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Home » GAT Subject » Aptitude Test - 241
Hassan
1.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
2.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
3.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
4.The number of free electrons and holes in intrinsic semiconductor increases when the temperature
A. Decreases
B. Increases
C. Stays the same
D. Decreases
5.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
6.Holes are the minority carriers in which type of semiconductor?
A. Extrinsic
B. Intrinsic
C. n-type
D. Extrinsic
7.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
8.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
9.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
10.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
11.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
12.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
13.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
14.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
15.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
16.The merging of a free electron and a hole is called
A. Covalent bonding
B. Lifetime
C. Recombination
D. Covalent bonding
17.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
18.The basic unit of measurement for current is the:
A. volt
B. watt
C. ampere
D. volt
19.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
20.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
21.In a transistor operates at the middle of the load line, an increase in the base resistance will move the Q point
A. down
B. up
C. nowhere
D. down
22.Voltage is
A. The flow of charged particles through a material
B. The smallest electrically charged particle
C. Trie force that causes electrons to flow
D. The flow of charged particles through a material
23.What is the turns ratio for the transformer specified in the above question?
A. 10.738
B. 0.707
C. 1.5
D. 10.738
24.The total impedance of a series RLC circuit:
A. is minimum at the resonant frequency
B. always increases as the applied frequency increases
C. always decreases as the applied frequency increases
D. is minimum at the resonant frequency
25.The direction of electron current flow is:
A. from right to left
B. from positive to negative
C. from negative to positive
D. from right to left
26.A device that converts mechanical pressure to electrical energy is called a:
A. piezoelectric device
B. solar cell
C. photodiode
D. piezoelectric device
27.Which one of the following statements is true for the voltage in a parallel RC circuit?
A. The voltage always has the same amplitude and phase for every part of the circuit
B. The total voltage is equal to the sum of the voltages across the resistance and capacitance
C. The total voltage leads the total current by less than 90 degree
D. The voltage always has the same amplitude and phase for every part of the circuit
28.The Thevenin resistance is equal in value to the
A. Load resistance
B. Half the load resistance
C. Internal resistance of a Morton circuit
D. Load resistance
29.Most AC power is obtained from:
A. generators
B. batteries
C. oscillators
D. generators
30.The value of a capacitor can be made larger by:
A. increasing the area of the plates
B. decreasing the area of the plates
C. increasing the frequency of the applied voltage
D. increasing the area of the plates
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