1
GATE EE 2011
MCQ (Single Correct Answer)
+1
-0.3
A dual trace oscilloscope is set to operate in the ALTernate. The control input of the multiplexer used in the y-circuit is fed with a signal having a frequency equal to
A
the highest frequency that the multiplexer can operate properly
B
twice the frequency of the time base (sweep) oscillator
C
the frequency of the time base (sweep) oscillator
D
half the frequency of the time base (sweep) oscillator
2
GATE EE 2011
MCQ (Single Correct Answer)
+2
-0.6
A $$4\,{1 \over 2}$$ digit $$DMM$$ has the error specification as $$0.2$$% of reading $$+10$$ counts. If a dc voltage of $$100$$ $$v$$ is read on its $$200$$ $$V$$ full scale. The maximum error that can be expressed in the reading is _______.
A
$$ \pm \,\,0.1\% $$
B
$$ \pm \,\,0.2\% $$
C
$$ \pm \,\,0.3\% $$
D
$$ \pm \,\,0.4\% $$
3
GATE EE 2011
MCQ (Single Correct Answer)
+1
-0.3
A 4–point starter is used to start and control the speed of a
A
dc shunt motor with armature resistance control
B
dc shunt motor with field weakening control
C
dc series motor
D
dc compound motor
4
GATE EE 2011
MCQ (Single Correct Answer)
+2
-0.6
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 $$\Omega$$ and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be
A
1.79 $$\Omega$$
B
2.1 $$\Omega$$
C
3.1 $$\Omega$$
D
18.9 $$\Omega$$
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