**1.**An ammeter has a current range of 0 – 5 A, and its internal resistance is 0.2Ω . In order to change the range to 0 – 25 A, we need to add a resistance of

(A)0.8Ω in series with the meter (B) 1.0Ω in series with the meter

(C)0.04Ω in parallel with the meter (D) 0.05Ω in parallel with the meter

**2.**As shown in the figure, a negative feedback system has an amplifier of gain 100 with ±10% tolerance in the forward path, and an attenuator of value 9/100 in the feedback path. The overall system gain is approximately:

(A) 10±1%

(B) 10 ±2%

(C) 10 ±5%

(D) 10 ±10%

**3**.A three-phase, 33kV oil circuit breaker is rated 1200A, 2000MVA, 3s. The symmetrical breaking current is

(A) 1200 A (B) 3600 A (C) 35 kA (D) 104.8 kA

**4.**Assuming that the diodes in the given circuit are ideal, the voltage V 0 is

(A) 4V

(B) 5V

(C) 7.5V

(D) 12.12V

**5. **The fully controlled thyristor converter in the figure is fed from a single-phase source. When the firing angle is 0°, the dc output voltage of the converter is 300 V. What will be the output voltage for a firing angle of 60°, assuming continuous conduction?

(A) 150V

(B) 210V

(C) 300V

(D) 100πV

**6.**A box contains 4 white balls and 3 red balls. In succession, two balls are randomly selected and removed from the box. Given that the first removed ball is white, the probability that the second removed ball is red is

(A) 1/3 (B) 3/7 (C) 1/2 (D) 4/7

**7.**The armature resistance of the motor is,

(A)2Ω (B) 3.4Ω (C) 4.4Ω (D) 7.7Ω

**
8. **25 persons are in a room. 15 of them play hockey, 17 of them play football and 10 of them play both hockey and football. Then the number of persons playing neither hockey nor football is

(A) 2 (B) 17 (C)13 (D) 3

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