() What is the motor armature current? (a) 99 A (b) 102 A (c) 107 A (d) 110 A (e) 115 A (ii) What is the CEMF developed in the armature? (a) 449.9 V (b) 440.0 V (c) 430.1 V (d) 429.3 V (e) 428.5 V (iii) What is the total windings (copper) losses in the motor? (a) 4842.5 W (b) 4500 1 W (c) 3520 0 W (d) 1145 W (e) 980.1 W 目

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What is the power developed by the armature?
(a) 49.28 kW
(b) 47.08 kW
(iv)
(c) 44.76 kW
(d) 42.58 kW
(e) 41.03 kW
(v)
What is the value of rotational losses for the motor?
(a) 1549 W
(b) 1793 W
(c) 1990 W
(d) 4500 W
(e) 8248 W
(vi)
What is the efficiency of the motor?
(a) 81.09%
(b) 85.60%
(c) 87.15%
(d) 91.26%
(e) 96.36%
(vii)
What is the motor no-load speed if the no load induced voltage is 440.85V?
(а) 390 грm
(b) 395 грm
(c) 400 rpm
(d) 405 rpm
(е) 410 грm
(viii) What would be the starting line current if the motor was started at full-voltage?
(a) 4107 A
(b) 4255 А
(c) 4392 A
(d) 4400 A
(e) 4408 A
(ix)
What is the motor full-voltage starting line current if a 1.90 starting resistor is connected
in series with the armature?
(a) 212 A
(b) 220 A
(c) 228 A
(d) 231.6 A
(e) 239.6 A
1217 words
& Accessibility: Investigate
Transcribed Image Text:What is the power developed by the armature? (a) 49.28 kW (b) 47.08 kW (iv) (c) 44.76 kW (d) 42.58 kW (e) 41.03 kW (v) What is the value of rotational losses for the motor? (a) 1549 W (b) 1793 W (c) 1990 W (d) 4500 W (e) 8248 W (vi) What is the efficiency of the motor? (a) 81.09% (b) 85.60% (c) 87.15% (d) 91.26% (e) 96.36% (vii) What is the motor no-load speed if the no load induced voltage is 440.85V? (а) 390 грm (b) 395 грm (c) 400 rpm (d) 405 rpm (е) 410 грm (viii) What would be the starting line current if the motor was started at full-voltage? (a) 4107 A (b) 4255 А (c) 4392 A (d) 4400 A (e) 4408 A (ix) What is the motor full-voltage starting line current if a 1.90 starting resistor is connected in series with the armature? (a) 212 A (b) 220 A (c) 228 A (d) 231.6 A (e) 239.6 A 1217 words & Accessibility: Investigate
Question 4
A 55 hp, 440 V, 400 rpm DC shunt motor draws 107 A when operating at rated conditions. The
motor has an armature-circuit resistance of 100 m2 and a total field-circuit resistance of 55 2.
Draw a schematic of the motor in the space below showing all known quantities (resistances,
currents, voltages and load). Show only symbols for unknowns.
Determine the following for rated operation
What is the motor armature current?
(a) 99 A
(b) 102 A
(c) 107 A
(d) 110 A
(e) 115 A
(i)
What is the CEMF developed in the armature?
(a) 449.9 V
(b) 440.0 V
(c) 430.1 V
(d) 429.3 V
(e) 428.5 V
(i)
What is the total windings (copper) losses in the motor?
(a) 4842.5 W
(b) 4500.1 W
(c) 3520 0 W
(d) 1145 W
(e) 980.1 W
Transcribed Image Text:Question 4 A 55 hp, 440 V, 400 rpm DC shunt motor draws 107 A when operating at rated conditions. The motor has an armature-circuit resistance of 100 m2 and a total field-circuit resistance of 55 2. Draw a schematic of the motor in the space below showing all known quantities (resistances, currents, voltages and load). Show only symbols for unknowns. Determine the following for rated operation What is the motor armature current? (a) 99 A (b) 102 A (c) 107 A (d) 110 A (e) 115 A (i) What is the CEMF developed in the armature? (a) 449.9 V (b) 440.0 V (c) 430.1 V (d) 429.3 V (e) 428.5 V (i) What is the total windings (copper) losses in the motor? (a) 4842.5 W (b) 4500.1 W (c) 3520 0 W (d) 1145 W (e) 980.1 W
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