A can do a piece of work in 14 days which B can do in 21 days . They begin together and work at it for 7 days . Then , A fell ill and B had to complete fhe work . In how many days the work was completed ?
Answers
Answer:
Read the following and answer any four questions:
The following is the diagram of an electric motor:
a) Which part of the electric motor in the above figure) can be used as an armature after
some modifications?
(1) POXY
(n) YXOP
(I) ABCD
(iv) ABPQ
Page (4)
b) What are these modifications in the part mentioned above?
1) large number of turns
il) s soft iron core
(1) both large number of turns and a soft iron core
(iv) none of these
Which part in the above diagram is replaced by an electromagnet in order to make a
Commercial motor?
(1) X and Y
(ii) Pando
(im) R
(iv) None of these
d Which part in the above diagram is a device that reverses the direction of flow of
current through a circuit?
1) X and Y
(11) P and Q
(117) R
(iv) None of these
Which part in the above diagramis used as an axle in the electric motor?
6) X and Y
(11) P and q
(in) R
(iv) None of these
Answer:
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(α+ɓ)′ร1 ∂αყ ωσɾҡ
=141+211=423+2=425
αƭ ƭɦε εɳ∂, ɓ ωσɾҡร ƒσɾ 3 ∂αყร รσ ωσɾҡ ∂σɳε ɓყ ɓ เɳ 3 ∂αყร=3×211=71.
ɾεɱαเɳเɳɠ ωσɾҡ 1−71=76 ωɦเcɦ เร ƭσ ɓε ∂σɳε ɓყ α αɳ∂ ɓ.
425 σƒ ωσɾҡ (α+ɓ) cαɳ ∂σ เɳ 1∂αყร
∴76 σƒ ωσɾҡ (α+ɓ) cαɳ ∂σ เɳ 5/421×76=751∂αყร
∴ ƭเɱε ƭσ cσɱρℓεƭε ƭɦε ωσɾҡ
=3+751=1051∂αყร..