Professional Electrical Engineering Quiz 5 part 1

A material best suited for manufacturing of fuse wire is

• Aluminum

• Silver

• Lead

• Copper

In the Fleming’s left-hand rule, thumb always represents

• voltage

• current

• direction of force on conductor

• magnetic field

The net reactance in a series RLC circuit is

• Xₗ

• Xc

• Xc + Xₗ

• XL - Xc

Two resistors R₁ and R₂ are connected in parallel. R₁ is twice of R₂. If the current in R₁ is I, what is the current in R₂?

• I

• 2I

• 4I

• 1/2

The ampere-hour capacity of a battery depends on

• the thickness of the plates

• the strength of the electrolytes

• the area of the plates

• the distance between the plates

A Y-Δ connected transformer has a turns ratio of 1. If the primary line current is 5 amperes, what is the secondary line current?

• 5 A

• 15 A

• 8.66 A

• 2.89 A

In a certain country, the energy consumption is expected to double in 10 years. Calculate the growth rate.

• 4%

• 3.96%

• 13.86%

• 6.93%

The condition in Ohm’s law is that

• ratio V/I should be constant

• current should be proportional to voltage

• the temperature should remain constant

• the temperature should vary

Two single-phase transformers with equal ratings and turns ratio are operated in parallel to supply a load of 300 KVA, 0.80 lagging power factor. Transformer A has a resistance of 2.5% and a reactance of 5.5%. Transformer B has a resistance of 2.0% and a reactance of 5.5%. Find the KVA load of each transformer.

• 147.7, 152.2

• 148.7, 151.5

• 149.7, 150.5

• 150.7, 149.5

If an electrical network having one or more than one voltage source is transformed into an equivalent electrical network with a single voltage source (which is a short circuit current of the previous circuit) with parallel internal resistance of the network with all current sources replaced by their internal resistance. The above illustration is called:

• Thevenin’s theorem

• Reciprocity theorem

• Norton’s theorem

• Superposition theorem