Multiple Choices Ujian Diklat ATT-II Kelistrikan Kapal
1. An inductance of 0.15 h is connected serie with a resistance of 10 Ω, and capacitor 120 МҒ, determine the magnitude of the inductance reactance
a. 45.3 Ohm
b. 47.1 Ohm ✔️
c. 38.6 Ohm
d. 37.6 Ohm
e. All wrong
Answer: b
2. An inductance of 0.15 h is connected serie with a resistance of 10 Ω, and a capacitor of 120 МҒ, determine the magnitude of the cotton reactance
a. 24.3 Ohm
b. 25.4 Ohm
c. 30.6 Ohm
d. 26.5 Ohm✔️
e. All wrong
Answer: d
3. An inductance of 0.15 h is connected serie with a resistance of 10 Ω, and capacitor 120 МҒ, find the apedance of R, L, C in serie
a. Z = 22.4
b. Z = 3
c. Z = 22.9 Ohm✔️
d. Z = 3.1 Ohm
e. All wrong
Answer: c
4. An inductance of 0.15 h is connected serie with a resistance of 10 Ω, and a capacitor of 120 МҒ, find the current of the serie relations R, L and C:
a. Is = 3.3 Amp
b. Is = 3.37 Amp✔️
c. Is = 3.36 Amp
d. Is = 3.4 Amp
e. All wrong
Answer: b
5. An inductance of 0.15 h is connected serie with a resistance of 10 Ω, and capacitor 120 МҒ, specify the phase angle of the circuit:
a. φ = 64.1°✔️
b. φ = 64, °
c. φ = 65°
d. φ = 63°
e. All wrong
Answer: a
6. An inductance of 0.15 h is connected serie with a resistance of 10 Ω, and capacitor 120 МҒ, find the circuit power factor (cos φ)
a. 0.43
b. 0.438
c. 0.44
d. 0.436✔️
e. All wrong
Answer: d
7. An inductance of 0.15 h is connected serie with a resistance of 10 Ω, and a capacitor of 120 МҒ, determine the absorbed pure power
a. 148.3
b. 148.28✔️
c. 148
d. 147
e. All wrong
Answer: b
8. A 3 Phase 440 Volt, 60 Hz power grid has a low power factor under load conditions: a). Lighting load = 400 Kw; PF Unity
b). Sea water Pump = 600 Kw; PF 0.76 Lagging
How your efforts for network power factor reach 0.9 Lagging
a. Installing Capacitor bank in Serie
b. Installing a bank Capacitor in Star relationship
c. Installing the bank Capacitor in Delta relationship✔️
d. Installing a bank Capacitor in Parallel relationship
e. Everything is correct
Answer: c
9. A 3 Phase 440 Volt, 60 Hz power grid has a low power factor under load conditions: a). Lighting load = 400 Kw; PF Unity
b). Sea water Pump = 600 Kw; PF 0.76 Lagging
Determine the value of tg φ sea water pump
a. 0.387
b. 0.848
c. 0.75
d. 0.86✔️
e. Everything is correct
Answer: d
10. A 3 Phase 440 Volt, 60 Hz electricity network has a low power factor under load
conditions:
