BSNL LDCE TTA Exam

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BSNL LDCE TTA Exam question

1. The power consumption in a 3 phase Delta connection is
A. More than Star connection
B. Less than Star connection
C. Remain unchanged

2. In a 3Phase Delta connection the line current is
A.√3 times the Phase current
B. 3 times the Phase Current
C. Both line and phase currents are similar.
D. Less than the phase current as there is no 4th wire neutral.

3 A 4 wire poly phase connection is termed as
A.A Delta to Star connection
B. A Star to Delta connection
C. A Delta connection with phase angle 120 degrees
D. A Star connection with phase angle 120 degrees

4 The line voltage in a 4 wire star connection is 415 v. what would be its phase voltage?
A. 240 V approximately.
B. 215 V approximately.
C. 315 V approximately.
D. 400 V approximately.

5. The equation for calculation of 3 phase power supply in case of Star Delta connections.
A. VL x IL x cos Φ watts
B.√3 V ph x I ph x cos Φ watts
C. both A&B
D. V x I KW

6. Two inductances L1and L2 are connected in parallel. The equivalent Inductance L=
A. L1 x L2 / L1 +L2 Henries
B L1 x L2 Henries
C L1 +L2 Henries
D L1 +L2 /L1 x L2 Henries

BSNL LDCE TTA Exam question

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