1
GATE EE 2000
+2
-0.6
A 240 V dc series motor takes 40A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is:
A
6 ohms
B
5.7 ohms
C
2.2 ohms
D
1.9 ohms
2
GATE EE 2000
+2
-0.6
A permanent magnet dc commutator motor has a no load speed of 6000 rpm when connected to a 120V dc supply. The armature resistance is 2.5 ohms and other losses may be neglected. The speed of the motor with supply voltage of 60V developing a torque 0.5 Nm, is:
A
3000 rpm
B
2673 rpm
C
2836 rpm
D
5346 rpm
3
GATE EE 1999
+2
-0.6
A DC shunt motor is running at 1200 rmp, when excited with 220 V DC. Neglecting the losses and saturation, the speed of the motor when connected to a 175 V DC supply is:
A
750 RPM
B
900 RPM
C
1050 RPM
D
1200 RPM
4
GATE EE 1998
+2
-0.6
A 240 V d.c. shunt motor with an armature resistance of 0.5 $$\Omega$$ has a full load current of 40 A. Find the ratio of the stalling torque to the full load torque when a resistance of 1 $$\Omega$$ is connected in series with the armature?
A
4
B
12
C
6
D
None of the above
EXAM MAP
Medical
NEET