Question 1 : What is not a frequency for ac current?
1. 50 Hz
2. 55 Hz
3. 0Hz
4. 60 Hz
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Question 2 : Which of the following is not ac waveform?
1. sinusoidal
2. square
3. constant
4. triangular
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Question 3 : When is tanf negative?
1. When inductive reactance is less than capacitive reactance
2. When inductive reactance is greater than capacitive reactance
3. When inductive reactance is equal to capacitive reactance
4. When inductive reactance is zero
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Question 4 : When is tanf positive?
1. When inductive reactance is less than capacitive reactance
2. When inductive reactance is greater than capacitive reactance
3. When inductive reactance is equal to capacitive reactance
4. When inductive reactance is zero
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Question 5 : What is the correct expression for the phase angle in an RLC series circuit?
1. f=tan^-1(X_L-X_C)/R
2. f=tan^-1 (X_L+X_C)/R
3. f=tan(X_L-X_C)/R
4. f=tan^-1 (X_L-X_C)
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Question 6 : In an RLC series phasor, we start drawing the phasor from which quantity?
1. Voltage
2. Resistance
3. Impedance
4. Current
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Question 7 : In an RLC circuit, the power factor is always ____________
1. Positive
2. Negative
3. Depends on the circuit
4. Zero
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Question 8 : In an RLC circuit, which of the following is always used as a vector reference?
1. Voltage
2. Resistance
3. Impedance
4. Current
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Question 9 : Find the total voltage applied in a series RLC circuit when i=3mA, V_L=30V, V_C=18V and R=1000 ohms.
1. 3.95V
2. 51V
3. 32.67V
4. 6.67V
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Question 10 : In ac circuit, resistance 5 ohm is connected with a capacitor having capacitive reactance 12 ohm. Supply of 260 V is connected to the circuit. Calculate the voltage across a capacitor.
1. 300 V
2. 200 V
3. 240 V
4. 100 V
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