Angle of inclination of the lacing bar with the longitudinal axis of the column should preferably be between

For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than

A

15 mm

B

25 mm

C

30 mm

D

40 mm

Lacing bars in a steel column should be designed to resist

A

Bending moment due to 2.5% of the column load

B

Shear force due to 2.5% of the column load

C

2.5% of the column load

D

Both (A) and (B)

In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.

A

Equal to

B

Twice

C

Three times

D

Four times

If the tendon is placed at an eccentricity e below the centroidal axis of the longitudinal axis of a rectangular beam (sectional modulus Z and stressed load P in tendon) the stress at the extreme top edge

A

Is increased by $$\frac{{{\text{PZ}}}}{{\text{e}}}$$

B

Is increased by $$\frac{{{\text{Pe}}}}{{\text{Z}}}$$

C

Is decreased by $$\frac{{{\text{Pe}}}}{{\text{Z}}}$$

D

Remains unchanged

The moment of inertia of a solid cylinder of mass 'm', radius 'r' and length '$$l$$' about the longitudinal axis or polar axis is

A

$$\frac{{{\text{m}}{{\text{r}}^2}}}{2}$$

B

$$\frac{{{\text{m}}{{\text{r}}^2}}}{4}$$

C

$$\frac{{{\text{m}}{{\text{r}}^2}}}{6}$$

D

$$\frac{{{\text{m}}{{\text{r}}^2}}}{8}$$

The slenderness ratio of lacing bars should not exceed

A

100

B

120

C

145

D

180

When a bar of length '$$l$$' and diameter 'd' is rigidly fixed at the upper end and hanging freely, then the total elongation produced in the bar due to its own weight is (where w = Weight per unit volume of the bar)

A

$$\frac{{{\text{w}}l}}{{2{\text{E}}}}$$

B

$$\frac{{{\text{w}}{l^2}}}{{2{\text{E}}}}$$

C

$$\frac{{{\text{w}}{l^3}}}{{2{\text{E}}}}$$

D

$$\frac{{{\text{w}}{l^4}}}{{2{\text{E}}}}$$

The effective length of lacing is the distance

A

Between the inner end rivets of the bar for single lacing

B

0.7 of the distance between the inner end rivets of the bar for double lacing

C

Between the inner ends of effective lengths of welds connecting the members

D

All the above

For the given values of initial velocity of projection and angle of inclination of the plane, the maximum range for a projectile projected upwards will be obtained, if the angle of projection is

A

$$\alpha = \frac{\pi }{4} - \frac{\beta }{2}$$

B

$$\alpha = \frac{\pi }{2} + \frac{\beta }{2}$$

C

$$\alpha = \frac{\beta }{2} - \frac{\pi }{2}$$

D

$$\alpha = \frac{\pi }{4} - \frac{\beta }{4}$$

E

$$\alpha = \frac{\pi }{2} - \frac{\beta }{2}$$

A body will begin to move down an inclined plane, if the angle of inclination of the plane is ________ the angle of friction.

A

Equal to

B

Less than

C

Greater than

D

None of these

Angle of inclination of the lacing bar with the longitudinal axis of the column should preferably be between

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