ELECTRONIC PRACTICE - Practice Mode

1) What is the use of time-base control switch or knob in the CRO?

Select sweep speed Select input voltage range Select input signal voltage Select intensity of the beam

Correct Answer: Select sweep speed

2) Why a snubber circuit is used in the TRIAC motor control circuit?

To avoid false triggering To increase the life of TRIAC To increase the motor torque To maintain the motor speed constant

Correct Answer: To avoid false triggering

3) What is the output DC voltage in half wave rectifier, if the input AC voltage is 24 volt?

24 Volt 12 Volt 9.6 Volt 10.8 Volt

Correct Answer: 10.8 Volt

4) Why most of semi conductor devices are made by silicon compared to germanium?

High barrier voltage High resistance range High thermal conductivity High current carrying capacity

Correct Answer: High barrier voltage

5) What is the output voltage if the centre tap of transformer is open circuited in a full wave rectifier circuit?

Zero voltage Full rated output Half of the rated output One fourth of rated output

Correct Answer: Zero voltage

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