Revesion 2

Quiz by Ali

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44 questions
• Q1
Three phase transformer has................. Terminal
6
12
10
3
30s
• Q2
The single phase transformer has ………………. Coil
8
1
2
12
30s
• Q3
The coil which connected to load in transformer Name ……………. Coil.
primary coil
current coil
secondary coil
voltage coil
30s
• Q4
The coil which connected to power supply in Transformer name ………. Coil
Secondary coil.
Main coil
Primary coil
Extra coil
30s
• Q5
30s
• Q6
The picture shows …………… connection of 3 phase transformer
D / Y
Y / Y
D / D
Y / D
30s
• Q7
the main parts of a synchronous generator
stator frame
stator core
rotor
All
30s
• Q8
The correct tool to be used to replace the bearing of a motor is
Pliers
Bearing Puller
Screw Driver
Hammer and chisel
30s
• Q9
Find the number of poles required on the rotor of generator whose output frequency is 50 HZ if ns=3000 R.P.M______
2 HZ
4pole
2 pole
6pole
120s
• Q10
At what speed must be rotor of generator rotate to generate 50 HZ power in a four pole machine _____
N=1800 R.P.M
N= 3000 R.P.M
N= 1500 R.P.M
N= 15OO HZ
120s
• Q11
the figure refers to________
flow power diagram
open circuit characteristic
non of them
120s
• Q12
The purpose of excitation …………..
to use high speed
to give the energy
all of the
To provide the field current for magnetizing the machine
120s
• Q13
The relationship between speed, frequency and number of poles.
f=(N*P)/120
f=Ns-Nr
F=1/T
All of them
30s
• Q14
The formula for voltage regulation is.......
=[(VnL-VfL)/VfL]*100
=VnL/VfL
=[(VfL-VnL)/VfL]*100
=[(VnL-VfL)/VnL]*100
45s
• Q15
Three-phase induction motor is_________
a machine, which convert the heating energy into mechanical energy.
all the above
a machine, which convert the mechanical energy into electrical energy.
a machine, which convert the electrical energy into mechanical energy.
45s

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