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Home » GAT Subject » Aptitude Test - 243
Hassan
1.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
2.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
3.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
4.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
5.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
6.As the temperature increases, the current gain
A. increases
B. decreases
C. contant
D. increases
7.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
8.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
9.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
10.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
11.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
12.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
13.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
14.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
15.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
16.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
17.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
18.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
19.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
20.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
21.To get the Thevenin voltage, you have to
A. Short the load resistor
B. Open the load resister
C. Short the voltage source
D. Short the load resistor
22.Which one of the following properties of a magnetic circuit can be directly compared to resistance in an electrical circuit?
A. Reluctance
B. Permeability
C. Permeance
D. Reluctance
23.How many types of flow are there in a semiconductor?
A. 0
B. 1
C. 2
D. 0
24.When operating above its resonant frequency, a parallel RLC circuit has the characteristics of a:
A. parallel RL circuit
B. parallel RC circuit
C. parallel RLC circuit operated above its resonant frequency
D. parallel RL circuit
25.Doubling the operating frequency of an inductive circuit:
A. has no effect on the inductive reactance
B. doubles the amount of inductive reactance
C. multiplies the inductive reactance by 6.28
D. has no effect on the inductive reactance
26.A circuit has a Norton current of 10 mA and a Norton resistance of 10 kW. What is the Thevenin circuit?
A. 1000 V and a series resistance of 10 k Ohm
B. 100 V and a parallel resistance of 10 k Ohm
C. 100 V and a series resistance of 10 k Ohm
D. 1000 V and a series resistance of 10 k Ohm
27.Which one of the following statements is true?
A. Power dissipation of a pure capacitor increases with operating frequency
B. Power dissipation of a pure capacitor decreases with operating frequency
C. There is no meaningful relationship between the power dissipation of a pure capacitor and its operating frequency
D. Power dissipation of a pure capacitor increases with operating frequency
28.A power transformer steps 100 V down to 10 V. If the current in its primary winding is 2 A, what is the current in the secondary winding?
A. 50 A
B. 12:00 AM
C. 5:00 AM
D. 50 A
29.If a load resistance is 1 kW, a stiff voltage 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
30.A typical light switch in your home is a:
A. knife switch
B. toggle switch
C. rotary switch
D. knife switch
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