AFCAT-EKT EE: Quiz 13

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Question 1

The commutator segments of d.c. machine are made of

• Atungsten
• Bhard-drawn copper
• Csoft copper
• Delectrolytic copper

Question 2

A rise in temperature is observed in a conductor by passing a current. When the current is doubled, the rise in temperature will be

• A
• B
• C
• D

Question 3

An under-excited synchronous motor behaves as …………….

• Aan inductor
• Ba capacitor
• Ca resistor
• Dnone of the above

Question 4

A 50 Hz, 11 kV, 3-phase alternator with earthed neutral has a reactance of 5 ohms per phase and is connected to a bus-bar through a circuit breaker. The distributed capacitance upto circuit breaker between phase and neutral is 0.01, the frequency of oscillations is

• A11652 Hz
• B1058 Hz
• C12628 Hz
• D15225 Hz

Question 5

The minority of carrier concentration is largely a function of ___________.

• Athe amount of doping
• Btemperature
• Cforward biasing voltage
• Dreverse biasing voltage

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