast iron with a carbon content between 4.3% and 6.67%?
a)
Hypo – Eutectic Cast Iron
b)
Eutectic Cast Iron
c)
Hyper – Eutectic Cast Iron
12.
What are aluminum alloys primarily used for?
a)
Electrical wiring
b)
IC engine parts
c)
Structural steel
13.
Which material is preferred for heat transfer applications due to high thermal conductivity?
a)
Aluminum
b)
Copper
c)
Steel
14.
What is Babbitt metal, a tin-based alloy, commonly used for?
a)
Gears
b)
Bearings
c)
Springs
15.
Invar, an alloy of nickel and iron, is used in which device?
a)
Pressure gauge
b)
Bimetallic thermometer
c)
Spectrometer
16.
What percentage of total plastic usage does polystyrene account for?
a)
0.05
b)
0.1
c)
0.2
17.
What is natural rubber an example of?
a)
Thermoset
b)
Thermoplastic
c)
Elastomer
18.
What are ceramic tools primarily manufactured from?
a)
Silicon carbide
b)
Tungsten carbide
c)
Aluminum oxide
19.
Which of these is a synthetic abrasive grinding wheel material?
a)
Sandstone
b)
Emery
c)
Silicon carbide
20.
Which of these is a noted insulating material?
a)
Copper
b)
Steel
c)
Glass wool
21.
What is the ability of a material to resist fracture due to high impact loads?
a)
Hardness
b)
Toughness
c)
Strength
22.
Which property is a material's resistance to plastic deformation under sustained load?
a)
Malleability
b)
Hardness
c)
Ductility
23.
What is a key property of high-speed steel?
a)
Low tensile strength
b)
Low red hardness
c)
Excellent red hardness
24.
What is the ability of a material to be drawn into wire?
a)
Malleability
b)
Ductility
c)
Toughness
25.
What is the ability of a material to be flattened into thin sheets by hammering or rolling?
a)
Ductility
b)
Malleability
c)
Toughness
26.
Which property is the ability of a material to absorb energy before fracture?
a)
Toughness
b)
Malleability
c)
Resilience
27.
How can toughness be improved in a material?
a)
Quenching
b)
Tempering
c)
Annealing
28.
What is the ability of a body to return to its original shape after a load is removed?
a)
Stiffness
b)
Resilience
c)
Elasticity
29.
What does Hooke's Law state?
a)
Stress is proportional to volume
b)
Stress is proportional to temperature
c)
Stress is proportional to strain
30.
What is the permanent deformation of a material under a sustained load over a long period?
a)
Fatigue
b)
Creep
c)
Hardness
31.
What is the best strengthening process for better creep resistance?
a)
Quenching
b)
Solid solution strengthening
c)
Work hardening
32.
What type of loading is fatigue failure associated with?
a)
Static loading
b)
Cyclic loading
c)
Torsional loading
33.
What is a common defect associated with the rolling process?
a)
Sand wash
b)
Swell
c)
Alligatoring
34.
What is the primary cause of material melting and vaporization in Electron Beam Machining?
a)
Heat from a laser
b)
Kinetic energy of electrons
c)
Chemical reaction
35.
What is the typical ratio of abrasive to liquid carrier in ultrasonic machining?
a)
1:1 to 1:4 by weight
b)
1:10 to 1:20 by weight
c)
5:1 to 10:1 by weight
36.
Why is a grinding wheel flooded with coolant?
a)
To increase friction
b)
To improve aesthetics
c)
To remove heat
37.
What is the purpose of honing?
a)
To create threads
b)
To finish engine cylinder bores
c)
To cut gears
38.
What is the preferred hook angle for steel in broaching operations?
a)
0° to 5°
b)
5° to 10°
c)
15° to 20°
39.
What is the typical helix angle for most drills?
a)
15°
b)
20°
c)
30°
40.
Which welding process is preferred for a higher rate of weld metal deposition?
a)
Gas metal arc welding
b)
Laser-beam welding
c)
Submerged arc welding
41.
For what purpose is tempering performed after hardening?
a)
To decrease hardness
b)
To increase brittleness
c)
To improve toughness
42.
What is the temperature range for tempering surgical instruments?
a)
100°C to 150°C
b)
150°C to 200°C
c)
270°C to 310°C
43.
What is the purpose of annealing steel?
a)
To increase hardness
b)
To increase toughness
c)
To relieve internal stresses
44.
How does normalizing differ from annealing?
a)
It uses a faster cooling rate
b)
It uses a slower cooling rate
c)
It heats to a lower temperature
45.
Which liquid provides the highest rate of cooling for quenching?
a)
Oil
b)
Air
c)
Cold water
46.
What primarily makes up the intake charge in a diesel engine?
a)
Air and fuel
b)
Air alone
c)
Fuel alone
47.
What is the purpose of bearings?
a)
To increase friction
b)
To create wear
c)
To avoid friction and wear
48.
What does the bearing characteristic number (ZN/P) depend on?
a)
Pressure and temperature
b)
Viscosity, speed, and load
c)
Only speed
49.
What is the SI unit for thermal resistance?
a)
J/s
b)
W/mK
c)
°C/W
50.
What instrument is used to measure the velocity of flow at a point?
a)
Venturi meter
b)
Pitot tube
c)
Orifice plate
51.
For proper meshing of a worm and worm wheel, what must be equal?
a)
Axial pitch of worm and circular pitch of wheel
b)
Helix angle of worm and wheel
c)
Pitch diameter of worm and wheel
52.
On a psychrometric chart, what do the curved lines represent?
a)
Dry bulb temperature
b)
Wet bulb temperature
c)
Relative humidity
53.
What is the latent heat of vaporization at the critical point?
a)
Less than zero
b)
Approaches zero
c)
Greater than zero
54.
What is the entropy change across a normal shock?
a)
It remains constant
b)
It decreases
c)
It increases
55.
For evaporators and condensers, how does the LMTD for parallel flow compare to counter flow?
a)
LMTD is equal
b)
LMTD is greater for parallel flow
c)
LMTD is greater for counter flow
56.
How does superheating the refrigerant in a refrigeration cycle affect the COP?
a)
It always increases COP
b)
It always decreases COP
c)
It can increase or decrease COP
57.
What is the difference between temperature and heating value?
a)
They are the same
b)
Temperature is kinetic energy, heating value is combustion energy
c)
Temperature is combustion energy, heating value is kinetic energy
58.
What does viscoelasticity refer to?
a)
Time-dependent strain under stress
b)
A material that is purely elastic
c)
A material that is purely viscous
59.
Why is the statement "Efficiency of a Carnot Cycle is maximum when initial temperature is 0°K" flawed?
a)
Efficiency is independent of temperature
b)
0°K is unattainable
c)
Efficiency is always 100%
60.
Which term refers to localized areas of high stress?
a)
Stress relief
b)
Stress concentration
c)
Stress dissipation
61.
Where does the maximum bending stress in a curved beam occur?
a)
At the center
b)
At the outside fiber
c)
At the inside fiber
62.
Which material is used for deep hole drilling of small diameters (0.2 mm) with EDM?
a)
High speed steel
b)
Stainless steel
c)
Tungsten carbide
63.
What is the desirable effect of superheating steam in a Rankine cycle?
a)
To decrease efficiency
b)
To increase condensation losses
c)
To avoid excessive moisture in turbine stages
100 %
