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Home » GAT Subject » Computer Science » Aptitude Test - 113
1.In a transistor operates at the middle of the load line, an increase in the base resistance will move the Q point
A. down
B. up
C. nowhere
D. down
2.Voltage is
A. The flow of charged particles through a material
B. The smallest electrically charged particle
C. Trie force that causes electrons to flow
D. The flow of charged particles through a material
3.What is the turns ratio for the transformer specified in the above question?
A. 10.738
B. 0.707
C. 1.5
D. 10.738
4.The total impedance of a series RLC circuit:
A. is minimum at the resonant frequency
B. always increases as the applied frequency increases
C. always decreases as the applied frequency increases
D. is minimum at the resonant frequency
5.The direction of electron current flow is:
A. from right to left
B. from positive to negative
C. from negative to positive
D. from right to left
6.A device that converts mechanical pressure to electrical energy is called a:
A. piezoelectric device
B. solar cell
C. photodiode
D. piezoelectric device
7.Which one of the following statements is true for the voltage in a parallel RC circuit?
A. The voltage always has the same amplitude and phase for every part of the circuit
B. The total voltage is equal to the sum of the voltages across the resistance and capacitance
C. The total voltage leads the total current by less than 90 degree
D. The voltage always has the same amplitude and phase for every part of the circuit
8.The Thevenin resistance is equal in value to the
A. Load resistance
B. Half the load resistance
C. Internal resistance of a Morton circuit
D. Load resistance
9.Most AC power is obtained from:
A. generators
B. batteries
C. oscillators
D. generators
10.The value of a capacitor can be made larger by:
A. increasing the area of the plates
B. decreasing the area of the plates
C. increasing the frequency of the applied voltage
D. increasing the area of the plates
11.The value of a capacitor can be made larger by:
A. moving the plates further apart
B. moving the plates closer together
C. increasing the voltage applied to the plates
D. moving the plates further apart
12.The primary impedance of a transformer is 60 ohm and the secondary impedance is 120 ohm. What is the impedance ratio?
A. 0.25
B. 180
C. 0.5
D. 0.25
13.Suppose a voltage source has an ideal voltage of 12V and an internal resistance of 0.5W. For what values of load resistance will the voltage source appear stiff?
A. 5 Ohm
B. 50 Ohm or more
C. 100 Ohm
D. 5 Ohm
14.Electron current is flowing through a conductor in a direction you might describe as straight into this page. What is the direction of the resulting magnetic field?
A. Clockwise
B. Counterclockwise
C. Out of this page
D. Clockwise
15.Which one of the following principles best describes the basic operation of an electromagnet?
A. Current is induced in a conductor that is moving through a magnetic field
B. Like magnetic poles repel, while unlike poles attract
C. Current flowing through a conductor generates a magnetic field
D. Current is induced in a conductor that is moving through a magnetic field
16.The transistor has a collector current of 2 mA. If the current gain is 135, what is the base current?
A. 14.8 �A
B. 10.3 �A
C. 7.8 �A
D. 14.8 �A
17.Current and voltage are said to be in phase when:
A. their waveforms are both ac or both dc
B. they have the same amplitude and frequency
C. their waveforms cross through zero and reach positive and negative peaks at the same time
D. their waveforms are both ac or both dc
18.Silicon atoms combine into an orderly pattern called a
A. Crystal
B. Covalent bond
C. Semiconductor
D. Crystal
19.The rotating coil of wire in an electric motor is called the:
A. armature
B. brush
C. commutator
D. armature
20.A resistor has a rated value of 100 ohm and a tolerance of 10%. What is its minimum and maximum allowable resistance value?
A. 90 Ohm - 101 ohm
B. 90 Ohm - 110 ohm
C. 98 Ohm - 100.1 ohm
D. 90 Ohm - 101 ohm
21.When a parallel RLC circuit is operating at its resonant frequency:
A. capacitive reactance is greater than the inductive reactance
B. inductive reactance is greater than the capacitive reactance
C. inductive reactance is equal to the capacitive reactance
D. capacitive reactance is greater than the inductive reactance
22.For normal operation of the transistor, the collector diode has to be
A. Forward-biased
B. Reverse-biased
C. Nonconducting
D. Forward-biased
23.In a step-down transformer, which is larger?
A. Primary voltage
B. Secondary voltage
C. Neither
D. Primary voltage
24.What is the barrier potential of a silicon diode at room temperature?
A. 0.7V
B. 0.3V
C. 1 V
D. 0.7V
25.The Norton current is sometimes called the
A. Shorted-load current
B. Open-load current
C. Thevenin current
D. Shorted-load current
26.At room temperature a conductor has low many holes?
A. Same number as free electrons
B. many
C. Only those produced by thermal energy
D. Same number as free electrons
27.A current source has an internal resistance of 100 kW. What is the largest load resistance if the current source must appear stiff?
A. 2 k Ohm
B. 10 k Ohm
C. 20 k Ohm
D. 2 k Ohm
28.When the Q point moves along the load line, the voltage increases when the current
A. Decreases
B. Stays the same
C. Increases
D. Decreases
29.What is the smallest number of polarities required for current flow?
A. One - a negative terminal
B. Two - a negative terminal and a positive terminal
C. Three - negative, positive and neutral terminals
D. One - a negative terminal
30.A diode is in series with 220W. If the voltage across the resister is 4V, what is the current through the diode?
A. 55 A
B. 55.86 A
C. 18.2 mA
D. 55 A
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