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WorksheetsReview unit 4 part 4
Total questions: 52
Worksheet time: 13hrs 0mins
Which type of polarity is shown in the figure?
Parallel
Additive
Series
Subtractive
According to the voltmeter reading. What type of polarity is shown in the figure?
Series
Subtractive
Additive
Parallel
What test is being performed in the figure shown?
polarity test
short circuit test
ground test
open circuit test
What test is being performed in the figure shown?
polarity test
short circuit test
ground test
open circuit test
What test is being performed in the figure shown?
polarity test
short circuit test
ground test
open circuit test
What is Continuity test on a transformer?
What is Insulation test on a transformer?
What is Ground test on a transformer?
Which one of the following is an advantage of three-phase power over single-phase power?
There will be interruption total power.
It only supplies line-to-line single-phase voltage.
It does not have constant level power and high cost
It can service for both single and three-phase load.
Which one of the following is an advantage of three-phase power over single-phase power?
Smaller operating machines with better operating characteristics
It only supplies line-to-line single-phase voltage.
It does not have constant level power and high cost
It can service for three-phase load.
Which one of the following is an advantage of three-phase power over single-phase power?
There will be interruption total power.
It only supplies line-to-line single-phase voltage.
It has 3-phase voltage and 3-line voltage.
It can service for both single
Which one of the following is an advantage of three-phase power over single-phase power?
There will be interruption total power.
It only supplies line-to-line single-phase voltage.
It does not have constant level power and high cost
It can supply six separate single phase voltage.
Which one of the following is an advantage of three-phase power over single-phase power?
There will be interruption total power.
It only supplies line-to-line single-phase voltage.
more constant level of power and lower cost
more constant level of power and high cost
What is The equation used to calculate the voltage in a balanced WYE connection?
VL = 1.73xVph
VL = Vph / 1.73
VL = Vph
VL = Vph x P.F
What type of voltage is taken between any two phases?
Phase voltage.
Line voltage
Three phase voltage.
Dc voltage.
What type of voltage are available from three phase generator?
Line voltage and phase voltage
Line current and phase current
Three –phase voltage
voltage and phase voltage and Three –phase voltage
What is The equation used to calculate the current in a balanced Delta connection?
IL = 1.73xVph
IL = Iph / 1.73
IL = 1.73xIph
VL = Vph x P.F
What type of voltage is taken between each phase and neutral?
Phase voltage.
Line voltage
Three phase voltage.
Dc voltage.
In a balanced three phase system, the equation use to calculate total power can be found by:
P = x VL x IL / PF
P = 3 x V x I x sin Ø
P = I x V
P = VL x ILx P.F x 1.73
The star connected source can supply power to_____________
Two separate single -phase supply voltages
Three separate single -phase supply voltages
Five separate single -phase supply voltages
Six separate single phase supply voltages
Refer the figure shown. What type connection of three-phase generator the start of each winding is connected together?
Delta connection
Star(Wye) connection
Delta/wye connection
Parallel connection.
121.
Refer the figure shown. What type connection of three-phase generator the start of a winding (1) is connected to finish of another winding (2)?
Star(Wye) connection
Delta/wye connection
Parallel connection.
Delta connection.
What type of two single-phase voltage are available from three phase System?
two Line voltage and two phase voltage
Line current and phase current
Three –phase voltage
Phase Voltage and Line Voltage.
Refer the figure shown. What type connection of three-phase generator?
Wye connection 3-wire generator with single phase lighting load
Wye connection 4-wire generator with single phase lighting load
Delta connection 3-wire generator with single phase lighting load
Delta connection 4-wire generator with single phase lighting load
Refer the figure shown. What type connection of three-phase generator with motor?
Wye connection of generator with Delta connection of motor
Delta connection of generator with Delta connection of motor
Wye connection of generator with wye connection of motor
Delta connection of generator with Wye connection of motor
Refer to the figure. Calculate the line voltage as shown
120 V
71 V
208 V
336 V
Refer to the figure. Calculate the line Voltage and line Current if Phase current 10 A as shown
240 V
17.3 V
13.7 A
17.3 A
Refer to the figure. Calculate the line Voltage as shown
130 V
71 V
207.6 V
225 V
Refer to the figure. Calculate the line Voltage as shown
120 V
71 V
207.6 V
300 V
Refer to the figure. Calculate the line Current and line voltage as shown
35.5A& 36813 V
35.5 A & 600 V
20.5 A & 36813 v
20.5 A & 600 V
The line voltage in wye connected system is 755 volt .calculate the phase voltage
540 v
1100 v
436 v
755 v
The line voltage in wye connected system is 480 volt .calculate the phase voltage
540 v
1100 v
277 v
755 v
Calculate the three phase power for the circuit with P.F 0.75
, line Voltage is 240 V and line current 10 A
3118 Watt.
31209 Watt
543212 Watt
5114 Watt
Which of the following figures shows the correct connection when measuring power using two-wattmeter method?
Refer to figure .How the Current coils of the wattmeter connected
In parallel between Phase A and B
In opposite polarity
In series to the A & B with phase line conductor
Across the voltage coils
Refer to figure .How the Voltage coils of the wattmeter # 1 connected
In parallel between Phase A and C
In opposite polarity
In series to the A & C with phase line conductor
Across the voltage coils
Refer to figure .What is total measure power in three phase circuit?
Pt = W1 /W2
Pt= W1-W2
Pt= W1+W2
Pt= W1xW2
What is the common term for a fault or abnormal excessive current caused by short-circuit?
problem
inrush current
open circuit
overload
What are the two major concerns when designing and installing a switchgear?
economical and durable
safety and reliability
rugged and simple
non-dependable and robust
Which device use in switchgear to allow the unit to operate safely and prevent you from touching or removing a CB while it is energized?
overload device
disconnect switch
Interlocking
safety switch
What is called for switching unit that can handle large amounts of power, considerably larger than the basic circuit breakers?
Switchgear
Inrush current
Circuit Breaker
Overload
What is the part of the switchgear CB’s that allows you to push the breaker into the compartment easily?
Overload device
Disconnect switch
Interlocking
Rollers
What is used to lift and fit heavy and bulky CB’s into its compartment?
Lifting adaptor
Levers
Forklift
Manual
What is the part of the switchgear CB’s that used to release the Interlocking devices?
Levering device
Inrush current
Circuit Breaker
Rollers
Refer to figure 9 Switchgear Breaker unit parts. What is the Part # 3?
Roller
Sensors
Levering device arm remove position
Secondary disconnecting contacts
Refer to figure 9 Switchgear Breaker unit parts. What is the Part # 4 ?
Roller
Sensors
Levering device arm remove position
Secondary disconnecting contacts
Refer to figure 9 Switchgear Breaker unit parts. What is the Part # 7 ?
Roller
Sensors
Levering device arm remove position
Secondary disconnecting contacts
Refer to figure Switchgear Breaker unit parts. What is the Part # 8 ?
Roller
Sensors
Levering device arm remove position
Secondary disconnecting contacts
Refer to figure Switchgear Breaker unit parts. What is the Part # 2 ?
Roller
Arc chute
Levering device arm remove position
Secondary disconnecting contacts
Refer to figure Switchgear Breaker unit parts. What is the Part # 10?
Roller
Main Disconnecting Contacts
Levering device arm remove position
Secondary disconnecting contacts
What are the reasons of using the metal clad assembly when producing the switchgear?
For environmental protection
Spark containment
Personal protection
All of this
What is use of three-Phase Switch gear?
Reduce Current
Isolate High voltage
Lifting adapter
For environmental protection