a). Lighting load = 400 Kw; PF Unity
b). Sea water Pump = 600 Kw; PF 0.76 Lagging
Determine how much power the entire network reactances
a. 484
b. 516✔️
c. - 32
d. 120
e. Everything is correct
Answer: b
11. A 3 Phase 440 Volt, 60 Hz power grid has a low power factor under load conditions: a).
Lighting load = 400 Kw; PF Unity
b). Sea water Pump = 600 Kw; PF 0.76 Lagging
Determine the large amount of pure power throughout the network
a. 1000✔️
b. 200
c. 1200
d. 800
e. Everything is correct
Answer: a
12. A 3 Phase 440 Volt, 60 Hz power grid has a low power factor under load conditions:
a). Lighting load = 400 Kw; PF Unity
b). Sea water Pump = 600 Kw; PF 0.76 Lagging
Improved PF network expected 0.9 Logging specify value
a. 0.387
b. 0.848 ✔️
c. 0.75
d. 0.86
e. Everything is correct
Answer: b
13. Electric network 3 Phase 440 Volt, 60 Hz, has a load condition of 1000 KW, with tg φ = 0.484, determine the amount of power rektansi network:
a. 484 KVAR✔️
b. 516 KVAR
c. - 32 KVAR
d. 120 KVAR
e. Everything is correct
Answer: a
14. Network reactance power of 516 KVAR, improved network power factor is expected to be 0.9 Lagging, calculated network reactance to 484 KVAR, determine the value of KVAR that must be disposed:
a. 32 KVAR
b. 120 KVAR
c. -32 KVAR✔️
d. 90 KVAR
e. All wrong
Answer: c
15. Improvement of electric power factor power generates KVAR value which must be
disposed of as negative as 32 KVAR, network work voltage, 440 Volt, 3 Phase, ƒ = 60 Hz, find the value of cotton reactance with assumption of selected capacitor bank in delta relation:
a. 21 Ohm
b. 19 Ohm
c. 18.15 Ohm
d. 15.15 Ohm✔️
e. All wrong
Answer: d
16. The value of Xc after the cos φ improvement of a network is, 18.15 Ohm, working at a voltage of 440 Volts, 3 Phases, 60 Hz, determine the value of the capacitor to be installed in the delta:
a. 1.46147 10-⁴ Farrad
b. 146,147 10-6 Farrad
c. 146 Micro Farrad✔️
d. 148 Micro Farrad
e. 222 micro Farrad
Answer: c
17. A high-voltage power plant of 3.3 KV, f: 50 Hz, p: 2 Polishing. Bearing the motor load 3 Phase connect delta 10,000 KV, 50 Pole, Cosφ = 0.94 Lagging, Rendemen 92% round
110 rpm. Determine the alternator mesh current
a. 2023,064 Amp
b. 1168,016 Amp
c. 1861,219 Amp✔️
d. 1071,579 Amp
e. 1010,551 Amp
Answer: c
18. Alternator of star 3.3 KV, 50Hz, bear the load of High voltage motor with assumption of current of 1861 Amp. Determine the flow of Phase Alternator:
a. 2023
b. 1074.6
c. 1071.6
d. 1861✔️
e. 1888
Answer: d
19. An induction motor High Voltage 3.3 KV delta connections draws a net current of 1861 Amperes. Determine the value of the phase current:
a. 2023
b. 1074.6✔️
c. 1071.6
d. 1861
e. 1888
Answer: b
20. Alternator high voltage 3.3 KV, 60 Hz, bear the load of High Voltage motor connecting delta 10,000 Kw, Pk = 0.94 Logging, η = 0.92 rpm, how many KVA Alternator outputs?
a. 10,000
b. 10638.298
c. 9787,234✔️
d. 9400.234
e. All wrong
Answer: c
21. An induction motor High voltage, Delta link, 10,000 Kw, 50 Pole, got voltage 3.3 Kv, 3 Phase ƒ = 50 Hz, power Factor 0.94 Logging Rendement 92 persent. Determine pseudo
power output:
a. 10,000 KVA
b. 10638.29 KVA
c. 9787.234 KVA✔️
d. 9400.234 KVA
e. All wrong
Answer: c
22. High Voltage induction motor connecting delta, 50 poles. Having a 110 rpm rotation, connected to a voltage of 3.3 KV, 3 Phase, cos φ = 0.94, determine the system Frequency at full load:
a. 50 Cps
b. 45.83 Cps
c. 51 Cps
d. 46 Cps ✔️
e. Everything is correct
Answer: d
23. Load Group 3 Phase Burden A Delta link consists of:
- Impedance = 15 Ohm.
- Power Factor = 0.65 Lagging.
The load is installed at a voltage of 380 Volts, 50 Hz. Determine the net current:
a. 23.33 Amp
b. 25.3 Amp
c. 43.88 Amp ✔️
d. 40.41 Amp
e. All wrong
Answer: c
24. Load Group 3 Phase Burden A Delta link consists of:
- Impedance = 15 Ohm.
- Power Factor = 0.65 Lagging.
The load is installed at a voltage of 380 Volts, 50 Hz. Determine the Phase angle of load group A:
a. 50 °
b. 49 °✔️
c. 40 °
d. 51 °
e. All wrong
Answer: b
25. Another group of 3 Phase loads, the load B in the Star connection consists of Impedance (12 + J 15), the load is mounted at a mesh voltage of 380 Volts, 50 Hz. Determine the value of Zb:
a. 19 Ohm
b. 20 Ohm
c. 19.21 Ohm✔️
d. 18.9 Ohm
e. All wrong
Answer: c
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