Inspector of Factories • Paper-III
Which one of the following 8085 assembly language instructions does not affect the contents of the accumulator?
A)
CMA
B)
CMP B
C)
DAA
D)
ADD B
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'ADD B' (Option D).
Inspector of Factories • Paper-III
Indicate which of the following circuits cannot demodulate SSB -
A)
Balanced modulator
B)
Product detector
C)
BFO
D)
Phase discriminator
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Balanced modulator' (Option A).
Inspector of Factories • Paper-III
A chopper, where voltage as well as current remain negative, is known as -
A)
type-A
B)
type-B
C)
type-C
D)
type-D
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'type-C' (Option C).
Inspector of Factories • Paper-III
Reactive loading of supply lines by a converter is directly dependent on -
A)
displacement angle only
B)
displacement angle and distortion factor
C)
back emf in the load circuit
D)
circuit configuration
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'back emf in the load circuit' (Option C).
Inspector of Factories • Paper-III
If a diode is connected in anti parallel with a thyristor, then -
A)
both turn off power loss and turn off time decrease
B)
turn off power loss decreases but turn off time increases
C)
turn off power loss increases but turn off time decreases
D)
none of these
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'turn off power loss decreases but turn off time increases' (Option B).
Inspector of Factories • Paper-III
A differential amplifier is invariably used in the input stage of all op-amps. This is done basically to provide the op-amps with a very high -
A)
CMMR
B)
Bandwidth
C)
Slew rate
D)
Open-loop gain
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Open-loop gain' (Option D).
Inspector of Factories • Paper-III
Which one of the following is NOT a vectored interrupted?
A)
TRAP
B)
INTR
C)
RST 3
D)
RST 7.5
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'INTR' (Option B).
Inspector of Factories • Paper-III
In dc choppers, per unit ripple is maximum when duty cycle a is -
A)
0.1
B)
0.3
C)
0.5
D)
0.7
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '0.3' (Option B).
Inspector of Factories • Paper-III
Which of the following pulse modulation systems is analog?
A)
PCM
B)
Differential PCM
C)
PWM
D)
Delta
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'PWM' (Option C).
Inspector of Factories • Paper-III
Why is an external pass resistor used in a voltage regulator?
A)
For short circuit protection
B)
For increasing the current that regulator can handle
C)
For increasing the output voltage
D)
For improving the regulation
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'For increasing the current that regulator can handle' (Option B).
Inspector of Factories • Paper-III
When a subroutine is called, the address of the instruction following the CALL instruction is stored in/ on the -
A)
Stack pointer
B)
Accumulator
C)
Program counter
D)
Stack
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Accumulator' (Option B).
Inspector of Factories • Paper-III
In a forward biased photo diode with increase in incident light intensity, the diode current -
A)
increase
B)
remain constant
C)
decrease
D)
remaining constant, the voltage drop across the diode increase
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'decrease' (Option C).
Inspector of Factories • Paper-III
The gain of a bipolar transistor drops at high frequencies. This is because of the -
A)
Coupling and bypass capacitors
B)
Early effect
C)
Inter-electrode transistor capacitance
D)
Both (a) & (c)
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Coupling and bypass capacitors' (Option A).
Inspector of Factories • Paper-III
In single pulse modulation of PWM inverters, the pulse width is 120 degrees. For an input voltage of 220 V dc, the r.m.s value of output voltage is -
A)
179.63 V
B)
254.04 V
C)
127.02 V
D)
185.04 V
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '254.04 V' (Option B).
Inspector of Factories • Paper-III
In a single phase full converter, for continuous conduction, each pair of SCRs conduct for -
A)
p-a
B)
p
C)
a
D)
p+a
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'p-a' (Option A).
Inspector of Factories • Paper-III
The most common modulation system used for telegraphy is -
A)
frequency-shift keying
B)
two-tone modulation
C)
pulse-code modulation
D)
single-tone modulation
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'pulse-code modulation' (Option C).
Inspector of Factories • Paper-III
In a single phase modulation of PWM inverters, third harmonics can be eliminated if pulse width is equal to -
A)
30 degrees
B)
60 degrees
C)
120 degrees
D)
150 degrees
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '60 degrees' (Option B).
Inspector of Factories • Paper-III
TRIAC cannot be used in a.c. voltage regulator for a -
A)
resistive load
B)
back emf load
C)
inductive load
D)
resistive inductive load
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'inductive load' (Option C).
Inspector of Factories • Paper-III
The number of output pins of a 8085 microprocessor are -
A)
40
B)
27
C)
21
D)
19
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '40' (Option A).
Inspector of Factories • Paper-III
Power electronic device with poor turn off gain is -
A)
a symmetrical thyristor
B)
a conventional thyristor
C)
power bipolar junction transistor
D)
gate turn off thyristor
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'a symmetrical thyristor' (Option A).
Inspector of Factories • Paper-III
A step up chopper has source voltage 50 V and output 100 V. If the pulse width is 10 µsec, the chopping frequency will be -
A)
50 KHz
B)
100 KHz
C)
5 KHz
D)
10 KHz
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '10 KHz' (Option D).
Inspector of Factories • Paper-III
The synchronisation between microprocessor and memory is done by -
A)
ALE signal
B)
HOLD signal
C)
READY signal
D)
None of these
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'READY signal' (Option C).
Inspector of Factories • Paper-III
The most commonly used filters in SSB generation are -
A)
mechanical
B)
RC
C)
LC
D)
low-pass
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'LC' (Option C).
Inspector of Factories • Paper-III
Indicate which of the following systems is digital -
A)
Pulse-position modulation
B)
Pulse-code modulation
C)
Pulse-width modulation
D)
Pulse-frequency modulation
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Pulse-position modulation' (Option A).
Inspector of Factories • Paper-III
IGBT is used for application in -
A)
Low power
B)
Medium power
C)
High power
D)
None of these
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Medium power' (Option B).
