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Q 1/30
Score 0
The three phase voltage in Bahrain is:
30
415 V
240V
415A
380V
Q 2/30
Score 0
How is the voltage transformer connected with the load?
30
star
series
parallel
delta
30 questions
Q.
The three phase voltage in Bahrain is:
1
30 sec
Q.
How is the voltage transformer connected with the load?
2
30 sec
Q.
In a polyphase system, how many single phase wattmeters is required to measure the total power of the system? ((n: the number of single phase wattmeter))
3
30 sec
Q.
The capacity of three-phase transformers is measured in:
4
30 sec
Q.
In an ideal three-phase transormer with a transformer ratio of 4:1, what is the input power if the output power is 1000 W?
5
30 sec
Q.
In an three-phase transformer, what is the input power if the output power is 25000 W and the power losses is 0.5KW?
6
30 sec
Q.
Which of the following losses is not part of the total transformer losses?
7
30 sec
Q.
In a balanced delta-connected three-phase system, what is the value of the neutral current?
8
30 sec
Q.
In a balanced star-connected three-phase system, what is the value of the neutral current?
9
30 sec
Q.
Which of the following is the correct equation for active power (P) in a three-phase system?
10
30 sec
Q.
Which of the following is the correct equation for reactive power (Q) in a three-phase system?
11
30 sec
Q.
Which of the following is the correct equation for apparent power (S) in a three-phase system?
12
30 sec
Q.
The power that bounces back and forth in a three-phase system is called
13
30 sec
Q.
The useful power or the true power dissipated in an AC system or in a three-phase system is called ...................... .
14
30 sec
Q.
In an AC system is the product of the load voltage and load current
15
30 sec
Q.
In a delta connection, what is the phase voltage if the line current is 15 A and the line voltage is 415 V?
16
120 sec
Q.
10. In a star connection, what is the phase voltage if the line current is 15 A and the line voltage is 415 V?
17
30 sec
Q.
The part of the transformer which is connected to the power supply is:
18
30 sec
Q.
The part of the transformer which is connected to the load is:
19
30 sec
Q.
It is used to sense faults occuring inside the transformer.
20
45 sec
Q.
It is used to expel boiling oil during heavy internal faults.
21
45 sec
Q.
it's used to controls the moisture level in the transformer
22
45 sec
Q.
It's used to cool the transformer oil.
23
45 sec
Q.
Identify the image shown
24
45 sec
Q.
identify the image shown
25
45 sec
Q.
Which of the following links the primary and secondary winding of the transformer?
26
45 sec
Q.
What connection is shown?
27
30 sec
Q.
A Star-star (Y-Y) three-phase transformer has: Np = 6500 turns, VLine-primary = 11 kV and VLine-secondary = 415 V. What is the primary phase voltage?
28
120 sec
Q.
A Star-star (Y-Y) three-phase transformer has: Np = 6500 turns, VLine-primary = 11 kV and VLine-secondary = 415 V. What is the number of turns in secondary winding ?
29
120 sec
Q.
A Delta-delta (Δ-Δ)three-phase transformer has, Np1 = 6000 turns, NS1 = 300 turns, Vphs1 =
415V and VLS = 415 V. Calculate VPhp1.
