Engineering
ISBT Reasoning for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams
Q11. |
|
1) | 20s | 2) | 2s |
3) | 0.2s | 4) | 0.4s |
5) | None of these |
Answer : 0.4s

Q12. |
|
1) | K > – 2 | 2) | K > 0 |
3) | K > 1 | 4) | K > 1.45 |
Answer : K > 1.45

Q13. |
|
1) | Digital ramp ADC | 2) | Successive approximation ADC |
3) | Single-slope ADC | 4) | Counting ADC |
5) | None of these |
Answer : Single-slope ADC
Explanation : Single-slope ADC (analog to digital converter) does not use DAC (digital to analog converter).
Explanation : Single-slope ADC (analog to digital converter) does not use DAC (digital to analog converter).

Q14. |
|
1) | It is possible for the current to be oscillatory | 2) | The voltage across the resistor at t = 0+ is zero |
3) | The voltage across the resistor at t = 0 is zero | 4) | The resistor current eventually falls to zero |
5) | None of these |
Answer : The voltage across the resistor at t = 0+ is zero

Q15. |
|
1) | distributed network | 2) | lumped network |
3) | passive network | 4) | reactive network |
5) | None of these |
Answer : lumped network
Explanation :
Explanation :
Distributed Network - In distributed network resistors, capacitors and inductors can not be electrically separated and individually isolated as separate elements. Ex-Transmission line.
Lumped Network - Lumped network in which physically separate resistors, capacitors and inductors can be represented.
Passive Network - Passive network contains the circuit elements without any energy source.
Reactive Network - Reacitve network contains L and C.

Q16. |
|
1) | 0.025% | 2) | 0.25% |
3) | 2.05% | 4) | 20.5% |
Answer : 20.5%
Explanation :
Explanation :
+_ 0.5 % of reading = (0.5/100) x 0.1= +_ 0.0005V
+_2 digit = +_0.02V
Total possible error = +_0.0205 V
The % error = (0.0205 100 /0.01) x 100 = 20.5%

Q17. |
|
1) | 1 and 2 only | 2) | 1 and 3 only |
3) | 2 and 3 only | 4) | 1, 2 and 3 |
5) | None of these |
Answer : 1, 2 and 3
Explanation :
Explanation :
Vector voltmeter is an instrument which measure amplitude and phase of a signal. It uses two samplers to sample the two signals whose amplitude and relative phase are to be measured. It measures the voltages and phase difference at two different points to measure amplitude and phase difference. Vector voltmeter is used in the following measurements :
1. Complex insertion losses
2. Amplifier gain and phase shift
3. Filter transfer function
4. Complex impedance of mixers
5. ‘S’ parameters of transistors
6. Radio frequency distortions
7. Two-port network parameters
8. Amplitude modulation index.

Q18. |
|
1) | 1 and 2 only | 2) | 1 and 3 only |
3) | 2 and 3 only | 4) | 1, 2 and 3 |
5) | None of these |
Answer : 1 and 2 only
Explanation :
Explanation :
1. Metal conductors have more R at higher temperatures because of increased number of collisions between the free electrons and captive electrons.
2. Tungsten cannot be used as a resistance wire due to large variation of its resistance with increase in temperature.
3. Superconductive materials can conduct electricity or transport electrons from one atom to another with no resistance.

Q19. |
|
1) | 1, 2 and 3 | 2) | 1, 2 and 4 |
3) | 1, 3 and 4 | 4) | 2, 3 and 4 |
5) | None of these |
Answer : 1, 2 and 3
Explanation :
Explanation :
Null-type instruments are more accurate than the deflection-type. It is because the opposing effect is calibrated with the help of standards which have high degree of accuracy. But, in the deflection type instrument, accuracy is dependent upon their calibration which depends upon the instrument constants which have not very high accuracy.
Null-type instrument can be highly sensitive compared to deflection type because in null type instrument, the detector has to cover a small range around the null point. Further, the detector need not be calibrated since it has only to detect the presence and direction of unbalance and not the magnitude of unbalance.
Null-type instruments are less preferred than deflection-type instrument under dynamic
condition because null-type instruments equire many changes before reaching null condition. But deflection-type instruments can follow the variations of measurement more rapidly.

Q20. |
|
1) | 13% | 2) | 18% |
3) | 23% | 4) | 33% |
5) | None of these |
Answer : 13%
