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pawan kumar
Electrical Fundamentals Quiz
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by
pawan kumar
November 3, 2016
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1
If the phase voltage in a star connected generator is 200V what will be the line voltage?
115V
200V
346V
2
A starter generator has a
low resistance series field and a low resistance shunt field
low resistance series field and a high resistance shunt field
high resistance series field and a low resistance shunt field
3
A capacitor in a single phase AC motor is to
prevent spikes
block DC
provide a phase shift
4
What value is the same as the equivalent D.C. heating effect?
Root Mean Square
Average
Peak
5
Decreasing the field current in a shunt motor will
increase speed and decrease torque
increase speed and increase torque
decrease speed and increase torque
6
In a delta-connected generator
line volts = phase volts, line current = root 3 times phase current.
line volts = phase volts, line current = phase current divided by root 3
line voltage = root 3 times phase voltage, line current = phase current
7
When measuring the phase and line voltages of a generator, it was found that line and phase voltages were equal. The generator is?
delta wound
star wound
either delta or star wound
8
To change the direction of a 3-phase induction motor you would
swap two of the stator connections
swap all of the input connections
remove one of the input connections
9
To calculate generator output you need to know the
armature speed and number of series conductors
armature speed and number of parallel conductors
armature speed and field strength
10
The symbol for flux density is
H
B
ø
11
The frequency of the output of a 4 pole generator is 400 Hz. The generator is turning at
12000 RPM
6000 RPM
3000 RPM
12
When comparing the average values of an AC generator output, to the peak values
average voltage = same as the peak voltage
average voltage = 0.63 x peak voltage
average voltage = 0.707 x peak voltage
13
The voltage rating of a capacitor is
the max voltage that can be constantly applied
the min voltage required to charge
the normal operating voltage
14
Magnetic inclination is the least at the
poles
equator
isoclines
15
To reduce eddy currents in a transformer you would
reduce the thickness of laminations in the magnetic core
increase the thickness of laminations in the magnetic core
reduce the number of turns on the primary winding
16
An accumulation of hydrogen on the plates of a battery is known as
hydration
polarization
ionization
17
If a heavy mechanical load is removed from a series motor
the speed will decrease and the armature current will decrease
the speed will increase and the armature current will decrease
the speed will increase and the armature current will increase
18
A 50 μF capacitor is fed with a current of 25 mA. How long will it take to charge it to 100V?
1 s
0.2 seconds
12 minutes
19
The method of ascertaining the voltage of a standard aircraft lead-acid battery is by checking
the voltage on open circuit
the voltage with rated load switched ON.
the voltage off load
20
Conventional current flow inside a battery is from
cathode to anode
either anode to cathode or cathode to anode, depending on the active elements
anode to cathode
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