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Home » GAT Subject » Computer Science » Aptitude Test - 114
1.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
2.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
3.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
4.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
5.The nucleus of the copper atom contains how many protons?
A. 1
B. 4
C. 18
D. 1
6.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
7.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
8.Which one of the following devices is most often used for measuring electrical potential difference?
A. Voltmeter
B. Ohmmeter
C. Ammeter
D. Voltmeter
9.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
10.The equivalent of 1 megohms is:
A. 1 k ohm
B. 100,000 ohm
C. one-millionth of an ohm
D. 1 k ohm
11.Which one of the following equations most directly determines the amount of current flowing through a resistor when you know the value of the resistor and the voltage drop across it?
A. E = PR
B. E = I2R
C. I = E/R
D. E = PR
12.Suppose a current source has an Ideal current of 10 mA and an internal resistance of 20 MW. For what values of load resistance will the current source appear stiff?
A. 20 k Ohm or more
B. 200 k Ohm or less
C. 200 k Ohm or more
D. 20 k Ohm or more
13.If the current gain is 200 and the collector current is 100 mA, the base current is
A. 2 mA
B. 0.5 mA
C. 2:00 AM
D. 2 mA
14.Which one of the following statements is true for the voltages in a series RL circuit?
A. The total voltages is equal to the sum of the voltages across the resistance and inductance
B. The voltage always has the same amplitude and phase for every part of the circuit
C. The total voltage is less than the sum of the voltages across the resistance and inductance
D. The total voltages is equal to the sum of the voltages across the resistance and inductance
15.The core of an electromagnet is said to be in saturation when:
A. the core is permitted to move freely within the coil
B. an increase in current through the coil causes no further increase in the mmf
C. frequent changes in the direction of current through the coil causes heating effects in the core material
D. the core is permitted to move freely within the coil
16.As the temperature increases, the current gain
A. increases
B. decreases
C. contant
D. increases
17.Assuming 100% efficiency, what is the power being consumed at the secondary winding of the transformer described in question 91?
A. 200 W
B. 1000 W
C. 20 W
D. 200 W
18.Doubling the diameter of the coil in an inductor:
A. multiplies the value of inductance by two
B. reduces the value of inductance by one-half
C. reduces the value of inductance by one-fourth
D. multiplies the value of inductance by two
19.Which one of the following statements is true for the impedance of a series RC circuit?
A. The impedance is greater than the sum of the resistance and capacitive reactance
B. The impedance is equal to the sum of the resistance and capacitive reactance
C. The impedance is greater than either the resistance or capacitive reactance but less than their sum
D. The impedance is greater than the sum of the resistance and capacitive reactance
20.If a transistor operates at the middle of the load line, an increase in the current gain will move the Q point
A. down
B. up
C. nowhere
D. down
21.What is the turns ratio of a power transformer that shows 50 V at its secondary winding when you apply 150 V to its primary winding?
A. 4-Jan
B. 3-Jan
C. 2
D. 4-Jan
22.What is the inductive reactance of a 0.1-H coil that is operating at 1000 Hz?
A. 100 Ohm
B. Less than 1 Ohm
C. 628 Ohm
D. 100 Ohm
23.Which one of the following is a statement of KirchhofFs voltage law?
A. The total voltage in a parallel circuit is less than the value of the smallest voltage
B. The algebraic sum of voltages in a loop is equal to zero
C. The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it
D. The total voltage in a parallel circuit is less than the value of the smallest voltage
24.What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm?
A. 60 Ohm
B. 99.3 Ohm
C. 250 Ohm
D. 60 Ohm
25.Current can flow through a normally open push button switch as long as:
A. you are pressing the button
B. you are not pressing the button
C. its contact remain open
D. you are pressing the button
26.Doubling the operating frequency of a purely capacitive circuit:
A. has no effect on the total circuit current
B. doubles the amount of total current
C. cuts the total current by one-half
D. has no effect on the total circuit current
27.How much current flows through a 0.02 micro F capacitor that is operating from a 12-V ac, 100-Hz source?
A. 0.151 mA
B. 157 raA
C. 0.995 mA
D. 0.151 mA
28.An unloaded zener regulator has a source voltage of 20 V, a series resistance of 330 W, and a zener voltage of 12 V, What is the Zener current?
A. 28.4 mA
B. 24.2 mA
C. 34.4 mA
D. 28.4 mA
29.The total capacitance of a series capacitor circuit is:
A. equal to the sun of the individual capacitive-reactance values
B. equal to the sum of the individual capacitance values
C. equal to the source voltage divided by total current
D. equal to the sun of the individual capacitive-reactance values
30.Assuming 100% efficiency, what is the power being applied to the primary winding of the transformer described in the above question?
A. 200 W
B. 1000 W
C. 20 W
D. 200 W
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