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Single Phase AC Circuit - Multiple Choice Questions, Blanks & True False

Single Phase AC Circuit - Multiple Choice Questions, Blanks & True False
**Points :**single phase ac circuit, multiple choice questions and answer,single phase ac circuit - fill in the blanks,single phase ac circuit - true or false, single phase ac circuit mcqs, objective type questions principles of electrical engineering
Multiple Choice Questions
1. In RL series circuit, V_{L} __________ V_{R}.

(a) **Leads**

(b) Lags

(c) Equal

2. The phase angle of a series RLC circuit is leading, if

(a) X_{L} = 0

(b) **X**_{C}>X_{L}

(c) R = 0

3. The distribution of flux in a conductor is called

(a) Q of coil

(b) Form factor

(c) **Skin effect**

4. The inductive reactance denoted by

(a) **X**_{L}

(b) X_{C}

(c) None of them

5. If X_{L} = 2πfL, then value of π it is.

(a) **3.142**

(b) 21/7

(c) None of them
Fill in the blanks
1. In an a.c circuit, the voltage across R, L and C are 30 V. 60 V and 20 V respectively. The applied voltage is __50 v__.

2. In a parallel RC circuit, the current always __leads__ the applied voltage.

3. In a parallel RC circuit, the __voltage__ is the same across each elements.

4. At __very low__ frequencies the parallel RL circuit behaves as almost purely inductive.

5. In a series RLC circuit, if XL>XC, the circuit behaves as an __inductive__ circuit.

6. In a series resonance circuit impedance is __minimum__ at resonance frequency.

7. The resistance offered by a capacitor in an a.c. circuit is given as __1/2πfc__.

8. In an a.c. circuit with XC and R in series, if frequency is __increased,__ the current will increase.

9. In an a.c. circuit with XL and R in series the current will be __reduced__.

10. The volt-ampere is a unit of __apparent power__.
True and False
1. The unit of inductive reactance is Ohm. **T**

2. If X_{L}>X_{C}, the current leading in circuit. **F**

3. If X_{L} X_{C}, then circuit is resonant. **T**

4. X_{L} is directly proportional to 2πfL. **T**

5. X_{L} is directly proportional to 2πfc. **F**

6. In RLC series circuit, if X_{C}>X_{L}, the circuit behaves as a capacitive circuit. **F**

7. In a parallel RLC circuit, if X_{L}X_{C}, the circuit behaves as inductance. **T**

8. In a RLC circuit resonance occurs; when L =-C. F

9. The unit of capacitance is Mho. **F**

10. Power factor improved by adding capacitor. **T**
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