1
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)
2
GATE EE 2005
MCQ (Single Correct Answer)
+2
-0.6
In relation to DC machines, match the following and choose the correct combination.

Group-I(Performance variables)
(P) Armature emf (E)
(Q) Developed torque (T)
(R) Developed power (P)

Group-II(Proportional to)
1.Flux ($$\phi$$), speed ($$\omega$$) and armature current ($$I_a$$)
2.$$\phi$$ and $$\omega$$ only
3.$$\phi$$ and $$I_a$$ only
4.$$I_a$$ and $$\omega$$ only
5.$$I_a$$ only

A
$$\begin{array}{l}P\;\;\;\;Q\;\;\;\;R\\3\;\;\;\;\;3\;\;\;\;\;1\end{array}$$
B
$$\begin{array}{l}P\;\;\;\;Q\;\;\;\;R\\2\;\;\;\;\;5\;\;\;\;\;4\end{array}$$
C
$$\begin{array}{l}P\;\;\;\;Q\;\;\;\;R\\3\;\;\;\;\;5\;\;\;\;\;4\end{array}$$
D
$$\begin{array}{l}P\;\;\;\;Q\;\;\;\;R\\2\;\;\;\;\;3\;\;\;\;\;1\end{array}$$
3
GATE EE 2005
MCQ (Single Correct Answer)
+1
-0.3
Which three-phase connection can be used in a transformer to introduce a phase difference of 30° between its output and corresponding input line voltages
A
Star - Star
B
Star - Delta
C
Delta - Delta
D
Delta - Zigzag
4
GATE EE 2005
MCQ (Single Correct Answer)
+1
-0.3
On the torque/speed curve of induction motor shown in Fig, four points of operation are market as W, X, Y and Z. Which one of them represents the operation at a slip greater than 1? GATE EE 2005 Electrical Machines - Induction Machines Question 63 English
A
W
B
X
C
Y
D
Z
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