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Home » GAT Subject » Computer Science » Aptitude Test - 115
1.To get the Thevenin voltage, you have to
A. Short the load resistor
B. Open the load resister
C. Short the voltage source
D. Short the load resistor
2.Which one of the following properties of a magnetic circuit can be directly compared to resistance in an electrical circuit?
A. Reluctance
B. Permeability
C. Permeance
D. Reluctance
3.How many types of flow are there in a semiconductor?
A. 0
B. 1
C. 2
D. 0
4.When operating above its resonant frequency, a parallel RLC circuit has the characteristics of a:
A. parallel RL circuit
B. parallel RC circuit
C. parallel RLC circuit operated above its resonant frequency
D. parallel RL circuit
5.Doubling the operating frequency of an inductive circuit:
A. has no effect on the inductive reactance
B. doubles the amount of inductive reactance
C. multiplies the inductive reactance by 6.28
D. has no effect on the inductive reactance
6.A circuit has a Norton current of 10 mA and a Norton resistance of 10 kW. What is the Thevenin circuit?
A. 1000 V and a series resistance of 10 k Ohm
B. 100 V and a parallel resistance of 10 k Ohm
C. 100 V and a series resistance of 10 k Ohm
D. 1000 V and a series resistance of 10 k Ohm
7.Which one of the following statements is true?
A. Power dissipation of a pure capacitor increases with operating frequency
B. Power dissipation of a pure capacitor decreases with operating frequency
C. There is no meaningful relationship between the power dissipation of a pure capacitor and its operating frequency
D. Power dissipation of a pure capacitor increases with operating frequency
8.A power transformer steps 100 V down to 10 V. If the current in its primary winding is 2 A, what is the current in the secondary winding?
A. 50 A
B. 12:00 AM
C. 5:00 AM
D. 50 A
9.If a load resistance is 1 kW, a stiff voltage source has a resistance of
A. At least 10 Ohm
B. less than 10 Ohm
C. More than 100 k Ohm
D. At least 10 Ohm
10.A typical light switch in your home is a:
A. knife switch
B. toggle switch
C. rotary switch
D. knife switch
11.Suppose the voltage from a power outlet is 120 Vrms. What is the peak voltage?
A. 100 V
B. 120 V
C. 170 V
D. 100 V
12.A device that converts thermal energy to electrical energy is called a:
A. thermocouple
B. solar cell
C. chemical cell
D. thermocouple
13.How much power is being dissipated by a 1000 W resistance that has 25 V applied to it?
A. 0.24 W
B. 0.625 W
C. 80 W
D. 0.24 W
14.A device that converts chemical energy to electrical energy is called a:
A. solar cell
B. thermocouple
C. chemical cell
D. solar cell
15.Suppose the peak value of a sinusoidal voltage is 50 V. What is the rms value?
A. 37.4 V
B. 35.4 V
C. 38.74 V
D. 37.4 V
16.What is the difference between a conductor and an insulator?
A. A conductor allows current to flow much easier than an insulator does
B. An insulator has an excessive number of free electrons, while a conductor has a few free electrons or none at all
C. An insulator allows current to flow much easier than a conductor does
D. A conductor allows current to flow much easier than an insulator does
17.A circuit has two different voltage sources that are connected in a series-aiding form. If the sources are rated at 6 V and 9 V, what is the total source voltage?
A. 15 V
B. 16 V
C. 7.5 V
D. 15 V
18.At room temperature an intrinsic semiconductor has
A. a few free electrons and holes
B. many holes
C. many free electrons
D. a few free electrons and holes
19.If the base supply voltage increases, the Q point moves
A. down
B. up
C. nowhere
D. down
20.Positive ions are atoms that have
A. Gained a proton
B. Lost a proton
C. Gained an electron
D. Gained a proton
21.Which one of the following is a statement of Kirchhoffs current law?
A. The current through a resistance is proportional to the value of resistance and the IR drop across it
B. The total current in a parallel circuit is less than the value of the smallest current
C. The algebraic sum of currents in a loop is equal to zero
D. The current through a resistance is proportional to the value of resistance and the IR drop across it
22.Which one of the following statements is true?
A. inductive reactance decreases with operating frequency
B. inductive reactance is at a maximum for dc source voltages
C. inductive reactance increases with operating frequency
D. inductive reactance decreases with operating frequency
23.A zener diode has a voltage of 10 V and a current of 20 mA. What is the power dissipation?
A. 200 mW
B. 300 mW
C. 20 mW
D. 200 mW
24.Which one of the following phrasers best describes flux density?
A. The concentration of lines of magnetic force
B. The rate of change of the number of lines of magnetic force
C. The opposition to a build-up of magnetic fields
D. The concentration of lines of magnetic force
25.Which is the most widely used semiconductor?
A. Copper
B. Silicon
C. Germanium
D. Copper
26.The transistor has a current gain of 175. If the base current is 0.1 mA, what is the collector current?
A. 1750 mA
B. 17.5 mA
C. 175 mA
D. 1750 mA
27.An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?
A. Doping
B. Valence electrons
C. Free electrons
D. Doping
28.Which one of the following statements is true?
A. Power dissipation of a pure inductor decreases with operating frequency
B. Power dissipation of a pure inductor is at a maximum for dc source voltages
C. Power dissipation of a pure inductor increases with operating frequency
D. Power dissipation of a pure inductor decreases with operating frequency
29.An audio transformer has a turn ratio of 9, What is its impedance ratio?
A. 81
B. 85
C. 6
D. 81
30.Which one of the following statements is true?
A. The secondary voltage for a step-down power transformer is greater than the primary voltage
B. The secondary current for a step-down power transformer is greater than the primary voltage
C. Parallel RLC circuit operated below its resonant frequency
D. The secondary voltage for a step-down power transformer is greater than the primary voltage
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