1
GATE EE 2007
MCQ (Single Correct Answer)
+1
-0.3
The probes of a non $$-$$ isolated, two-channel oscilloscope are clipped to points $$A, B, $$ and $$C$$ in the circuit of the adjacent fig. $${V_{in}}$$ is a square wave of a suitable low frequency. The display on $$c{h_1}$$ and $$c{h_2}$$ are as shown on the right. Then the ''signal'' and ''Ground'' probes $${S_1},\,\,{G_1}$$ and $${S_2},\,\,{G_2}$$ of $$c{h_1}$$ and $$c{h_2}$$ respectively are connected to points. GATE EE 2007 Electrical and Electronics Measurement - Cathode Ray Oscilloscope Question 3 English
A
$$A, B, C, A$$
B
$$A, B, C, B$$
C
$$C, B, A, B$$
D
$$B, A, B, C$$
2
GATE EE 2007
MCQ (Single Correct Answer)
+2
-0.6
A three phase squirrel cage induction motor has a starting current of seven times the full load current and full load slip of $$5\% $$

If an auto-transformer is used for reduced voltage starting to provide $$1.5$$ per unit starting torque, the auto-transformer ratio $$\left( \% \right)$$ should be

A
$$57.77\% $$
B
$$72.56\% $$
C
$$78.25\% $$
D
$$81.33\% $$
3
GATE EE 2007
MCQ (Single Correct Answer)
+2
-0.6
A three-phase squirrel cage induction motor has a starting torque of $$150\% $$ and a maximum torque of $$300\% $$ with respect to rated torque at rated voltage and rated frequency. Neglect the stator resistance and rotational losses. The value of slip for maximum torque is
A
$$13.48\% $$
B
$$16.42\% $$
C
$$18.92\% $$
D
$$26.79\% $$
4
GATE EE 2007
MCQ (Single Correct Answer)
+2
-0.6
A three phase squirrel cage induction motor has a starting current of seven times the full load current and full load slip of $$5\% $$

If a star-delta starter is used to start this induction motor, the per unit staring torque will be

A
$$0.607$$
B
$$0.816$$
C
$$1.225$$
D
$$1.616$$
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