Electrical daily capsule 16,17

Capsule 17

Let's test your self

Q1-At resonance frequency of a series RLC circuit

impedance is minimum

impedance is maximum

reactance is maximum

reactance is minimum

Q2-In circuit & network theory the thevenin's equivalent source is a/an

ideal voltage source

ideal current source

current source with an internal resistance

voltage source with an internal resistance

Q3-An electric iron rated at 230v, 500watt, 50Hz. The voltage rating 230v refers to

average value

maximum value

RMS value

amplitude

Q4-Which one of followings is a best conductor of electricity

distilled water

salt water

mineral water

warm water

Q5-Semiconductors resistance decrease with

constant temperature

none of these

increase in temperature

decrease in temperature

Thank you

Capsule 16

Let's test your self

Q1-Why we connects a choke in the tube light

to eliminate corona effects

to avoid radio interface

to improve power factor

to induce high voltage

Q2-An ideal op-amp has ___________ input impedance.

zero

infinite

1000

none of these

Q3-two 2000 ohm,2watt resistor connected in parallel. what is the total resistance and wattage rating

1000ohm,2watt

1000ohm,4watt

2000watt,2watt

2000watt,4watt

Q4-alternators are design to generate AC voltage at

variable frequency

constant power factor

constant frequency

constant current

Q5-Function of interpoles in a dc machine is to

improve commutation

reduce heating

reduce losses

do nothing

Thank you