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WorksheetsSingle Phase Revision
Total questions: 23
Worksheet time: 20mins
The power absorbed by a pure inductive circuit and pure capacitive circuit is
Zero; NON Zero
NON Zero; Zero
NON Zero; NON Zero
ZERO; ZERO
The product of rms values of current and voltage is called as
Apparent Power
Real Power
Imaginary Power
Non of the above
The ratio of maximum value to effective value of an alternating quantity is called
Crest Factor
Peak factor
Amplitude Factor
All of the above
Alternating voltage can be generated by
A) By rotating a coil in a magnetic field
B) By rotating a magnetic field within a stationary coil
Both A & B
Nither A & B
In case of Inductive circuit, Frequency is ___________Proportional to the inductance (L) or inductive reactance (XL).
DIrectly
Inversely
No Effect
In case of Capacitive circuit, Frequency is ___________Proportional to the Capacitance (C) or Capacitive reactance (XC)
Directly
Inversely
No Effect
Power Factor (Cos θ) =_________?
KW/KVA
R/|Z|
The Cosine of angle between Current and voltage
All of the above
Average value of a sinusoidal alternating signal is ————-for a full cycle.
ZERO
Maximum
Finite Value
Infinite
For a series RLC circuit at resonance, the voltage drop across capacitive and inductive components is ——-
Large
Small
Zero
Infinite
Color Code for Phase (Live), Neutral and ground in a single phase circuit are __&_
Red, Black & Green
Red, Green & Black
Yellow, Brown & Green
None of the above
The angle between votlage and current is ___ and thus power factor (cos θ) is ___
0,1
25, 0.9063
50, 0.6427876
Non of the above
For the given vector or phasor diagram, the circuit behaves as pure ____
Resistance
Inductance
Capacitance
All of the above
For the vector or Phasor diagram shown, the circuit behaves as pure ____
R
L
C
All of the above
For the given vector or phasor diagram, the angle between voltage and current is ___ and its power factor (Cos θ) is ___ (consider red color as votlage)
90, 0
150, −√3/2
120, -0.5
None of the above
For the given vector or phasor diagram, the circuit behaves as ___
L
R
RC
RL
For the given vector or phasor diagram, the circuit behaves as ___
L
R
RC
RL
For the given vector or phasor diagram, the circuit behaves as ___
L
R
RC
RL
Formula for True, active, real power is ?
P= VI cos θ
Q= V I Sin θ
S = V I
Both P & Q
Formula for Wattless, Imaginary, reactive power is ?
P= VI cos θ
Q= V I Sin θ
S = V I
Both P & Q
If the angle between Voltage and Current is increasing, then its power factor is __
tending towards to 1
tending towards 0
cannot say
In a series RLC circuit. if XL > XC, the circuit behaves as
RC circuit
RL circuit
Pure R
In a series RLC circuit. if XL = XC, the circuit behaves as
RC circuit
RL circuit
Pure R
In a series RLC circuit. if XL < XC, the circuit behaves as
RC circuit
RL circuit
Pure R
