Mechanical Engineering Principles

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68 MECHANICAL ENGINEERING PRINCIPLES


10 N

1 m

3 m

5 m

B
RA RB

A

20 N

Figure 5.34


  1. The force acting at B (i.e. RB)in
    Figure 5.34 is:


(a) 16 N (b) 20 N
(c) 5 N (d) 14 N


  1. The force acting at A (i.e. RA)in
    Figure 5.34 is:


(a) 16 N (b) 10 N
(c) 15 N (d) 14 N


  1. Which of the following statements is
    false for the beam shown in Figure 5.35
    if the beam is in equilibrium?


6 N
3.0 m 1.0 m3.0 m

R

3 N F

Figure 5.35

(a) The anticlockwise moment is 27 N
(b) The forceF is 9 N
(c) The reaction at the support R is
18 N
(d) The beam cannot be in equilibrium
for the given conditions


  1. With reference to Figure 5.36, the reac-
    tionRAis:


(a) 10 N (b) 30 N
(c) 20 N (d) 40 N

10 N 10 N
0.5 m 0.5 m 0.5 m 0.5 m

RA RB

20 N

Figure 5.36


  1. With reference to Figure 5.36, when
    moments are taken aboutRA,thesum
    of the anticlockwise moments is:
    (a) 25 N m (b) 20 N m
    (c) 35 N m (d) 30 N m

  2. With reference to Figure 5.36, when
    moments are taken about the right-
    hand end, the sum of the clockwise
    moments is:
    (a) 10 N m (b) 20 N m
    (c) 30 N m (d) 40 N m

  3. With reference to Figure 5.36, which of
    the following statements is false?


(a) ( 5 +RB)=25 N m
(b) RA=RB
(c) ( 10 × 0. 5 )=( 10 × 1 )+( 10 × 1. 5 )
+RA
(d) RA+RB=40 N


  1. A beam simply supported at its ends
    is subjected to two intermediate couples
    of 4 kN m clockwise and 4 kN m anti-
    clockwise. The values of the end reac-
    tions are:
    (a) 4 kN (b) 8 kN
    (c) zero (d) unknown

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