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Home » GAT Subject » Aptitude Test - 244
Hassan
1.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
2.A device that converts thermal energy to electrical energy is called a:
A. thermocouple
B. solar cell
C. chemical cell
D. thermocouple
3.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
4.A device that converts chemical energy to electrical energy is called a:
A. solar cell
B. thermocouple
C. chemical cell
D. solar cell
5.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
6.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
7.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
8.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
9.If the base supply voltage increases, the Q point moves
A. down
B. up
C. nowhere
D. down
10.Positive ions are atoms that have
A. Gained a proton
B. Lost a proton
C. Gained an electron
D. Gained a proton
11.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
12.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
13.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
14.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
15.Which is the most widely used semiconductor?
A. Copper
B. Silicon
C. Germanium
D. Copper
16.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
17.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
18.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
19.An audio transformer has a turn ratio of 9, What is its impedance ratio?
A. 81
B. 85
C. 6
D. 81
20.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
21.How many protons does the nucleus of a silicon atom contain?
A. 4
B. 29
C. 14
D. 4
22.A circuit has two different voltage sources that are connected in a series-opposing form. If the sources are rated at 6 V and 9 V, what is the total source voltage?
A. 3 V
B. 16 V
C. 7.5 V
D. 3 V
23.The emitter diode is usually
A. Forward-biased
B. Reverse-biased
C. Nonconducting
D. Forward-biased
24.1 Microfarad is the same as:
A. 1 millionth of a picofarad
B. 1000 millifarads
C. 1 million picofarads
D. 1 millionth of a picofarad
25.Which one of the following statements is true for resistance in a parallel circuit?
A. The total resistance is equal to the sum of the individual resistances in a parallel circuit.
B. The total resistance of a parallel circuit is always less than the value of the smallest resistance
C. The total resistance of a parallel circuit is equal to the total voltage
D. The total resistance is equal to the sum of the individual resistances in a parallel circuit.
26.The direction of conventional current flow is:
A. from negative to positive
B. from positive to negative
C. from left to right
D. from negative to positive
27.Doubling the operating frequency of a purely inductive circuit:
A. doubles the amount of current through the inductors
B. has no effect on the current through the inductors
C. cuts the current through the inductors one-half
D. doubles the amount of current through the inductors
28.The secondary voltage for a certain power transformer is twice the voltage applied to the primary. The current flowing in the secondary winding will be:
A. One-half the primary current
B. Same as the primary current
C. Twice the primary current
D. One-half the primary current
29.What is a free electron?
A. An electron that has been freed from its parent atom
B. An electron that costs nothing
C. An electron that has no electrical charge
D. An electron that has been freed from its parent atom
30.To get the Norton current, you have to
A. Short the load resistor
B. Open the load resistor
C. Short the voltage source
D. Short the load resistor
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