# Instrumentation Transducers Questions and Answers – Time Interval Measurement

This set of Instrumentation Transducers Problems focuses on “Time Interval Measurement”.

1. In a time interval measuring device, two pulses are used ______________
a) To produce triangular wave
b) To start and stop gate circuit
c) To produce sinusoidal signal
d) None of the mentioned

Explanation: Two pulses, start pulse and stop pulse are used to on and off gate circuit for measuring a time interval.

2. Start and stop pulses are produced by ______________
a) Gate circuit
b) Time discriminators
c) Oscillators
d) None of the mentioned

Explanation: Circuit that produces on and off pulses are known as time discriminators. On and off pulses are used to measure time interval between two signals.

3. TDC devices are used for ________________
a) Indicating frequency of signal
b) Indicating time delay in analog format
c) Indicating time delay in digital format
d) Indicating voltage level

Explanation: Full form of TDC is time to digital converter, which indicates time delay value in digital format (binary).

4. Measuring range is not an important parameter in TIM.
a) True
b) False

Explanation: We have to consider the operating range of signal while measuring time using TIM(Time Interval Measurement) device.

5. When interpolation techniques are used?
a) For high range of measurement is required
b) For high resolution of measurement
c) For high range of measurement and high resolution of the measurement is required
d) Not the mentioned

Explanation: For both high resolution and high operating range, interpolation techniques can be employed. High operating range can be achieved using analog type and high resolution can be achieved using digital type.
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6. What is the use of PWM technology?
a) To amplify output voltage
b) To reduce output voltage
c) For controlling supply voltage
d) For measuring voltage

Explanation: Controlling supply voltage is one of the applications of PWM method. In PWM method signal is made on and off several times using suitable pulse waveform.

7. What do you mean by duty cycle?
a) Ratio of on time and total time period
b) Ratio of off time and total time period
c) On time
d) Off time

Explanation: Duty cycle of a system is the ratio of its on time and total time period (ton+toff).

8. Time require by the signal to reach 63% of amplitude is known as _____________
a) Duty cycle
b) Time delay
c) Time constant
d) On time

Explanation: Practically time constant is the time required by the signal to reach 63% of the maximum amplitude.

9. What is the use of a gate circuit in TIM?
a) To produce sinusoidal signal
b) To produce pulse signal
c) To on and off input signal
d) None of the mentioned

Explanation: Gate circuit is employed for making proper on and off of input signal. Two pulses, on pulse and off pulse are applied to the gate circuit.

10. TDC and TIM are used for the same application.
a) True
b) False

Explanation: TDC and TIM work for the same application. But the difference is that TDC used for measuring time delay in digital format.

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