
Ohm’s law applicable for
(a)
linear circuits only (b)
non linear circuits only (c)
circuits
(d)
none of these
both linear and non linear
Ans: a

a)
Unit of current is
Ampere (b)
Volt (c)
Watt
(d)
Volt-ampere
Ans: a

(a)
What is the equivalent resistance when 10 Ohms and 20 Ohms resistors are
connected in series
35 Ohms (b)
25 Ohms (c)
30Ohms
(d)
none of these
Ans: c

Form factor is defined as the ratio of
(a)
Average value to Maximum value (b)
(c)
Peak value to R.M.S Value (d)
Maximum value to Average value
R.M.S Value to Average value
Ans: d

(a)
Ans: c
R.M.S Value of full wave rectified sinusoidal voltage is
VM/3 (b)
VM/2 (c)
VM/Ö2
(d)
none of these

(a)
Power factor for resistive load is
Zero (b)
Unity (c)
Infinity
(d)
0.2
Ans: b

(a)
voltage is a ——quantity
Scalar (b)
Vector (c)
Scalar and Vector
(d)
none of these
Ans: b

(a)
In 3 phase star circuit, phase voltage is
VPh =Ö3 VL (b)
VPh = VL /Ö3 (c)
VPh = VL (d)
VPh =3 VL
Ans: b

(a)
In 3 phase delta circuit, line current is
IL =I Ph (b)
IL =2 I Ph (c)
IL =3 I Ph (d)
IL =Ö3 I Ph
Ans:d

What is the equivalent resistance when 20O ohms and 20O ohms resistors are
connected in parallel
(a)
45 Ohms (b)
(c)
54
Ohms
10Ohms
(d)
30Ohms
Ans: b

(a)
Ans:a
Voltage-Current relationship in resistor element is
In phase (b)
Out of phase (c)
No Relation (d)
constant

(a)
For high voltage applications which type of 3 phase circuit to be Preferred
Star (b)
Delta (c)
Star or Delta
(d)
Neither Star nor Delta
Ans: b

(a)
What is the unit of Reactive Power
KVA (b)
KW (c)
HP (d)
KVAR
Ans:d

(a)
R.M.S Value of Half wave rectified sinusoidal voltage is
VM/3 (b)
VM/2 (c)
VM/Ö2 (d)
none of these
Ans: b

(a)
Current is defined as
Charge/time (b)
Time/charge (c) power/time (d)
None of these
Ans:a

Active elements are
(a)
Voltage sources only (b)
Current sources only (c)
(d)
Both Voltage and Current sources
Ans: d

In Capacitive circuit, Current flows in the capacitor
(a)
i=C (dv/dt) (b)
(c)
i=C(di/dt) (d)
Ans: a
i=V(dc/dt)
i=Ct
Resistors only

Unit of voltage is
(a)
Ampere (b)
Volt (c)
(d)
Volt- ampere
Watt
Ans: b

Peak factor is defined as the ratio of
(a)
Average value to Maximum value (b)
Maximum value to Average value
(c)
Peak value to R.M.S Value
R.M.S Value to Average value
Ans: c

Average value is
(a)
area/period (b)
period/area
(c)
length/area (d)
none of these
Ans: a

Unit of power is
(a)
Ampere (b)
(c)
Watt (d)
Volt
joules
Ans:c

Unit of apparent power is
(a)
Ampere (b)
(c)
Watt (d)
Ans:d
Volt
Volt-ampere
(d)

Unit of energy is
(a)
KWH (b)
(c)
Watt
Volt
(d)
Volt-ampere
Ans:a

A.C has
(a)
Constant magnitude (b)
(c)
Fixed Polarities (d)
Variable magnitude
Constant magnitude and Fixed Polarities
Ans: b

Passive elements are
(a)
Voltage sources only (b)
Current sources only
(c)
Resistors ,inductors and capacitors (d)
Both Voltage and Current sources
Ans: c

In D.C , inductor acts as
(a)
Short circuit (b)
Open circuit
(c)
both (a)&(b) (d)
none of these
Ans: a

In Unilateral Network the current flows in
(a)
Unidirectional (b)
(c)
Rotational (d)
Bidirectional
None of these
Ans: a

Workdone is
(a)
F.d (b)
(c)
IR (d)
Ans: a
E/F
None of these

Unit of Resistance is
(a)
Ampere (b)
(c)
Watt (d)
Volt
ohms
Ans: d

Unit of inductance is
(a)
Ampere (b)
(c)
Watt (d)
Volt
henry
Ans: d

Unit of capacitance is
(a)
Ampere (b)
(c)
Watt (d)
farad
henry
Ans: b

For high current applications which type of 3 phase circuit is Preferred
(a)
Star
(b)
Delta
(c)
Star or Delta
(d)
Neither Star nor Delta
Ans: a

