Alternating Current (Part 4)
61) What is star connection?
ANSWER) Three windings have six terminals. Three terminals are connected at a common point called star point and other three terminals are available to supply loads etc.
62) What is delta connection?
ANSWER) One terminal of winding is connected to other to form closed loop.
63) Is neutral available in delta connection?
ANSWER) No.
64) How line voltage and phase voltage are related in star connection?
ANSWER) Vp =VL/√3
65) How line voltage and phase voltage are related in delta connection?
ANSWER) VP = VL
66) How line current and phase current are related in star connection?
ANSWER) IL = IP
67) How line current and phase current are related in delta connection?
ANSWER) IP = IL/√3
68) What is lagging power factor?
ANSWER) A power factor is said to be lagging if current lags behind the voltage.
69) What is leading power factor?
ANSWER) A power factor is said to be leading if current leads the voltage.
70) What is an inductive circuit?
ANSWER) It is circuit in which inductance dominates over resistance and capacitance.
71) What is the power factor of inductive circuit?
ANSWER) Lagging power factor
72) What is power factor of a capacitive circuit?
ANSWER) It is leading.
73) What is the power factor of pure resistive network?
ANSWER) Unity.
74) Name the parameter of circuit which dissipate electrical energy?
ANSWER) Resistance.
75) Name the parameter of circuit which stores energy in the form of magnetic field?
ANSWER) Inductance
76) Name the parameter of circuit which stores energy in the form of electric field?
ANSWER) Capacitance.
77) Does the resistance depend upon frequency?
ANSWER) Yes, because of skin effect.
78) What is the relation between frequency and inductive/capacitive reactance?
ANSWER) Inductive reactance is directly proportional to frequency while capacitive reactance is inversely proportional to frequency.
79) What is a resonance/tuning circuit?
ANSWER) These are RLC circuits in which by varying frequency, XL can be made equal to XC.
80) If a series resonance occurs, what would be the impedance at resonance?
ANSWER) It will be minimum.
ANSWER) Three windings have six terminals. Three terminals are connected at a common point called star point and other three terminals are available to supply loads etc.
62) What is delta connection?
ANSWER) One terminal of winding is connected to other to form closed loop.
63) Is neutral available in delta connection?
ANSWER) No.
64) How line voltage and phase voltage are related in star connection?
ANSWER) Vp =VL/√3
65) How line voltage and phase voltage are related in delta connection?
ANSWER) VP = VL
66) How line current and phase current are related in star connection?
ANSWER) IL = IP
67) How line current and phase current are related in delta connection?
ANSWER) IP = IL/√3
68) What is lagging power factor?
ANSWER) A power factor is said to be lagging if current lags behind the voltage.
69) What is leading power factor?
ANSWER) A power factor is said to be leading if current leads the voltage.
70) What is an inductive circuit?
ANSWER) It is circuit in which inductance dominates over resistance and capacitance.
71) What is the power factor of inductive circuit?
ANSWER) Lagging power factor
72) What is power factor of a capacitive circuit?
ANSWER) It is leading.
73) What is the power factor of pure resistive network?
ANSWER) Unity.
74) Name the parameter of circuit which dissipate electrical energy?
ANSWER) Resistance.
75) Name the parameter of circuit which stores energy in the form of magnetic field?
ANSWER) Inductance
76) Name the parameter of circuit which stores energy in the form of electric field?
ANSWER) Capacitance.
77) Does the resistance depend upon frequency?
ANSWER) Yes, because of skin effect.
78) What is the relation between frequency and inductive/capacitive reactance?
ANSWER) Inductive reactance is directly proportional to frequency while capacitive reactance is inversely proportional to frequency.
79) What is a resonance/tuning circuit?
ANSWER) These are RLC circuits in which by varying frequency, XL can be made equal to XC.
80) If a series resonance occurs, what would be the impedance at resonance?
ANSWER) It will be minimum.
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