Test questions. 1. For the circuit below if VA=0 VB=0 transistor T0 is____, transistor T1 is_____, LED0 is____.

1.For the circuit below if V_A=0 V_B=0 transistor T₀ is____, transistor T₁ is_____, LED₀ is____.

A. ON, ON, ON B. ON, ON, OFF C. OFF, ON, OFF

D. OFF, OFF, ON E. OFF, OFF, OFF

2.Fill in the gaps in the text: to turn on an NPN transistor, a ______ voltage is applied to the ______. When transistor is turned on, its collector-to-emitter becomes a _____.

A. negative, base, short B. positive, base, short C. negative, emitter, open

D. positive, emitter, short E. positive, emitter, open

3. How many states has the switch got?

A. 1 B. 2 C. 3 D. 4 E. 5

4. Bipolar transistor has:

A. 1 p-n-junction B. 2 p-n-junctions C. 3 p-n-junctions

D.1, or 2, or 3 p-n-junctions E. any number of p-n-junctions

5. The second strip to obtain resistance 120 Ω must be

A. white B. Green C. Brown D. Yellow E. red

6. What statement is wrong?

A. (X+Y)(X+Z)=X+YZ B. X(Y+Z)=XY+XZ C. X+XY=X

D. (XY)´ =(X+Y)´ E. X(X+Y)=X

7. The truth table for XOR gate is:

8. For the circuit below if V_A=0 V_B=5V transistor T₀ is____, transistor T₁ is_____, LED₀ is____.

A. ON, ON, ON B. ON, ON, OFF C. OFF, ON, OFF

D. OFF, OFF, ON E. OFF, OFF, OFF

9. The truth table for NAND gate is:

10. For the circuit below if V_A=5V V_B=0 transistor T₀ is____, transistor T₁ is_____, transistorT₂ is____.