ISRO Scientist/Engineer ECE Solved Papers

The rotor current frequency in an induction motor operating at 50 Hz, with 4% slip is

In a chopper circuit, the thyristor is switched OFF at regular intervals by adopting

Wein-Bridge is commonly used for the measurement of

Q factor of a coil is given by

After firing a SCR, if the gate pulse is removed, then the current in the SCR

Which option replaces the question mark?

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You are a retail clerk who typically works Monday through Friday. You arrive at work and notice the new schedule is posted, and your manager has given you a Saturday shift. It happens to be your son's birthday on Saturday, and you have a party planned. What is the most appropriate response?

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Which of the following best completes the passage below?

In a survey of job applicants, two-fifths admitted to being at least a little dishonest. However, the survey may underestimate the proportion of job applicants who are dishonest, because ________?

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Eight friends P, Q, R, S, T, V, W and Y are sitting around a square table.

1. Out of eight, four persons are sitting at the corners of the table and the other four are sitting at the mid points of each side of the table.
2. Persons at the corners are facing the centre while the persons at the mid - points of side are facing outside.
3. S is third to the right of P. P is facing the centre.
4. Y is not sitting beside P or S.
5. T is third to the right of R.
6. R is not sitting at the mid - point of any side of the table.
7. R is also not beside Y.
8. There is only one person between P and V.
9. Q is not sitting beside V.

How many people are there between T and Q?

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Which option replaces the question mark?

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Which one will replace the question mark?

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Fact 1: Pictures can tell a story.

Fact 2: All storybooks have pictures.

Fact 3: Some storybooks have words.

If the first three statements are facts, which of the following statements must also be a fact?

I: Pictures can tell a story better than words can.

II: The stories in storybooks are very simple.

III: Some storybooks have both words and pictures.

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Statement: Exporters in the capital are alleging that commercial banks are violating a Reserve Bank of India directive to operate a post-shipment export credit denominated in foreign currency at international rates from January this year.

Courses of Action:

I. The officers concerned in the commercial banks are to be suspended.

II. The RBI should be asked to stop giving such directives to commercial banks.

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Find out the wrong number in the series.

7, 8, 18, 57, 228, 1165, 6996

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Directions : The graph given below represents the variations in earnings in rupees over a week. Study the graph and answer questions given below.

The difference in earnings was large between

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Study the following table carefully and answer the questions given below it:

What was the percentage (approximate) increase in production of D type of toys from 1983 to 1985?

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What is the maximum area of the rectangle with perimeter 620 mm?

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If a counter having 10 FFs is initially at 0, what count will it hold after 2060 pulses?

A memory system of size 16 K bytes is required to be designed using memory chips which have 12 address lines and 4 data lines each. Then the number of such chips required to design the memory system is

Consider the following program for 8085

XRA A
LXI B, 0007H
LOOP: DCX B
JNZ LOOP

The loop will be executed

A certain JK FF has $t_{pd}=12\text{ ns}$. The largest MOD counter that can be constructed from such FFs and still operate up to 10 MHz is

Convolution of $x(t+5)$ with impulse function $\delta(t-7)$ is equal to