Electrical Engineering Practice bits
2. An
amplifier can be converted to an oscillator using
a.
Positive feedback
b.
Negative feedback
c.
Zero feedback
d.
Null feedback
3. Which
one of the following power semiconductor can be turned on and turnoff using
gate
a.
SCR
b.
GTO
c.
MOSFET
d.
BJT
4. The
total resistance of a 90 ohms resistor and a 60 ohm resistor connected in
parallel is
a. 16
ohm
b. 36
ohm
c. 45
ohm
d. 15
ohm
5. In
parallel RC circuit 1A flows through resistive branch and 1A through the
capacitive branch. What is total current
a.
1A
b.
2A
c.
1.41A
d.
2.28A
6. A
100/5A current transformer is used in conjunction with a 5A ammeter. If the
ammeter reads 3A. the line current will be
a.
30A
b.
300A
c.
600A
d.
60A
7. What
is the formula for reactive power in 3-phase system
a. 3VLIL
sin
b.
VphIph sin
c.
VLIL cos
d.
VLIL sin
8. Mercury
vapour lamp contain
a.
Neon and mercury
b.
Sodium and mercury
c.
Argon and mercury
d.
Argon and sodium
9. Breather
of a distribution transformer contain
a.
Calcium chloride
b.
Sodium chloride
c.
Calcium carbonate
d.
Dry air
10. Very
suitable motor for food mixer is
a. Capacitor
start motor
b. Repulsion
motor
c. Capacitor
run motor
d. Universal
motor
11. A
constant speed dc motor is
a. Differential
compound motor
b. Shunt
motor
c. Cumulative
compound motor
d. Series
motor
12. Magnetic
and mechanical losses in dc machine are collectively known as
a. Iron
losses
b. Stray
losses
c. Machine
losses
d. Hysteresis
losses
13. Unit
of reluctance is
a. Ampere
turns/meter
b. Web/meter2
c. Amperes
turns/web
d. Web/ampere
turns
14. In
an inductive circuit
a. Current
in phase with voltage
b. Current
leads voltage
c. Current
lags the voltage
d. Voltage
lags current
15. When
a lead acid cell is fully charged its anode is
a. Lead
b. Lead
sulphate
c. Lead
peroxide
d. Spongy
lead
16. For
a 6 pole 1200rpm alternator the frequency will be
a. 60Hz
b. 50
Hz
c. 40
Hz
d. 70
Hz
17. Gravity
controlled instrument has to be kept
a. horizontal
b. vertical
c. any
position
d. inclined
18. what
is the use of inter pole in DC generator
a. to
get large voltage
b. to
get large current
c. to
improve commutation
d. to
limit running current
19. which
diode used as voltage regulator
a. PN
junction
b. Schoott
key diode
c. Photo
diode
d. Zener
diode
20. Rectification
efficiency of half wave rectifier is
a. 802%
b. 40.6%
c. 32%
d. 86.2%
21. The
colour bands for resistor of value 47kΩ±5% tolerance is
a. Yellow,
violet, yellow, silver
b. Yellow,
violet, orange, silver
c. Yellow,
violet, orange, gold
d. Yellow,
violet, brown, gold
