Question 1

In a balanced three-phase star-connected system which has three loads, each of
Resistance 100 Ω, and a line voltage of 440 V the line current is:

Accepted Answer

A)  7.60 A 
B)  4.40 A 
C)  2.54 A 
D)  1.27 A 
A)  7.60 A 
B)  4.40 A 
C)  2.54 A 
D)  1.27 A C

Question 2

In a balanced three-phase delta-connected system which has three loads, each of resistance 100 Ω, and a line voltage of 440 V the line current is:

Accepted Answer

A)  7.60 A 
B)  4.40 A 
C)  2.54 A 
D)  1.27 A 
A)  7.60 A 
B)  4.40 A 
C)  2.54 A 
D)  1.27 A A

Question 3

Decide whether each of these statements is True (T) or False
For a balanced three-phase supply, for the same power:
(i) Loads connected in a delta form have a higher line voltage than star-connected systems.
(ii) Loads connected in a delta form have a smaller line current than star-connected systems.

Accepted Answer

A)  (i) T (ii) T 
B)  (i) T (ii) F 
C)  (i) F (ii) T 
D)  (i) F (ii) F 
A)  (i) T (ii) T 
B)  (i) T (ii) F 
C)  (i) F (ii) T 
D)  (i) F (ii) F D

Question 4

In a balanced three-phase star-connected system which has three loads, each of
Resistance 100 Ω, and a line voltage of 440 V the phase voltage is:

Accepted Answer

A)  762 V 
B)  440 V 
C)  311 V 
D)  254 V 
A)  762 V 
B)  440 V 
C)  311 V 
D)  254 V

Question 5

In a balanced three-phase delta-connected system which has three loads, each of resistance 100 Ω, and a line voltage of 440 V the phase voltage is:

Accepted Answer

A)  762 V 
B)  440 V 
C)  311 V 
D)  254 V 
A)  762 V 
B)  440 V 
C)  311 V 
D)  254 V

In a balanced three-phase star-connected system which has three loads, each of Resistance 100 Ω, and a line voltage of 440 V the line current is:

In a balanced three-phase delta-connected system which has three loads, each of resistance 100 Ω, and a line voltage of 440 V the line current is:

In a balanced three-phase star-connected system which has three loads, each of Resistance 100 Ω, and a line voltage of 440 V the phase voltage is:

In a balanced three-phase delta-connected system which has three loads, each of resistance 100 Ω, and a line voltage of 440 V the phase voltage is:

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Exam 10: Three-Phase A.C

In a balanced three-phase star-connected system which has three loads, each of Resistance 100 Ω, and a line voltage of 440 V the line current is:

In a balanced three-phase delta-connected system which has three loads, each of resistance 100 Ω, and a line voltage of 440 V the line current is:

In a balanced three-phase star-connected system which has three loads, each of Resistance 100 Ω, and a line voltage of 440 V the phase voltage is:

In a balanced three-phase delta-connected system which has three loads, each of resistance 100 Ω, and a line voltage of 440 V the phase voltage is:

Basics, and Statics

Linear Motion, and Stress and Strain

Angular Motion

Dynamics, and Energy

Heat, and D.C Circuits

Capacitance, and Magnetic Flux

Alternating Current, and Series A.C Circuits

Transients, D.C Circuit Analysis, and D.C Machines

Parallel A.C Circuits

Circular Motion, Component, and Structures

Mechanical Power Transmission

Structural Members

Frictional Resistance

Angular Dynamics

Oscillations

Filters