CET 1 Flashcards
The curve y= x^4 is:
A. Concave up only for negative values of x
B. Concave up only for positive values of x
C. Concave down for all values of x
D. Concave up for all values of x
D. Concave up for all values of x
If a function is continuous at a point,
A. the limit must exist at the point and the value of the limit should be the same as the value of the function at the point.
B. the limit of the function at the point tends
to infinity
C. the function must be differentiable at the
point
D. the limit of the function may not exist at
the point
A. the limit must exist at the point and the value of the limit should be the same as the value of the function at the point.
At the maximum point, the second
derivative of the curve is
A. Undefined
B. Positive
C. 0
D. Negative
D. Negative
Which of the following represents the
best value for a stability factor for a BJT
amplifier?
A. 0.5%
B. 98%
C. 2%
D. 10%
A. 0.5%
The region to the left of the pinch-off
locus is referred to as the _____ region.
A. None of these choices
B. saturation
C. ohmic
D. cut-off
C. ohmic
The v-i characteristics of a FET is shown
in the Fig. D2. In which region is the
device biased for small signal
amplification.
(CET 1 figure)
A. CD
B. BC
C. AB
D. BD
B. BC
Which of the following is true for
pentavalent impurities?
A. Increase the conduction of a
semiconductror material
B. Are introduced by adding aluminum atoms
to a semiconductor material
C. Have three valence electrons
D. Introduce holes when added to a
semiconductor material
A. Increase the conduction of a
semiconductror material
You have a light-dimmer circuit using an SCR. In testing the circuit, you find that 1G = O mA and the light is still on. You conclude that the trouble might be one of the following:
A. this is normal; nothing is wrong.
B. the switch is faulty.
C. the gate circuit is shorted.
D. the SCR is open.
A. this is normal; nothing is wrong.
With the Zener diode in the “on” state,
increasing lL will _ Iz and__IR. (Figure CET 1)
A. decrease, keep the same level of
B. decrease, increase
C. increase, keep the same level of
D. increase, decrease
A. decrease, keep the same level of
In colour TV receiver, varactor diode is
used for
A. both detection and rectification
B. detection
C. rectification
D. tuning
D. tuning
If the flux density for a given mmf is half that of the magnetic field strength, what happens to the absolute permeability?
A. remains the same
B. halved
C. doubled
D. reduced
A. remains the same
Which of the following amplifier classes
operates at 50% of the input?
A. Class C
B. Class A
C. Class B
D. Class ABD.
C. Class B
If the emitter resistance increases in a
VDB circuit, the collector voltage
A. Increases
B. Stays the same
C. Doubles
D. Decreases
A. Increases
Resistivity of a wire depends on
A. cross-sectional area
B. length
C. both length and cross-sectional area
D. material
D. material
The best place to use a wirewound
resistor is:
A. In a radio-frequency amplifier.
B. In a high-power, radio-frequency circuit.
C. In a high-power, direct-current circuit.
D. When the resistor doesn’t dissipate much
power.
C. In a high-power, direct-current circuit.
Refer to the given figure. This circuit is
known as
(CET 1 FIGURE)
A. a differentiator.
B. an integrator.
C. a noninverting amplifier.
D. a summing amplifier.
A. a differentiator.
Refer to the given figure. The most
probable cause of trouble, if any, from
these voltage measurements is
(CET 1 FIGURE)
A. RE is open
B. a short from collector to emitter.
C. the base-emitter junction is open.
D. no problems.
D. no problems.
As the channel width of a JFET decreases, the source-to-drain resistance _____
A. decreases
B. increases
C. is not affected
D. remains constant
B. increases
If the resistance R increases in an RC
circuit, but the capacitance and
frequency are nonzero and constant,
then the vector in the RC plane will
A. get longer and rotate counterclockwise
B. get shorter and rotate clockwise
C. get longer and rotate clockwise
D. get shorter and rotate counterclockwise
A. get longer and rotate counterclockwise
A low voltage, such as 12 V:
A. Can be dangerous under certain
conditions.
B. Is never dangerous.
C. Is dangerous if it is ac, but not if it is dc.
D. Is always dangerous.
A. Can be dangerous under certain
conditions.
The output frequency of a half-wave
rectifier with a 60 Hz sinusoidal input is _____
A. 60Hz
B. 0Hz
C. 120Hz
D. 30HZ
A. 60Hz
