Related Questions

A catalyst is said to be a negative catalyst, ifit
A Retards the rate of reaction
B Reduces the value of equilibrium constant
C Does not initiate the reaction
D All of the above
For the hydrogenation of oils (i) __________ is commonly used as catalyst and (ii) __________ is a catalyst poison.
A (i) platinum (ii) sulphur
B (i) palladium (ii) oxygen
C (i) nickel (ii) sulphur
D (i) nickel (ii) oxygen
Effectiveness factor (E) of a catalyst pellet is defined as, E = (actual rate within pore of catalyst/rate if notsnowed by pore diffusion) Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus)
A Tan hT/T
B Tan T/T
C Tan hT/tan T
D None of these
For a P-N diode, the number of minority carriers crossing the junction depends on
A Forward bias voltage
B Potential barrier
C Rate of thermal generation of electron hole pairs
D None of the above
Most of the majority carriers from the emitter ___________
A recombine in the base
B recombine in the emitter
C pass through the base region to the collector
D none of the above
Holes are the minority carriers in which type of semiconductor?
A Extrinsic
B Intrinsic
C n-type
D p-type
E None of the above
In a p-channel JFET, the charge carriers are ___________
A electrons
B holes
C both electrons and holes
D none of the above
In a npn transistor, ___________ are the minority carriers
A free electrons
B holes
C donor ions
D acceptor ions
In a pnp transistor, the current carriers are ___________
A acceptor ions
B donor ions
C free electrons
D holes
The majority charge carriers in p-type silicon are
A Free electrons
B ions
C conduction electrons
D holes

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