This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on “Electrical Networks”.

1. Electrical network made up of resistor and inductor is a ________________

a) Passive network

b) Active network

c) Low pass filter

d) High pass filter

View Answer

Explanation: Resistor and Inductor are passive electrical components, and the network made up of passive components can be termed as a passive network.

2. Resistor is a ________________ element.

a) Zero order

b) First order

c) Second order

d) None of the mentioned

View Answer

Explanation: For a zero order system transfer function will be constant and the resistor can be categorized as zero order system.

R(S) = (V(S))/(I(S)).

3. What is the time constant for a resistor-capacitor network?

a) R

b) C

c) R/C

d) RC

View Answer

Explanation: For an R-C network, the time constant is the product of resistance and capacitance values.

4. Cascading two first-order system doesn’t result in under-damped second order system.

a) True

b) False

View Answer

Explanation: When two first order systems are cascaded, it produces second order critically damped or over damped system only.

5. Which of the following has transfer function G(S) = 1/(1+Sτ)?

a) First order low pass filter

b) First order high pass filter

c) Notch filter

d) None of the mentioned

View Answer

Explanation: Transfer function of a low-pass RC filter can be found as G(S) = 1/(1+SRC). Where time constant τ=RC.

6. In which of the following categories RLC network can be included?

a) Zero-order system

b) First-order system

c) Second-order system

d) Third-order system

View Answer

Explanation: Transfer function of RLC circuit is 1/(s

^{2}LC+sRC+1), in which the highest power of ‘S’ is two and system is second-ordered system.

7. For an RC network with R=1KΩ and C=100µF. What will be the time constant of a system?

a) 0.1

b) 1

c) 10

d) 0.01

View Answer

Explanation: Time constant of an RC network is the product of resistance and capacitance values.

8. What is the Laplace transform of the component inductor?

a) sL

b) L

c) L/s

d) s^{2}L

View Answer

Explanation: Relation between current flowing and voltage developed across an inductor is given by VL = L(dI(t))/dt and converting into Laplace domain and applying initial conditions to zero, we get

V(s) = L I(s).

9. How we can express Laplace transform of component capacitor?

a) Cs

b) C

c) 1/sC

d) 1/C

View Answer

Explanation: Relation for a capacitor is given as 1/C ∫

_{0}

^{τ}i(t)dt, converting it to Laplace domain and applying zero initial conditions we get 1/sC.

10. What is the natural frequency of RLC circuit?

a) LC

b) RLC

c) √LC

d) 1/(√LC)

View Answer

Explanation: Transfer function of RLC circuit is 1/(s

^{2}LC+sRC+1), while general equation of a second order system is1/(s

^{2}+2δω

_{n}s+ω

_{n}

^{2}). From the relation, ω

_{n}

^{2}=1/LC and we obtain natural frequency.

**Sanfoundry Global Education & Learning Series – Instrumentation Transducers.**

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