quiz4

In AC the current and voltage change their direction with respect to _______.

• current
• time
• voltage
• Refrequency

Motors convert______________ energy into mechanical energy.

• displacement
• pressure
• electrical
• light

Which of the following appliances do not work with AC?

• Washing machine
• Grinding machine
• Water heater
• Laser pointer

AC waveform consists of ______________.

• No cycles
• Negative and positive half cycles
• Negative cycles
• increasing cycles

What type of wave is a sine wave?

• continuous wave.
• discrete
• complex
• clipping wave

Which type of waveform has two step functions (step-up and step-down) for every cycle?

• square
• sawtooth
• rectangular
• pulse

Which waveform remains at one level for one half cycle and remains in second level for second half cycle?

• square
• sawtooth
• rectangular
• pulse

Which type of wave includes one ramp function and one step function of every cycle?

• trapezoidal
• sawtooth
• rectangular
• sawtooth

Which wave form is used in digital switching circuits?

• sine
• suqare
• pulse
• triangular