# Electrical Measurements Questions and Answers – Electronic Switch & Dual Beam Oscilloscope

This set of Electrical Measurements Interview Questions and Answers for Experienced people focuses on “Electronic Switch & Dual Beam Oscilloscope”.

1. Electronic switch is used in a dual trace oscilloscope.
a) True
b) False

Explanation: By using a single CRT gun, two signals can be displayed on the screen simultaneously by means of an electronic switch.

2. Signals are applied to ___________
a) input
b) gain control stage
c) output
d) capacitor

Explanation: In a dual trace oscilloscope, the signals are applied to the gain control as well as the gate control stage.

3. What adjusts the amplitudes of the signals A and B?
a) L1 and L2
b) C1 and C2
c) R1 and R2
d) Oscillator

Explanation: In a dual trace oscilloscope, the resistances R1 and R2 are used for adjusting the magnitudes of the amplitudes of the signals A and B of the two channels A and B.

4. What is the role of a square wave generator?
a) generates square waves
b) generates triangular waves
c) generates saw-tooth signals
d) generates alternate inputs

Explanation: A square wave generator in a dual trace oscilloscope provides alternate biasing signals to the switches Q3 and Q4.

5. How many switches work at a time?
a) 1
b) 3
c) 2
d) 5

Explanation: In a dual trace oscilloscope, the square wave generator provides alternate bias signals to the switches Q3 and Q4. When Q3 is conducting, Q4 remains off while Q3 is off, Q4 conducts.
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6. Square wave generator doesn’t reproduce the signals on the screen.
a) True
b) False

Explanation: In a dual trace oscilloscope, the square wave generator reproduces two signals on the screen. When the switching frequency of the square wave generator is higher than that of the individual signals, the bits of each signal are provided alternately to the vertical inputs.

7. A multitrace oscilloscope makes use of __________
a) three traces
b) two traces
c) many traces
d) one trace

Explanation: In a multitrace oscilloscope, a signle electron beam is used. It makes use of several traces by switching the Y deflection plates from one input signal to the other.

8. A dual beam oscilloscope has __________
a) 2 beams
b) 4 beams
c) 6 beams
d) 8 beams

Explanation: In a dual beam oscilloscope, the beams are deflected horizontally by means of a common set of plates. Each electron beam has its own set of vertical deflection plates.

9. Two voltages can be studied simultaneously by making use of __________
a) single electron gun
b) two electron guns
c) four electron guns
d) six electron guns

Explanation: On the Cathode Ray Oscilloscope, two voltages can be studied simultaneously by means of two electron guns generating two separate beams through a special cathode ray tube.

10. A dual beam oscilloscope has __________
a) 8 vertical deflection plates
b) 6 vertical deflection plates
c) 2 vertical deflection plates
d) 4 vertical deflection plates

Explanation: In a dual beam oscilloscope, there are two vertical deflection plates and two separate channels. Each channel consists of a preamplifier and an attenuator stage.

11. Sweep generator is triggered by __________
a) oscillator
b) flip-flop
c) transformer
d) channel A or B

Explanation: In a dual beam oscilloscope, the sweep generator is triggered internally by means of either the channel A signal or the channel B signal.

12. A sweep generator can be triggered by an external switch as well.
a) True
b) False

Explanation: In a dual beam oscilloscope, the sweep generator can be triggered by means of an external switch or a line frequency signal. This is done through means of a trigger selector switch.

13. A dual beam oscilloscope has same sweep rates for different channels.
a) True
b) False

Explanation: In a dual beam oscilloscope, the sweep rates are different for different channels. As a result the size and weight of the oscilloscope is increased. A dual beam oscilloscope has a separate time-base for different channels.

14. In a multi-beam oscilloscope __________
a) single beam is produced
b) three beams are produced
c) many beams are produced
d) two beams are produced

Explanation: In a multi-beam oscilloscope, several beams are produced from a single tube. Each system is made up of a separate set of vertical deflection plates and a common time base system.

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