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Home » GAT Subject » Aptitude Test - 240
Hassan
1.For a pure capacitor:
A. ac current and voltage are exactly in phase
B. ac current leads the voltage by 90 degree
C. ac current is converted to dc voltage
D. ac current and voltage are exactly in phase
2.The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the:
A. rotor
B. armature
C. battery
D. rotor
3.In a pure inductor:
A. ac current leads the voltage by 90 degree
B. ac current and voltage are exactly in phase
C. ac current lags the voltage by 90 degree
D. ac current leads the voltage by 90 degree
4.Waveforms are graphs that show:
A. frequency on the vertical axis and amplitude on the horizontal axis
B. amplitude on the vertical axis and frequency on the horizontal axis
C. amplitude on the vertical axis and the passage of time on the horizontal axis
D. frequency on the vertical axis and amplitude on the horizontal axis
5.When the collector current increases, what does the current gain do?
A. decreases
B. stays the same
C. increases
D. decreases
6.How many types of flow are there in a semiconductor?
A. 0
B. 1
C. 2
D. 0
7.Which one of the following devices is most often used for measuring opposition to current flow in a circuit?
A. Ammeter
B. Voltmeter
C. Ohmmeter
D. Ammeter
8.What form of energy is used to maintain an imbalance of charges between the terminals of a battery?
A. Electronical energy
B. Mechanical energy
C. Chemical energy
D. Electronical energy
9.Which one of the following statements best applies to a parallel RLC circuit?
A. The voltage waveform for each component always has the same amplitude and phase as the applied voltage
B. The sum of the current is always less than the applied current
C. The current waveform for each component always has the same amplitude and phase as the applied current
D. The voltage waveform for each component always has the same amplitude and phase as the applied voltage
10.The equivalent of 1 micro A is:
A. 10000A
B. 1000 A
C. one-millionth of an ampere
D. 10000A
11.Which one of the following statements best describes magnetic hysteresis?
A. Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
B. Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
C. Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
D. Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
12.Which one of the following phrases best describes residual magnetism?
A. Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
B. The force of attraction between the poles of a permanent and temporary magnetic field
C. The amount of magnetic flux that is not confined to the core material of an electromagnet
D. Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
13.A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?
A. 7.8 mA
B. 208 mA
C. 200 mA
D. 7.8 mA
14.Household light bulbs have a given power rating, and they operate at 120 V. Which one of the following equations most directly provides the current rating of these light bulbs?
A. P = I2R
B. P = IE
C. P = E2/R
D. P = I2R
15.Which one of the following phrases most accurately describes a purely inductive circuit?
A. Resistances provide the only opposition to current flow
B. Inductive reactance provides the only opposition to current flow
C. Combinations of resistance and inductive reactance provide any opposition to current flow
D. Resistances provide the only opposition to current flow
16.The knee voltage of a diode is approximately equal to the
A. Applied voltage
B. Barrier potential
C. Breakdown voltage
D. Applied voltage
17.A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have?
A. 310 Ohm
B. 400 Ohm
C. 410 Ohm
D. 310 Ohm
18.The rms value of a sine waveform is:
A. the number of cycles completed in one second
B. the time required to complete one full cycle
C. equal to 0.707 times the peak amplitude
D. the number of cycles completed in one second
19.A high-pass filter:
A. passes lower-frequency signals and reduces higher-frequency signals
B. passes higher-frequency signals and reduces lower-frequency signals
C. has no effect on ac signals
D. passes lower-frequency signals and reduces higher-frequency signals
20.Which one of the following statements is true for the voltages in a series RC circuit?
A. The total voltage is equal to the sum of the voltages across the resistance and capacitance
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 capacitance
D. The total voltage is equal to the sum of the voltages across the resistance and capacitance
21.A battery is a device composed of one or more:
A. chemical cells
B. voltage generators
C. solar cells
D. chemical cells
22.Doubling the operating voltage of a purely capacitive circuit:
A. has no effect on the capacitive reactance
B. doubles the amount of capacitive reactance
C. multiplies the capacitive reactance by 7
D. has no effect on the capacitive reactance
23.How much current flows through a 0.02-H choke that is operating from a 12-V ac, 100-Hz source?
A. 0.02 A
B. 0.955 A
C. 10:00 AM
D. 0.02 A
24.The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?
A. 250 ?A
B. 350 ?A
C. 0.25 ?A
D. 250 ?A
25.What is the phase shift between total current and voltage in the circuit of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm
A. 180 degree
B. 30 degree
C. 45 degree
D. 180 degree
26.Molecule is
A. The smallest particle of a substance that retains the properties of that substance
B. A atom that has a shortage of electrons in its outer orbit
C. A atom that has an excessive number of electrons in its outer orbit
D. The smallest particle of a substance that retains the properties of that substance
27.What form of energy is used for creating static electricity?
A. Solar energy
B. Mechanical energy
C. Chemical energy
D. Solar energy
28.Suppose the zener diode has a breakdown voltage of 10 V and zener resistance of 8.5 W, what is the additional voltage when the current is 20 mA?
A. 0.17 V
B. 10.17 V
C. 20 V
D. 0.17 V
29.A transistor has a current gain of 125 and a base current of 30 µA. What is the collector current?
A. 3.75 mA
B. 3.2 mA
C. 0.05 mA
D. 3.75 mA
30.A dielectric material is:
A. a good conductor
B. a good insulator
C. a poor conductor of electrostatic fields
D. a good conductor
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