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Mechanical Engineering
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Steam Nozzles and Turbines
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Question
A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be
Options
A. 79 m/s
B. 188 m/s
C. 450 m/s
D. 900 m/s
Correct Answer
450 m/s
More questions
1. The conditioned air supplied to the room must have the capacity to take up
Options
A. room sensible heat load only
B. room latent heat load only
C. both room sensible heat and latent heat loads
D. none of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: both room sensible heat and latent heat loads
2. The alignment circle is marked on the psychrometric chart at
Options
A. 20°C
DBT
and 50%
RH
B. 26°C
DBT
and 50%
RH
C. 20°C
DBT
and 60%
RH
D. 26°C
DBT
and 60%
RH
Show Answer
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Discuss
Correct Answer: 26°C
DBT
and 50%
RH
3. The thermal diffusivity for gases is generally __________ those for liquids.
Options
A. equal to
B. less than
C. greater than
Show Answer
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Discuss
Correct Answer: greater than
4. A stripper-plate machine is used to draw the pattern from the mould.
Options
A. Yes
B. No
Show Answer
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Discuss
Correct Answer: Yes
5. Steam turbines are used for
Options
A. large marine propulsion
B. electric power generation
C. direct drive of fans, compressors, pumps
D. all of these
Show Answer
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Discuss
Correct Answer: all of these
6. Two shafts '
A
' and '
B
' are made of same material. The shaft '
A
' is of diameter
D
and shaft '
B
' is of diameter
D
/2. The strength of shaft '
B
' is __________ as that of shaft '
A
'
Options
A. one-eighth
B. one-fourth
C. one-half
D. four times
Show Answer
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Discuss
Correct Answer: one-eighth
7. The shear force at apoint on a beam is the algebraic __________ of all the forces on either side of the point.
Options
A. sum
B. difference
Show Answer
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Discuss
Correct Answer: sum
8. Shear modulus is the ratio of
Options
A. linear stress to linear strain
B. linear stress to lateral strain
C. volumetric strain to linear strain
D. shear stress to shear strain
Show Answer
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Discuss
Correct Answer: shear stress to shear strain
9. The presence of hydrogen in steel causes
Options
A. reduced neutron absorption cross-section
B. improved weldability
C. embrittlement
D. corrosion resistance
Show Answer
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Discuss
Correct Answer: embrittlement
10. The brake pedal during ABS operation
Options
A. is pushed upward forcefully
B. pedal stroke becomes longer
C. transmits slight kickback to the driver's foot
D. all of the above
Show Answer
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Discuss
Correct Answer: transmits slight kickback to the driver's foot
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