For a tachometer,if θ(t) is the rotor displacement is radians,e(t) is the output voltage and Kt is the tachometer constant in V/rad/sec,then the transfer function,E(s)/Q(s) will be

1.  Kt s2

2.  Kt/s

3.  Kts

4.  Kt

View Answer  
4
Correct Answer :

Kts


Explanation :
No Explanation available for this question

A dc potentiometer is designed to measure up to about 2 V with a slide wire of 800 mm.A standard cell of emf 1.18 V obtains balance at 600 mm.A test cell is seen to obtain balance at 680 mm.The emf of the test cell is

1.  1.00 V

2.  1.34 V

3.  1.50 V

4.  1.70 V

View Answer  
4
Correct Answer :

1.34 V


Explanation :
No Explanation available for this question

The circuit in Figure, is used to measure the power consumed by the load. The current coil and the voltage coil of the wattmeter have 0.02 and 1000 ? resistances respectively. The measured power compared to the load power will be

1.  0.4% less

2.  0.2% less

3.  0.2% more

4.  0.4% more

View Answer  
4
Correct Answer :

0.2\% more


Explanation :
No Explanation available for this question

A galvanometer with a full scale current of 10 mA has a resistance of 1000 .The multiplying power (the ratio of measured current to galvanometer current) of a 100 ? shunt with this galvanometer is

1.  110

2.  100

3.  11

4.  10

View Answer  
4
Correct Answer :

11


Explanation :
No Explanation available for this question

A galvanometer with a full scale current of 10 mA has a resistance of 1000 .The multiplying power (the ratio of measured current to galvanometer current) of a 100 ? shunt with this galvanometer is

1.  110

2.  100

3.  11

4.  10

View Answer  
4
Correct Answer :

11


Explanation :
No Explanation available for this question

A bipolar junction transistor (BJT) is used as a power control switch by biasing it in the cut-off region (OFF state) or in the saturation region (ON state). In the ON state, for the BJT

1.  both the base-emitter and base-collector junctions are reverse biased

2.  the base-emitter junction is reverse biased, and the base-collector junction is forward biased

3.  the base-emitter junction is forward biased, and the base-collector junction is reverse biased

4.  both the ,base-emitter and base-collector junctions are forward biased

View Answer  
4
Correct Answer :

both the ,base-emitter and base-collector junctions are forward biased


Explanation :
No Explanation available for this question

The circuit in Figure shows a full-wave rectifier.The input voltage is 230 V (rms) single-phase ac.The peak reverse voltage across the diodes D1 and D2 is

1.  100 √2 V

2.  100 V

3.  50 √2 V

4.  50 V

View Answer  
4
Correct Answer :

100 √2 V


Explanation :
No Explanation available for this question

The triggering circuit of a thyristor is shown in Figure.The thyristor requires a gate current of 10 mA, for guaranteed turn-on.The value of R required for the thyristor to turn on reliably under all conditions of Vb variation is

1.  10000

2.  1600 ?

3.  1200 ?

4.  800 ?

View Answer  
4
Correct Answer :

1600 ?


Explanation :
No Explanation available for this question

The circuit in Figure shows a 3-phase half-wave rectifier.The source is a symmetrical,3-phase four-wire system.The line-to-line voltage of the source is 100 V.The supply frequency is 400 Hz.The ripple frequency at the output is

1.  400 Hz

2.  800 Hz

3.  1200 Hz

4.  2400 Hz

View Answer  
4
Correct Answer :

1200 Hz


Explanation :
No Explanation available for this question

The rms value of the periodic waveform given in Figure is

1.  2√6 A

2.  6√2 A

3.  √(4/3) A

4.  1.5 A

View Answer  
4
Correct Answer :

2√6 A


Explanation :
No Explanation available for this question
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