Electrical
1.
The DC generator works on the principle of?
A] Fleming’s left hand rule
B] Fleming’s right hand rule
C] Lenz law
D] none of the above Ans: b
2.
A 3 phase 4 wire system is commonly used for ?
A] primary distribution
B] secondary distribution
C] primary transmission
D] secondary transmission Ans:b
3.
A current
is said to be alternating when it changes in?
A] magnitude only
B] direction only
C] both magnitude and direction
D] none Ans:c
4.
The slip of an induction motor normally does not
depend on
A] rotor speed
B] synchronous speed
C] shaft torque
D] core loss component Ans:d
5.
The frequency of voltage at the secondary of a
transformer is
A] greater than that of primary
B] equal to that of primary
C] less than that of primary
D] none of the above Ans:b
6.
Which of the following power plant is least
reliable
A] wind
B] tidal
C] geothermal
D] solar Ans:a
7.
DC motors are still preferred for use in
A] electric excavators, steel mills and
carnes
B] lathe and machine tools
C] flour mills and jaw crushers
D] paper industry Ans:a
8.
The highest transmission voltage in india is
A]750kv
B] 400kv
C] 220kv
D] 132kv Ans:b
9.
A negative sequence relay is commonly used to
protect
(A)
an alternator
(B) an
transformer
(C) a transmission line
(D) a bus bar Ans:a
10.
For enhancing the power transmission in along
EHV transmission line, the most
preferred method is to connect a
(A)
Series inductive compensator in the line
(B)
Shunt inductive compensator at the receiving end
(C)
Series capacitive compensator in the line
(D)
Shunt capacitive compensator at the sending end Ans:c
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11.
In
a series RLC circuit that is
operating above the resonant frequency, the current
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12.
If
the resistance in parallel with a parallel resonant circuit is reduced, the
bandwidth
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13.
If
the value of C in a series RLC circuit is
decreased, the resonant frequency
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14.
If
two currents are in the same direction at any instant of time in a given
branch of a circuit, the net current at that instant
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15.
The
Thevenin equivalent voltage is
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16.
In
a
 -connected source feeding a Y-connected
load, |
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17. Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by |
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18. A given power supply is capable of
providing 6 A for 3.5 h. Its ampere-hour rating is
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19. A certain appliance uses 350 W. If
it is allowed to run continuously for 24 days, how many
kilowatt-hours
of energy does it consume?
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20.
How many primary volts must be applied to a transformer with a turns ratio of
0.1 to obtain a secondary voltage of 9 V?
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21.
A 1.5 k
 resistor and a
coil with a 2.2 k inductive
reactance are in series across an 18 V ac source. The power factor is |
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22.
To increase the current in a series RL circuit, the
frequency
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23. A sine wave voltage is applied across a capacitor. When the frequency of the voltage is decreased, the current |
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24.
Two 1.5 V cells are connected series opposing across two 100
resistors in series.
Total current flow is |
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25.
A phasor represents
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Ans:a
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