1. This question contains 15 sub-questions of multiple-choice type. Each sub-question has only one correct answer.

 

1.1. The transfer function of a passive circuit has its poles and zeroes on

(a) left and right halves respectively of the s-plane

(b) right and left halves respectively of the s-plane

(c) right half of the s-plane

(d) left half of the s-plane.

1.2. A first order system with a proportional controller in the negative feedback loop has an offset to a step input. This offset can be eliminated by

(a) adding a derivative mode to the controller

(b) adding an integral mode to the controller

(c) decreasing the magnitude of the gain of the proportional controller

(d) adding a delay in the controller loop.

 

1.3. Bootstrapping in a buffer amplifier circuit is used for

(a) increasing the input resistance

(b) reducing the power consumption

(c) decreasing the output resistance

(d) improving the frequency response.

1.4. A voltmeter has been connected between the input of a TTL inverting gate and ground. The gate is powered by 5 V. The voltmeter reading will be approximately

(a) 0 V (b) 2 V

(c) 4 V (d) 5 V

 

1.5. The advantage of a dual slope converter over successive approximation converter is that the dual slope converter

(a) is faster

(b) eliminates error due to drift

(c) can reduce the errors due to power supply

(d) does not require a stable voltage reference

 

1.6. The conversion time of an 8-bit successive approximation converter with a 1 MHz clock is nearly

(a) 512 m S (b) 256 m S

(c) 128 m S (d) 8 m S

1.7. The important feature of a micro controller is that it has an on-chip

(a) math co-processor

(b) program memory

(c) interface for I/O devices

(d) hardware multiplier.

 

1.8. The best size of the wire for measuring pitch diameters of ISO metric screw thread in terms of pitch, p, is

(a) p/2

(b)

(c) 3p/4

(d)

1.9. An elastic transducer is used to measure pressure in a vessel and it indicates a pressure of 3.2 bar. Atmospheric pressure is 1.01 bar. The absolute pressure in the vessel in bar is

(a) 1.01 (b) 2.19

(c) 3.20 (d) 4.21

 

1.10. A photo conductive transducer works on the principle that when a light beam strikes

 

(a) the material, its resistance decreases, which is sensed by an external circuit

(b) the barrier between transparent metal layer and a semi-conductor material, a voltage is generated

(c) the barrier between transparent metal layer and a semi-conductor material, a current is generated in the external circuit

(d) the cathode, it releases electrons, which are attracted towards anode, thereby producing electric current in the external circuit.

 

1.11. For alignment and testing of two surfaces at right angles, a constant deviation prism, also called an optical square, is used. It is a

(a) right angled prism (b) square prism

(c) pentagonal prism (d) hexagonal prism.

1.12. C 1 and C 2 are the activities of the ions on the two sides of a membrane. The Nernst potential developed across the membrane is proportional to

(a)

(b)

(c)

(d) exp (C 1/C 2) .

 

1.13. The bandwidth of an electrocardiogram (ECG) amplifier is

(a) dc to 0.01 Hz (b) 0.05 to 500 Hz

(e) 550 to 1500 Hz (d) 2000 to 10000 Hz.

1.14. Korotkoff sounds are used

(a) as a reference for sound level measurement

(b) for studying heart muscle functioning

(c) for blood pressure measurement

(d) for study of heart valve functioning

1.15 In an electromagnetic blood flow meter, the induced voltage is directly proportional to the

(a) blood flow rate

(b) square root of the blood flow rate.

(c) square of the blood flow rate

(d) logarithm of the blood flow rate