GATE EE 2005 | GATE EE Year Wise Previous Years Questions

GATE EE 2005

MCQ (Single Correct Answer)

-0.6

Assertion [a]: Under V/f control of induction motor, the maximum value of the developed torque remains constant over a wide range of speed in the subsynchronous region.

Reason [r]: The magnetic flux is maintained almost constant at the rated value by keeping the ratio V/f constant over the considered speed range.

Both [a] and [r] are true and [r] is the correct reason for [a]

Both [a] and [r] are true but [r] is not the correct reason for [a]

Both [a] and [r] are false

[a] is true but [r] is false

GATE EE 2005

MCQ (Single Correct Answer)

-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

Star - Star

Star - Delta

Delta - Delta

Delta - Zigzag

GATE EE 2005

MCQ (Single Correct Answer)

-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

$$\begin{array}{l}P\;\;\;\;Q\;\;\;\;R\\3\;\;\;\;\;3\;\;\;\;\;1\end{array}$$

$$\begin{array}{l}P\;\;\;\;Q\;\;\;\;R\\2\;\;\;\;\;5\;\;\;\;\;4\end{array}$$

$$\begin{array}{l}P\;\;\;\;Q\;\;\;\;R\\3\;\;\;\;\;5\;\;\;\;\;4\end{array}$$

$$\begin{array}{l}P\;\;\;\;Q\;\;\;\;R\\2\;\;\;\;\;3\;\;\;\;\;1\end{array}$$

GATE EE 2005

MCQ (Single Correct Answer)

-0.3

For an induction motor, operating at a slip 's', the ratio of gross power output to air gap power is equal to:

$$\left(1-s\right)^2$$

$$\left(1-s\right)$$

$$\sqrt{\left(1-s\right)}$$

$$\left(1-\sqrt s\right)$$

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