For low voltage applications which type of 3 phase circuit to be Preferred
(a)
Star (b)
(c)
Star or Delta
Ans: a
Delta
(d)
Neither Star nor Delta

Unit of charge is
(a)
Ampere (b)
(c)
Watt
(d)
coulomb
henry
Ans: b

EMF is
(a)
Election motion force (b)
(c)
Electro motive force (d)
Electrical motion force
None of these
Ans: c

Voltage-Current relationship in inductor element is
(a)
In phase (b)
(c)
90 (lag) (d)
90 (lead)
constant
Ans: c

Voltage-Current relationship in capacitor element is
(a)
In phase (b)
(c)
90 (lag) (d)

90 (lead)
constant
When two inductors are connected in series, equivalent inductance is
(a)
L1+L2 (b)
1/(L1+L2)
(c)
L1.L2 (d)
None of these
Ans: a

When two capacitors are connected in series, equivalent capacitance is
(a)
C1+C2 (b)
(c)
L1.L2 (d)
Ans: d
1/(C1+C2)
(1/c1)+(1/c2)

R.M.S Value of full wave rectified sinusoidal voltage is
(a)
VM/3 (b)
VM/2
(c)
VM/Ö2
d)
none of these
Ans:c

Form factor of full wave rectified sinusoidal voltage is
(a)
1.21 (b)
(c)
4.44
1.11
(d)
none of these
Ans: b

Power factor for pure inductor
(a)
0(lead) (b)
0
(c)
0(lag)
none of these
(d)
Ans: c

Power factor for pure capacitor
(a)
0(lead) (b)
0
(c)
0(lag)
none of these
(d)
Ans: a

Frequency is defined as
(a)
No of cycles/sec (b)
(c)
1/cycles (d)
Ans: a
time/cycles
None of these

In Series resistive circuit, voltage across each resistor is
(a)
divided (b)
(c)
no change (d)
constant
None of these
Ans: a

In Series resistive circuit current through each resistor is
(a)
divided (b)
(c)
0
(d)
same
None of these
Ans:b

When two inductors are connected in parallel, equivalent inductance is
(a)
L1+L2 (b)
(1/L1)+(1/L2)
(c)
L1.L2
None of these
(d)
Ans: b

When two capacitors are connected in parallel, equivalent capacitance is
(a)
L1+L2
(b)
(1/L1)+(1/L2)
(c)
C1+C2
(d)
None of these
Ans:c

A sinusoidal Wave form is
a)sine wave form b) triangle wave form
c) both(a)&(b) d)none of these
Ans:a

(a)
Ans: c
In 3 phase delta circuit, phase voltage is
VPh =Ö3 VL (b)
VPh = VL /Ö3 (c)
VPh = VL (d)
VPh =3 VL

In 3 phase star, line current is
(a)
IL =I Ph (b)
IL =2 I Ph
(c)
IL =3 I Ph (d)
IL =Ö3 I Ph
Ans:a

Average value of half wave rectified sine waveform is
a)
Vm/? b)
2Vm/?
c)
Vm/2 d)
none of these
Ans:a

Average value of full wave rectified sine waveform is
a)
Vm/? b)
2Vm/?
c)
Vm/2 d)
none of these
Ans:b

Form factor of half wave rectified sine waveform is
a)
Vm/? b)
c)
1.57 d)
2Vm/?
none of these
Ans: c

Peak factor of half wave rectified sine waveform is
a)
Vm/? b)
c)
Vm/2 d)
2
none of these
Ans:b

Form factor of full wave rectified sine waveform is
a)
1.11 b)
2Vm/?
c)
1.57 d)
none of these
Ans:a

Peak factor of full wave sinusoidal waveform is
a)
Vm/? b)
c)
Vm/2
d)
square root of 2
none of these
Ans:b

In ac circuit, the ratio of kW/kVA is
A. power factor B. form factor
C. load factor D. diversity factor
Ans: A
 Suppose that two ac waves have the same frequency but differ in phase by exactly
1/20 of a cycle. What is the phase difference between these two waves?
A. 18 deg B. 20 deg
C. 36 deg D. 5.73 deg
Ans: A

Q factor of an inductive coil is given by
A. 2π fL/R B. 2π fr/R
C. R/Z D. lr/l
Ans: B

[2] The peak voltage in an ac wave is always
A. greater than the average voltage B. less than the average voltage
C. greater than or equal to average voltage D. less than or equal to the average voltage
Ans: C

Ans:A
The unit which indicates the rate at which energy is expended?
A. Watt B. Ampere-hour
C. Coulomb D. Volt