Electrical Engineering Practice bits -4
1. Which of the following is a secondary cell
a.
Voltaic
cell
b.
Denial
cells
c.
Primary
cell
d.
Lead
acid cell
2. The ratio of RMS value
to average value of an alternating quantity is known as
a.
Power
factor
b.
Peak
factor
c.
Form
factor
d.
Pitch
factor
3. VIcos∅ is called
a.
Reactive
power
b.
Real
power
c.
Apparent
power
d.
Total
power
4. A tolerance band of 20%
in the value of carbon resistor is represented by
a.
Gold
band
b.
Black
band
c.
Silver
band
d.
Without
any band
5. Which of the following
is a semi conductor
a.
Copper
b.
Aluminium
c.
Silver
d.
Silicon
6. Unit of heat energy is
a.
KWH
b.
KVA
c.
KVAR
d.
KCAL
7. The capacity of storage
cell is measured in
a.
Amp-hour
b.
Watt-hour
c.
Joule
d.
Coulomb
8. Two identical coils are
having self inductance of 4mH with mutual inductance between them is 3mH the co
efficiency coupling is ____
a.
1
b.
1.5
c.
0.75
d.
2
9. Which of the following
are insulators
a.
Rubber
b.
Glass
c.
P.V.C.
d.
All
the above
10. The unit of magneto
motive force is
a.
Weber
b.
Amp/m
c.
Henry
d.
Amp-turn
11. The quantity efficiency
of a lead acid battery is between
a.
90-95%
b.
72-78%
c.
60-65%
d.
10-15%
12. A 24V lead acid
–storage battery has 12 numbers of 2V cell
a.
All
in parallel
b.
All
in series
c.
Both
a and b
d.
None
13. In dc generators lap
winding is used for
a.
Low
voltage, low current
b.
Low
voltage high current
c.
High
voltage, high current
d.
High
voltage low current
14. Aluminium is a -------
a.
Paramagnetic
material
b.
Diamagnetic
material
c.
Ferro
magnetic material
d.
Soft
magnetic material
15.
Inter
poles in DC machines are used for
a.
Increase
voltage
b.
Increase
current
c.
Balancing
induced emf
d.
Improving
commutation
16. The transformer are
working on the principle of
a.
Conversion
energy
b.
Eddy
current
c.
Self
induction
d.
Mutual
induction
17. Fuse wire is prepared
using
a.
Copper
b.
Aluminium
c.
Lead
and tin
d.
Silver
and iron
18. A dynamo
a.
Converts
mechanical energy to electrical energy
b.
Converts
EE to ME
c.
Creates
mechanical energy
d.
Amplify
electrical energy
19. A six pole generator
has 2 parallel paths. The generator is wound in___
a.
Lap
winding
b.
Ware
winding
c.
Concentric
winding
d.
All
the above
20. BHP stands for
a.
British
horse power
b.
British
high power
c.
Belt
horse power
d.
Break
horse power
