Electrical Circuits

211. What is the complex impedance of a circuit with an absolute resistance of 300 n?

  1. 0 + j 300 Ω
  2. 300 + j 90 Ω
  3. 0 - j 300 Ω
  4. 300 + j 0 Ω

Correct answer: (D)
300 + j 0 Ω

212. What is the conductance of a circuit having three 10 Ω resistors in parallel?

  1. 0.3 S
  2. 3.33 S
  3. 0.33 S
  4. 30 S

Correct answer: (A)
0.3 S

213. What is the cross-sectional are of a conductor whose diameter is 0.001 inch?

  1. One micron
  2. One angstrom
  3. One steradian
  4. One circular mil

Correct answer: (D)
One circular mil

214. What is the efficiency under the conditions of maximum power transfer?

  1. 50 %
  2. 100 %
  3. 25 %
  4. 75 %

Correct answer: (A)
50 %

215. What is the form factor of a triangular wave?

  1. 1.16
  2. 1.11
  3. 1.73
  4. 1.41

Correct answer: (A)
1.16

216. What is the half-power bandwidth of a parallel resonant circuit which has a resonant frequency of 3.6 MHz and Q of 218?

  1. 1.65 kHz
  2. 16.5 MHz
  3. 16.5 kHz
  4. 165 kHz

Correct answer: (C)
16.5 kHz

217. What is the hot resistance of a 100 W, 220 V incandescent lamp?

  1. 2.2 Ω
  2. 22 Ω
  3. 484 Ω
  4. 4.84 Ω

Correct answer: (C)
484 Ω

218. What is the most common non-sinusoidal waveform?

  1. Square wave
  2. Triangular wave
  3. Trapezoidal wave
  4. Sawtooth wave

Correct answer: (A)
Square wave

219. What is the most convenient way of achieving large capacitance?

  1. By using multiplate construction
  2. By using air as dielectric
  3. By decreasing distance between plates
  4. By using dielectric of low permittivity

Correct answer: (A)
By using multiplate construction

220. What is the other name of relative permittivity?

  1. Dielectric strength
  2. Potential gradient
  3. Breakdown voltage
  4. Specific inductance capacity

Correct answer: (D)
Specific inductance capacity

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