COMMUNICATION SYSTEMS QUIZ

Study the following statements. i) The displacement method is more useful when degree of kinematic indeterminacy is greater than the degree of static indeterminacy. ii) The displacement method is more useful when degree of kinematic indeterminacy is less than the degree of static indeterminacy. iii) The force method is more useful when degree of static indeterminacy is greater than the degree of kinematic indeterminacy. iv) The force method is more useful when degree of static indeterminacy is less than the degree of kinematic indeterminacy. The correct answer is

(ii) and (iii)

(i) and (iv)

(ii) and (iv)

(i) and (iii)

TRUE ANSWER : ?
YOUR ANSWER : ?

The deformation of a spring produced by a unit load is called

unit strain

flexibility

influence coefficient

stiffness

TRUE ANSWER : ?
YOUR ANSWER : ?

A pin-jointed plane frame is unstable if (where m is number of members, r is reaction components and j is number of joints)

None of these

(m + r)>2j

m + r = 2j

(m + r)<2j

TRUE ANSWER : ?
YOUR ANSWER : ?

The degree of static indeterminacy of a pin-jointed space frame is given by (where m is number of unknown member forces, r is unknown reaction components and j is number of joints)

m + r – 3j

m + r + 3j

3m + r – 3j

m + r – 2j

TRUE ANSWER : ?
YOUR ANSWER : ?

Degree of kinematic indeterminacy of a pin-jointed plane frame is given by

j – 2r

2j + r

2j – r

3j – r

TRUE ANSWER : ?
YOUR ANSWER : ?

A load W is moving from left to right support on a simply supported beam of span T. The maximum bending moment at 0.4 1 from the left support is

0.16 Wl

0.24 Wl

0.25 Wl

0.20 Wl

TRUE ANSWER : ?
YOUR ANSWER : ?

Bending moment at any section in a conjugate beam gives in the actual beam

curvature

deflection

bending moment

slope

TRUE ANSWER : ?
YOUR ANSWER : ?

For stable structures, one of the important properties of flexibility and stiffness matrices is that the elements on the main diagonal (i) Of a stiffness matrix must be positive (ii) Of a stiffness matrix must be negative (iii) Of a flexibility matrix must be positive (iv) Of a flexibility matrix must be negative The correct answer is

(i) and (iii)

(i) and (iv)

(ii) and (iv)

(ii) and (iii)

TRUE ANSWER : ?
YOUR ANSWER : ?

Muller Breslau’s principle for obtaining influence lines is applicable to i) trusses ii) statically determinate beams and frames iii) statically indeterminate structures, the material of which is elastic and follows Hooke’s law iv) any statically indeterminate structure The correct answer is

(i) and (ii)

(i), (ii) and (iii)

(i), (ii) and (iv)

only (i)

TRUE ANSWER : ?
YOUR ANSWER : ?

The width of the analogous column in the method of column analogy is

2/EI

1/EI

1/2 EI

1/4 EI

TRUE ANSWER : ?
YOUR ANSWER : ?

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