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Electrical Machines
Induction Machines
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D.C Machines
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Synchronous Machines
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Transformers
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1
GATE EE 2003
MCQ (Single Correct Answer)
+1
-0.3
Group I lists different applications and Group II lists the motors for these applications. Match the application with the most suitable motor and choose the right combination among the choices given there after:

Group I
P. Food mixer
Q. Cassette tape recorder
R. Domestic water pump
S. Escalator

Group II
1. Permanent magnet dc motor
2. Single phase induction motor
3. Universal motor
4. Three phase induction motor
5. DC series motor
6. Stepper motor

A
$$\begin{array}{l}P\;\;\;Q\;\;\;R\;\;\;S\\3\;\;\;\;6\;\;\;\;4\;\;\;\;5\\\end{array}$$
B
$$\begin{array}{l}P\;\;\;Q\;\;\;R\;\;\;S\\1\;\;\;\;3\;\;\;\;2\;\;\;\;4\\\end{array}$$
C
$$\begin{array}{l}P\;\;\;Q\;\;\;R\;\;\;S\\3\;\;\;\;1\;\;\;\;2\;\;\;\;4\\\end{array}$$
D
$$\begin{array}{l}P\;\;\;Q\;\;\;R\;\;\;S\\3\;\;\;\;2\;\;\;\;1\;\;\;\;4\\\end{array}$$
2
GATE EE 2002
MCQ (Single Correct Answer)
+1
-0.3
If a 400 V, 50 Hz, star connected, 3 phase squirrel cage induction motor is operated from a 400 V, 75 Hz supply, the torque that the motor can now provide while drawing rated current from the supply?
A
reduces
B
increases
C
remains the same
D
increase or reduces depending upon the rotor resistance
3
GATE EE 1999
MCQ (Single Correct Answer)
+1
-0.3
Starting torque can be obtained in the case of a single phase induction motor with identical main and auxiliary windings by connecting
A
a capacitor across the mains
B
a capacitor in series with the machine
C
a capacitor in series with the auxiliary winding
D
the main and the auxiliary windings in series
4
GATE EE 1999
MCQ (Single Correct Answer)
+1
-0.3
The following starting method for an induction motor is inferior view of the poor starting torque per ampere of the line current drawn:
A
Direct line starting
B
Auto transformer method of starting
C
Series inductor method of starting
D
Star-Delta method of starting
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Questions Asked from Marks 1
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GATE EE Subjects
Electromagnetic Fields
Signals and Systems
Engineering Mathematics
General Aptitude
Power Electronics
Power System Analysis
Analog Electronics
Control Systems
Digital Electronics
Electrical Machines
Electric Circuits
Electrical and Electronics Measurement