1
GATE EE 2010
MCQ (Single Correct Answer)
+2
-0.6
A separately excited DC motor runs at 1500 rpm under no-load with 200 V applied to the armature. The field voltage is maintained at its rated value. The speed of the motor, when it delivers a torque of 5 Nm, is 1400 rpm as shown in the figure. The rotational losses and armature reaction are neglected. GATE EE 2010 Electrical Machines - D.C Machines Question 36 English For the motor to deliver a torque of 2.5 Nm at 1400 rpm the armature voltage to be applied is
A
125.5 V
B
193.3 V
C
200 V
D
241.7 V
2
GATE EE 2010
MCQ (Single Correct Answer)
+2
-0.6
A separately excited DC motor runs at 1500 rpm under no-load with 200 V applied to the armature. The field voltage is maintained at its rated value. The speed of the motor, when it delivers a torque of 5 Nm, is 1400 rpm as shown in the figure. The rotational losses and armature reaction are neglected. GATE EE 2010 Electrical Machines - D.C Machines Question 37 English The armature resistance of the motor is,
A
$$2\;\Omega$$
B
$$3.4\;\Omega$$
C
$$4.4\;\Omega$$
D
$$7.7\;\Omega$$
3
GATE EE 2010
MCQ (Single Correct Answer)
+1
-0.3
A single-phase transformer has a turns ratio of 1:2, and is connected to a purely resistive load as shown in the figure. The magnetizing current drawn is 1 A, and the secondary current is 1 A. If core losses and leakage reactances are neglected, the primary current is GATE EE 2010 Electrical Machines - Transformers Question 82 English
A
1.41 A
B
2 A
C
2.24 A
D
3 A
4
GATE EE 2010
MCQ (Single Correct Answer)
+2
-0.6
A balanced star-connected and purely resistive load is connected at the secondary of a star-delta transformer as shown in the figure. The line-to-line voltage rating of the transformer is 110 V/220 V. Neglecting the non-idealities of the transformer, the impedance 'Z' of the equivalent star-connected load, referred to the primary side of the transformer, is GATE EE 2010 Electrical Machines - Transformers Question 56 English
A
(3 + j0) Ω
B
(0.866 − j0.5) Ω
C
(0.866 + j0.5) Ω
D
(1 + j0) Ω
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