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Home » GAT Subject » Computer Science » Aptitude Test - 112
1.A battery is a device composed of one or more:
A. chemical cells
B. voltage generators
C. solar cells
D. chemical cells
2.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
3.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
4.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
5.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
6.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
7.What form of energy is used for creating static electricity?
A. Solar energy
B. Mechanical energy
C. Chemical energy
D. Solar energy
8.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
9.A transistor has a current gain of 125 and a base current of 30 �A. What is the collector current?
A. 3.75 mA
B. 3.2 mA
C. 0.05 mA
D. 3.75 mA
10.A dielectric material is:
A. a good conductor
B. a good insulator
C. a poor conductor of electrostatic fields
D. a good conductor
11.A certain electromagnet has 1000 turns of wire. How much current must flow through the coil in order to generate an mmf of 100 ampere-turns?
A. 0.1 A
B. 1000 A
C. 10:00 AM
D. 0.1 A
12.If a load resistance is 1 kW, a stiff current 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
13.A flashlight battery has internal resistance of 1W. For what values of load resistance does the flashlight battery appear stiff?
A. 60 Ohm
B. 50 Ohm
C. 100 Ohm or more
D. 60 Ohm
14.The number of free electrons and holes in intrinsic semiconductor increases when the temperature
A. Decreases
B. Increases
C. Stays the same
D. Decreases
15.Which one of the following statements is true for current flowing in a parallel circuit?
A. The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it
B. The same current always flows through every part of a parallel circuit
C. The total current in a parallel circuit is equal to the total voltage multiplied by the total resistance
D. The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it
16.Holes are the minority carriers in which type of semiconductor?
A. Extrinsic
B. Intrinsic
C. n-type
D. Extrinsic
17.Doubling the number of turns of wire in an inductor:
A. reduces the value of inductance by one-half
B. multiplies the value of inductance by two
C. multiplies the value of inductance by four
D. reduces the value of inductance by one-half
18.A farad is defined as the amount of capacitance necessary for:
A. dissipating 1 W of power
B. causing an ac phase shift greater than 90 degree
C. storing 1 V for 1 second
D. dissipating 1 W of power
19.What is the capacitive reactance of a 0.1 micro F capacitor that is operating at 1000 Hz?
A. less than 1 Ohm
B. 1590 Ohm
C. 312 Ohm
D. less than 1 Ohm
20.A certain power transformer has a turns ratio of 5. What voltage can you expect at the secondary winding when you apply 120 V to the primary winding?
A. 4.73
B. 0.4 V
C. 24 V
D. 4.73
21.Which one of the following statements is true for the currents in a parallel RC circuit?
A. The total current is equal to the sum of the currents for the resistance and capacitance
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 for the resistance and capacitance
D. The total current is equal to the sum of the currents for the resistance and capacitance
22.Which one of the following statements is true for current flowing in a series circuit?
A. The amount of current flow through each part of a series circuit can be different, depending on the resistance of each part and the amount of voltage applied to it
B. The total current in a series circuit is equal to the sum of the currents flowing through the individual components in the circuit
C. The same current flows through every part of a series circuit
D. The amount of current flow through each part of a series circuit can be different, depending on the resistance of each part and the amount of voltage applied to it
23.The total inductance of a series inductor circuit is:
A. equal to the sum of the individual inductance values
B. equal to the sum of the individual inductive-reactance values
C. less than the value of the smallest inductor
D. equal to the sum of the individual inductance values
24.When the graph of current versus voltage is a straight line, the device is referred to as
A. Active
B. Linear
C. Nonlinear
D. Active
25.Which one of the following statements most accurately applies to the frequency of a waveform?
A. The actual frequency of a sine waveform is 1.41 times the working frequency
B. Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz
C. The higher the amplitude of a waveform, the higher its frequency
D. The actual frequency of a sine waveform is 1.41 times the working frequency
26.The merging of a free electron and a hole is called
A. Covalent bonding
B. Lifetime
C. Recombination
D. Covalent bonding
27.One henry of inductance is defined as:
A. the amount of counter emf required to reduce a current to 1 A
B. the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second
C. the amount of inductance required to change the frequency of a current by 1 Hz
D. the amount of counter emf required to reduce a current to 1 A
28.The basic unit of measurement for current is the:
A. volt
B. watt
C. ampere
D. volt
29.Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?
A. The voltage remains at one polarity and at a steady level
B. The voltage remains at one polarity but changes value periodically
C. The voltage causes current to flow in two directions at the same time
D. The voltage remains at one polarity and at a steady level
30.What is a negative ion?
A. An atom that contains more electrons than neutrons
B. An atom that contains more protons than neutrons
C. An atom that contains more electrons than protons
D. An atom that contains more electrons than neutrons
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