A13 The back e.m.fof a d.c. motor is V-la Ra. (TRUE/FALSE)

Quèstion 8 The speed regulation of DC series motor is lesser than the DC shunt motor True False a ENG 4) hp 8米 & 7 %23 3 4 T w E %24

[3] c) What is coefficient of adhesion? Why a train driven by separately excited motors have a better adhesion than a train driven by series motor? 19 quilved-1570 on incline

200V d.c shunt moter takes 4A at no-Load when ab F00 rap-m. The field Yesistance is 100.2.The resistance of the armature Yuning at stand still gives adrop of 6 Volt a crass armature terminals when t0 A were passed through it Calculate (i) the speed, on load (i) the amature Čii) efficiency torque The normal imput of motor is 8 kwe

Q2\ A d.c. shunt motor runs at a speed of 1000 r.p.m on no load ,taking a current of 6 A from the supply ,when connected to 220V d.c. supply. Its full load current is 50 A calculate its speed on full load . Assume R, = 0.3 2, R= 110 Q.

ANSWERE FAST PLEASE QUESTION from book ELECTRIC MACHINE-1  LAB BASESD QUESTION i. A variable resistive load of (0-1K) ohm is connected across the DC shunt motor. What willbe the load characteristics in this case? What will be the effect of N on torque? Given thefollowing table of observations. ii. If the same load is connected across the DC shunt generator, what will be the difference.Explain using drawing.

Q4 A 440 V shunt motor has armature resistance of 0.8 2 and field resistance of 200 2. Determine the back e.m.f. when giving an output of 7.46 KW at 85% efficiency. Q5 A 20 KW, 250 V d.c. shunt generator has armature and field resistance of 0.1 Q and 125 2 respectively. Calculate the total armature power developed when running i) as a generator delivering 20 KW output (ii) as a motor taking 20 KW input.

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Subject = Electric Machines