1
GATE EE 2005
MCQ (Single Correct Answer)
+2
-0.6
The simultaneous application of signals $$x(t)$$ and $$y(t)$$ to the horizontal and vertical plates, respectively, of an oscilloscope, produces a vertical figure-of-$$8$$ display. If $$P$$ and $$Q$$ are constants, and $$x(t)=P$$ $$sin(4t+30),$$ then $$y(t)$$ is equal to
A
$$Q\,\sin \left( {4t - 30} \right)$$
B
$$Q\,\sin \left( {2t + 15} \right)$$
C
$$Q\,\sin \left( {8t + 60} \right)$$
D
$$Q\,\sin \left( {4t + 30} \right)$$
2
GATE EE 2005
MCQ (Single Correct Answer)
+1
-0.3
A digital-to-analog converter with a full scale output voltage of $$3.5V$$ has resolution close to $$14mV.$$ It's bit size is _____.
A
$$4$$
B
$$8$$
C
$$16$$
D
$$32$$
3
GATE EE 2005
MCQ (Single Correct Answer)
+2
-0.6
Two magnetic poles revolve around a stationary armature carrying two coils ($$c_1-c'_1$$ , $$c_2-c'_2$$ ) as shown in Figure. Consider the instant when the poles are in a position as shown. Identify the correct statement regarding the polarity of the induced emf at this instant in coil sides $$c_2$$ and $$c_1$$. GATE EE 2005 Electrical Machines - D.C Machines Question 56 English
A
$$\odot\;in\;c_1$$, no emf in c2
B
$$\otimes\;in\;c_1$$, no emf in c2
C
$$\odot\;in\;c_2$$, no emf in c1
D
$$\otimes\;in\;c_2$$, no emf in c1
4
GATE EE 2005
MCQ (Single Correct Answer)
+2
-0.6
A 50 kW dc shunt motor is loaded to draw rated armature current at any given speed. When driven
(i) at half the rated speed by armature voltage control and
(ii) at 1.5 times the rated speed by field control, the respective output powers delivered by the motor are approximately
A
25 kW in (i) and 75 kW in (ii)
B
25 kW in (i) and 50 kW in (ii)
C
50 kW in (i) and 75 kW in (ii)
D
50 kW in (i) and 50 kW in (ii)
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