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TSGENCO Practice Quiz 9

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Question 1

In a common emitter transistor, the current gain is 80. What is the change in collector current when the change in base current is

Question 2

The α-rating and β-rating of a transistor are related as :

Question 3

When

transistor is used as an amplifier, then,

Question 4

The current gain of a transistor in common base mode is 0.99. To change the emitter current by 5 mA, the necessary change in collector current is

Question 5

The area enclosed by a circular coil of 200 turns is 10 cm2. Its plane is kept perpendicular to a magnetic field of 0.3 Wb/m2 and is rotated through 180 °. What is the change in magnetic flux?

Question 6

A circuit has a self-inductance of I H and carries a current of 2A. To prevent sparking when the circuit is broken, a capacitor which can withstand 400 V is used. The capacitance of the capacitor is

Question 7

A 230 V, 50 Hz single-phase energy meter has a load current of 10 A at p.f. of 0.8 lagging. The energy consumed by the load in 2 minutes is 0.06 kWh. If the disc makes 72 revolutions for 2 minutes, what is the meter constant?

Question 8

In a potentiometer experiment, it is found that no current flows through the galvanometer when the terminals of the cell are connected across 52 cm of potentiometer wire. If the cell is shunted by a resistance of

the balance point is found at 40 cm of the wire from the same end. The internal resistance of the cell is