RLC Circuits and Motor Controls Quiz

Which component in an RLC circuit stores energy in the form of a magnetic field?

• Resistor

• Capacitor

• Inductor

• Diode

What is the quality factor ( Q ) of a series RLC circuit with ( R = 10 , Ω ), ( L = 0.5 , H ), and ( C = 20 , μF )?

• 1.12

• 2.24

• 3.36

• 4.48

In a parallel RLC circuit, what happens to the impedance at resonance?

• It becomes zero

• It becomes infinite

• It equals the resistance

• It equals the inductive reactance

What is the primary function of a motor starter?

• To increase the motor speed

• To decrease the motor speed

• To protect the motor from overload

• To reverse the motor direction

Which of the following is a common method for starting a three-phase induction motor?

• Direct-on-line (DOL) starter

• Series resistor starter

• Capacitor start

• Shunt start

Which component in a motor starter is responsible for disconnecting the motor in case of an overload?

• Contactor

• Relay

• Circuit breaker

• Fuse

What is the primary function of a thermostat in a heating system?

• To increase the temperature

• To decrease the temperature

• To maintain a set temperature

• To measure the temperature

What is the purpose of a bimetallic strip in a thermostat?

• To measure temperature

• To control current flow

• To act as a switch

• To provide insulation

What is the turns ratio of a transformer with 500 primary turns and 100 secondary turns?

• 5:1

• 1:5

• 10:1

• 1:10

What is the efficiency of a transformer if the input power is 1000 W and the output power is 950 W?

• 90%

• 95%

• 97%

• 99%