QUESTION 1

1. If the resistance of an electric bulb is 500 Ω and voltage across its ends is 250 V then power consumed by it is
2. A.130 W
3. B.125 W
4. C.120 W
5. D.200 W

1 points  

QUESTION 2

1. Which statement best describes the reactance in a series RLC circuit?
2. A.Resistance is always dominant
3. B.The larger of the two reactances is dominant
4. C.Inductive reactance is always dominant
5. D.Capacitive reactance is always dominant

1 points  

QUESTION 3

1. At resonant frequency, what voltage is measured across two series reactive components?
2. A.applied
3. B.inductive and capacitive
4. C.reactive
5. D.zero

1 points  

QUESTION 4

1. In a circuit, true power is 800 watts and apparent power is 1000 VAR. What is the power factor?
2. A.0.6
3. B.1.25
4. C.0.8
5. D.0.85

1 points  

QUESTION 5

1. Q factor of the circuit is _______ to the power factor of the circuit.
2. A.Inverse to 
3. B.Equal to 
4. C.Greater than
5. D.Not related

1 points  

QUESTION 6

1. Which of the following device has poor or low power factor?
2. A.Computers
3. B.Synchronous Motor
4. C.Electric Furnace
5. D.Filament Bulb

1 points  

QUESTION 7

1. Power factor nearer to Zero is considered to be a good power factor.
2.  True
3.  False

1 points  

QUESTION 8

1. Inductors motors generally operate with leading power factor.
2.  True
3.  False

1 points  

QUESTION 9

1. Admittance is the reciprocal of ________
2. A.Reactance
3. B.Susceptance
4. C.Conductance
5. D.Impedance

1 points  

QUESTION 10

1. Find the power factor for the circuit where X_L = 200 Ω and Z = 350 Ω. Write 2 digits after decimal point.

2 points  

QUESTION 11

1. Find the capacitance (in µF)that has a reactive power of 50 var when connected across a 120 V 60 Hz source.

2 points  

QUESTION 12

1. Determine the total RMS current, active power and power factor of the circuit. R = 560 Ω, XL = 1 kΩ, XC = 1 kΩ. Vs = 20 ∠0⁰ V. Voltage is in RMS. 
2.  
3. Attach File
4.  

 

QUESTION 15

1. Determine the value of Z for the data in Q:14.

1 points  

QUESTION 16

1. Determine the resonant frequency in kHz for RLC series circuit. R = 10 Ω, L=0.5 mH and C= 10 μF. Use two digits after decimal point.

2 points  

QUESTION 17

1. If the bandwidth of a circuit is narrow, the selectivity is high.
2.  True
3.  False

1 points  

QUESTION 18

1. Below resonant frequency fr, series RLC circuit behaves as a predominantly capacitive circuit.
2.  True
3.  False

1 points  

QUESTION 19

1. The lower cut off and upper cut off frequency are 7 kHz and 12 kHz. What is the bandwidth of the circuit?
2. A.19 kHz
3. B.9.5 kHz
4. C.5 kHz
5. D.4.5 kHz

QUESTION 1

B.125 W

QUESTION 2

B.The larger of the two reactances is dominant

QUESTION 3

D.zero

QUESTION 4

C.0.8

QUESTION 5

A.Inverse to 

QUESTION 6

A.Computers

QUESTION 7

 False

QUESTION 8

 False

 QUESTION 9

D.Impedance

QUESTION 10

PF = 0.57

QUESTION 11

C = 9.21 µF

QUESTION 12

I_rms = 0.0357 A

P = 0.714 W

PF = 1

QUESTION 15

I cannot answer this because there is no data given and no Q:14

QUESTION 16

f = 2250.79 Hz

QUESTION 17

 True

QUESTION 18

 True

QUESTION 19

C.5 kHz

Step-by-step explanation

QUESTION 1

1. If the resistance of an electric bulb is 500 Ω and voltage across its ends is 250 V then power consumed by it is

Power is:

P = V²/R

Substitute the values:

P = 250²/500 = 125 W

Answer:

B.125 W

QUESTION 2

1. Which statement best describes the reactance in a series RLC circuit?

Answer:

B.The larger of the two reactances is dominant

QUESTION 3

1. At resonant frequency, what voltage is measured across two series reactive components?

Answer:

D.zero

QUESTION 4

1. In a circuit, true power is 800 watts and apparent power is 1000 VAR. What is the power factor?

Power Factor is:

PF = true power/apparent power

PF = 800W/1000VAR = 0.8

Answer:

C.0.8

QUESTION 5

1. Q factor of the circuit is _______ to the power factor of the circuit.

Answer:

A.Inverse to 

QUESTION 6

1. Which of the following device has poor or low power factor?

Answer:

A.Computers

QUESTION 7

1. Power factor nearer to Zero is considered to be a good power factor.

Answer:

 False

QUESTION 8

1. Inductors motors generally operate with leading power factor.

Answer.

 False

 QUESTION 9

1. Admittance is the reciprocal of ________

Answer:

D.Impedance

QUESTION 10

1. Find the power factor for the circuit where XL = 200 Ω and Z = 350 Ω. Write 2 digits after decimal point.

Power Factor is:

PF = XL/Z = 200/350

PF = 0.57

QUESTION 11

1. Find the capacitance (in µF)that has a reactive power of 50 var when connected across a 120 V 60 Hz source.

Reactive power is:

Q = V²/X_C

50 = 120²/X_c

X_C= 288 ohms

Capacitance can be solved using the capacitive reactance formula:

X_C = 1/2πfC

288 = 1/2π(60)C

C = 9.21 µF

QUESTION 12

1. Determine the total RMS current, active power and power factor of the circuit. R = 560 Ω, XL = 1 kΩ, XC = 1 kΩ. Vs = 20 ∠0° V. Voltage is in RMS. 

Impedance is:

Z² = R² + (XL -XC)²

Z² = 560² +(1000-1000)²

Z = 560 Ω

For the RMS current:

I_rms = V_s / Z = 20/560

I_rms = 0.0357 A

Active power is:

P = VI = (20)(0.0357)

P = 0.714 W

Power Factor is:

PF = R/Z = 560/560

PF = 1

QUESTION 15

1. Determine the value of Z for the data in Q:14.

I cannot answer this because there is no data given and no Q:14

QUESTION 16

1. Determine the resonant frequency in kHz for RLC series circuit. R = 10 Ω, L=0.5 mH and C= 10 μF. Use two digits after decimal point.

Resonant frequency is:

f = 1/(2π√LC)

f = 1/[2π√((0.5x10^-3)(10×10^-6))]

f = 2250.79 Hz

QUESTION 17

1. If the bandwidth of a circuit is narrow, the selectivity is high.

Answer:

 True

QUESTION 18

1. Below resonant frequency fr, series RLC circuit behaves as a predominantly capacitive circuit.

Answer:

 True

QUESTION 19

1. The lower cut off and upper cut off frequency are 7 kHz and 12 kHz. What is the bandwidth of the circuit?

Bandwidth is:

BW = f_u - f_L

BW = 12000 - 7000

BW = 5000 Hz or 5kHz

Answer:

C.5 kHz