Question
A heating element using nichrome connected to a 230 V
supply draws an initial current of 3.2 A which settles after a few seconds to a steady value of 2.8 A. What is the steady temperature of the heating element if the room temperature is 27.0 °C ?Temperature coefficient of resistance of nichrome averaged over the temperature range involved is 1.70 × 10-4°C-1.Solution
At room temperature 27°C, the resistance of the heating element. R27° = 230/3.2 = 71.875 ohm At the steady temperature t° C, the resistance Rt = 280/2.8 = 82.143 ohm Now, R2 = R1[1 + α(t2 - t1) => 82.143 = 71.875[1 + 1.7 x 10-4(t - 27)] => 0.0840 x 104 = t - 27 => 840 = t - 27 => t = 867°C
Statement: L ≥ X ≤ Z > Y ≤ A, Y = B ≥ CÂ
Conclusion: I. C >A                         II. A ≥ C
...Statements:
E ≤ A > J ≥ L; Y > J < D
Conclusions:
I. D > L
II. A > L
Statements: Q ≥ R > U; R ≤ S; U ≥ B
Conclusions: I. B < R II. B ≤ Q
Statements: V > I; W = U < I; V < X = Y ≥ Z
Conclusions:
I. Y > U
II. Z ≤ I
III. W < Y
...In the question, assuming the given statements to be true, find which of the following conclusion(s) among the three conclusions is/are true and then ...
Statements: Â P > Q > R > S > T < U < V < W < X
Conclusion:
I. Â P > T
II. Â U < X
...In this question, the statement is followed by two conclusions. Which of the two conclusion(s) is/are true?
Statement: Z < L < P = V ≥ H = U �...
Statement: B = L > N < M; M ≤ V < G
Conclusions:
I. G > N                           Â
II. B = M ...
What is the suitable sign that should be placed so that O > K is true, and J ≤ M is true in the relation 'J = K ≤ L ( ) M < N = O'?
Statements: M > N > P ; P = Q ; N < R
Conclusions:
I. Q < N
II. P < M
III. M > R
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