1
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
The armature resistance of a permanent magnet dc motor is 0.8 $$\Omega$$. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A form the same source will be
A
48.0%
B
57.1%
C
59.2%
D
88.8%
2
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
A 8 pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is
A
96V
B
192V
C
384V
D
768V
3
GATE EE 2003
MCQ (Single Correct Answer)
+2
-0.6
A dc series motor driving an electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to
A
0.75 p.u.
B
0.5 p.u.
C
0.25 p.u.
D
0.125 p.u.
4
GATE EE 2002
MCQ (Single Correct Answer)
+2
-0.6
A 200 V, 2000 rpm, 10A, separately excited d.c. motor has an armature resistance of 2 $$\Omega$$. Rated d.c. voltage is applied to both the armature and field winding of the motor. If the armature drawn 5A from the source, the torque developed by the motor is
A
4.30 Nm
B
4.77 Nm
C
0.45 Nm
D
0.50 Nm
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
CBSE
Class 12