# Practice Test: Question Set - 01

**1. Welded pressure vessels made of steel plates should be designed according to ‘Code for unfired vessel IS-2825’ when,**

- (A) Internal
pressure is from 1 kgf/cm

^{2}to 200 kgf/cm

^{2}

- (B) Internal
diameter is less than 150 mm

- (C) Water
container is to be designed with capacities less than 500 liters

- (D) Steam
boilers and nuclear pressure vessels are to be designed

**2. In thick cylinders, the axial stress across the thickness of cylinder**

- (A) Remains
uniform throughout

- (B) Varies
from internal pressure at the inner surface to zero at the outer

- (C) Varies
from maximum value at the inner surface to minimum value at the outer surface

- (D) Varies
from maximum value at the outer surface to minimum value at the inner surface

**3. The end-closure for tankers of milk, petrol or diesel is**

- (A) Hemispherical
head

- (B) Conical
head

- (C) Torispherical
head

- (D) Flat head

**4. The thickness of thin cylindrical shell is given by,**

** Where, D _{i,}
P_{i} and σ_{t} are inner diameter, internal pressure and
permissible tensile stress respectively**

- (A)

*P*

_{i}

*D*

_{i}/2

*σ*

_{t}

- (B)

*P*

_{i}

*D*

_{i}/4

*σ*

_{t}

- (C) 2

*P*

_{i}

*D*

_{i}/

*σ*

_{t}

- (D) 4

*P*

_{i}

*D*

_{i}/

*σ*

_{t}

**5. The thickness of thin spherical shell is given by,**

** Where, D _{i,}
P_{i} and σ_{t} are inner diameter, internal pressure and
permissible tensile stress respectively**

- (A)

*P*

_{i}

*D*

_{i}/2

*σ*

_{t}

- (B)

*P*

_{i}

*D*

_{i}/4

*σ*

_{t}

- (C) 2

*P*

_{i}

*D*

_{i}/

*σ*

_{t}

- (D) 4

*P*

_{i}

*D*

_{i}/

*σ*

_{t}

**6. Autofrettage is,**

- (A) A
surface coating process of cylinders for corrosion resistance

- (B) A
heat treatment process for cylinders to relieve residual stresses

- (C) A
process of pre-stressing the cylinder to develop residual compressive stress at
the inner surface

- (D) A
surface hardening process of cylinder to improve wear resistance

**7. The end-closure for tall vertical pressure vessel is**

- (A) Hemispherical
head

- (B) Conical head

- (C) Torispherical
head

- (D) Flat head

**8. In thin cylinders, the tangential stress across the thickness of cylinder**

- (A) Remains
uniform throughout

- (B) Varies
from internal pressure at the inner surface to zero at the outer

- (C) Varies
from maximum value at the inner surface to minimum value at the outer surface

- (D) Varies
from maximum value at the outer surface to minimum value at the inner surface

**9. A cylinder is considered as thin cylinder when the ratio of inner diameter to the wall thickness is,**

- (A) More than 15

- (B) Less than 15

- (C) Equal to 15

- (D) None of
these criteria

**10. The thickness of high-pressure oil and gas pipes is determined by,**

- (A) Lame’s
equation

- (B) Clavarino’s
equation

- (C) Birnie’s
equation

- (D) Barlow’s
equation

**11. A cylinder is considered as thick cylinder when the ratio of inner diameter to the wall thickness is**

- (A) More than 15

- (B) Less than 15

- (C) Equal to 15

- (D) None
of these criteria

**12. The thickness of thick cylindrical shell with open ends and made of ductile material is determined by,**

- (A) Lame’s
equation

- (B) Clavarino’s
equation

- (C) Birnie’s
equation

- (D) Barlow’s
equation

**13. Class 3 pressure vessels are to be designed according to ‘Code for unfired vessel IS-2825’ when,**

- (A) Operating
pressure is less than 17.5 kgf/cm

^{2}

- (B) Operating temperature
is more than 0°C and
less than 250°C

- (C) Thickness of
shell is less than 16 mm

- (D) Any one of
the above

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