Principles of Electronics

In a 5-band coding scheme, what is the color code for a 4.7k resistor with 5% tolerance?

• Yellow, Violet, Black, Black, Silver

• Yellow, Violet, Black, Brown, Gold

• Yellow, Violet, Black, Brown, Silver

• None of the above

The component used in a dc power supply for obtaining a constant dc value at its output is

• pnp transistor

• npn transistor

• Capacitor

• Zener diode

A ceramic capacitor has 104K printed on it. What is its capacitance value?

• 104 micro Farad

• 10* 10^4 pico Farad

• 104 pico Farad

• None of the above

The time period of a square wave with frequency 10kHz is

• 100 ms

• 10 ms

• 100 micro sec

• None of the above

_______ is an electronic component that stores energy in the form of magnetic field.

• Diode

• Capacitor

• Inductor

• Transistor

On the schematic symbol of a PNP transistor,

• 
• 
• 
• 

The lead of an LED corresponding to the flattened edge of its body is ________

• Anode

• Cathode

• Flattened edge has no significance

Which of the below components allow current to flow in one direction and blocks in the opposite direction?

• Diode

• Transistor

• Resistor

• Inductor

How many 120- Ω resistors must be connected in parallel to obtain an equivalent resistance, REQ, of 15 Ω?

• 15

• 8

• 12

• 6

In series connection of resistors, what happens to the current across each resistor?

• Increases

• Remain the same

• Decreases

• Initially increases and then decreases