Practice Test (See related pages) 1 Alternating voltage continuously varies in amplitude but never reverses polarity. A) True B) False 2 The basic function of an oscilloscope is to view ac waveforms. A) True B) False 3 One complete revolution of a waveform is called an alternation. A) True B) False 4 The numerical value of π is 3.1416. A) True B) False 5 When a sine wave of alternating voltage is connected across a load resistance, the current that flows in the circuit is also a sine wave. A) True B) False 6 When the amplitude of a sine wave is measured with an ac voltmeter, the value displayed by the meter will be the rms value. A) True B) False 7 The rms value of a sine wave is equal to 1.414 times peak value. A) True B) False 8 An oscilloscope can measure or display the peak-to-peak values of an ac waveform. A) True B) False 9 Sound waves above the audible range of frequencies are called audio waves. A) True B) False 10 A quantity that has magnitude and direction is a(n) . 11 Current variations are in phase with the applied voltage in an ac circuit with only. 12 Exact multiples of the fundamental frequency are called frequencies. 13 The maximum value of an ac waveform is called the value. 14 The amount of time it takes for one is called the period. 15 The symbol λ is used to represent . 16 The symbol for a angle is θ. 17 The wave is also referred to as a ramp voltage. 18 When two waveforms are exactly out of phase, what is the difference in degrees? A) 90 B) 180 C) 270 D) 360 19 What type waveform is common in digital electronic circuitry? A) sine B) sawtooth C) cosine D) pulse 20 In a motor, what connects to the electrical source that drives the motor? A) switching contacts B) solenoid C) coil D) armature 21 In an alternator with three generator windings equally spaced around the circle, the windings produce output voltages at A) 120° out of phase with each other B) 180° out of phase with each other C) 90° out of phase with each other D) 270° out of phase with each other 22 Which of the following is not an advantage of three-phase ac voltage? A) more efficient distribution of power B) induction motors are self-starting C) ripple is easier to filter D) less complicated configurations 23 Which of the following test equipment is generally used to view and measure ac waveforms? A) oscilloscope B) voltmeter C) DMM D) frequency counter 24 What symbol is used to represent the ratio of the circumference to the diameter for any circle? A) φ B) ∑ C) ά D) π 25 The numerical value of π is A) 3.1416 B) 4.1316 C) 0.707 D) 1.414
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