In a chopper circuit, the switching device is turned off at regular intervals by adopting

A)A combination of forced and natural commutation 
B)Forced commutation 
C)Either forced or natural commutation
D)Natural commutation

The positive swing of the output signal in a transistor circuit starts clipping when Q-point of the circuit moves towards the

A)Centre of the load line 
B)Centre of the supply lineS
C)Saturation point 
D)Cut-off point

If A = 5ax - 3ay + 5az and B = 3ax + ay then the magnitude of (2A - B) will be

A)18.07
B)10.07
C)22.07
D)14.07

The 8085 microprocessor responds to the presence of an interrupt

A)as soon as the TRAP pin becomes high 
B)by checking the TRAP pin for high status at the end of the execution of each instruction
C)by checking the TRAP pin for high status at regular intervals
D)by checking the TRAP pin for high status at the end of each instruction fetch

A full wave controlled rectifier with resistive load is supplied from 200 sin 100t (volts) mains. What will be the average output voltage if the SCRs are fired at 60 degree?

A)150V
B)300V
C)200V
D)95.5 V

Materials which are electrical insulators and in which an electric field can be sustained with a minimum dissipation of power can be named as

A)Magnetic materials 
B)Semi-conductors
C)Super conductors 
D)Dielectric materials 

The extremely high input impedance of a MOSFET is Primarily because of

(A) Absence of its channel
(B) Depletion of current carriers
(C) Extremely small leakage current of its gate capacitor
(D) Negative VGS