SOM TESTS 12 TO 13

 TEST 12

(SOM)

THIN OR THICK CYLINDERS AND SPHERES

1. A thin walled cylindrical pressure vessel having a radius of 05m and wall thickness of 25mm is subjected to an internal pressure of 400KPa. The hoop stress developed is

A) 14MPa

B) 1.4MPa

C) 0.14MPa

D) 0.014MPa

Ans A

2. A thin cylindrical vessel of mean diameter D and of length L closed at both the ends is subjected to a water pressure p. the value of hoop stress and longitudinal stress in the shell shall be respectively

A) Pd/2t, Pd/4t

B) Pd/4t, Pd/8t

C) Pd/8t, Pd/8t

D) Pd/t, Pd/t

Ans A

3. A cylindrical tank of radius r and wall thickness t has flat end closures. The tank is subjected to an internal pressure P. the longitudinal and circumferential stresses respectively are given by

A) Pr/t, 0

B) Pr/2t, Pr/t

C) Pr/4t, Pr/3t

D) Pr/6t, Pr/t

Ans B

4. If the thickness of plate is negligible when compared to the diameter of the cylindrical, then it is called

a) Thick cylinder
b) Thin cylinder
c) Hoop cylinder
d) Circumferential cylinder

Ans B

5. In thin cylinders, the thickness should be ____________ times of internal diameter.

a) 1/20
b) 1/15
c) 1/30
d) 1/40

Ans A

6. Hydraulic radius is denoted by

a) T
b) A
c) R
d) N

Ans C

7. Most economical section is also called as

a) Most active section
b) Most effective section
c) Most efficient section
d) Superior section

Ans C

14. The flow of water is controlled in hydraulic structures by 

a) Sluice gates
b) Check gates
c) Lock gates
d) Drain gates

Ans A

12. A rectangular channel has cross sectional area of 50 m2. If the channel section is to be most economical calculate the depth. Take B = 10m.

a) 10 m
b) 5 m
c) 8 m
d) 12 m

Ans B

TEST 13
(SOM)
MOMENT OF INERTIA

1. Polar moment of inertia in cm^4 of a rectangular section having width b =2cm and depth d=6cm is

A) 40 cm^4

B) 35 cm^4

C) 29 cm^4

D) 45 cm^4

Ans A

2. The first moment of area about the axis of bending for a beam cross section is

A) Moment of inertia

B) Section modulus

C) Shape factor

D) Polar moment of inertia

Ans B

3. The square root of the ratio of moment of inertia of the cross section to its cross sectional area called

A) Second moment of area

B) Slenderness ratio

C) Section modulus

D) Radius of gyration

Ans D

4. The axis about which moment of area is taken is known as ____________

a) Axis of area
b) Axis of moment
c) Axis of reference
d) Axis of rotation

Ans C

5. What will be the the radius of gyration of a circular plate of diameter 10cm?

a) 1.5cm
b) 2.0cm
c) 2.5cm
d) 3cm

Ans C

6. Point, where the total volume of the body is assumed to be concentrated is

a) Center of area
b) Centroid of volume
c) Centroid of mass
d) All of the mentioned

Ans B