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WorksheetsReview unit 4 part 2
Total questions: 47
Worksheet time: 12hrs 45mins
Refer to figure .What is the total circuit inductance between (BC)?
222 mH
200 mH
322 mH
150 mH
What is the relationship between voltage and current in resistive load?
Both voltage and current are in phase
Voltage is leading the current by 90 degrees
Current is lagging the voltage by 90 degrees
Voltage is lagging the current by 45 degrees
What is the relationship between voltage and current in capacitive load?
Both voltage and current are in phase
Voltage is leading the current by 45 degrees
Current is leading the voltage by 90 degrees
Voltage is lagging the current by 45 degrees
What is the relationship between voltage and current in inductive load?
Both voltage and current are in phase
Voltage is leading the current by 45 degrees
Current is lagging the voltage by 90 degrees
Voltage is lagging the current by 90 degrees
What is the relationship between voltage and current in capacitive load?
Both voltage and current are in phase
Voltage is leading the current by 90 degrees
Current is leading the voltage by 45 degrees
Voltage is lagging the current by 90 degrees
What is called the combination of reactance and resistance?
Resistance
Inductance
Capacitance
Impedance
What is the total opposition to current flow in an AC circuit?
Resistance
Inductance
Capacitance
Impedance
What is the circuit impedance of a circuit with R = 100Ω, XL = 150 Ω ?
10.15Ω
180 Ω
5.46Ω
15.12Ω
What is the circuit impedance of a circuit with R = 100Ω, XL = 300 Ω ?
10.15Ω
5.46Ω
15.12Ω
316 Ω
Refer the figure below. What is the circuit impedance?
1000 Ω
500 Ω
180.278 Ω
0.5Ω
Refer the figure below. What is the circuit impedance?
100 Ω
200.25 Ω
150Ω
0.5Ω
Refer the figure below. What is the circuit impedance?
109Ω
500Ω
150Ω
538.51Ω
Refer the figure below. What is the circuit impedance?
10Ω
5Ω
15Ω
5.51Ω
What is the magnetic field from coil one cuts across coil two, this induces voltage in coil two through a process?
Mutual capacitance
Mutual inductance
Mutual resistance
Self-induction
What is the mutual inductance?
opposition to current flow in a Capacitor
opposition to current flow in a inductor
The magnetic field from coil one cuts across coil two.
The circuit that opposes any change in the current flowing in it
Refer the figure below. What is the type of induction?
Mutual capacitance
Mutual inductance
Mutual resistance
Self induction
Refer to figure . What part of the Transformer protects the internal parts winding from damage?
Casing
Core
Insulation
Winding.
What part of the Transformer helps reduces power loss within the transformer and increase the strength of field?
Casing
Core
Insulation
Winding
Refer to figure . What part of the Transformer connected to the power source or supply?
Casing
Core
Secondary winding
Primary Winding
Refer to figure . What part of the Transformer induces a voltage into the secondary winding?
Casing
Core
Secondary winding
Primary Winding
Refer to figure . What part of the Transformer the voltage is induced from the primary to supply power to a load?
Casing
Core
Secondary winding
Primary Winding
Refer to figure . What part of the Transformer the material insulates the winding from each other (paper, varnish, and cotton)?
Casing
Core
winding
Insulation
Refer to figure . What part of the Transformer provides a connection point for transformer?
Casing
Core
winding
terminal leads
The terminal leads of the transformer primary winding are Marked as:
H1 & H2
X1 & X2
P1 & P2
S1 & S2
The terminal leads of the transformer Secondary winding are Marked as:
H1 & H2
X1 & X2
P1 & P2
S1 & S2
Refer to figure (Transformer Parts). What is the Function of the part (A)?
Provide the connection point of transformer
Induces a voltage into the secondary winding
reduces power loss within the transformer
supplies power to the electrical load
Refer to figure (Transformer Parts). What is the Function of the part (B)?
Protect the internal parts winding from damage
Induces a voltage into the secondary winding
reduces power loss within the transformer
The voltage is induced from the primary to supply power to a load
Refer to figure (Transformer Parts). What is the Function of the part (C)?
Provide the connection point of transformer
Induces a voltage into the secondary winding
reduces power loss within the transformer
supplies power to the electrical load
Refer to figure (Transformer Parts). What is the Function of the part (E)?
Protect the internal parts winding from damage
Insulates the winding from each other
The voltage is induced from the primary to supply power to a load
helps reduces power loss within the transformer
Refer to figure (Transformer Parts). What is the Function of the part (D)?
Protect the internal parts winding from damage
provide a connection point for the transformer
helps reduces power loss within the transformer
The voltage is induced from the primary to supply power to a load
What is the relationship between a transformer winding turns and output Voltage?
Inversely proportional
Directly proportional
Winding turns bigger than output voltage
Winding turns smaller than output voltage
What is the relationship between a transformer winding turns and output Current?
Inversely proportional
Directly proportional
Winding turns bigger than output voltage
Winding turns smaller than output voltage
The relationship between winding turns and voltage in the transformer is defined and calculated by the following formula
Np/Ns=Ip/Is
Np/Ns=Vp/Vs
Ns/Np=Vp/Vs
Np/Ns=Is/Ip
The relationship between winding turns and current in the transformer is defined and calculated by the following formula
Np/Ns=Ip/Is
Np/Ns=Vp/Vs
Ns/Np=Vp/Vs
Np/Ns=Is/Ip
The relationship between voltage and current in the transformer is defined and calculated by the following formula:
Vp/Vs=Ip/Is
Ip/Is=Vp/Vs
Ns/Np=Vp/Vs
Vp/Vs=Is/Ip
In a step–up transformer, the primary has _______________than the Secondary winding
Lower Current
Lower Voltage
Higher Voltage
More turns
In a step–down transformer, the primary has _______________than the Secondary winding
Lower Current.
Lower Voltage
Higher Voltage
More turns
How are transformer windings identified in Saudi Aramco?
X – primary -- H – secondary
H – primary -- X – secondary
P – primary --- s – secondary
T – primary ---- L – secondary
What is the secondary voltage and turns ratio of the transformer shown in figure
1500 V
1000 V
1660 V
830 V
What is the secondary voltage across terminal (1-2) and ( 3-4) of the transformer shown in figure
120 V,250 V
240 V,120 V
420 V,250 V
100 V,250 V
Refer to figure below .Calculate the primary current and Load voltage?
1.5 A, 480 V
2.5 A, 480 V
15 A, 400 V
1.5 A, 48 V
With no load and 100V on the primary of a 10:1 step down transformer, what
Value of current flows through the secondary winding?
10 A
1 A
100 A
0 A
The capacity of the transformer is measured in _________
Volts unit
Ampere unit
Watt unit
Volt Ampere unit
How much value of primary voltage of a transformer with one Ampere passing in the primary winding and 100 Volts & 2 Ampere in the secondary winding?
Vp=100 V
Vp=200V
Vp=50V.
Vp=150V.
In a transformer find the secondary voltage Vs , if the primary current Ip is 10A and Is is 2.5A and primary voltage Vs is 120V?
480V
120V
30V
220V
Calculate the primary voltage of a transformer with 110V AC in the secondary winding , 100 turns in the primary winding and 300 turns in the secondary winding?
660V
330V
110V.
36.7 V
How much value of current will flow with no load in secondary winding and 100 volts in primary winding of a transformer 10:1 ratio?
4 A
2 A
0 A
1 A
