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ECAT Pre General Science Physics Chapter 16 Alternating Current
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Total Questions30
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Time Allowed30
ECAT Pre General Science Physics Chapter 16 Alternating Current
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Question # 1
The length of rotating vector (on a certain scale) represents the:
Question # 2
Which of the following diodes can operate in the reverse biased condition
Question # 3
In a transistor, the central region is called
Question # 4
Which of the following diode is used to derive the current in external circuit when light is incident in the circuit
Question # 5
The basic circuit element in D.C. circuit is:
Question # 6
In an A.C circuit with resistor only, the current and voltage have a phase angle of
Question # 7
A sinusoidally alternating voltage or current can be graphically represented by a:
Question # 8
The closed loop gain of the non-inverting amplifier is given by
Question # 9
When the pn-junction is connected reversed biased, its resistance is of the order of
Question # 10
SI unit of impedance is
Question # 11
During the negative half-cycle of the half-wave rectification, the diode
Question # 12
Nowadays, Most of the electric energy is produced by the A.C. generators using:
Question # 13
In describing functions of digital systems, a closed switch will be shown as
Question # 14
The average of A.C. current and voltage over a complete cycle is
Question # 15
At resonance, the impedance of RLC series circuit is
Question # 16
The r.m.s. value of alternating current is equal to its maximum value at angle of
Question # 17
When the p-n junction is forward biased its resistance is of the order of
Question # 18
OP-AMP has the following input terminals
Question # 19
Conversion of alternating current into direct current is called
Question # 20
At higher frequency of the alternating current, the capacitive reactance Xc
Question # 21
During each cycle, alternating voltage reaches a peak value
Question # 22
The device which allows only the flow of an A.C. through a circuit is
Question # 23
If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
Question # 24
A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at
Question # 25
The impedance of RLC series resonance circuit at resonant frequency is
Question # 26
The phase at the positive peak of an A.C. cycle is:
Question # 27
In which of the following components, pn-junction is used
Question # 28
The value of current gain of n-p-n transistor is of the order of
Question # 29
A P-N juction or semiconductor diode cannot be used as
Question # 30
In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.
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