PYQs Based test 16: Electrical & Electronic Measurements

The following measurements are obtained on a single-phase load: V = 220 V ± 1%, I = 5.0 A ± 1% and W = 55 W ± 2%. If the power factor is calculated using these measurements, the worst-case error in the calculated power factor in percent is _________. (Give answer up to once decimal)

When the Wheatstone bridge shown is used to find value of resistance Rₓ, the galvanometer G indicates zero current when R₁ = 50 Ω, R₂ = 65 Ω & R₃ = 100 Ω. if R₃ is known with 5% tolerance on its nominal value of 100 Ω What is the range of Rₓ in ohms.

In an oscilloscope screen, Linear sweep signal is applied at the

Two resistors with nominal resistance values R₁ and R₂ have additive uncertainties ΔR₁ and ΔR₂, respectively. When these resistances are connected in parallel, the standard deviation of the error in the equivalent resistance R is

A non-ideal Si-based pn junction diode is tested by sweeping the bias applied across its terminals from -5 V to +5 V. The effective thermal voltage, V${}_T$, for the diode is measured to be (29 ± 2) mV. The resolution of the voltage source in the measurement range is 1 mV. The percentage uncertainty (rounded off to 2 decimal places) in the measured current at a bias voltage of 0.02 V is______