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Home » GAT Subject » Aptitude Test - 242
Hassan
1.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
2.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
3.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
4.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
5.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
6.The transistor has a collector current of 2 mA. If the current gain is 135, what is the base current?
A. 14.8 µA
B. 10.3 µA
C. 7.8 µA
D. 14.8 µA
7.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
8.Silicon atoms combine into an orderly pattern called a
A. Crystal
B. Covalent bond
C. Semiconductor
D. Crystal
9.The rotating coil of wire in an electric motor is called the:
A. armature
B. brush
C. commutator
D. armature
10.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
11.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
12.For normal operation of the transistor, the collector diode has to be
A. Forward-biased
B. Reverse-biased
C. Nonconducting
D. Forward-biased
13.In a step-down transformer, which is larger?
A. Primary voltage
B. Secondary voltage
C. Neither
D. Primary voltage
14.What is the barrier potential of a silicon diode at room temperature?
A. 0.7V
B. 0.3V
C. 1 V
D. 0.7V
15.The Norton current is sometimes called the
A. Shorted-load current
B. Open-load current
C. Thevenin current
D. Shorted-load current
16.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
17.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
18.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
19.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
20.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
21.Two diodes are in series. The first diode has a voltage of 0.75 V and the second has a voltage of 0.8 V. If the current through the first diode is 500 mA, what is the current through the second diode
A. 11 mA
B. 12 mA
C. 10 mA
D. 11 mA
22.The graph of current gain versus collector current indicates that the current gain
A. varies enormously
B. is contant
C. varies slightly
D. varies enormously
23.Which one of the following statements is true for the currents in a parallel RL circuit?
A. The total current is equal to the sum of the currents through the resistance and inductance
B. The current always has the same amplitude and phase for every part of the circuit
C. The total current is less than the sum of the currents through the resistance and inductance
D. The total current is equal to the sum of the currents through the resistance and inductance
24.What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with an inductor that has a reactance of 200 W?
A. 77.7 ohm
B. 89.3 ohm
C. 88.8 ohm
D. 77.7 ohm
25.The nucleus of the copper atom contains how many protons?
A. 1
B. 4
C. 18
D. 1
26.Which one of the following statements is true for voltage in a series circuit?
A. The total voltage is equal to the sum of the individual voltages in a series circuit
B. The total voltage in a series circuit is equal to the average value of the individual voltages
C. The total voltage of a series circuit is equal to the total current divided by the total resistance
D. The total voltage is equal to the sum of the individual voltages in a series circuit
27.A basic capacitor is composed of:
A. two conductors separated by a dielectric
B. two dielectrics separated by a conductor
C. two coils separated by a dielectric
D. two conductors separated by a dielectric
28.Which one of the following devices is most often used for measuring electrical potential difference?
A. Voltmeter
B. Ohmmeter
C. Ammeter
D. Voltmeter
29.Which one of the following equations most directly determines the power dissipation of a resistance when you know the voltage drop and amount of resistance?
A. P = I2R
B. P = IE
C. P = E2/R
D. P = I2R
30.The equivalent of 1 megohms is:
A. 1 k ohm
B. 100,000 ohm
C. one-millionth of an ohm
D. 1 k ohm
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