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The DC motor which can provide zero speed regulation at full load without any controller is
(A) Series
(B) Shunt
(C) Cumulative Compound
(D) Differential Compound

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The transistor Q1 has a current gain β1 = 99 and the transistor Q2 has a current gain β2 = 49.The current IB2 in microampere is _______.

The diode used in the circuit has a fixed voltage drop of 0.6 V when forward biased. A signal vs is given to the ideal OpAmp as shown. When vs is at its positive peak, the output (vOA) of the OpAmp in volts is _______.

In a variable frequency induction motor drive, the voltage must be varied ___________ to the frequency.

A six pole 50 Hz induction motor rotating at 1400 rpm is in __________ mode.

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In a variable frequency induction motor drive, the voltage must be varied ___________ to the frequency.

A six pole 50 Hz induction motor rotating at 1400 rpm is in __________ mode.

A DC shunt motor runs at 600 rpm from a 240 V supply. Its armature has a resistance of 0.5 ohm and draws 30 amp. If an external resistance of 2.5 ohm is connected in series with the armature while there is no change in armature or field current, the new speed is
(a) 400 rpm (b) 800 rpm (c) 600 rpm (d) 200 rpm

A DC shunt motor runs at 600 rpm from a 240 V supply. Its armature has a resistance of 0.5 ohm and draws 30 amp. If an external resistance of 2.5 ohm is connected in series with the armature while there is no change in armature or field current, the new speed is
(a) 400 rpm (b) 800 rpm (c) 600 rpm (d) 200 rpm