Test: Basic Electrical Components - Electronics and Communication Engineering (ECE) MCQ

Resistors R₁ and R₂ in the bridge circuit shown in the given figure are the strain gauge elements of 5kΩ each. Resistors R₃ and R₄ are fixed resistors, with values of 4.3 kW. A digital voltmeter with ranges of 10V, 1V, and 0.1V, and a resolution of 0.1% of FSD, is used to measure the output voltage. What is the minimum change in R₁ that can be detected by the meter? Assume the supply E is 10V.

If the bridge circuit in the given figure is balanced, with R₁ = 15 kΩ, R₂ = 27 kΩ, R₃= 18 kΩ, and C₁ = 220 pF, what are the values of R₄ and C₂?

In the potentiometer circuit shown in the figure, the expression for V_x is

The response of a first-order measurement system to a unit step input is 1 – e– 0.5t, where t is in seconds. A ramp of 0.1 units per second is given as the input to this system. The error in the measured value after transients have died down is

A metal wire has a uniform cross-section A, length, and resistance R between its two endpoints. It is uniformly stretched so that its length becomes l. The new resistance is

A variable air gap type capacitor consists of two parallel plates: a fixed plate and a moving plate at a distance x. If a potential V is applied across the two plates, then the force of attraction between the plates is related to x as

The expression for the capacitance (C in pF) of a parallel plate capacitor is given by:

C = 6.94 × 10^{– 3} (d²/S). The diameter (d) of each plate is 20 mm and the spacing between the plates

(S) is 0.25 mm. The displacement sensitivity of the capacitor is approximate:

Which of the following can be measured using a Wheatstone bridge?

Accuracy in a bridge measurement depends on

In a Wheatstone bridge, which of the following is used as a null detector?

Which of the following statements is correct for impedance?

What is the purpose of Owens Bridge?