The primary coil of a transformer has N turns and is connected to a 120 V a.c. power line. If the secondary coils have 1000 turns and a terminal voltage of 1200 volts, what is the value of N?
A. 120 B. 100 C. 1000 D. 1200 Correct Answer: Option B = 100 Explanation For the transformer, V ∝ ∩ => V s ∝ ∩s; Vp ∝ ∩p => Vp/Vs = ∩p/∩s, therefore 120/1200 = ∩p/1000 therefore ∩p * 1200 = 120 * 1000 ∩p = 120*1000/1200 =...The current through a resistor in an A.C circuit is given as 2 sin wt. Determine the D.C. equivalent of the current?
A. A/√2 B. 2/√A C. 2 A D. √2 A Correct Answer: Option B = 2/√A Explanation If I = 2 Sin wt; but in a.c. circuit current I = I0 Sin wt; thus comparing the two equations, it implies that I0 = 2A; Again, the root means square (I(rms)) of an a.c. current is the value of...
Which combination of the above is true of the conduction of electricity through gases?
I. Low pressure. II. High pressure. III. High p.d. IV. Low p.d. A. I and IV only B. I and III only C. II and IV only D. II and III only Correct Answer: Option B – I and III only Explanation Electricity conduction through gases is usually done under low pressure...
A cell can supply current of 0.4 A and 0.2 A through a 4.0Ω and 10.0Ω resistors respectively. This internal resistance of the cell is?
A. 2.0Ω B. 1.0Ω C. 2.5Ω D. 1.5Ω Correct Answer: Option A = 2.0Ω Explanation let the internal resistance of the cell = r, therefore E = I (R+r) (i) E = 0.4(4+r), (ii) E = 0.2 (10+r) therefore 0.4 (4+r)= 0.2 (10+r) 1.6 + 0.4r = 2.0 * 0.2r 0.4r – 0.2r = 2.0 –...Products
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