Basic Electrical Engineering

41. If two perfect sine waves have the same frequency and the same phase, the composite wave

1. Is a sine wave with an amplitude equal to the difference between the amplitude of the waves
2. Is a sine wave with an amplitude equal to the sum of the amplitudes of the two original waves
3. Is not a sine wave, but has the same frequency as the two input waves
4. Has zero amplitude (ie, it does not exist) because the two input waves cancel each other out.

View answer

42. In a 117Vrms utility circuit, the peak-to-peak voltage is approximately

1. 82.7 V
2. 165 V
3. 234 V
4. 331 V

View answer

43. In a 117Vrms utility circuit, the positive peak voltage is approximately

1. 82.7V
2. 165V
3. 234V
4. 331V

View answer

44. In a ac circuit the product of voltage and current is known as

1. Power
2. Real Power
3. Resistive power
4. Apparent power

View answer

45. In a multi-stage RC coupled amplifier the coupling capacitor

1. Limits the low frequency response
2. Limits the high frequency response
3. Does not affect the frequency response
4. Block the DC component without affecting the frequency response

View answer

46. In a perfect sine wave, the peak to peak amplitude is equal to

1. Half the peak amplitude
2. The peak amplitude
3. 1.414 times the peak amplitude
4. Twice the peak amplitude

View answer

47. In a small inductance

1. Energy is stored and released slowly
2. The current flow is always large
3. The current flow is always slow
4. Energy is stored and released quickly

View answer

48. In ac circuit, the ratio of kW/kVA is

1. power factor
2. form factor
3. load factor
4. diversity factor

View answer

49. In an RL circuit, as the ratio of inductive reactance to resistance (XL/R) decreases, the phase angle

1. Increases
2. Decreases
3. Stays the same
4. Becomes alternately positive and negative

View answer

50. In India,electrical power is transmitted by

1. 1-phase ac system
2. 3-wire dc system
3. 3-phase 3-wire ac system
4. 2 wire dc system

View answer