Correct Answer:- Option-D
Question38:-A 250 V moving iron voltmeter takes a current of 0.05 A when connected to a 250 V DC supply. The coil has an
inductance of 1 H. Determine the percentage error when the meter is connected to a 250 V, 100 Hz AC supply.
A:-1%
B:-0.8%
C:-10%
D:-0.5%
Correct Answer:- Option-B
Question39:-Which of the following instrument is equally accurate in DC as well as AC circuits ?
A:-Dynamometer type watt meter
B:-Moving iron ammeter
C:-PMMC voltmeter
D:-Induction type watt meter
Correct Answer:- Option-A
Question40:-The scale of PMMC instrument is uniform because
A:-Of eddy current damping
B:-External magnetic fields have no effect
C:-It is spring controlled
D:-It has no hysteresis loss
Correct Answer:- Option-C
Question41:-The donor concentration of Si crystal is 1.9 x 107 (24) /'m*(3)° and the intrinsic concentration is 1.4 x
*10*(18)*/ m*(3)° . Estimate the concentration of holes
A:-1.0 x *10%(12)* ‘/m*(3)°
8:-1.0 > ` 10^(6)` `/71^(3)`
C:-0.7 x *10%(6)° */m*(3)*
D:-1.4 x *10*(12)° */m*(3)°
Correct Answer:- Option-A
Question42:-The Fermi level of intrinsic semiconductor is
A:-Above the conduction band
B:-Below the valance band
C:-Midway between conduction band and valance band
D:-None of the above
Correct Answer:- Option-C
Question43:-Diode in reverse bias is equivalent to
A:-Resistor of low resistance
B:-Resistor of high resistance
C:-Capacitor of high time constant
D:-Capacitor of low time constant
Correct Answer:- Option-B
Question44:-Give the relation between ‘alpha’ and* * ‘beta* of a transistor’ *
(beta)/(1-beta)*
(beta+1)/(beta)®
*(alpha+1)/(alpha)*
*(alpha)/(1-alpha)*
Correct Answer:- Option-D
Question45:-The diode that can be used as a voltage regulator is
A:-Photo Diode
B:-Zener Diode
C:-PIN Diode
D:-Varactor Diode
Correct Answer:- Option-B
Question46:-When the collector voltage in a NPN transistor increases, the effective base width decreases. This phenomenon
is called
A:-Schottky Effect
B:-Punch Through Effect
C:-Eber's Moll Effect
D:-Early Effect
Correct Answer:- Option-D
Question47:-Find the amplification factor of a JFET having drain resistance 39 KO and transconductance 3 mS
A:-13