# Attenuators MCQ’s

This set of Network Theory Multiple Choice Questions & Answers (MCQs) focuses on “Attenuators”.

1. If V1 is the voltage at port 1 and V2 is the voltage at port 2, then the attenuation in dB is?
a) 20 log10 (V1/V2)
b) 10 log10 (V1/V2)
c) 20 log10 (V2/V1)
d) 10 log10 (V2/V1)

2. What is the attenuation in dB assuming I1 is the input current and I2 is the output current leaving the port?
a) 10 log10 (I1/I2)
b) 10 log10 (I2/I1)
c) 20 log10 (I2/I1)
d) 20 log10 (I1/I2)

3. The attenuation in dB in terms of input power (P1) and output power (P2) is?
a) log10 (P1/P2)
b) 10 log10 (P1/P2)
c) log10 (P2/P1)
d) 10 log10 (P2/P1)

4. The value of one decibel is equal to?
a) log10 (N)
b) 10 log10 (N)
c) 20 log10 (N)
d) 40 log10 (N)

5. In the circuit shown below, find the value of I1/I2.

a) (R1-R2+R0)/R2
b) (R1+R2+R0)/R2
c) (R1-R2-R0)/R2
d) (R1+R2-R0)/R2

6. The value of the characteristic impedance R0 in terms of R1 and R2 and R0 in the circuit shown below is?

a) R1+R2(R1+R0)/(R1+R0+R2)
b) R1+ R2(R1+R0)/(R1+R0+R2)
c) R2+ R2(R1+R0)/(R1+R0+R2)
d) R0+R2(R1+R2)/(R1+R0+R2)

7. The value of N in dB is?
a) N = anti log(dB)
b) N = anti log(dB/10)
c) N = anti log(dB/20)
d) N = anti log(dB/40)

8. Determine the value of N in the circuit shown below.

a) (R1+R2-R0)/R2
b) (R1-R2-R0)/R2
c) (R1+R2+R0)/R2
d) (R1-R2+R0)/R2

9. Determine the value of R1 in terms of R0 and N in the circuit shown below is?

a) R1 = R0(N-1)/(N+1)
b) R1 = R0(N+1)/(N+1)
c) R1 = R0(N-1)/(N-1)
d) R1 = R0(N+1)/(N-1)

10. Determine the value of R2 in terms of R0 and N in the circuit shown below is?

a) R2 = NR0/(N2-1)
b) R2 = 2 NR0/(N2-1)
c) R2 = 3 NR0/(N2-1)
d) R2 = 4 NR0/(N2-1)